CN111342940B

CN111342940B - PDSCH (physical Downlink shared channel) configuration and receiving method and device, storage medium, base station and terminal

Info

Publication number: CN111342940B
Application number: CN201811548641.5A
Authority: CN
Inventors: 周欢; 王化磊; 沈兴亚
Original assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Current assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2022-06-10
Anticipated expiration: 2038-12-18
Also published as: CN111342940A

Abstract

A configuration method of PDSCH, a receiving method and a device thereof, a storage medium, a base station and a terminal, the configuration method comprises the following steps: determining the duration of a downlink initial time slot and the adopted PDSCH mapping type according to the access time of accessing the unlicensed spectrum; if the PDSCH mapping type is type A and the downlink initial time slot does not comprise the initial symbol of the preposed DMRS, adjusting the initial symbol position of the specific DMRS in the maximum possible time length of the downlink initial time slot so as to try to place the specific DMRS in the downlink initial time slot and map PDSCH data to the downlink initial time slot except the symbol used by the specific DMRS; transmitting specific DMRS and PDSCH data to a user equipment, the specific DMRS including at least one of: preamble DMRS, additional DMRS. By the scheme of the invention, the UE can decode the PDSCH data by using the specific DMRS in the downlink initial time slot.

Description

PDSCH (physical Downlink shared channel) configuration and receiving method and device, storage medium, base station and terminal

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a PDSCH configuring and receiving method and apparatus, a storage medium, a base station, and a terminal.

Background

The 3rd Generation Partnership Project (3 GPP) standards organization will study how to deploy The Fifth-Generation mobile communications (5G for short) New wireless (New Radio, NR for short) system on The unlicensed spectrum, so as to achieve The purpose of fairly and effectively utilizing The unlicensed spectrum and increasing The data transmission rate of The NR system. NR systems use unlicensed spectrum Technology, also known as New Radio Access Technology unlicensed (NR-U) Technology.

There are three main ways of NR-U technology. A first NR cell of an unlicensed spectrum is used as a primary cell; the second is that a User Equipment (User Equipment, UE for short) accesses an unlicensed spectrum NR cell through a licensed spectrum Long Term Evolution (LTE) cell, and the third is that the UE accesses an unlicensed spectrum NR cell through a licensed spectrum NR cell. In the second and third modes, the UE and the NR base station (also referred to as a gNB) or an evolved Node B (eNB) may operate on the licensed spectrum and the unlicensed spectrum simultaneously through a carrier aggregation technique.

The resource mapping type of the NR system supporting the Physical Downlink Shared CHannel (PDSCH) may be type a (type a) and type b (type b). When the resource mapping type of the PDSCH is type a, the pre-DMRS will be mapped according to the position configured in the PBCH. And when the resource mapping type of the PDSCH is type B, the preamble DMRS may be in the first symbol position of the PDSCH.

Since the access time of the channel to the unlicensed spectrum may be in the middle of the timeslot, not at the timeslot boundary, the number of symbols included in the downlink initial timeslot may be less than 14 symbols. Currently, when the number of symbols of the downlink initial slot is less than 14, how to transmit the PDSCH in the downlink initial slot needs to be carefully studied.

Disclosure of Invention

The technical problem solved by the invention is how to send the PDSCH in the downlink initial time slot to decode PDSCH data when the downlink initial time slot is less than 14 symbols and the PDSCH mapping type is type A.

To solve the foregoing technical problem, an embodiment of the present invention provides a PDSCH configuring method, including: determining the duration of a downlink initial time slot according to the access time of accessing the unlicensed spectrum, and determining the PDSCH mapping type adopted by the downlink initial time slot; if the PDSCH mapping type is type A and the downlink initial time slot does not comprise the initial symbol of the preposed DMRS, adjusting the initial symbol position of a specific DMRS in the maximum possible time length of the downlink initial time slot so as to try to place the specific DMRS in the downlink initial time slot and map PDSCH data into the downlink initial time slot except the symbol used by the specific DMRS; transmitting the specific DMRS and PDSCH data to a user equipment, wherein the specific DMRS at least comprises one of the following: preamble DMRS, additional DMRS.

Optionally, the configuration method further includes: before determining the time length of the downlink initial time slot, configuring the initial symbol position of the specific DMRS based on the maximum possible time length of the downlink initial time slot.

Optionally, the specific DMRS includes a preamble DMRS, and the adjusting an initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot includes: and shifting the initial symbol position of the preposed DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot, wherein N is a symbol index of the initial symbol position of the preposed DMRS, and N is a positive integer.

Optionally, the specific DMRS further includes an additional DMRS, and the adjusting an initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot further includes: offsetting the initial symbol position of the additional DMRS by N symbols.

Optionally, the specific DMRS further includes an additional DMRS, and the adjusting an initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot further includes: shifting the initial symbol position of the additional DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot.

Optionally, the specific DMRS further includes an additional DMRS, and the adjusting an initial symbol position of the specific DMRS in the maximum possible time duration of the downlink initial slot further includes: placing the additional DMRS in the downlink initial slot based on an initial symbol position of the additional DMRS.

Optionally, the specific DMRS further includes an additional DMRS, and the adjusting an initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot further includes: and offsetting the initial symbol position of the additional DMRS by M symbols from the initial symbol of the downlink initial time slot, wherein M is a symbol index of the initial symbol position of the additional DMRS, and M is a positive integer.

Optionally, the specific DMRS includes a preamble DMRS, and the adjusting an initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot includes: and placing the pre-DMRS at the initial position of the downlink initial time slot.

Optionally, the specific DMRS further includes an additional DMRS, and the adjusting an initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot further includes: placing the additional DMRS in the downlink initial slot based on an initial symbol position of the additional DMRS.

Optionally, the adjusting the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot includes: and if the high-level signaling is not configured with the additional DMRS, selecting a preset number of additional DMRSs from the candidate additional DMRSs which can be configured by the high-level signaling, and placing the additional DMRS in the downlink initial time slot according to the symbol position of the selected additional DMRS.

Optionally, the preset number is 2, the symbol positions of the selected additional DMRS are a symbol 7 and a symbol 11, and the placing the additional DMRS in the downlink initial time slot according to the symbol position of the selected additional DMRS includes: and placing the additional DMRS in a symbol 7 and a symbol 11 of the downlink initial time slot.

Optionally, before transmitting the specific DMRS and PDSCH data to the user equipment, the method further includes: and if the PDSCH mapping type is type A and the downlink initial time slot comprises the initial symbol of the preposed DMRS, placing the preposed DRMS in the downlink initial time slot based on the initial symbol position of the preposed DMRS.

Optionally, the mapping the PDSCH data to the downlink initial time slot except for the symbol used by the specific DMRS includes: and mapping the PDSCH data to PDSCH symbols of the downlink initial time slot, and discarding the non-mapped PDSCH data.

In order to solve the above technical problem, an embodiment of the present invention further provides a method for receiving a PDSCH, including: receiving specific DMRS (demodulation reference signal) and PDSCH (physical downlink shared channel) data from a network based on a downlink initial time slot, wherein the duration of the downlink initial time slot and the PDSCH mapping type adopted by the downlink initial time slot are determined according to the access time of accessing an unlicensed spectrum; if the PDSCH mapping type is type A and the downlink initial time slot does not comprise the initial symbol of the preposed DMRS, the PDSCH data mapped to the downlink initial time slot except the symbol used by the specific DMRS is subjected to demapping based on the specific DMRS in the downlink initial time slot; wherein the specific DMRS includes at least one of: preamble DMRS, additional DMRS.

