CN113922921A

CN113922921A - DMRS mapping position determining method and device, storage medium and terminal

Info

Publication number: CN113922921A
Application number: CN202010658002.5A
Authority: CN
Inventors: 周欢
Original assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Current assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2022-01-11

Abstract

A method and a device for determining the mapping position of DMRS, a storage medium and a terminal are provided, the method comprises the following steps: determining the number of DMRS and the number of PUSCH transmission repetition times; and determining the mapping positions of one or more DMRSs on one or more PUSCHs according to at least the size relation between the DMRS number and the PUSCH transmission repetition number so as to enable the one or more DMRSs to be substantially uniformly distributed on the one or more PUSCHs. According to the scheme of the invention, the positions of the DMRS in different repeated PUSCHs can be flexibly determined under the scene of repeatedly performing uplink transmission for multiple times.

Description

DMRS mapping position determining method and device, storage medium and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a mapping position of a DMRS, a storage medium, and a terminal.

Background

Due to the limited uplink power, uplink transmission needs to enhance coverage in many scenarios. A common method for existing coverage enhancement is to repeat uplink transmission several times, and in the scenario of performing uplink transmission repeatedly for multiple times, the time domain position of a channel Demodulation Reference Signal (DMRS for short) can be reduced, so as to reserve more resources for uplink data transmission.

In order to indicate the mapping positions of the reduced DMRSs on a Physical Uplink Shared Channel (PUSCH), an indication method in the prior art directly configures transmission density, where DMRSs exist on each of a plurality of PUSCHs, and DMRSs do not exist on other PUSCHs.

However, this scheme of configuring a fixed transmission density has a disadvantage of inflexibility. Because the PUSCH duration is flexibly scheduled, a single configuration DMRS density cannot adapt to the flexibility of the PUSCH.

Disclosure of Invention

The technical problem solved by the invention is how to flexibly determine the positions of DMRS on different repeated PUSCHs under the scene of repeatedly performing uplink transmission for multiple times.

In order to solve the above technical problem, an embodiment of the present invention provides a method for determining a mapping position of a DMRS, including: determining the number of DMRS and the number of PUSCH transmission repetition times; and determining the mapping positions of one or more DMRSs on one or more PUSCHs according to at least the size relation between the DMRS number and the PUSCH transmission repetition number so as to enable the one or more DMRSs to be substantially uniformly distributed on the one or more PUSCHs.

Optionally, for the PUSCHs mapped to the DMRS in the one or more PUSCHs, the more the former PUSCHs are mapped to the DMRS.

Optionally, the determining, according to at least a size relationship between the number of DMRSs and the number of PUSCH transmission repetitions, mapping positions of one or more DMRSs on one or more PUSCHs includes: when the PUSCH transmission repetition times is more than or equal to the DMRS number, dividing the one or more PUSCHs into a first part PUSCH and a second part PUSCH; mapping a portion of the one or more DMRSs to the first partial PUSCH at a first density and mapping a remaining portion of the one or more DMRSs to the second partial PUSCH at a second density, wherein the first density is greater than or equal to the second density.

Optionally, the first density is obtained by rounding down a ratio of the PUSCH transmission repetition number to the DMRS number, and the second density is obtained by rounding up a ratio of the PUSCH transmission repetition number to the DMRS number.

Optionally, the first portion of PUSCH is divided into at least one PUSCH group according to the first density, and the first portion of PUSCH includes a number of PUSCH groups that is a difference between the number of DMRS and the number of PUSCHs that are not mapped to DMRS when the one or more DMRS are equally allocated; and dividing the second part of PUSCH into at least one PUSCH group according to the second density, wherein the number of PUSCH groups included in the second part of PUSCH is the number of PUSCHs which are not mapped to the DMRS when the one or more DMRSs are averagely allocated.

Optionally, the mapping, at the first density, a portion of the one or more DMRSs to the first partial PUSCH comprises: dividing the first portion of PUSCH into at least one PUSCH group according to the first density and mapping a portion of the one or more DMRSs to a first PUSCH in each PUSCH group; the mapping remaining portions of the one or more DMRSs to the second partial PUSCHs at the second density comprises: dividing the second partial PUSCH into at least one PUSCH group according to the second density, and mapping a remaining portion of the one or more DMRSs to a first PUSCH in each PUSCH group.

