CN117528795A

CN117528795A - Channel estimation method, device and equipment

Info

Publication number: CN117528795A
Application number: CN202210897757.XA
Authority: CN
Inventors: 张仲丹
Original assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Current assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2024-02-06
Also published as: WO2024022498A1

Abstract

The application provides a channel estimation method, a device and equipment, wherein the method comprises the following steps: receiving first indication information, wherein the first indication information is used for indicating a physical downlink control channel PDCCH demodulation reference signal (DMRS) resource mapping type; according to PDCCH DMRS resource mapping types, N resource units are determined, wherein the N resource units are PDCCH DMRS mapped resource units, and N is a positive integer greater than or equal to 1; receiving signals on N resource units; and carrying out channel estimation on the new air interface NR PDCCH according to the signals received on the N resource units. In the method, the terminal equipment can determine the NR PDCCH channel estimation mode according to the first indication information, so that the channel estimation complexity of the terminal equipment is reduced.

Description

Channel estimation method, device and equipment

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a channel estimation method, apparatus, and device.

Background

Dynamic spectrum sharing (dynamic spectrum sharing, DSS) technology allows long term evolution (longterm evolution, LTE) and New Radio (NR) to dynamically share the same spectrum.

In DSS technology, NR physical downlink control channel (Physical downlink control channel, PDCCH) demodulation reference signals (Demodultion Reference Signal, DMRS) may share the same spectrum as LTE Cell-specific reference signals (Cell-specific Reference Signal, CRS).

Therefore, the research on the NR PDCCH channel estimation is aimed at reducing the complexity of the channel estimation of the terminal equipment, and has important practical significance for improving the communication performance of the NR PDCCH.

Disclosure of Invention

The application provides a channel estimation method, a device and equipment, which reduce the channel estimation complexity of terminal equipment.

In a first aspect, the present application provides a channel estimation method, including:

receiving first indication information, wherein the first indication information is used for indicating a Physical Downlink Control Channel (PDCCH) demodulation reference signal (DMRS) resource mapping type;

according to the PDCCH DMRS resource mapping type, N resource units are determined, wherein the N resource units are PDCCH DMRS mapped resource units, and N is a positive integer greater than or equal to 1;

receiving signals on the N resource units;

and carrying out channel estimation on the new air interface NR PDCCH according to the signals received on the N resource units.

In a possible implementation manner, the time domain resource of the NR PDCCH includes a first symbol and a second symbol;

the N resource units include M resource units corresponding to the first symbol and M resource units corresponding to the second symbol, where n=2m, and M is a positive integer;

Wherein K resource elements of M resource elements corresponding to the first symbol overlap with a resource element to which a long term evolution LTE cell specific reference signal CRS is mapped; and K is a positive integer.

In a possible implementation manner, the channel estimation on the NR PDCCH according to the signals received on the N resource units includes:

performing channel estimation on an NR PDCCH according to LTE CRSs received on the K resource units and PDCCH DMRS received on other resource units except the K resource units in the N resource units; or,

and performing channel estimation on the NR PDCCH according to PDCCH DMRS received on M resource units corresponding to the second symbol.

the N resource elements correspond to the second symbol, and the resource element corresponding to the first symbol includes a resource element mapped to by LTE CRS.

In a possible implementation manner, the resource unit corresponding to the second symbol does not include a resource unit mapped to by the LTE CRS.

In a possible implementation manner, the method further includes:

And receiving second indication information, wherein the second indication information is used for indicating the resource unit for channel estimation in the resource units mapped to by the PDCCH DMRS.

In a possible implementation manner, the PDCCH DMRS resource mapping type is associated with a resource unit used for channel estimation in the resource units mapped to by the PDCCH DMRS.

In a second aspect, the present application provides a channel estimation method, including:

determining PDCCH DMRS a resource mapping type;

sending first indication information to terminal equipment, wherein the first indication information is used for indicating PDCCH DMRS resource mapping types; the PDCCH DMRS resource mapping type is used to determine the resource unit to which PDCCH DMRS is mapped.

In a possible implementation manner, the method further includes:

and sending second indication information, wherein the second indication information is used for indicating the resource unit for channel estimation in the resource units mapped to by the PDCCH DMRS.

In a third aspect, the present application provides a channel estimation apparatus, including: a receiving module, a determining module and an estimating module, wherein,

The receiving module is configured to receive first indication information, where the first indication information is used to indicate PDCCH DMRS resource mapping types;

the determining module is configured to determine N resource units according to the PDCCH DMRS resource mapping type, where the N resource units are resource units mapped to by PDCCH DMRS, and N is a positive integer greater than or equal to 1;

the receiving module is further configured to receive signals on the N resource units;

the estimation module is configured to perform channel estimation on the NR PDCCH according to signals received on the N resource elements.

In one possible implementation, the time domain resource of the NR PDCCH includes a first symbol and a second symbol;

wherein K resource units in M resource units corresponding to the first symbol overlap with a resource unit mapped to the LTE CRS; and K is a positive integer.

In a possible implementation manner, the estimation module is specifically configured to:

In one possible implementation, the resource elements corresponding to the second symbol do not include resource elements to which LTE CRS is mapped.

In a possible implementation manner, the receiving module is specifically configured to:

In a possible implementation, the PDCCH DMRS resource mapping type is associated with a resource unit for channel estimation among the resource units mapped to by the PDCCH DMRS.

In a fourth aspect, the present application provides a channel estimation apparatus, including: a determining module and a transmitting module, wherein,

the determining module is configured to determine a resource mapping type of PDCCH DMRS;

the sending module is used for sending first indication information to the terminal equipment, wherein the first indication information is used for indicating PDCCH DMRS resource mapping types; the PDCCH DMRS resource mapping type is used to determine the resource unit to which PDCCH DMRS is mapped.