Optionally, before receiving the specific DMRS and PDSCH data from the network, the method further comprises: and determining the initial symbol position of the specific DMRS based on the maximum possible duration of the downlink initial time slot.

Optionally, before demapping PDSCH data mapped to a downlink initial time slot other than the symbol used by the specific DMRS, the method further includes: and if the specific DMRS is in the downlink initial time slot, determining the symbol position of the specific DMRS in the downlink initial time slot.

Optionally, the determining the symbol position of the specific DMRS in the downlink initial slot includes: determining a symbol position obtained by offsetting the initial symbol position of the pre-DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot as the symbol position of the pre-DMRS, wherein N is a symbol index of the initial symbol position of the pre-DMRS, and N is a positive integer.

Optionally, the determining the symbol position of the specific DMRS in the downlink initial slot further includes: and determining a symbol position obtained by offsetting the symbol position of the additional DMRS by N symbols as the symbol position of the additional DMRS.

Optionally, the specific DMRS further includes an additional DMRS, and the determining a symbol position of the specific DMRS in the downlink initial slot includes: and determining a symbol position obtained by offsetting the initial symbol position of the additional DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot as the symbol position of the additional DMRS.

Optionally, the specific DMRS further includes an additional DMRS, and the determining a symbol position of the specific DMRS in the downlink initial slot includes: determining an initial symbol position of the additional DMRS as a symbol position of the additional DMRS.

Optionally, the determining the symbol position of the specific DMRS in the downlink initial slot further includes: and determining a symbol position obtained by offsetting the symbol position of the additional DMRS by M symbols from the initial symbol of the downlink initial time slot as the symbol position of the additional DMRS, wherein M is a symbol index of the initial symbol position of the additional DMRS, and M is a positive integer.

Optionally, the determining the symbol position of the specific DMRS in the downlink initial slot includes: and determining the initial symbol position of the downlink initial time slot as the symbol position of the preposed DMRS.

Optionally, the determining the symbol position of the specific DMRS in the downlink initial slot includes: if the high-level signaling does not configure the additional DMRS, determining the symbol position of the additional DMRS based on a preset number of additional DMRSs determined by the network and the symbol positions of the additional DMRS selected by the network; and the symbol positions of the preset number of additional DMRSs and the additional DMRS are selected by the network from candidate additional DMRSs which can be configured by the high-layer signaling.

Optionally, the preset number is 2, the symbol positions of the selected additional DMRS are a symbol 7 and a symbol 11, and the determining the symbol position of the additional DMRS includes: and determining the symbol 7 and the symbol 11 of the downlink initial time slot as the symbol position of the additional DMRS.

Optionally, before demapping PDSCH data mapped to a downlink initial time slot other than the symbol used by the specific DMRS, the method further includes: and if the PDSCH mapping type is type A and the downlink initial time slot comprises the initial symbol of the preposed DMRS, determining the initial symbol position of the preposed DMRS as the symbol position of the preposed DRMS.

Optionally, the receiving method further includes: and when the PDSCH data is de-mapped, ignoring the un-mapped PDSCH data.

To solve the foregoing technical problem, an embodiment of the present invention further provides a PDSCH configuring device, including: the determining module is suitable for determining the duration of a downlink initial time slot according to the access time of accessing the unlicensed spectrum and determining the PDSCH mapping type adopted by the downlink initial time slot; a mapping module, adapted to adjust an initial symbol position of a specific DMRS in a maximum possible duration of the downlink initial slot to attempt to place the specific DMRS in the downlink initial slot and map PDSCH data into the downlink initial slot except for a symbol used by the specific DMRS, if the PDSCH mapping type is type a and the downlink initial slot does not include an initial symbol of a preamble DMRS; a transmitting module adapted to transmit the specific DMRS and PDSCH data to a user equipment, wherein the specific DMRS includes at least one of: preamble DMRS, additional DMRS.

To solve the above technical problem, an embodiment of the present invention further provides a PDSCH receiving apparatus, including: the receiving module is suitable for receiving specific DMRS and PDSCH data from a network based on a downlink initial time slot, and the duration of the downlink initial time slot and the PDSCH mapping type adopted by the downlink initial time slot are both determined according to the access time of accessing the unlicensed spectrum; a demapping module, adapted to, if a PDSCH mapping type is type a and the downlink initial slot does not include an initial symbol of a pre-DMRS, demap PDSCH data mapped to the downlink initial slot other than a symbol used by a specific DMRS based on the specific DMRS in the downlink initial slot; wherein the specific DMRS includes at least one of: preamble DMRS, additional DMRS.

To solve the above technical problem, an embodiment of the present invention further provides a storage medium having stored thereon computer instructions, where the computer instructions execute the steps of the above method when executed.

In order to solve the above technical problem, an embodiment of the present invention further provides a base station, including a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the above method.

In order to solve the foregoing technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the foregoing method.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

the embodiment of the invention provides a configuration method of a PDSCH, which comprises the following steps: determining the duration of a downlink initial time slot and the PDSCH mapping type adopted by the downlink initial time slot according to the access time of accessing the unlicensed spectrum; if the PDSCH mapping type is type A and the downlink initial time slot does not comprise the initial symbol of the preposed DMRS, adjusting the initial symbol position of a specific DMRS in the maximum possible time length of the downlink initial time slot so as to try to place the specific DMRS in the downlink initial time slot and map PDSCH data into the downlink initial time slot except the symbol used by the specific DMRS; transmitting the specific DMRS and PDSCH data to a user equipment, wherein the specific DMRS at least comprises one of the following: preamble DMRS, additional DMRS. By the technical scheme provided by the embodiment of the invention, after the duration of the downlink initial time slot and the mapping type of the PDSCH are determined, the adjustment of the specific DMRS to the downlink initial time slot can be tried, so that the terminal can de-map PDSCH data based on the preposed DMRS and/or the extra DMRS of the downlink initial time slot, and the possibility of transmitting PDSCH data in the downlink initial time slot is provided. Even if the downlink initial time slot does not include the initial symbol of the pre-DMRS and the PDSCH is not configured with the extra DMRS, the PDSCH can be decoded by adopting the technical scheme provided by the embodiment of the invention.

Further, the specific DMRS includes a preamble DMRS, and the adjusting an initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot includes: and shifting the initial symbol position of the preposed DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot, wherein N is a symbol index of the initial symbol position of the preposed DMRS, and N is a positive integer. The embodiment of the invention moves the preposed DMRS at the initial symbol position to the downlink initial time slot, further indicates the DMRS symbol position in the downlink initial time slot, and provides a feasible scheme for transmitting PDSCH data in the downlink initial time slot.

Further, the adjusting the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot includes: and if the high-level signaling is not configured with the additional DMRS, selecting a preset number of additional DMRSs from the candidate additional DMRSs which can be configured by the high-level signaling, and placing the additional DMRS in the downlink initial time slot according to the symbol position of the selected additional DMRS. The embodiment of the invention abandons the preposed DMRS at the initial symbol position, and puts the extra DMRS into the downlink initial time slot, thereby providing a feasible scheme for decoding PDSCH data in the downlink initial time slot.