Optionally, the mapping a portion of the one or more DMRSs to a first PUSCH in each PUSCH group comprises: when intra-slot frequency hopping exists, mapping a part of the one or more DMRSs to each frequency hopping part of a first PUSCH in each PUSCH group; the mapping the remaining portion of the one or more DMRSs to a first PUSCH in each PUSCH group comprises: when there is intra-slot frequency hopping, mapping the remaining portion of the one or more DMRSs to each frequency-hopped portion of a first PUSCH in each PUSCH group.

Optionally, the determining, according to at least a size relationship between the number of DMRSs and the number of PUSCH transmission repetitions, mapping positions of one or more DMRSs on one or more PUSCHs includes: when the PUSCH transmission repetition times is less than the DMRS number, dividing the one or more PUSCHs into a third portion PUSCH and a fourth portion PUSCH; mapping a first number of DMRS to each PUSCH in the third portion of PUSCHs, and mapping a second number of DMRS to each PUSCH in the fourth portion of PUSCHs, wherein the first number is greater than or equal to the second number.

Optionally, the first number is calculated based on the following formula: number1 ═ min (pos +1, ceil (M/NX)); wherein number1 is the first number; the min () function is a minimum function; pos is the number of additional DMRS; ceil () function is rounded up to the nearest integer; m is the DMRS number; NX is the PUSCH transmission repetition number; the second quantity is calculated based on the following formula: number2 ═ min (pos +1, floor (M/NX)); wherein number2 is the second number; the floor () function is rounded down to the nearest integer.

Optionally, the PUSCH transmission repetition number is selected from: the number of PUSCH transmission repetitions for dynamic scheduling, the number of PUSCH transmission repetitions for configuration grant, the number of PUSCH transmission repetitions for actual transmission, and the number of PUSCH transmission repetitions within a single hopping part.

Optionally, the DMRS number is a total number of DMRSs within a total transmission duration of the PUSCH or a DMRS number occupied by a single frequency hopping part.

Optionally, when the DMRSs are dual-symbol DMRSs, the mapping positions of the one or more DMRSs on the one or more PUSCHs determined according to the size relationship between the number of the DMRSs and the number of the PUSCH transmission repetitions refer to starting time domain symbol positions of the one or more dual-symbol DMRSs on the one or more PUSCHs.

Optionally, the determining the DMRS number includes: and searching a preset configuration table according to part or all of parameters in the PUSCH duration, the PUSCH mapping type, the PUSCH repetition times, the DMRS type and the frequency hopping type to determine the DMRS number, wherein the preset configuration table records different PUSCH durations, PUSCH mapping types, PUSCH repetition times, DMRS types and DMRS numbers associated with the frequency hopping types.

In order to solve the above technical problem, an embodiment of the present invention further provides an apparatus for determining a mapping position of a DMRS, including: the first determining module is used for determining the DMRS number and the PUSCH transmission repetition number; a second determining module, configured to determine mapping positions of one or more DMRSs on one or more PUSCHs according to at least a size relationship between the number of DMRSs and the PUSCH transmission repetition number, so that the one or more DMRSs are substantially uniformly distributed on the one or more PUSCHs.

To solve the above technical problem, an embodiment of the present invention further provides a storage medium, on which a computer program is stored, and the computer program executes the steps of the above method when being executed by a processor.

In order to solve the above technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the steps of the method when running the computer program.

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 method for determining the mapping position of a DMRS (demodulation reference signal), which comprises the following steps: determining the number of DMRS and the number of PUSCH transmission repetition times; and determining the mapping positions of one or more DMRSs on one or more PUSCHs according to at least the size relation between the DMRS number and the PUSCH transmission repetition number so as to enable the one or more DMRSs to be substantially uniformly distributed on the one or more PUSCHs.