In one possible implementation manner, the sending module is specifically configured to:

In a fifth aspect, the present application provides a channel estimation apparatus, comprising: a processor, and a memory communicatively coupled to the processor;

the memory stores a computer program;

the processor executes the computer program to implement the method according to any of the first aspects.

In a sixth aspect, the present application provides a channel estimation apparatus, including: a processor, and a memory communicatively coupled to the processor;

the memory stores a computer program;

the processor executes the computer program to implement the method of any of the second aspects.

In a seventh aspect, the present application provides a computer readable storage medium having stored therein a computer program which when executed by a computer implements the method according to any of the first aspects.

In an eighth aspect, the present application provides a computer readable storage medium having stored therein a computer program which when executed by a computer implements the method according to any of the second aspects.

In a ninth aspect, the present application provides a computer program product comprising a computer program which, when executed by a computer, implements the method according to any one of the first aspects.

In a tenth aspect, the present application provides a computer program product comprising a computer program which, when executed by a computer, implements the method according to any of the second aspects.

In an eleventh aspect, the present application provides a chip having a computer program stored thereon, which, when executed by the chip, implements the method according to any of the first aspects. The chip can also be a chip module.

In a twelfth aspect, the present application provides a chip having a computer program stored thereon, which, when executed by the chip, implements the method according to any of the second aspects. The chip can also be a chip module.

According to the channel estimation method, the device and the equipment provided by the application, the terminal equipment can determine N resource units corresponding to the PDCCH DMRS resource mapping type according to the PDCCH DMRS resource mapping type indicated by the first indication information, and can perform channel estimation on the NR PDCCH according to PDCCH DMRS received on the N resource units. That is, the terminal device may determine a channel estimation manner through the first indication information, thereby reducing channel estimation complexity of the terminal device.

Drawings

Fig. 1 is a schematic diagram of LTE CRS resource mapping provided in an embodiment of the present application;

fig. 2 is a schematic diagram of LTE and NR dynamic spectrum sharing provided in an embodiment of the present application;

fig. 3 is a schematic diagram of NR PDCCH DMRS resource mapping according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a NR PDCCH DMRS resource map based on DSS technology;

FIG. 5 is a schematic diagram of another NR PDCCH DMRS resource map based on DSS technology;

fig. 6 is a schematic diagram of a communication system architecture according to an embodiment of the present application;

fig. 7 is a flow chart of a channel estimation method according to an embodiment of the present application;

fig. 8 is a flowchart of another channel estimation method according to an embodiment of the present application;

fig. 9 is a schematic diagram of a resource mapping type according to an embodiment of the present application;

fig. 10 is a flowchart of another channel estimation method according to an embodiment of the present application;

FIG. 11 is a schematic diagram of yet another NR PDCCH DMRS resource map based on DSS technology;

FIG. 12 is a schematic diagram of yet another NR PDCCH DMRS resource map based on DSS technology;

fig. 13 is a schematic structural diagram of a channel estimation device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of another channel estimation device according to an embodiment of the present application;

Fig. 15 is a schematic hardware structure of a channel estimation device provided in the present application;

fig. 16 is a schematic hardware structure of another channel estimation device provided in the present application.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The present application relates to communication technologies, and in order to facilitate understanding of embodiments of the present application, first, a detailed description will be given of related communication technologies related to the present application.

1) LTE Cell-specific reference signal (Cell-specific Reference Signal, CRS) resource mapping:

as shown in fig. 1, fig. 1 is a schematic diagram of LTE CRS resource mapping provided in an embodiment of the present application. Referring to fig. 1, each CRS occupies one Resource Element (RE). The CRS is transmitted on every downlink subframe, every Resource Block (RB) within the entire downlink bandwidth. The starting position of the CRS within each RB is related to the cell-specific frequency offset (frequency shift).

A cell may use 1 CRS, 2 CRSs, or 4 CRSs. Where LTE cells use 1 CRS, 1 antenna port (e.g., antenna port 0) may be used; when 2 CRSs are used by an LTE cell, 2 antenna ports (e.g., antenna port 0 and antenna port 1) may be used; when 4 CRSs are used by the LTE cell, 4 antenna ports (e.g., antenna port 0, antenna port 1, antenna port 2, and antenna port 3) may be used.

When 1 CRS is used by a cell, the CRS may be inserted into the 1 st orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol and the 3 rd to last OFDM symbol of each slot. Adjacent 2 CRSs within the same OFDM symbol are spaced 6 subcarriers apart in the frequency domain. Meanwhile, the CRS in the 3 rd OFDM symbol and the CRS in the 1 st OFDM symbol are spaced 3 subcarriers apart in the frequency domain.

When 2 CRSs are used by the cell, the 1 st antenna port (antenna port 0) CRS is multiplexed with the CRS on the 2 nd antenna port (antenna port 1) in the frequency domain, both of which are offset by 3 subcarriers in the frequency domain.

When the cell uses 4 CRSs, the CRS on the 3 rd antenna port (antenna port 2) and the reference signal on the 4 th antenna port (antenna port 3) are multiplexed on the frequency domain, both of which are offset by 3 subcarriers on the frequency domain. CRS on the 3 rd and 4 th antenna ports are transmitted on the 2 nd OFDM symbol of each slot. The 3 rd and 4 th antenna ports are thus time-domain multiplexed with the reference signals on the 1 st and 2 nd antenna ports.

2)DSS：

DSS refers to a technique where NR and LTE dynamically share the same segment of spectrum.