Drawings

Fig. 1 is a flowchart illustrating a PDSCH configuring method according to an embodiment of the present invention;

fig. 2 is a diagram illustrating mapping of a PDSCH and a pre-DMRS according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a PDSCH and pre-DMRS mapping according to an embodiment of the present invention;

fig. 4 is a diagram illustrating mapping of a PDSCH and a pre-DMRS according to another embodiment of the present invention;

fig. 5 is a diagram illustrating another PDSCH and pre-DMRS mapping according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a PDSCH receiving method according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a PDSCH configuring apparatus according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a PDSCH receiving apparatus according to an embodiment of the present invention;

FIG. 9 is a flow diagram illustrating data interaction in an exemplary scenario, in accordance with an embodiment of the present invention.

Detailed Description

Those skilled in the art understand that when the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols (hereinafter referred to as symbols for simplicity) of the downlink initial slot is less than 14, there are two technical solutions for transmitting the PDSCH: firstly, sending a plurality of PDSCHs of type B to occupy the initial downlink time slot; the second is to puncture PDSCH to fit the downlink initial timeslot. However, if the initial downlink slot starts from symbol 4, the PDSCH in the initial downlink slot does not include the pre-DMRS, and the PDSCH cannot be decoded without configuring the DMRS.

Specifically, in the prior art, when the resource mapping type of a Physical Downlink Shared CHannel (PDSCH) and a Physical Uplink Shared CHannel (PUSCH) supported in an NR is type a (type a), a pre-demodulation Reference Signal (DMRS) is mapped only according to a symbol position configured in a Physical Broadcast CHannel (PBCH). And when the resource mapping type of the PDSCH/PUSCH is type b (type b), the pre-DMRS is in the first symbol position of the PDSCH/PUSCH. The parameter DMRS-type a-Position in PBCH may also configure the preamble DMRS of PDSCH resource mapping type a to be at symbol 2 or at symbol 3.

Table 1 shows symbol start positions and symbol lengths allowed to be used in different mapping types of PDSCH according to the prior art. As shown in table 3, for PDSCH mapping type B, the symbol length may be 2, 4, 6, 7; for PDSCH mapping type a, its symbol length may be 3 to 14, and the protocol requires that its starting position must contain a preamble DMRS.

TABLE 1

In addition to the pre-DMRS, the higher layer signaling, such as Radio Resource Control (RRC) signaling, may also configure additional DMRSs (additional DMRSs), including additional DMRS symbol positions and numbers, DMRS types, DMRS maximum lengths, DMRS scrambling codes, and so on.

Table 2 shows that a single-symbol (single-symbol) DMRS is located at a symbol position of the PDSCH, and table 3 shows that a double-symbol (double-symbol) DMRS is located at a symbol position of the PDSCH.

TABLE 2

TABLE 3

In the NR-U technique, a first access channel accessed to the unlicensed spectrum, and a time slot in which a downlink channel signal can be transmitted is referred to as a downlink initial time slot. Since the access channel time may be at a symbol in the middle of a slot, not at the slot boundary, the number of symbols included in the downlink initial slot may be less than 14. When the number of symbols included in the downlink initial slot is less than 14, how to transmit PDSCH data has not been solved effectively. In the prior art, several PDSCH types B may be used to fill up the initial downlink timeslot, or PDSCH data may be punctured to adapt to the initial downlink timeslot. However, if the initial symbol of the initial downlink slot is symbol 4 and the preamble DMRS configured by the PBCH is at symbol 3, it means that the transmitted PDSCH does not contain the preamble DMRS. If the PDSCH is not configured with additional DMRS, the PDSCH cannot be decoded.

The embodiment of the invention provides a configuration method of a PDSCH, which comprises the following steps: determining the duration of a downlink initial time slot and the PDSCH mapping type adopted by the downlink initial time slot according to the access time of accessing the unlicensed spectrum; if the PDSCH mapping type is type A and the downlink initial time slot does not comprise the initial symbol of the preposed DMRS, adjusting the initial symbol position of a specific DMRS in the maximum possible time length of the downlink initial time slot so as to try to place the specific DMRS in the downlink initial time slot and map PDSCH data into the downlink initial time slot except the symbol used by the specific DMRS; transmitting the specific DMRS and PDSCH data to a user equipment, wherein the specific DMRS at least comprises one of the following: preamble DMRS, additional DMRS.

By the technical scheme provided by the embodiment of the invention, after the duration of the downlink initial time slot and the mapping type of the PDSCH are determined, the specific DMRS can be adjusted to the downlink initial time slot, so that the terminal can de-map PDSCH data based on the preposed DMRS and/or the extra DMRS of the downlink initial time slot, and the possibility of transmitting PDSCH data in the downlink initial time slot is provided. Even if the downlink initial time slot does not comprise the initial symbol of the preposed DMRS and the PDSCH is not configured with the additional DMRS, the PDSCH can be decoded by adopting the technical scheme provided by the embodiment of the invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 1 is a flowchart illustrating a PDSCH configuration method according to an embodiment of the present invention, which can be applied to a network side, for example, implemented by NR gNB. Specifically, the configuration method may include:

step S101, determining the duration of a downlink initial time slot according to the access time of accessing the unlicensed spectrum, and determining the PDSCH mapping type adopted by the downlink initial time slot;

step S102, if the PDSCH mapping type is type A and the downlink initial time slot does not include the initial symbol of the preposed DMRS, adjusting the initial symbol position of a specific DMRS in the maximum possible time length of the downlink initial time slot so as to try to place the specific DMRS in the downlink initial time slot and map PDSCH data to the downlink initial time slot except the symbol used by the specific DMRS;

Step S103, sending the specific DMRS and PDSCH data to user equipment, wherein the specific DMRS at least comprises one of the following: preamble DMRS, additional DMRS.

In step S101, the NR gNB may determine a transport block size of the downlink initial slot. The transport Block size depends on the number of frequency domain Physical Resource Blocks (PRBs) to be scheduled by the gNB, and the number of reference signal symbols such as configured DMRSs. In general, a base station may indicate that a User Equipment (UE) preamble DMRS is at symbol 2 or symbol 3 based on a PBCH.

After accessing to the unlicensed spectrum, the gNB may determine a duration of the downlink initial timeslot. In a specific implementation, the NR gNB may further determine a PDSCH mapping type of the downlink initial timeslot. The PDSCH mapping type may be type a or type B.

In step S102, the downlink initial slot may be smaller than 14 symbols. For example, the downlink initial slot is from symbol 3 to symbol 14; for another example, the downlink initial slot is from symbol 5 to symbol 14; as another example, the downlink initial slot is from symbol 7 to symbol 14.

In a specific implementation, if the PDSCH mapping type is type a and the downlink initial slot does not include an initial symbol of a preamble DMRS configured by a PBCH, the gNB may adjust a symbol position of the preamble DMRS and/or an additional DMRS in a maximum possible duration of the downlink initial slot, so that the downlink initial slot includes at least one of the preamble DMRS and the additional DMRS. It should be noted that, if higher layer signaling (e.g., RRC signaling) is configured with an additional DMRS in advance, the gNB may attempt to place the pre-DMRS and the additional DMRS together in the downlink initial slot.

Thereafter, the gNB may also map PDSCH data into a downlink initial slot other than symbols used by the preamble DMRS and/or the additional DMRS.

As a non-limiting example, if a downlink initial slot includes an initial symbol of a pre-DMRS indicated by a PBCH, the downlink initial slot may place the pre-DMRS into the downlink initial slot according to an initial symbol position of the pre-DMRS indicated by the PBCH. Thereafter, the PDSCH in the initial downlink slot may start from the first available symbol to the last symbol, where the available symbol refers to a symbol allowing transmission of PDSCH data. In this case, the symbol position of the preamble DMRS in the downlink initial slot is the same as the symbol position of the preamble DMRS in the existing protocol. Accordingly, the mapping sequence of the PDSCH data also starts from the first available Resource Element (RE) to the last available RE. Discarding the un-mapped PDSCH data if there is remaining PDSCH data that is un-mapped.