Compared with the prior technical scheme of configuring single transmission density to indicate the position of the DMRS on the PUSCH, the scheme of the embodiment can flexibly determine the positions of the DMRS on different repeated PUSCHs under the scene of repeatedly performing uplink transmission for multiple times. Specifically, the mapping position of the DMRS on the PUSCH is flexibly determined according to the number of the DMRS and the transmission repetition number of the PUSCH, so that the mapping of the DMRS can adapt to various PUSCH repeated configuration scenes, such as different PUSCH duration. Further, while the DMRS can be flexibly mapped to the PUSCH scheduled or configured at this time, it is ensured that the DMRS is distributed on the PUSCH as uniformly as possible, so as to improve the success rate of receiving the DMRS by the UE.

Drawings

Fig. 1 is a flowchart of a method for determining a mapping position of a DMRS according to an embodiment of the present invention;

FIG. 2 is a flowchart of one embodiment of step S102 of FIG. 1;

FIG. 3 is a time domain resource diagram of a first exemplary application scenario in accordance with the present invention;

FIG. 4 is a time domain resource diagram of a second exemplary application scenario in accordance with the present invention;

FIG. 5 is a time domain resource diagram of a third exemplary application scenario in accordance with the present invention;

FIG. 6 is a flow diagram of another embodiment of step S102 of FIG. 1;

FIG. 7 is a time domain resource diagram of a fourth exemplary application scenario in accordance with the present invention;

FIG. 8 is a time domain resource diagram of a fifth exemplary application scenario in accordance with the present invention;

FIG. 9 is a time domain resource diagram of a sixth exemplary application scenario in accordance with the present invention;

FIG. 10 is a time domain resource diagram of a seventh exemplary application scenario in accordance with an embodiment of the present invention;

FIG. 11 is a time domain resource diagram of an eighth exemplary application scenario in accordance with the present invention;

FIG. 12 is a time domain resource diagram of a ninth exemplary application scenario in accordance with the present invention;

fig. 13 is a schematic structural diagram of an apparatus for determining a mapping position of a DMRS according to an embodiment of the present invention.

Detailed Description

As described in the background, for a scenario in which uplink transmission is repeated multiple times, it is necessary to indicate a time domain position of a reduced DMRS. However, the mapping method with a single transmission density adopted in the prior art has poor flexibility and cannot adapt to the PUSCH duration with flexible scheduling.

According to the scheme, the positions of the DMRS in different repeated PUSCHs can be flexibly determined under the scene of repeated uplink transmission for multiple times. Specifically, the mapping position of the DMRS on the PUSCH is flexibly determined according to the number of the DMRS and the transmission repetition number of the PUSCH, so that the mapping of the DMRS can adapt to various PUSCH repeated configuration scenes, such as different PUSCH duration.

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 of a method for determining a mapping position of a DMRS according to an embodiment of the present invention.

The embodiment can be applied to the uplink transmission enhanced coverage scenario, for example, more resources are reserved for uplink repeated transmission by reducing the time domain position of the DMRS. The present embodiment may be executed by a User Equipment side, for example, by a User Equipment (User Equipment, abbreviated as UE) on the User Equipment side.

Specifically, referring to fig. 1, the method for determining the mapping position of the DMRS according to this embodiment may include the following steps:

step S101, determining the number of DMRS and the transmission repetition times of PUSCH;

and step S102, determining the mapping positions of one or more DMRSs on one or more PUSCHs according to the size relation between the DMRS number and the PUSCH transmission repetition number at least, so that the one or more DMRSs are basically and uniformly distributed on the one or more PUSCHs.

In one implementation, the DMRS number may refer to a total number of DMRS within a PUSCH total transmission duration, such as a total number of DMRS symbols within all PUSCH transmission durations configured by a higher layer parameter. For convenience of description, this embodiment will refer to the DMRS number as M. The number of DMRS symbols is the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the DMRS in the time domain.