As shown in fig. 2, fig. 2 is a schematic diagram of LTE and NR dynamic spectrum sharing provided in an embodiment of the present application. Referring to fig. 2, lte and NR dynamically share one frequency band. Illustratively, in the time domain dimension, DSS supports instantaneous sharing with a period of 1ms, i.e. coordinated scheduling of spectrum resources every 1 ms. In the frequency domain dimension, the DSS supports dynamic sharing with granularity of 1RB, and dynamic resource allocation is carried out according to traffic demands of the LTE side and the NR side.

3) PDCCH DMRS resource mapping:

as shown in fig. 3, fig. 3 is a schematic diagram of PDCCH DMRS resource mapping according to an embodiment of the present application. Referring to fig. 3, the pdcch resource allocation basic unit may be a resource element group (Resource Element Group, REG). REG may be defined by one OFDM symbol in the time domain, and 12 subcarriers (i.e., 1 RB) in the frequency domain.

PDCCH DMRS, which may be referred to as NR PDCCH DMRS, is a reference signal for demodulating the NR PDCCH. For example, 3 REs for mapping PDCCH DMRS are uniformly distributed in each REG to which the NR PDCCH is mapped, and the 3 REs may be REs corresponding to subcarrier 1, subcarrier 5, and subcarrier 9 in the REG.

In DSS technology, there are a number of different situations when the network device maps NR PDCCHs and PDCCH DMRS, and an exemplary transmission scheme of NR PDCCHs and PDCCH DMRS is described below with reference to fig. 4-5.

Taking LTE CRS port number of 4 and cell-specific frequency offset of 0 as an example. One possible transmission scheme is shown in fig. 4, and fig. 4 is a schematic diagram of a NR PDCCH DMRS resource mapping based on DSS technology. Referring to fig. 4, the frequency domain positions of lte CRSs are subcarrier 0, subcarrier 3, subcarrier 6, and subcarrier 9.NR PDCCH is transmitted on symbol 1 and symbol 2.

LTE CRS may be transmitted simultaneously on symbol 1. On REs with LTE CRS, the network device may drop NR PDCCH and PDCCH DMRS. That is, if LTE CRS overlaps with NR PDCCH or PDCCH DMRS, the network device may drop NR PDCCH and PDCCH DMRS on the overlapping REs. For example, the PDCCH DMRS is transmitted on subcarrier 1 and subcarrier 5 of symbol 1; the PDCCH DMRS and LTE CRS overlap on subcarrier 9, and the network equipment is knocked out PDCCH DMRS; on subcarrier 0, subcarrier 3 and subcarrier 6, the NR PDCCH overlaps with the LTE CRS, and the network device drops the NR PDCCH.

Symbol 2 is not used for transmitting LTE CRS. Subcarrier 1, subcarrier 5 and subcarrier 9 of symbol 2 are used for transmission PDCCH DMRS. NR PDCCH is transmitted on the remaining subcarriers of symbol 2.

Taking LTE CRS with a number of ports of 4 and a cell-specific frequency offset of 0 as an example, another possible transmission method is shown in fig. 5, and fig. 5 is another schematic diagram of NR PDCCH DMRS resource mapping based on DSS technology. Referring to fig. 5, the frequency domain positions of lte CRSs are subcarrier 0, subcarrier 3, subcarrier 6, and subcarrier 9.NR PDCCH is transmitted on symbol 1 and symbol 2.

LTE CRS may be transmitted simultaneously on symbol 1. On the symbol with LTE CRS, the network device transmits only NR PDCCH, and does not transmit PDCCH DMRS. On REs with LTE CRS, the network device may drop the NR PDCCH. For example, NRPDCCH and LTE CRS on subcarrier 0, subcarrier 3, subcarrier 6 and subcarrier 9 of symbol 1 overlap, and the network device knocks out the NR PDCCH; NR PDCCH is transmitted on the remaining subcarriers of symbol 1.

Fig. 6 is a schematic diagram of a communication system architecture according to an embodiment of the present application, as shown in fig. 6. Referring to fig. 6, the communication system includes: network equipment and terminal equipment.

In the above communication system architecture, the network device may be a next generation base station (next generation node B, gNB), and the network device supports DSS technology between NR and LTE.

The terminal device may communicate with the network device based on the NR. For example, the terminal device may receive the NR PDCCH transmitted by the network device and may perform NR PDCCH channel estimation through PDCCH DMRS. It should be understood that the number of terminal devices may be one or more, which is not limited to the embodiments of the present application.

It should be noted that, the system architecture described in the embodiments of the present application is for more clearly describing the technical solution of the embodiments of the present application, and does not constitute a limitation to the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, with evolution of the network architecture and occurrence of new service scenarios, the technical solution provided in the embodiments of the present application is applicable to similar problems.

Next, a channel estimation method of the terminal device in the related art will be described in detail.

As described in fig. 4-5, there are a number of different situations when a network device transmits PDCCH DMRS. For different situations of network device transmission PDCCH DMRS, the terminal device can perform channel estimation at least in the following 3 ways:

mode 1: the terminal device performs channel estimation using PDCCH DMRS on all symbols mapped to the NRPDCCH.

Mode 2: the terminal device performs channel estimation using PDCCH DMRS on symbols mapped only to NR PDCCHs and PDCCH DMRS, that is, using PDCCH DMRS on REs corresponding to symbols not mapped to LTE CRS.

Mode 3: aiming at symbols with LTE CRS, the terminal equipment adopts PDCCH DMRS on the useful RE to perform channel estimation; for symbols mapping only NR PDCCH and PDCCH DMRS, the terminal device uses PDCCH DMRS on the symbols for channel estimation. Useful REs herein can be understood as: PDCCH DMRS and do not overlap or collide with REs occupied by LTE CRS.