In a specific implementation, if the downlink initial slot does not include an initial symbol of a preamble DMRS indicated by a PBCH, the position of the initial symbol of the preamble DMRS may be shifted by N symbols from the initial symbol of the downlink initial slot, where N is a symbol index of the initial symbol position of the preamble DMRS, and N is a positive integer. In a specific implementation, N is a symbol index of a preamble DMRS indicated by a PBCH, and N is 2 or 3.

Afterwards, if no additional DMRS is configured for higher layer signaling, the PDSCH in the downlink initial slot may start from the first available symbol to the last symbol except for the preamble DMRS. The mapping order of the PDSCH data may still go from the first available RE to the last available RE. If there is remaining PDSCH data that is not mapped at this time, the gNB may discard the non-mapped PDSCH data and the UE may ignore the non-mapped PDSCH data.

Fig. 2 is a mapping diagram of a PDSCH and a pre-DMRS according to an embodiment of the present invention. Referring to fig. 2, the maximum duration of the downlink initial slot includes 14 symbols (represented by squares corresponding to 0 to 13 in the figure), and the initial symbol of the preamble DMRS is located at symbol 2 (represented by a dot in the figure). The duration of the downlink initial time slot determined by the access unlicensed spectrum includes 11 symbols, including symbol 3 to symbol 13. After the pre-DMRS is adjusted to the determined downlink initial slot, the initial symbol position of the pre-DMRS is shifted by 2 symbols from the starting symbol of the PDSCH of the downlink initial slot, and is placed in symbol 5 (shown by a vertical line square in the figure), and the PDSCH data is mapped to the remaining available symbols (shown by a diagonal line square in the figure) except for symbol 5.

Further, if higher layer signaling (e.g., RRC signaling) previously configured an additional DMRS (e.g., located at an initial symbol position of the additional DMRS) for the PDSCH in the downlink initial slot of the maximum possible duration, after determining the duration of the downlink initial slot, the gNB may shift the initial symbol position of the additional DMRS by N symbols in an attempt to place the additional DMRS in the downlink initial slot.

For example, if the initial symbol position of the additional DMRS is located at symbol M-7, the initial symbol position of the preamble DMRS is located at symbol N-2, and the initial symbol of the downlink initial slot is symbol 4, the additional DMRS will be placed at symbol (M + N) -9 of the downlink initial slot. For another example, if the initial symbol position of the additional DMRS is located at symbol M-11, the initial symbol position of the preamble DMRS is located at symbol N-2, and the starting symbol of the downlink initial slot is symbol 4, then the additional DMRS will be placed at symbol (M + N) -13 of the downlink initial slot.

As a variant embodiment, if the PDSCH is configured with an additional DMRS, the gNB may shift the initial symbol position of the additional DMRS by (M + N) symbols from the starting symbol of the PDSCH of the downlink initial slot in an attempt to place the additional DMRS in the downlink initial slot, M being a symbol index of the initial symbol position of the additional DMRS, N being a symbol index of the initial symbol position of the preamble DMRS, M, N being positive integers.

For example, when N is 2 and M is 5, if the starting symbol of the downlink initial slot is symbol K is 3, the additional DMRS will be placed at symbol 10(3+5+2 is 10) from the starting symbol of the PDSCH of the downlink initial slot. For another example, if the starting symbol of the downlink initial slot is symbol K-5 when N-3 and M-9, the initial symbol position of the additional DMRS is shifted by (M + N-12) symbols from the starting symbol of the PDSCH of the downlink initial slot, and those skilled in the art understand that since the maximum symbol index of the downlink initial slot is symbol 13. In this case, the additional DMRS will be moved out of the downlink initial slot, and at this time, no additional DMRS is configured in the downlink initial slot.

As yet another variation, the gNB may place the additional DMRS in the downlink initial slot based on an initial symbol position of the additional DMRS.

For example, if the initial symbol position of the additional DMRS is located at symbol M ═ 9, the additional DMRS may be placed at symbol 9 in the downlink initial slot. For another example, if the initial symbol position of the additional DMRS is located at symbol M ═ 11, the additional DMRS may be placed at symbol 11 in the downlink initial slot.

As another variation, the gNB may shift the initial symbol position of the additional DMRS by M symbols from the starting symbol of the downlink initial slot to attempt to place the additional DMRS in the downlink initial slot. Wherein M is a symbol index of an initial symbol position of the additional DMRS, and M is a positive integer.

For example, if the starting symbol of the downlink initial slot is symbol K-4, and the initial symbol position of the additional DMRS is located at symbol M-9, the additional DMRS may be located at symbol (K + M) -13 in the downlink initial slot. In a specific implementation, the additional DMRS may be offset according to the actual situation. And if the offset extra DMRS exceeds the maximum symbol index of the downlink initial time slot, the downlink initial time slot is not configured with the extra DMRS any more.

Fig. 3 is a diagram illustrating mapping of a PDSCH and a pre-DMRS according to an embodiment of the present invention. Referring to fig. 3, the maximum duration of the downlink initial slot includes 14 symbols (represented by squares corresponding to 0 to 13 in the figure), the initial symbol of the preamble DMRS is located at symbol 2 (represented by dots in the figure), and the initial symbol of the additional DMRS is located at symbol 9 (represented by small squares in the figure). The duration of the downlink initial time slot determined by the access unlicensed spectrum includes 11 symbols, including symbol 3 to symbol 13. After determining the duration of the downlink initial slot, the gNB may adjust the symbol position of the preamble DMRS by: the initial symbol position of the preamble DMRS is shifted by 2 symbols from the initial symbol of the PDSCH of the downlink initial time slot, the initial symbol position of the preamble DMRS is placed in a symbol 5 (shown by a vertical line square in the figure), the initial symbol position of the additional DMRS is shifted by 9 symbols (shown by a horizontal line square in the figure) and is placed in a symbol 12, and the PDSCH data is mapped to the rest available symbols (shown by oblique line squares in the figure) except for the symbol 5 and the symbol 12. Note that, when PDSCH mapping is performed, symbol 9 is also used for mapping PDSCH data.

As a further non-limiting example, if the downlink initial slot does not contain an initial symbol of a pre-DMRS indicated by a PBCH, the pre-DMRS may be placed in a starting symbol of a PDSCH of the downlink initial slot. Then, if no additional DMRS is configured for higher layer signaling, the downlink initial slot may be inserted into the PDSCH from the first available symbol to the last symbol, except for the preamble DMRS. The mapping order of PDSCH data may end from the first available RE to the last available RE. If there is remaining PDSCH data that is not mapped at this time, the gNB may discard the non-mapped PDSCH data and the UE may ignore the non-mapped PDSCH data.

In a specific implementation, if RRC signaling configures an additional DMRS in advance for a PDSCH in a downlink initial slot in which an initial symbol position of the additional DMRS is the largest possible duration, after determining the downlink initial slot, the gNB may place the additional DMRS in the downlink initial slot according to the initial symbol position of the additional DMRS.