In a variation, when there is intra-slot Frequency Hopping (FH) or inter-slot Frequency Hopping, the number of DMRS may refer to the number of DMRS occupied by a single Hopping part. For example, the total number of DMRS symbols in all PUSCH transmission durations configured by the higher layer parameter is denoted as M ', the number of DMRS symbols occupied by each frequency hopping part in the previous frequency hopping or multiple frequency hopping is ceil (M'/n), where the ceil () function is rounded up to the nearest integer, and n is the number of frequency hopping parts; and in the last time or multiple times of frequency hopping, the number M of the DMRS symbols occupied by each frequency hopping part is floor (M'/n), wherein the floor () function is rounded down to the nearest integer.

Thereby, the earlier hopping part can be made to map more DMRS symbols.

Taking 2 hopping parts as an example, the number of DMRS symbols occupied by the first hop is defined as M ═ ceil (M '/2), and the number of DMRS symbols occupied by the second hop is defined as M ═ floor (M'/2).

In one specific implementation, the determining the DMRS number in step S101 may include the steps of: according to part or all of parameters in the PUSCH duration (duration), the PUSCH mapping type (mapping type), the PUSCH repetition (repetition) times, the DMRS type and the frequency hopping type, searching a preset configuration table to determine the DMRS number, wherein the preset configuration table records DMRS numbers associated with different PUSCH durations, PUSCH mapping types, PUSCH repetition times, DMRS types and frequency hopping types.

Wherein, the DMRS types may include a dual-symbol DMRS (double symbol DMRS) and a single-symbol DMRS (single symbol DMRS); the hopping type may include whether to hop, and if so, whether to hop intra-slot or inter-slot.

TABLE 1 Preset configuration Table

For example, the higher layer signaling may configure the M value in a table manner for different PUSCH repetition times, PUSCH mapping types, PUSCH durations, additional DMRS symbols (additional DMRS symbols), and combination conditions of dual-symbol DMRS or single-symbol DMRS, as shown in table 1. It should be noted that table 1 only shows a partial association relationship between the combination condition and the M value, which may be configured in practical applications.

In a variation, the value of M may be directly configured by the base station and indicated to the UE through higher layer signaling, dedicated signaling, and the like.

In one implementation, the PUSCH transmission repetition number may be a dynamically scheduled PUSCH transmission repetition number or a configured grant PUSCH transmission repetition number. For example, the number of repeated transmissions in the PUSCH repetition type a (abbreviated as type a) is denoted as NA. For another example, the number of repeated transmissions in PUSCH repetition type B (abbreviated as type B) is denoted as NB.

Specifically, the type a is repeated transmission in a slot, the number NA of repeated transmission is configured through high-layer signaling, and the PUSCH is repeatedly transmitted in NA slots, and the symbol position of transmission is the same in each slot. Accordingly, for PUSCH repetition type a, the PUSCH transmission repetition number may be equal to the PUSCH transmission slot number.

Further, in a New Radio (NR) of a protocol version (Release-16, referred to as Rel-16), in order to support an Ultra Reliable and Low Latency Communication (URLLC) scenario, a repeated transmission of a PUSCH repetition type B is supported. This type of repetitive transmission can be performed either within one slot or across slots for repeated transmission of consecutive available symbols.

In one variation, the PUSCH transmission repetition number may be a PUSCH transmission repetition number of an actual transmission.

Specifically, in each slot of the repeated transmission, if at least one symbol in one slot is a downlink symbol, the PUSCH of the slot is not transmitted. Accordingly, DMRS may be more reasonably mapped according to an actually transmitted PUSCH to avoid the DMRS being mapped to a slot in which the PUSCH is not actually transmitted.

In one variation, the PUSCH transmission repetition number may refer to the PUSCH transmission repetition number within a single hopping part when there is intra-slot hopping or inter-slot hopping. For example, the number of PUSCH transmission slots in type a scheduled or configured is denoted as NA ', and the number of PUSCH transmission slots in type B scheduled or configured is denoted as NB', then the number of PUSCH transmission repetitions in each frequency hopping part in the previous frequency hopping or multiple frequency hopping is NA ═ ceil (NA '/n), NB ═ ceil (NB'/n); and the PUSCH transmission repetition times in each frequency hopping part in the last time or a plurality of times of frequency hopping are NA & ltfloor & gt/n & ltNB & gt & ltfloor & gt/n & ltB & gt & ltn & gt & ltB & gt & ltn & gt & ltB & ltP & gt & ltB & gt & ltn & ltP & gt & ltP & gt & ltN & ltB & ltP & gt & ltP & gt & ltP & gt & ltP & gt & ltP & gt & ltS & gt & ltS & gt & ltS & gt & ltS & gt & ltS & gt & ltS & gt & ltS & gt & lt & gt & ltS & gt.