When the terminal equipment performs channel estimation on the NR PDCCH, different PDCCH DMRS processes are required according to different LTE CRS resource mapping forms. For example, the terminal device needs to determine the location of the LTE CRS according to the frequency offset of the LTE CRS, the number of antenna ports, the bandwidth, the carrier frequency, and the like. The channel estimation of the terminal device is more complex.

In view of this, in the embodiments of the present application, the indication information is sent to the terminal device by the network device, so that the terminal device may determine the channel estimation mode according to the indication information, thereby reducing the channel estimation complexity of the terminal device.

The technical scheme of the present application is described in detail below with specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.

Fig. 7 is a flow chart of a channel estimation method according to an embodiment of the present application. As shown in fig. 7, the method of the present embodiment includes:

s701, the network device determines a resource mapping type of PDCCH DMRS.

The network device may be a gNB in a fifth generation mobile communication technology (5G) NR system.

PDCCH DMRS is a reference signal for demodulating the NR PDCCH, PDCCH DMRS may be used for channel estimation of the NR PDCCH.

PDCCH DMRS resource mapping may be an allocation of PDCCH DMRS transmission resources performed by a network device.

PDCCH DMRS resource mapping type may also be referred to as PDCCH DMRS resource mapping manner, etc. For example, the PDCCH DMRS resource mapping type is used to indicate PDCCH DMRS a mapping situation of a resource element corresponding to a symbol where the LTE CRS is located. For example, the PDCCH DMRS resource mapping manner may be used to indicate that PDCCH DMRS is not mapped on a resource element corresponding to a symbol where the LTE CRS is located. Alternatively, the PDCCH DMRS resource mapping manner may be used to indicate mapping PDCCH DMRS on the resource element corresponding to the symbol where the LTE CRS is located.

It should be understood that the network device may determine a PDCCH DMRS resource mapping manner according to information such as available resources in the time-frequency domain.

S702, the network equipment sends first indication information to the terminal equipment.

Correspondingly, the terminal device receives the first indication information from the network device.

The terminal device may be an electronic device supporting an NR network system. For example, the terminal device may be a vehicle, an in-vehicle terminal, or an in-vehicle device supporting an NR network system, or may be a user terminal, a mobile device, or an edge device, or may be a road side device.

The first indication information is used to indicate PDCCH DMRS a resource mapping type.

The first indication information includes, but is not limited to, a system information broadcast (System Information Block, SIB), terminal equipment specific (UE-specific) signaling, or other system message. The embodiment of the application does not limit the specific form of the first indication information. For example, the terminal device specific signaling may be PDCCH configuration (PDCCH-config) signaling.

In a possible implementation manner, the first indication information may also be used to indicate a channel estimation manner.

The network device may determine a channel estimation manner according to the PDCCH DMRS resource mapping type, and send the channel estimation manner to the terminal device through the first indication information.

The channel estimation method may be that channel estimation is performed through PDCCH DMRS on all symbols mapped with NR PDCCH; alternatively, the channel estimation method may be to perform channel estimation by PDCCH DMRS on symbols to which LTE CRS is not mapped.

Specifically, the first indication information may include a value of a preset bit. The preset bit may take a first value or a second value. When the preset bit value is a first value (for example, the first value may be 0), the channel estimation mode may be that channel estimation is performed through PDCCH DMRS on all symbols mapped with the NR PDCCH; when the preset bit has a second value (for example, the second value may be 1), the channel estimation method may be to perform channel estimation by PDCCH DMRS on the symbol that is not mapped to the LTE CRS. Or,

the first indication information may include a state of a preset parameter. The state of the preset parameter may be an enabled (enabled) state or a disabled (disabled) state. When the state of the preset parameter is the starting state, the channel estimation mode may be that the channel estimation is performed through PDCCH DMRS on the symbol that is not mapped with the LTE CRS; when the state of the preset parameter is the disabled state, the channel estimation mode may be that channel estimation is performed through PDCCH DMRS on all symbols mapped with the NR PDCCH.

In one possible implementation, the PDCCH DMRS resource mapping type is associated with a resource unit for channel estimation among the resource units mapped to PDCCH DMRS.

The resource unit may be a basic resource unit of the transmission PDCCH DMRS, e.g., the resource unit may be an RE. That is, communication between the terminal device and the network device may be performed with the granularity of resource units. For example, the network device may transmit PDCCH DMRS on one or more resource units. Alternatively, the terminal device may receive PDCCH DMRS on one or more resource units.

Specifically, for any one PDCCH DMRS resource mapping type, when the network device adopts the resource mapping type, the terminal device may perform channel estimation by using PDCCH DMRS and LTE CRS transmitted on all resource units mapped to by PDCCH DMRS, or the terminal device may perform channel estimation by using PDCCH DMRS transmitted on part of resource units mapped to by PDCCH DMRS. That is, any one PDCCH DMRS resource mapping type may correspond to one or more channel estimation manners.

In a possible implementation manner, the network device may further send second indication information to the terminal device.

The second indication information is used to indicate a resource unit for channel estimation among the resource units to which PDCCH DMRS is mapped.

The second indication information includes, but is not limited to, a system information broadcast or other system message. The embodiment of the application does not limit the specific form of the second indication information.

Specifically, the network device may instruct the terminal device to perform channel estimation according to PDCCH DMRS received on the specified one or more symbols according to the PDCCH DMRS resource mapping situation and the interference situation of the LTE CRS on the NR PDCCH/PDCCH DMRS. For example, when the LTE CRS does not severely interfere with the NR PDCCH/PDCCH DMRS, the network device may instruct the terminal device to perform channel estimation by using PDCCH DMRS on all symbols mapped to the NR PDCCH through the second indication information; when the LTE CRS severely interferes with the NR PDCCH/PDCCH DMRS, the network device may instruct the terminal device to perform channel estimation by using PDCCH DMRS mapping only the symbols of the NR PDCCH and PDCCH DMRS through the second indication information, that is, performing channel estimation by using PDCCH DMRS not mapping on REs corresponding to the symbols of the LTE CRS.