Fig. 4 is a diagram illustrating mapping of a PDSCH and a pre-DMRS according to still another embodiment of the present invention. Referring to fig. 4, the maximum duration of the downlink initial slot includes 14 symbols (represented by squares corresponding to 0 to 13 in the figure), the initial symbol of the preamble DMRS is located at symbol 2 (represented by dots in the figure), and the initial symbol of the additional DMRS is located at symbol 9 (represented by small squares in the figure). The duration of the downlink initial time slot determined by the access unlicensed spectrum includes 11 symbols, including symbol 3 to symbol 13. After determining the duration of the downlink initial slot, the preamble DMRS may be adjusted to a starting symbol of the downlink initial slot. That is, the preamble DMRS is placed on a symbol 3 (indicated by a vertical line square in the drawing). After that, the initial symbol position of the additional DMRS is kept unchanged (indicated by a horizontal line square in the figure), and still placed in the symbol 9, and the PDSCH data is mapped to the remaining available symbols (indicated by diagonal line squares in the figure) except for the symbol 3 and the symbol 9.

As another non-limiting example, if the downlink initial slot does not include an initial symbol of a pre-DMRS indicated by a PBCH, and no additional DMRS is configured in a higher layer signaling, the gNB may ignore the pre-DMRS, select a preset number of additional DMRSs from candidate additional DMRSs that can be configured in the higher layer signaling, and place the additional DMRS in the downlink initial slot according to a symbol position of the selected additional DMRS. Referring to table 2, the preset number of additional DMRSs may be 1, 2, or 3, and accordingly, when the preset number is 1, the candidate additional DMRSs may be located at symbol 7, symbol 9, or symbol 11; when the preset number is 2, the candidate additional DMRSs may be located at symbol 6 and symbol 9; or symbol 7 and symbol 11; when the preset number is 3, the candidate additional DMRSs may be located at symbol 5, symbol 8, and symbol 11.

In a specific implementation, when the preset number is 2, the symbol positions of the selected additional DMRS may be symbol 7 and symbol 11. After determining the duration of the downlink initial slot, additional DMRSs may be placed in symbol 7 and symbol 11 of the downlink initial slot.

Fig. 5 is another PDSCH and pre-DMRS mapping diagram according to an embodiment of the invention. Referring to fig. 5, the maximum duration of the downlink initial slot includes 14 symbols (represented by squares corresponding to 0 to 13 in the figure), the initial symbol of the preamble DMRS is located at symbol 2 (represented by a dotted line in the figure), and no additional DMRS is configured in the higher layer signaling. The duration of the downlink initial time slot determined by the access unlicensed spectrum includes 11 symbols, including symbol 3 to symbol 13. After determining the duration of the downlink initial slot, the gNB may discard the preamble DMRS and place the symbol positions of the additional DMRS in symbol 7 and symbol 11 (indicated by horizontal line squares in the figure), and the PDSCH data is mapped to the remaining available symbols (indicated by diagonal line squares in the figure) except for symbol 7 and symbol 11.

In step S103, the gNB may transmit the specific DMRS and PDSCH data placed in the downlink initial slot to the UE. Wherein the specific DMRS may be a preamble DMRS, an additional DMRS, or both. For the UE, the UE may receive, from the gNB, the specific DMRS and PDSCH data in the downlink initial time slot, and then demap the PDSCH data based on the specific DMRS. If the gNB discards the un-mapped PDSCH data during mapping PDSCH data, the UE will ignore the un-mapped PDSCH data.

Fig. 6 is a flowchart illustrating a PDSCH receiving method according to an embodiment of the present invention. The receiving method can be used for the UE side. Specifically, the receiving method may include the steps of:

step S601, receiving specific DMRS and PDSCH data from a network based on a downlink initial time slot, wherein the duration of the downlink initial time slot and the PDSCH mapping type adopted by the downlink initial time slot are both determined according to the access time of accessing the unlicensed spectrum;

step S602, if the PDSCH mapping type is type A and the downlink initial time slot does not include the initial symbol of the pre-DMRS, based on the specific DMRS in the downlink initial time slot, the PDSCH data mapped to the downlink initial time slot except the symbol used by the specific DMRS is demapped.

Wherein the specific DMRS comprises at least one of: preamble DMRS, additional DMRS.

More specifically, the UE may determine, according to the received configuration information, a maximum possible duration of the downlink initial slot and an initial symbol position of the specific DMRS.

In step S601, the UE may receive PDSCH data from the network and decode DMRS signals for the PDSCH data based on the downlink initial slot. The duration of the downlink initial time slot and the PDSCH mapping type adopted by the downlink initial time slot may both be determined according to the access time of accessing the unlicensed spectrum. The PDSCH mapping type may be type a or type B.

In step S602, if the PDSCH mapping type is type a and the downlink initial slot includes an initial symbol of a preamble DMRS, the UE may determine the initial symbol position of the preamble DMRS as the symbol position of the preamble DRMS.

As a variation, if the PDSCH mapping type is type a and the downlink initial slot does not include an initial symbol of a preamble DMRS, the UE may determine a symbol position of a specific DMRS in the downlink initial slot. And then, based on the specific DMRS, performing demapping on PDSCH data mapped to a downlink initial time slot except for the symbol used by the specific DMRS.

In a particular implementation, the particular DMRS includes a preamble DMRS. If the gNB shifts the initial symbol position of the preamble DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot, the UE may determine, as the symbol position of the preamble DMRS, a symbol position obtained by shifting the initial symbol position of the preamble DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot. Wherein N is a symbol index of an initial symbol position of the preamble DMRS, and N is a positive integer.

Further, the specific DMRS further includes an additional DMRS. If the gNB offsets the initial symbol position of the additional DMRS by N symbols, the UE may determine a symbol position of the additional DMRS that is offset by N symbols as the symbol position of the additional DMRS.

Or, if the gNB shifts the initial symbol position of the additional DMRS by N symbols from the starting symbol of the PDSCH of the downlink initial slot, the UE may determine, as the symbol position of the additional DMRS, a symbol position obtained by shifting the initial symbol position of the additional DMRS by N symbols from the starting symbol of the PDSCH of the downlink initial slot.

Alternatively still, if the gNB places the additional DMRS in the downlink initial slot based on an initial symbol position of the additional DMRS, the UE determines the initial symbol position of the additional DMRS as the symbol position of the additional DMRS.

Still alternatively, if the gNB shifts the initial symbol position of the additional DMRS by M symbols from the starting symbol of the downlink initial slot, the UE may determine, as the symbol position of the additional DMRS, a symbol position obtained by shifting the symbol position of the additional DMRS by M symbols from the starting symbol of the downlink initial slot, where M is a symbol index of the initial symbol position of the additional DMRS, and M is a positive integer.

In a specific implementation, the gNB may place the preamble DMRS at a start position of the downlink initial slot, and at this time, the UE may determine the start position of the downlink initial slot as a symbol position of the preamble DMRS. Further, the particular DMRS may further include an additional DMRS, and the UE may determine an initial symbol position of the additional DMRS as an actual symbol position of the additional DMRS if the gNB places the additional DMRS in the downlink initial slot based on the initial symbol position of the additional DMRS.

In a specific implementation, if the gNB selects a preset number of additional DMRSs from the candidate additional DMRSs that can be configured by the higher layer signaling, and places the additional DMRS in the downlink initial time slot according to symbol positions of the selected additional DMRSs, the UE may determine the symbol positions of the additional DMRSs based on the preset number of additional DMRSs determined by the network and the symbol positions of the additional DMRSs selected by the network, accordingly;

wherein the preset number of additional DMRSs and the symbol positions of the additional DMRSs are selected by the network from candidate additional DMRSs configurable by the higher layer signaling.