Taking 2 hopping parts as an example, the number of repetitions of the PUSCH in the first hop in type a is NA ═ ceil (NA '/2), and the number of repetitions of the PUSCH in the second hop is NA ═ floor (NA'/2). Under the type B, the number of PUSCHs in the first hop is NB tail (NB '/2), and the number of PUSCHs in the second hop is NB floor (NB'/2).

In one implementation, the mapping position of each DMRS may depend on the number of DMRSs M, the number of PUSCH transmission repetitions, NA or NB, whether frequency hopping is present, the type of frequency hopping when frequency hopping is present, and whether the DMRS is a dual-symbol DMRS or a single-symbol DMRS.

In one implementation, for a PUSCH mapped to a DMRS of the one or more PUSCHs, wherein an earlier PUSCH is mapped to more DMRS. That is, the DMRS may not be mapped on the repeated PUSCH on a complete average, but rather, the mapping of the DMRS on the earlier PUSCH may be more dense and the mapping on the later PUSCH may be somewhat less dense, while ensuring as uniform an allocation as possible.

In one implementation, referring to fig. 2, the step S102 may include the following steps:

step S1021, when the PUSCH transmission repetition times is more than or equal to the DMRS number, the one or more PUSCHs are divided into a first part PUSCH and a second part PUSCH;

step S1022, mapping a part of the one or more DMRSs to the first partial PUSCH at a first density, and mapping the remaining part of the one or more DMRSs to the second partial PUSCH at a second density, wherein the first density is greater than or equal to the second density.

Therefore, when the number of times of PUSCH transmission repetition is greater than or equal to the number of DMRSs, it is indicated that a plurality of PUSCHs are mapped to one DMRS, and therefore, M DMRSs need to be mapped to NA or NB PUSCHs at a specific density. Further, the NA or NB PUSCHs are divided into two parts, wherein the former part is denser and the latter part is sparser.

In one implementation, the first density may be rounded down by a ratio of the number of repetitions of PUSCH to the number of DMRS.

In one implementation, the second density may be rounded up by a ratio of the number of repetitions of PUSCH to the number of DMRS.

In one implementation, the first portion of PUSCH may be divided into at least one PUSCH group according to the first density. Specifically, the first portion of PUSCHs may include a number of PUSCH groups that is a difference between the number of DMRSs and a number of PUSCHs that are not mapped to DMRSs when the one or more DMRSs are equally allocated.

Specifically, when the number of times of PUSCH transmission repetition is equal to or greater than the number of DMRSs, it indicates that there must be a PUSCH that cannot be mapped to a DMRS. Therefore, the number of PUSCH groups with denser mapping can be obtained by subtracting the number of PUSCHs that are not allocated to the DMRS in the average allocation from the M value.

For example, the number of PUSCH groups included by the first partial PUSCH may be expressed based on the formula M- (NA% M). Of course, when PUSCH repetition type B is configured, the foregoing formula may be replaced with M- (NB% M). Where,% represents a modulo operation.

In one implementation, the second portion of PUSCH may be divided into at least one PUSCH group according to the second density, and the number of PUSCH groups included in the second portion of PUSCH is the number of PUSCHs that are not mapped to DMRS when the one or more DMRS are equally allocated.

For example, the number of PUSCH groups comprised by the second partial PUSCH may be expressed based on the formula NA% M. Of course, when PUSCH repetition type B is configured, the aforementioned formula may be replaced with NB% M.