Illustratively, assume that the symbols corresponding to the resource units to which PDCCH DMRS is mapped are symbol 1 and symbol 2. LTE CRS may also be transmitted on symbol 1. Symbol 2 is used only for transmission of NR PDCCH/PDCCH DMRS. When the LTE CRS does not severely interfere with the NR PDCCH/PDCCH DMRS, the network device may instruct the terminal device to perform channel estimation using PDCCH DMRS transmitted on symbol 1 and symbol 2 through the second indication information. When the LTE CRS has serious interference to the NR PDCCH/PDCCH DMRS, the network equipment can instruct the terminal equipment to perform channel estimation by adopting PDCCH DMRS transmitted on the symbol 2 through the second instruction information.

S703, the terminal equipment determines N resource units according to the PDCCH DMRS resource mapping type.

N resource units are the resource units to which PDCCH DMRS is mapped, and N is a positive integer greater than or equal to 1.

The resource unit referred to in the embodiments of the present application may be a basic resource unit of transmission PDCCH DMRS, for example, the resource unit may be an RE.

The terminal device may determine N resource units corresponding to the PDCCH DMRS resource mapping type according to the PDCCH DMRS resource mapping type indicated by the first indication information. The N resource elements may be located on one symbol or the N resource elements may be located on at least two symbols. For example, some of the N resource elements are located on one symbol and some are located on another symbol.

Illustratively, two symbols are shown as examples to which NR PDCCH is mapped. One symbol has LTE CRS and the other symbol has no LTE CRS. If the PDCCH DMRS resource mapping type indicated by the first indication information is: the network device transmits PDCCH DMRS only on symbols without LTE CRS, then the N resource elements to which PDCCH DMRS is mapped are located on the same symbol. If the PDCCH DMRS resource mapping type indicated by the first indication information is: the network device transmits PDCCH DMRS on all symbols to which the NR PDCCH maps, then the N resource elements to which PDCCH DMRS maps are located on different symbols.

S704, the terminal equipment receives signals on N resource units.

The signals may include PDCCH DMRS, or the signals may include PDCCH DMRS and LTE CRS, for example.

After determining N resource units according to the resource mapping manner, the terminal device may receive PDCCH DMRS from the N resource units, or may receive PDCCH DMRS and LTE CRS from the N resource units.

It should be noted that, when the PDCCH DMRS resource mapping manner indicates that PDCCH DMRS is mapped on the resource element corresponding to the symbol where the LTE CRS is located, the network device may transmit PDCCH DMRS in at least the following 3 manners. Correspondingly, when the network device adopts different modes to transmit PDCCH DMRS, the signals received by the terminal device are different.

Mode 1: the PDCCH/PDCCH DMRS is knocked out (puncture).

In this manner, for a resource unit where LTE CRS overlaps PDCCH, the network device may discard the PDCCH on the resource unit; for a resource element where LTE CRS overlaps PDCCH DMRS, the network device may discard PDCCH DMRS on that resource element.

Correspondingly, the terminal equipment receives the LTE CRS as a signal in a resource unit where the LTE CRS and the PDCCH overlap; and the terminal equipment is in a resource unit with overlapped LTE CRS and PDCCH DMRS, and the received signal is LTE CRS.

Mode 2: overlapping transmissions (superpositions).

In this manner, the NR network device may send PDCCH and PDCCH DMRS; the LTE network device may transmit LTE CRS.

Correspondingly, the terminal equipment receives signals of LTE CRS and PDCCH in resource units where LTE CRS and PDCCH overlap; and the terminal equipment receives signals of LTE CRS and PDCCH DMRS in resource units where LTE CRS and PDCCH DMRS overlap.

Mode 3: LTE CRS on antenna port 2 (port 2) and antenna port 3 (port 3) are knocked out (functure).

In this manner, the network device may discard LTE CRS on antenna port 2 and antenna port 3, i.e., no LTE CRS is transmitted on symbol 1.

Correspondingly, the terminal equipment receives the PDCCH as a signal on a resource unit where the LTE CRS and the PDCCH overlap; the terminal device receives PDCCH DMRS signals on the resource units where LTE CRS and PDCCH DMRS overlap.

S705, the terminal equipment carries out channel estimation on the NR PDCCH according to the signals received on the N resource units.

The channel estimation may be a process of estimating characteristic parameters of a channel used for transmitting a signal. For example, the characteristic parameters of the channel may be channel coefficients, channel noise, and the like.

In this embodiment of the present application, the terminal device may perform channel estimation on the NR PDCCH according to all PDCCH DMRS or part PDCCH DMRS received.

For example, assume that symbols corresponding to resource elements mapped to by NR PDCCH are symbol 1 and symbol 2; symbol 1 is used simultaneously to map LTE CRS.

If the PDCCH DMRS resource mapping manner indicates that PDCCH DMRS is not mapped on the resource unit corresponding to the symbol where the LTE CRS is located, the terminal device may perform NR PDCCH channel estimation according to all PDCCH DMRS received on symbol 2.

If the PDCCH DMRS resource mapping manner indicates that PDCCH DMRS is mapped on the resource element corresponding to the symbol where the LTE CRS is located, the terminal device may perform NR PDCCH channel estimation according to all PDCCH DMRS received on symbol 1 and symbol 2, or the terminal device may perform NR PDCCH channel estimation according to the portion PDCCH DMRS received on symbol 2.