As a non-limiting example, the preset number is 2, the symbol positions of the selected additional DMRS are symbol 7 and symbol 11, and the UE may determine symbol 7 and symbol 11 of the initial downlink time slot as the symbol positions of the additional DMRS.

Further, when the UE de-maps the PDSCH data, the un-mapped PDSCH data is ignored.

Those skilled in the art understand that the steps S601 to S602 can be regarded as execution steps corresponding to the steps S101 to S103 described in the above embodiment shown in fig. 1, and the two steps are complementary in specific implementation principle and logic. Therefore, the explanation of the terms in the present embodiment may refer to the description of the embodiments shown in fig. 1 to fig. 5, and will not be repeated here.

Fig. 7 is a schematic structural diagram of a PDSCH configuring device according to an embodiment of the present invention, where the PDSCH configuring device 7 (for simplicity, referred to as the configuring device 7) may be used to implement the method technical solutions shown in fig. 1 to fig. 5, and is executed by a network layer, for example, NR gNB.

Specifically, the configuring device 7 may include a determining module 71, adapted to determine, according to an access time of accessing the unlicensed spectrum, a duration of a downlink initial time slot and a PDSCH mapping type adopted by the downlink initial time slot; a mapping module 72, if the PDSCH mapping type is type a and the downlink initial slot does not include an initial symbol of a pre-DMRS, the mapping module 72 is adapted to adjust an initial symbol position of a specific DMRS in a maximum possible duration of the downlink initial slot, so as to attempt to place the specific DMRS in the downlink initial slot and map PDSCH data into the downlink initial slot except for the symbol used by the specific DMRS; a transmitting module 73, adapted to transmit the specific DMRS and PDSCH data to the user equipment, wherein the specific DMRS includes at least one of: preamble DMRS, additional DMRS.

In a specific implementation, the configuration device 7 may further include: a configuring module 74, adapted to configure an initial symbol position of the specific DMRS based on a maximum possible duration of the downlink initial slot before determining the duration of the downlink initial slot.

In a specific implementation, the specific DMRS may include a preamble DMRS, and the mapping module 72 may include: a first shifting sub-module 721, configured to shift, by N symbols from a starting symbol of the PDSCH of the downlink initial slot, an initial symbol position of the preamble DMRS, where N is a symbol index of the initial symbol position of the preamble DMRS, and N is a positive integer.

In a specific implementation, the specific DMRS may further include an additional DMRS, and the mapping module 72 may further include: a second offset submodule 722 adapted to offset the initial symbol position of the additional DMRS by N symbols.

In a specific implementation, the specific DMRS may further include an additional DMRS, and the mapping module 72 may further include: a third shifting submodule 723, adapted to shift the initial symbol position of the additional DMRS by N symbols from the starting symbol of the PDSCH of the downlink initial slot.

In a specific implementation, the specific DMRS may further include an additional DMRS, and the mapping module 72 may further include: a first placing submodule 724, adapted to place the additional DMRS in the downlink initial slot based on an initial symbol position of the additional DMRS.

In a specific implementation, the specific DMRS may further include an additional DMRS, and the mapping module 72 may further include: a fourth shifting submodule 725, configured to shift, by M symbols from a starting symbol of the downlink initial slot, an initial symbol position of the additional DMRS, where M is a symbol index of the initial symbol position of the additional DMRS, and M is a positive integer.

As a variation, the specific DMRS may include a preamble DMRS, and the mapping module 72 may include: a second inserting submodule 726, adapted to place the preamble DMRS at the start position of the downlink initial time slot.

Further, the specific DMRS may further include an additional DMRS, and the mapping module 72 may further include: a third inserting sub-module 727, adapted to place the additional DMRS in the downlink initial time slot based on an initial symbol position of the additional DMRS.

As a further variation, the mapping module 72 may include: the sub-module 228 is configured. If the higher layer signaling is not configured with the additional DMRS, the configuration sub-module 728 is adapted to select a preset number of additional DMRS from the candidate additional DMRS that can be configured by the higher layer signaling, and place the additional DMRS in the downlink initial time slot according to the symbol position of the selected additional DMRS.

As a specific embodiment, the preset number is 2, the symbol positions of the selected additional DMRS are symbol 7 and symbol 11, and the configuration sub-module 728 is adapted to place the additional DMRS at symbol 7 and symbol 11 of the downlink initial slot.

In a specific implementation, the mapping module 72 may further include: a mapping submodule 729, adapted to map PDSCH data into PDSCH symbols of the downlink initial timeslot and discard the unmapped PDSCH data.

In a specific implementation, the configuring device 7 may further include a placing module 75, before transmitting the specific DMRS and PDSCH data to the user equipment, if the PDSCH mapping type is type a and the downlink initial slot includes the initial symbol of the preamble DMRS, the placing module 75 is adapted to place the preamble DRMS in the downlink initial slot based on the initial symbol position of the preamble DMRS.

For more contents of the working principle and the working mode of the configuration device 7, reference may be made to the related description in fig. 1 to fig. 5, and details are not repeated here.

Thus, according to the technical scheme provided by the embodiment of the invention, when the PDSCH mapping type in the downlink initial time slot is type a, at least the pre-DMRS or the additional DMRS and the PDSCH data can be sent to the UE together, so that the UE can decode the PDSCH.

Fig. 8 is a schematic structural diagram of a PDSCH receiving apparatus according to an embodiment of the present invention. The PDSCH receiving device 8 (for simplicity, referred to as the receiving device 8) may be implemented by the UE to implement the method solutions shown in fig. 2 to 6.

Specifically, the receiving apparatus 8 may include: a receiving module 81, adapted to receive specific DMRS and PDSCH data from a network based on a downlink initial timeslot, where a duration of the downlink initial timeslot and a PDSCH mapping type adopted by the downlink initial timeslot are both determined according to an access time for accessing an unlicensed spectrum; a demapping module 82, if the PDSCH mapping type is type a and the downlink initial slot does not include the initial symbol of the pre-DMRS, the demapping module 82 is adapted to demapp PDSCH data mapped to the downlink initial slot, based on the specific DMRS in the downlink initial slot, except for the symbol used by the specific DMRS; wherein the specific DMRS includes at least one of: preamble DMRS, additional DMRS.

In a specific implementation, the receiving apparatus 8 may further include a first determining module 83, adapted to determine, before receiving the specific DMRS and PDSCH data from the network, an initial symbol position of the specific DMRS based on a maximum possible duration of a downlink initial slot.

In a specific implementation, the receiving apparatus 8 may further include a second determining module 84, and before demapping PDSCH data mapped to a downlink initial slot other than symbols used by the specific DMRS, if the specific DMRS is in the downlink initial slot, the second determining module 84 is adapted to determine a symbol position of the specific DMRS in the downlink initial slot.

In a specific implementation, the specific DMRS may include a preamble DMRS, and the second determining module 84 may include: a first determining submodule 841, configured to determine, from a starting symbol of the PDSCH of the downlink initial time slot, a symbol position obtained by offsetting the initial symbol position of the pre-DMRS by N symbols as the symbol position of the pre-DMRS, where N is a symbol index of the initial symbol position of the pre-DMRS, and N is a positive integer.

In a specific implementation, the specific DMRS may further include an additional DMRS, and the second determining module 84 may include: a second determining submodule 842 adapted to determine a symbol position obtained by offsetting the symbol position of the additional DMRS by N symbols as the symbol position of the additional DMRS.