In one implementation, the step S1022 may include the steps of: dividing the first portion of PUSCH into at least one PUSCH group according to the first density and mapping a portion of the one or more DMRSs to a first PUSCH in each PUSCH group; the mapping remaining portions of the one or more DMRSs to the second partial PUSCHs at the second density comprises: dividing the second partial PUSCH into at least one PUSCH group according to the second density, and mapping a remaining portion of the one or more DMRSs to a first PUSCH in each PUSCH group.

In one embodiment, for the dynamically scheduled PUSCH and the PUSCH with configuration grant, the PUSCH repetition type a and the repetition type B, PUSCH mapping type a and mapping type B, the single symbol DMRS, and the no frequency hopping case, the step S1022 may include:

and when the PUSCH transmission repetition times NA (or NB) is more than or equal to the DMRS number M, the DMRS is mapped on each first floor (NA/M) PUSCHs. Wherein each floor (NA/M) PUSCHs form a PUSCH group, and the group is M- (NA% M) in total. The M- (NA% M) group PUSCH is a PUSCH group included in the first partial PUSCH.

Further, DMRSs are mapped on the last every ceil (NA/M) PUSCHs. Wherein each ceil (NA/M) PUSCHs form a PUSCH group, and the total number of the PUSCHs is NA% M group. The NA% M PUSCH groups are PUSCH groups included in the second partial PUSCH.

Further, the DMRS is in the first PUSCH of each PUSCH group regardless of the first PUSCH portion or the second PUSCH portion, and the time domain position of the DMRS is the same as the time domain position of the DMRS under the same condition (PUSCH configuration and DMRS number) in the existing protocol.

For example, in a first typical application scenario, referring to fig. 3, it is assumed that a PUSCH repetition type a, a PUSCH mapping type a, a DMRS number M ═ 2, and a PUSCH transmission repetition number NA ═ 4. Since NA > M, the first portion of PUSCH comprises 2- (4% 2) ═ 2 PUSCH groups, and the first density floor (4/2) ═ 2. Thus, the first partial PUSCH comprises 2 PUSCH groups, wherein each of said PUSCH groups comprises 2 PUSCHs, corresponding to the PUSCHs on slot 1, slot 2, slot 3 and slot 4 in fig. 3. Correspondingly, DMRSs are mapped on every 2 PUSCHs in the first portion of PUSCHs.

Similarly, the second partial PUSCH comprises 4% 2 — 0 PUSCH groups, and the second density ceil (4/2) is 2. Thus, the second partial PUSCH comprises 0 PUSCH groups.

In the scenario shown in fig. 3, the DMRSs in the first partial PUSCH are all on the first PUSCH of each group. Thus, in fig. 3 PUSCH on slot 1 is mapped with DMRS, while PUSCH on slot 2 is not mapped with DMRS, PUSCH on slot 3 is mapped with DMRS, and PUSCH on slot 4 is not mapped with DMRS.

In the time domain resource diagram shown in this embodiment, the regions filled with oblique lines in different rows indicate the number of OFDM symbols sustained by PUSCH, and the regions filled with cross grids indicate mapped DMRSs.

For another example, in a second exemplary application scenario, referring to fig. 4, a PUSCH repetition type a, a PUSCH mapping type a, a DMRS number M of 3, and a PUSCH transmission repetition number NA of 4 are assumed. Since NA > M, the first portion of PUSCH comprises 3- (4% 3) ═ 3-1 ═ 2 PUSCH groups, and the first density floor (4/3) ═ 1. Thus, the first partial PUSCH comprises 2 PUSCH groups, and wherein each PUSCH group comprises 1 PUSCH, corresponding to the PUSCH on slot 1 and slot 2 in fig. 4. Correspondingly, DMRSs are mapped on each PUSCH in the first portion of PUSCHs.

Similarly, the second partial PUSCH comprises 4% 3 ═ 1 PUSCH groups, and the second density ceil (4/3) ═ 2. Thus, the second partial PUSCH comprises 1 PUSCH group and the PUSCH group comprises 2 PUSCHs, corresponding to the PUSCHs on slot 3 and slot 4 in fig. 4. Correspondingly, DMRSs are mapped on every 2 PUSCHs in the second partial PUSCH.