In the channel estimation method provided in this embodiment, the terminal device may determine N resource units corresponding to the PDCCH DMRS resource mapping type according to the PDCCH DMRS resource mapping type indicated by the first indication information, and may perform channel estimation on the NR PDCCH according to PDCCH DMRS received on the N resource units. That is, the terminal device may determine a channel estimation manner through the first indication information, thereby reducing channel estimation complexity of the terminal device.

Based on the embodiment of fig. 7, the resource mapping indicated by the first indication information PDCCH DMRS includes at least the following 2 cases:

case 1: the N resource units to which PDCCH DMRS resources are mapped are on 2 symbols.

Case 2: the N resource units to which PDCCH DMRS resources are mapped are on 1 symbol.

Next, the case 1 will be described with reference to fig. 8.

Fig. 8 is a flowchart of another channel estimation method according to an embodiment of the present application. As shown in fig. 8, the method of the present embodiment includes:

s801, the terminal equipment receives first indication information.

The implementation of S801 may be described in detail in S702, which is not described here.

S802, the terminal equipment determines N resource units on the first symbol and the second symbol according to the PDCCH DMRS resource mapping type.

In this embodiment, the resource mapping type of PDCCH DMRS may be: the time domain resource of the NR PDCCH comprises a first symbol and a second symbol; the N resource units include M resource units corresponding to the first symbol and M resource units corresponding to the second symbol, n=2m, and M is a positive integer; wherein K resource units in M resource units corresponding to the first symbol overlap with a resource unit mapped to the LTE CRS; k is a positive integer.

The terminal device may determine N resource units on the first symbol and the second symbol according to the resource mapping type of PDCCH DMRS.

Specifically, in the first symbol and the second symbol used for transmitting the NR PDCCH, the NR PDCCH on the second symbol does not overlap with the LTE CRS, and M resource elements in the second symbol are mapped with PDCCH DMRS. The NR PDCCH overlaps the LTE CRS on the first symbol, and M resource elements in the first symbol are mapped with PDCCH DMRS, but K of the M resource elements are also mapped with the LTE CRS. At this time, the terminal device may determine that the N resource elements are M resource elements on the first symbol and M resource elements on the second symbol.

Exemplary, as shown in fig. 9, fig. 9 is a schematic diagram of a resource mapping type according to an embodiment of the present application. As shown in fig. 9, taking an example that the aggregation level of the PDCCH is 1 (i.e., the PDCCH is composed of one control channel element (Control Channel Element, CCE)), the CCE may include REG0, REG1 … … REG5. Each REG occupies 12 subcarriers in the frequency domain and 1 symbol in the time domain. REG0, REG2, and REG4 may occupy the same symbol in the time domain. REG1, REG3, and REG5 may occupy the same symbol in the time domain. Taking REG0 occupies symbol 1 and REG1 occupies symbol 2 as an example.

The NR PDCCH on symbol 2 does not overlap with the LTE CRS. The NR PDCCH overlaps the LTE CRS on symbol 1. The resource elements mapped with PDCCH DMRS in symbol 2 are subcarrier 1, subcarrier 5 and subcarrier 9, respectively. The resource elements mapped with PDCCH DMRS in symbol 1 are also subcarrier 1, subcarrier 5 and subcarrier 9, respectively, while subcarrier 1 in symbol 1 is also mapped with LTE CRS. Then the number of resource elements of mapping PDCCH DMRS in REG0 is 3 and the number of resource elements of mapping PDCCH DMRS in REG1 is 3; the number of resource elements of PDCCH DMRS and LTE CRS is 1 in REG0 and REG1 simultaneously mapped. Similarly, N in PDCCH may be determined to be 18, m is 9,K to be 3.

S803, the terminal equipment receives signals on the determined N resource units.

In this embodiment, only PDCCH DMRS are mapped to M resource elements on the second symbol. The PDCCH DMRS and LTE CRSs are mapped to K resource elements out of M resource elements on the first symbol, and only PDCCH DMRS are mapped to the remaining resource elements excluding the K resource elements out of the M resource elements.

The terminal device may receive PDCCH DMRS on M resource elements on the first symbol and M resource elements on the second symbol.

It should be noted that, when the network device adopts different PDCCH DMRS resource transmission modes, the signals received by the terminal device are different, and the network device can at least adopt the following 3 modes to transmit PDCCH DMRS:

Mode 1: the PDCCH/PDCCH DMRS is knocked out (puncture).

Mode 2: overlapping transmissions (superpositions).

S804, the terminal equipment carries out channel estimation on the NR PDCCH according to the signals received on the N resource units.

In this embodiment, the terminal device may perform channel estimation on the NR PDCCH according to the LTE CRS received on the K resource elements and PDCCH DMRS received on other resource elements except for the K resource elements in the N resource elements; alternatively, the NR PDCCH is channel estimated based on PDCCH DMRS received on M resource elements corresponding to the second symbol.

Specifically, the terminal device may perform NR PDCCH channel estimation based on all PDCCH DMRS received on the N resource elements, or the terminal device may perform NR PDCCH channel estimation based on PDCCH DMRS received on the M resource elements on the second symbol.

For example, referring to fig. 9, taking REG0 and REG1 as examples, REG0 occupies symbol 1 and REG1 occupies symbol 2. The terminal device receives PDCCH DMRS on subcarrier 1, subcarrier 5 and subcarrier 9 of symbol 1 and subcarrier 1, subcarrier 5 and subcarrier 9 of symbol 2. Meanwhile, the sub-carriers of symbol 1 are also used for transmitting LTE CRS. In this case, the terminal device may perform channel estimation according to the subcarrier 1, subcarrier 5, and subcarrier 9 of the symbol 1, and the subcarrier 1, subcarrier 5, and subcarrier 9 of the symbol 2, which are received PDCCH DMRS; alternatively, the terminal device may perform channel estimation based on the received PDCCH DMRS on subcarrier 1, subcarrier 5 and subcarrier 9 of symbol 2.