As a variation, the specific DMRS may further include an additional DMRS, and the second determining module 84 may further include: a third determining submodule 843, configured to determine, from the starting symbol of the PDSCH of the downlink initial time slot, a symbol position obtained by offsetting the initial symbol position of the additional DMRS by N symbols as the symbol position of the additional DMRS.

As another variation, the specific DMRS may further include an additional DMRS, and the second determining module 84 may further include: a fourth determining sub-module 844 adapted to determine an initial symbol position of the additional DMRS as a symbol position of the additional DMRS.

As still another variation, the specific DMRS further includes an additional DMRS, and the second determining module 84 further includes: a fifth determining submodule 845, configured to determine, from the starting symbol of the downlink initial time slot, a symbol position obtained by offsetting the symbol position of the additional DMRS by M symbols as the symbol position of the additional DMRS, where M is a symbol index of the initial symbol position of the additional DMRS, and M is a positive integer.

As an alternative embodiment, the specific DMRS may include a preamble DMRS, and the second determining module 84 may further include: a sixth determining submodule 846, configured to determine the starting symbol position of the downlink initial slot as the symbol position of the preamble DMRS.

Further, the specific DMRS may further include an additional DMRS, and the second determining module 84 may further include: a seventh determining sub-module 847 adapted to determine an initial symbol position of the additional DMRS as a symbol position of the additional DMRS.

As yet another alternative embodiment, the second determining module 84 may further include: an eighth determination submodule 848. If no additional DMRS is configured for higher layer signaling, the implement eighth determination submodule 848 is adapted to determine symbol positions of the additional DMRS based on a preset number of additional DMRS determined by the network and symbol positions of additional DMRS selected by the network; and the symbol positions of the preset number of additional DMRSs and the additional DMRS are selected by the network from candidate additional DMRSs which can be configured by the high-layer signaling.

In a specific implementation, the preset number may be 2, the symbol positions of the selected additional DMRS may be symbol 7 and symbol 11, and the eighth determining submodule 848 is further adapted to determine the symbol 7 and symbol 11 of the downlink initial slot as the symbol positions of the additional DMRS.

In a specific implementation, the receiving device 8 may further include: a third determination module 85. If the PDSCH mapping type is type a and the downlink initial slot includes the initial symbol of the pre-DMRS, the third determining module 85 is adapted to determine the initial symbol position of the pre-DMRS as the symbol position of the pre-DRMS.

In a specific implementation, the demapping module 82 is further adapted to ignore unmapped PDSCH data when demapping the PDSCH data.

For more contents of the operation principle and the operation manner of the receiving apparatus 8, reference may be made to the related description in fig. 2 to fig. 6, which is not repeated herein.

The signaling interaction between the base station and the UE in the NR system according to the embodiment of the present invention is further described below with reference to a typical application scenario.

FIG. 9 is a flow diagram illustrating data interaction in an exemplary scenario, in accordance with an embodiment of the invention. In a typical application scenario, referring to fig. 9, a base station 1 and a user equipment 2 attempt NR-U communication.

Specifically, the base station 1 first performs operation s1, that is, the base station 1 transmits configuration information to the user equipment 2, where the configuration information includes an initial symbol position of a preamble DMRS configured based on a maximum possible duration of a downlink initial slot. Preferably, the base station 1 may also configure the symbol positions of the additional DMRS of the PDSCH by using RRC signaling.

Further, the base station 1 may perform operation s2, that is, according to the access time of accessing the unlicensed spectrum, determine a duration of the downlink initial time slot, and determine a PDSCH mapping type adopted by the downlink initial time slot.

If the PDSCH mapping type is type a and the downlink initial slot does not include the initial symbol of the preamble DMRS, the base station 1 may adjust the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot to attempt to place the specific DMRS in the downlink initial slot. In addition, the base station 1 may map PDSCH data into a downlink initial slot other than the symbols used by the specific DMRS.

Further, the base station 1 may perform operation s3, that is, transmit the specific DMRS and PDSCH data placed in the downlink initial slot to the user equipment 2.

Further, the user equipment 2 may perform operation s4, that is, receive the specific DMRS and PDSCH data of the downlink initial time slot, determine the symbol positions of the preamble DMRS and/or the additional DMRS based on the specific symbol position adjusted by the base station 1, and then de-map the PDSCH data according to the specific DMRS.

For more contents of the working principles and working modes of the base station 1 and the user equipment 2 in the application scenario shown in fig. 9, reference may be made to the related descriptions in fig. 1 to fig. 6, which are not repeated herein.

Further, the embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the technical solutions of the methods in the embodiments shown in fig. 1 to fig. 6 are executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The computer readable storage medium may include ROM, RAM, magnetic or optical disks, and the like.

Further, the embodiment of the present invention further discloses a base station, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the technical solutions of the methods in the embodiments shown in fig. 1 to 5 when executing the computer instructions. Specifically, the base station may be an NR gbb.

Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the technical solution of the method in the embodiments shown in fig. 2 to 6 when running the computer instruction.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

Claims

1. A method for configuring a PDSCH, the method comprising:

determining the duration of a downlink initial time slot according to the access time of accessing the unlicensed spectrum, and determining the PDSCH mapping type adopted by the downlink initial time slot;

If the PDSCH mapping type is type A and the downlink initial time slot does not comprise the initial symbol of the preposed DMRS, adjusting the initial symbol position of a specific DMRS in the maximum possible time length of the downlink initial time slot so as to try to place the specific DMRS in the downlink initial time slot and map PDSCH data into the downlink initial time slot except the symbol used by the specific DMRS;

transmitting the specific DMRS and PDSCH data to a user equipment, wherein the specific DMRS at least comprises one of the following: preamble DMRS, additional DMRS.

2. The method according to claim 1, wherein before determining the duration of the downlink initial timeslot, further comprising:

and configuring the initial symbol position of the specific DMRS based on the maximum possible duration of the downlink initial time slot.

3. The method of claim 1, wherein the specific DMRS comprises a preamble DMRS, and wherein the adjusting the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot comprises:

and shifting the initial symbol position of the preposed DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot, wherein N is a symbol index of the initial symbol position of the preposed DMRS, and N is a positive integer.

4. The method of configuration according to claim 3, wherein the specific DMRS further includes an additional DMRS, and wherein the adjusting the initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot further comprises:

offsetting an initial symbol position of the additional DMRS by N symbols.

5. The method of claim 3, wherein the specific DMRS further includes an additional DMRS, and wherein adjusting the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot further comprises:

and shifting the initial symbol position of the additional DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot.

6. The method of claim 3, wherein the specific DMRS further includes an additional DMRS, and wherein adjusting the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot further comprises:

placing the additional DMRS in the downlink initial slot based on an initial symbol position of the additional DMRS.

7. The method of configuration according to claim 3, wherein the specific DMRS further includes an additional DMRS, and wherein the adjusting the initial symbol position of the specific DMRS in a maximum possible duration of the downlink initial slot further comprises:

And offsetting the initial symbol position of the additional DMRS by M symbols from the initial symbol of the downlink initial slot, wherein M is a symbol index of the initial symbol position of the additional DMRS, and M is a positive integer.

8. The method of claim 1, wherein the specific DMRS comprises a preamble DMRS, and wherein the adjusting the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot comprises:

and placing the pre-DMRS at the initial position of the downlink initial time slot.