In the scenario shown in fig. 4, DMRSs in the first and second partial PUSCHs are both on the first PUSCH of each group. Thus, in fig. 4 PUSCH on slot 1 is mapped with DMRS, while PUSCH on slot 2 is mapped with DMRS, PUSCH on slot 3 is mapped with DMRS, and PUSCH on slot 4 is not mapped with DMRS.

For another example, in a third typical application scenario, referring to fig. 5, it is assumed that the PUSCH repetition type a, the PUSCH mapping type a, the DMRS number M is 2, and the PUSCH transmission repetition number NA of the actual transmission is 3 (the PUSCH of the slot cannot be transmitted because there is a downlink symbol in the slot 2). Since NA > M, the first portion of PUSCH comprises 2- (3% 2) ═ 1 PUSCH groups, and the first density floor (3/2) ═ 1. Thus, the first partial PUSCH comprises 1 PUSCH group and the PUSCH group comprises 1 actually transmitted PUSCH, corresponding to the PUSCH on slot 1 in fig. 5. Correspondingly, DMRSs are mapped on each actually transmitted PUSCH in the first portion of PUSCHs.

Similarly, the second partial PUSCH comprises 3% 2 ═ 1 PUSCH groups, and the second density ceil (3/2) ═ 2. Thus, the second partial PUSCH group comprises 1 PUSCH group and said PUSCH group comprises 2 actually transmitted PUSCHs, corresponding to the PUSCHs on slot 3 and slot 4 in fig. 5. Correspondingly, DMRSs are mapped on every 2 actual transmission PUSCHs in the second partial PUSCH.

In the scenario shown in fig. 5, DMRSs in the first and second partial PUSCHs are both on the first PUSCH of each group. Thus, in fig. 5 PUSCH on slot 1 is mapped with DMRS, while PUSCH on slot 2 is not mapped with DMRS, PUSCH on slot 3 is mapped with DMRS, and PUSCH on slot 4 is not mapped with DMRS.

In one implementation, referring to fig. 6, the step S102 may include the following steps:

step S1028, when the PUSCH transmission repetition number is smaller than the DMRS number, dividing the one or more PUSCHs into a third portion PUSCH and a fourth portion PUSCH;

step S1029, mapping a first number of DMRSs to each PUSCH in the third portion of PUSCHs, and mapping a second number of DMRSs to each PUSCH in the fourth portion of PUSCHs, wherein the first number is greater than or equal to the second number.

Thus, when the number of DMRSs is more, it indicates that each PUSCH can be mapped to at least one DMRS. Therefore, after ensuring that each PUSCH is mapped to a certain number of DMRSs, redundant DMRSs may be preferentially mapped to the preceding PUSCH.

In one implementation, the first amount may be calculated based on the following formula:

number1＝min(pos+1,ceil(M/NX))；

wherein number1 is the first number; the min () function is a minimum function; pos is the number of additional DMRS; ceil () function is rounded up to the nearest integer; m is the DMRS number; NX is the PUSCH transmission repetition number (e.g., NA or NB).

Specifically, the min (pos +1, ceil (M/NX)) may characterize the maximum number of DMRSs that can be mapped on the current PUSCH.

Further, the number of the additional DMRSs may be a configured number of additional (additional) DMRSs.

In one implementation, the second number may be calculated based on the following equation:

number2＝min(pos+1,floor(M/NX))；

wherein number2 is the second number; the floor () function is rounded down to the nearest integer.

Further, when multiple DMRSs are mapped to a PUSCH of the same slot, a mapping pattern (pattern) of the DMRSs on the PUSCH per slot may follow the related specifications of the related art.

In one implementation, the third partial PUSCH may include M% NA PUSCHs and the fourth partial PUSCH may include NA-M% NA PUSCHs.

Specifically, the PUSCH in the third partial PUSCH is additionally mapped to the DMRS based on the equally allocated DMRS, and thus the number of PUSCHs included in the third partial PUSCH is the remainder of dividing M by NA.

Further, the remaining PUSCH except the third part of the PUSCH is the fourth part of PUSCH.