In the channel estimation method provided in this embodiment, the terminal device may determine N resource units mapped to PDCCH DMRS on the first symbol and the second symbol according to the mapping type of PDCCH DMRS, and may perform NR PDCCH channel estimation according to PDCCH DMRS received on the N resource units, or perform NR PDCCH channel estimation according to PDCCH DMRS received on M resource units on the second symbol, thereby reducing channel estimation complexity of the terminal device.

Next, the case 2 will be described with reference to fig. 10.

Fig. 10 is a flowchart of another channel estimation method according to an embodiment of the present application. As shown in fig. 10, the method of the present embodiment includes:

s1001, the terminal equipment receives the first indication information.

The implementation of S1001 may be described in detail in S702, which is not described herein.

S1002, the terminal equipment determines N resource units on the second symbol according to the PDCCH DMRS resource mapping type.

In this embodiment, the resource mapping type of PDCCH DMRS may be: the time domain resource of the NR PDCCH comprises a first symbol and a second symbol; the N resource elements correspond to the second symbol, and the resource element corresponding to the first symbol includes a resource element mapped to the LTE CRS. The resource units corresponding to the second symbol do not include resource units to which LTE CRSs are mapped.

Specifically, of the first symbol and the second symbol used for transmitting the NR PDCCH, the NR PDCCH on the first symbol overlaps with the LTE CRS. The NR PDCCH on the second symbol does not overlap with the LTE CRS. The N resource elements for mapping PDCCH DMRS are on the second symbol, and the resource elements of mapping PDCCH DMRS are not included on the first symbol.

S1003, the terminal equipment receives signals on the determined N resource units.

In this embodiment, N resource elements on the second symbol are used only for mapping PDCCH DMRS. The terminal device may receive PDCCH DMRS on the N resource units.

S1004, the terminal equipment carries out channel estimation on the NR PDCCH according to the signals received on the N resource units.

The terminal device receives PDCCH DMRS in N resource elements on the second symbol and may perform NR PDCCH channel estimation based on PDCCH DMRS received from the N resource elements.

In the channel estimation method provided in this embodiment, the terminal device may determine N resource units mapped to PDCCH DMRS on the second symbol according to the mapping type of PDCCH DMRS, and may perform NR PDCCH channel estimation according to PDCCH DMRS received on the N resource units, thereby reducing channel estimation complexity of the terminal device.

The NR PDCCH may be transmitted on 3 symbols. The above embodiments are described by taking the transmission of the NR PDCCH on 2 symbols as an example, and do not limit the technical solutions provided in the embodiments of the present application.

In the following, transmission modes of NR PDCCHs and PDCCH DMRS will be exemplarily described with reference to fig. 11 to 12 by taking transmission of NR PDCCHs on 3 symbols as an example.

One possible transmission scheme is shown in fig. 11, and fig. 11 is a schematic diagram of another NR PDCCH DMRS resource mapping scheme based on DSS technology. Referring to fig. 11, taking LTE CRS with 4 ports and 0 cell-specific frequency offset as an example, the frequency domain positions of LTE CRS are subcarrier 0, subcarrier 3, subcarrier 6 and subcarrier 9.NR PDCCH is transmitted on symbol 1, symbol 2, and symbol 3.

Symbol 2 and symbol 3 are not used for transmitting LTE CRS. Subcarrier 1, subcarrier 5 and subcarrier 9 of symbol 2 are used for transmission PDCCH DMRS; NR PDCCH is transmitted on the remaining subcarriers of symbol 2. Subcarrier 1, subcarrier 5 and subcarrier 9 of symbol 3 are used for transmission PDCCH DMRS; NR PDCCH is transmitted on the remaining subcarriers of symbol 3.

Another possible transmission scheme is shown in fig. 12, and fig. 12 is a schematic diagram of another NR PDCCH DMRS resource mapping scheme based on DSS technology. Referring to fig. 12, taking LTE CRS with 4 ports and 0 cell-specific frequency offset as an example, the frequency domain positions of LTE CRS are subcarrier 0, subcarrier 3, subcarrier 6 and subcarrier 9.NR PDCCH is transmitted on symbol 1, symbol 2, and symbol 3.

LTE CRS may be transmitted simultaneously on symbol 1. On the symbol with LTE CRS, the network device transmits only NR PDCCH, and does not transmit PDCCH DMRS. On REs with LTE CRS, the network device may drop the NR PDCCH. For example, the NR PDCCH and LTE CRS on subcarrier 0, subcarrier 3, subcarrier 6 and subcarrier 9 of symbol 1 overlap, and the network device knocks out the NR PDCCH; NR PDCCH is transmitted on the remaining subcarriers of symbol 1.

Fig. 13 is a schematic structural diagram of a channel estimation device according to an embodiment of the present application. The channel estimation device provided in this embodiment may be a terminal device, or a module, a unit, a chip module, or the like in the terminal device. Referring to fig. 13, the channel estimation apparatus 10 includes: a receiving module 11, a determining module 12 and an estimating module 13, wherein,

the receiving module 11 is configured to receive first indication information, where the first indication information is used to indicate PDCCH DMRS resource mapping types;

the determining module 12 is configured to determine N resource units according to the PDCCH DMRS resource mapping type, where the N resource units are resource units mapped to by PDCCH DMRS, and N is a positive integer greater than or equal to 1;

the receiving module 11 is further configured to receive signals on the N resource units;

the estimation module 13 is configured to perform channel estimation on the NR PDCCH according to signals received on the N resource elements.