9. The method of configuring of claim 8, wherein the specific DMRS further comprises an additional DMRS, and wherein the adjusting of the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot further comprises:

10. The method of claim 1, wherein the adjusting the initial symbol position of the specific DMRS in the maximum possible duration of the downlink initial slot comprises:

and if the high-level signaling is not configured with the additional DMRS, selecting a preset number of additional DMRSs from the candidate additional DMRSs which can be configured by the high-level signaling, and placing the additional DMRS in the downlink initial time slot according to the symbol position of the selected additional DMRS.

11. The method of claim 10, wherein the preset number is 2, wherein the symbol positions of the selected additional DMRS are symbol 7 and symbol 11, and wherein the placing the additional DMRS in the downlink initial slot according to the symbol positions of the selected additional DMRS comprises:

and placing the additional DMRS in a symbol 7 and a symbol 11 of the downlink initial time slot.

12. The method of configuration according to any of claims 1 to 11, further comprising, before transmitting the specific DMRS and PDSCH data to a user equipment:

and if the PDSCH mapping type is type A and the downlink initial time slot comprises the initial symbol of the preposed DMRS, placing the preposed DMRS in the downlink initial time slot based on the initial symbol position of the preposed DMRS.

13. The method of claim 12, wherein the mapping the PDSCH data into a downlink initial slot excluding the symbols used by the specific DMRS comprises:

and mapping the PDSCH data to PDSCH symbols of the downlink initial time slot, and discarding the non-mapped PDSCH data.

14. A method of receiving a PDSCH, comprising:

Receiving specific DMRS (demodulation reference signal) and PDSCH (physical downlink shared channel) data from a network based on a downlink initial time slot, wherein the duration of the downlink initial time slot and the PDSCH mapping type adopted by the downlink initial time slot are determined according to the access time of accessing an unlicensed spectrum;

if the PDSCH mapping type is type A and the downlink initial time slot does not comprise the initial symbol of the preposed DMRS, the PDSCH data mapped to the downlink initial time slot except the symbol used by the specific DMRS is subjected to demapping based on the specific DMRS in the downlink initial time slot;

wherein the specific DMRS includes at least one of: preamble DMRS, additional DMRS.

15. The receiving method of claim 14, further comprising, prior to receiving the specific DMRS and PDSCH data from the network:

and determining the initial symbol position of the specific DMRS based on the maximum possible duration of the downlink initial time slot.

16. The receiving method according to claim 14, wherein prior to demapping PDSCH data mapped into a downlink initial slot other than the symbol used by the specific DMRS, further comprising:

and if the specific DMRS is in the downlink initial time slot, determining the symbol position of the specific DMRS in the downlink initial time slot.

17. The receiving method of claim 16, wherein the specific DMRS comprises a preamble DMRS, and wherein the determining the symbol position of the specific DMRS in the downlink initial slot comprises: determining a symbol position obtained by offsetting the initial symbol position of the pre-DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot as the symbol position of the pre-DMRS, wherein N is a symbol index of the initial symbol position of the pre-DMRS, and N is a positive integer.

18. The receiving method of claim 17, wherein the specific DMRS further comprises an additional DMRS, and wherein the determining the symbol position of the specific DMRS in the downlink initial slot comprises: and determining a symbol position obtained by offsetting the symbol position of the additional DMRS by N symbols as the symbol position of the additional DMRS.

19. The receiving method of claim 17, wherein the specific DMRS further comprises an additional DMRS, and wherein the determining the symbol position of the specific DMRS in the downlink initial slot comprises: and determining a symbol position obtained by offsetting the initial symbol position of the additional DMRS by N symbols from the initial symbol of the PDSCH of the downlink initial time slot as the symbol position of the additional DMRS.

20. The receiving method of claim 17, wherein the specific DMRS further comprises an additional DMRS, and wherein the determining the symbol position of the specific DMRS in the downlink initial slot comprises: determining an initial symbol position of the additional DMRS as a symbol position of the additional DMRS.

21. The receiving method of claim 17, wherein the specific DMRS further comprises an additional DMRS, and wherein the determining the symbol position of the specific DMRS in the downlink initial slot comprises: and determining a symbol position obtained by offsetting the symbol position of the additional DMRS by M symbols from the initial symbol of the downlink initial time slot as the symbol position of the additional DMRS, wherein M is a symbol index of the initial symbol position of the additional DMRS, and M is a positive integer.

22. The receiving method of claim 16, wherein the specific DMRS comprises a preamble DMRS, and wherein the determining the symbol position of the specific DMRS in the downlink initial slot comprises: and determining the initial symbol position of the downlink initial time slot as the symbol position of the preposed DMRS.

23. The receiving method of claim 22, wherein the specific DMRS further comprises an additional DMRS, and wherein the determining the symbol position of the specific DMRS in the downlink initial slot comprises: determining an initial symbol position of the additional DMRS as a symbol position of the additional DMRS.

24. The receiving method of claim 16, wherein the determining the symbol position of the specific DMRS in the downlink initial slot comprises:

if the higher-layer signaling is not configured with the additional DMRS, determining symbol positions of the additional DMRS based on a preset number of additional DMRSs determined by the network and the symbol positions of the additional DMRS selected by the network;

25. The receiving method of claim 24, wherein the preset number is 2, wherein the selected symbol positions of the additional DMRS are symbol 7 and symbol 11, and wherein the determining the symbol positions of the additional DMRS comprises:

and determining a symbol 7 and a symbol 11 of the downlink initial time slot as symbol positions of the additional DMRS.

26. The receiving method according to any one of claims 15 to 25, further comprising, before demapping PDSCH data mapped into a downlink initial slot other than the symbol used by the specific DMRS:

and if the PDSCH mapping type is type A and the downlink initial time slot comprises the initial symbol of the preposed DMRS, determining the initial symbol position of the preposed DMRS as the symbol position of the preposed DMRS.

27. The receiving method as claimed in claim 26, further comprising:

and when the PDSCH data are demapped, ignoring the unmapped PDSCH data.

28. An apparatus for configuring a PDSCH, comprising:

the determining module is suitable for determining the duration of a downlink initial time slot according to the access time of accessing the unlicensed spectrum and determining the PDSCH mapping type adopted by the downlink initial time slot;

a mapping module, adapted to adjust an initial symbol position of a specific DMRS in a maximum possible duration of the downlink initial slot to attempt to place the specific DMRS in the downlink initial slot and map PDSCH data into the downlink initial slot except for a symbol used by the specific DMRS, if the PDSCH mapping type is type a and the downlink initial slot does not include an initial symbol of a preamble DMRS;

a transmitting module adapted to transmit the specific DMRS and PDSCH data to a user equipment, wherein the specific DMRS includes at least one of: preamble DMRS, additional DMRS.

29. An apparatus for receiving a PDSCH, comprising:

the receiving module is suitable for receiving specific DMRS and PDSCH data from a network based on a downlink initial time slot, and the duration of the downlink initial time slot and the PDSCH mapping type adopted by the downlink initial time slot are both determined according to the access time of accessing the unlicensed spectrum;

A demapping module, adapted to, if a PDSCH mapping type is type a and the downlink initial slot does not include an initial symbol of a pre-DMRS, demap PDSCH data mapped to the downlink initial slot other than a symbol used by a specific DMRS based on the specific DMRS in the downlink initial slot;

30. A storage medium having stored thereon computer instructions which, when executed, perform the steps of the method of any of claims 1 to 13 or any of claims 14 to 27.

31. A base station comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 1 to 13.

32. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 14 to 27.