The channel estimation device provided in this embodiment may be used to execute the communication method executed by the terminal device in the above method embodiment, and its implementation principle and technical effects are similar, and are not described herein.

In a possible implementation, the estimation module 13 is specifically configured to:

In one possible embodiment, the receiving module 11 is specifically configured to:

Fig. 14 is a schematic structural diagram of another channel estimation device according to an embodiment of the present application. The channel estimation device provided in this embodiment may be a network device, or a module, a unit, a chip module, or the like in the network device. Referring to fig. 14, the channel estimation device 20 includes: a determination module 21 and a transmission module 22, wherein,

the determining module 21 is configured to determine a resource mapping type of PDCCH DMRS;

The sending module 22 is configured to send first indication information to a terminal device, where the first indication information is used to indicate PDCCH DMRS a resource mapping type; the PDCCH DMRS resource mapping type is used to determine the resource unit to which PDCCH DMRS is mapped.

The channel estimation device provided in this embodiment may be used to execute the communication method executed by the network device in the above method embodiment, and its implementation principle and technical effects are similar, and are not described herein.

In one possible implementation, the sending module 22 is specifically configured to:

Fig. 15 is a schematic hardware structure of a channel estimation device provided in the present application. The channel estimation device may be a terminal device, or a chip, a chip module, etc. in the terminal device. Referring to fig. 15, the channel estimation apparatus 30 may include: a processor 31 and a memory 32, wherein the processor 31 and the memory 32 may communicate; illustratively, the processor 31 and the memory 32 are in communication via a communication bus 33, said memory 32 being adapted to store program instructions, said processor 31 being adapted to invoke the program instructions in the memory to perform the log storage method as shown in any of the method embodiments described above.

Optionally, the channel estimation device 30 may also include a communication interface, which may include a transmitter and/or a receiver.

Alternatively, the processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor or in a combination of hardware and software modules within a processor.

Fig. 16 is a schematic hardware structure of another channel estimation device provided in the present application. The channel estimation device may be a network device, or a chip, a chip module, etc. in the network device. Referring to fig. 14, the channel estimation apparatus 40 may include: a processor 41 and a memory 42, wherein the processor 41 and the memory 42 can communicate; illustratively, the processor 41 and the memory 42 are in communication via a communication bus 43, said memory 42 being adapted to store program instructions, said processor 41 being adapted to invoke the program instructions in the memory to perform the log storage method as shown in any of the method embodiments described above.

Optionally, the channel estimation device 40 may further comprise a communication interface, which may comprise a transmitter and/or a receiver.

The embodiment of the present application further provides a computer readable storage medium, where a computer program is stored, where the computer program, when executed by a computer, implements a channel estimation method executed by any one of the method embodiments above, and its implementation principle and technical effect are similar, and are not described herein.

The embodiments of the present application further provide a computer program product, which includes a computer program, where the computer program when executed by a computer implements a channel estimation method implemented by any of the method embodiments above, and the implementation principle and technical effects are similar, and are not described herein again.

All or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a readable memory. The program, when executed, performs steps including the method embodiments described above; and the aforementioned memory (storage medium) includes: read-only memory (ROM), RAM, flash memory, hard disk, solid state disk, magnetic tape, floppy disk, optical disk, and any combination thereof.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processing unit of a general purpose computer, special purpose computer, embedded processor, or other programmable terminal device to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable terminal device to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable terminal device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer implemented process such that the instructions which execute on the computer or other programmable device provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to encompass such modifications and variations.

In the present application, the term "include" and variations thereof may refer to non-limiting inclusion; the term "or" and variations thereof may refer to "and/or". The terms "first," "second," and the like in this application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. In the present application, "plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Claims

1. A method of channel estimation, comprising:

receiving signals on the N resource units;

2. The method of claim 1, wherein the time domain resources of the NR PDCCH include a first symbol and a second symbol;

3. The method of claim 2, wherein the channel estimating the NR PDCCH from the signals received on the N resource elements comprises:

4. The method of claim 1, wherein the time domain resources of the NR PDCCH include a first symbol and a second symbol;

5. The method of claim 4, wherein the resource elements corresponding to the second symbol do not include resource elements to which LTE CRS is mapped.

6. The method according to claim 1, wherein the method further comprises:

7. The method of claim 1, wherein the PDCCH DMRS resource mapping type is associated with a resource unit for channel estimation among the resource units mapped to by the PDCCH DMRS.

8. A method of channel estimation, comprising:

determining a resource mapping type of a physical downlink control channel PDCCH demodulation reference signal DMRS;

9. The method of claim 8, wherein the method further comprises:

10. The method of claim 8, wherein the PDCCH DMRS resource mapping type is associated with a resource unit for channel estimation among the resource units mapped to by the PDCCH DMRS.

11. A channel estimation apparatus, comprising: a receiving module, a determining module and an estimating module, wherein,

the receiving module is configured to receive first indication information, where the first indication information is used to indicate a DMRS resource mapping type of a PDCCH demodulation reference signal;

12. A channel estimation apparatus, comprising: a determining module and a transmitting module, wherein,

The determining module is used for determining the resource mapping type of the physical downlink control channel PDCCH demodulation reference signal DMRS;

13. A channel estimation device, comprising: a processor, and a memory communicatively coupled to the processor;

the memory stores a computer program;

the processor executes the computer program to implement the method of any one of claims 1 to 7 or to implement the method of any one of claims 8 to 10.

14. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a computer, implements the method according to any of claims 1 to 7 or implements the method according to any of claims 8 to 10.

15. A computer program product comprising a computer program which, when executed by a computer, implements the method of any one of claims 1 to 7 or implements the method of any one of claims 8 to 10.