For example, in a fourth exemplary application scenario, referring to fig. 7, a PUSCH repetition type a, a PUSCH mapping type a, a DMRS number M of 5, and a PUSCH transmission repetition number NA of 4 are assumed. Since M > NA, the third partial PUSCH comprises 5% 4 ═ 1 PUSCH, and the first number1 ═ min (2, ceil (5/4)) ═ 2. Therefore, the third partial PUSCH includes a PUSCH on slot 1 shown in fig. 7, and the PUSCH on slot 1 is mapped with 2 DMRSs.

Similarly, the fourth portion PUSCH includes 4- (5% 4) ═ 3 PUSCHs, and the second number2 ═ min (2, floor (5/4)) ═ 1. Therefore, the fourth portion of PUSCH includes PUSCH on slot 2, slot 3 and slot 4 shown in fig. 7, and PUSCH on each slot is mapped with 1 DMRS, respectively.

For another example, in a fifth exemplary application scenario, referring to fig. 8, it is assumed that the PUSCH repetition type a, the PUSCH mapping type a, the DMRS number M is 5, and the PUSCH transmission repetition number NA of the actual transmission is 3 (the PUSCH of the slot cannot be transmitted because there is a downlink symbol in the slot 2). Since M > NA, the third partial PUSCH comprises 5% 3 ═ 2 PUSCHs, and the first number1 ═ min (2, ceil (5/3)) ═ 2. Therefore, the third partial PUSCH includes PUSCH on slot 1 of actual transmission and slot 3 of actual transmission shown in fig. 8, and PUSCH on the two slots are mapped with 2 DMRSs, respectively.

Similarly, the fourth portion PUSCH includes 3- (5% 3) ═ 1 PUSCH, and the second number2 ═ min (2, floor (5/3)) ═ 1. Therefore, the fourth part of PUSCH comprises PUSCH on slot 4 of the actual transmission shown in fig. 8, and PUSCH on said slot 4 is mapped with 1 DMRS.

In one implementation, when there is intra-slot frequency hopping, the step S1022 may include: mapping a portion of the one or more DMRSs to each frequency hopping portion of a first PUSCH in each PUSCH group; mapping the remaining part of the one or more DMRSs to each frequency hopping part of a first PUSCH in each PUSCH group.

Specifically, when there is intra-slot frequency hopping, taking 2 parts of frequency hopping as an example, the positions and the numbers of the DMRSs in each hop are calculated for the first hop and the second hop, respectively.

The total number of DMRS symbols for which the higher layer parameters are configured in all PUSCH transmission durations is denoted as M'. The number of DMRS symbols occupied by the first hop is M ═ ceil (M '/2), and the number of DMRS symbols occupied by the second hop is M ═ floor (M'/2). Therefore, the DMRSs mapped by the first hop are distributed as uniformly as possible within each hop, and the DMRSs mapped by the second hop are slightly smaller. The DMRS symbol number M occupied by each of the first hop and the second hop is the total number of DMRS symbols occupied by the corresponding frequency hopping part in all PUSCH transmission durations.

In a frequency hopping scene in a time slot, the PUSCH transmission repetition number is a scheduled or configured PUSCH transmission repetition number NA or NB, or is an actually transmitted PUSCH transmission repetition number.

In a specific implementation, when frequency hopping in a time slot exists and NA is larger than or equal to M, the DMRS is mapped on each front floor (NA/M) PUSCH hop, and M- (NA% M) groups are shared and correspond to the first part of PUSCHs; and the DMRS is mapped on the last every ceil (NA/M) PUSCHs, and the total number of NA% M groups corresponds to the second part of PUSCHs. The DMRSs are all in one or more hops of the first PUSCH in each group, and the time domain position of the DMRS is the same as that of the DMRS under the same condition (PUSCH configuration and DMRS number) in the existing protocol.

In one implementation, when intra-slot frequency hopping exists and NA < M, min (pos +1, ceil (M/NA)) DMRSs are mapped on the first M% NA PUSCH hops, corresponding to the third partial PUSCH; min (pos +1, floor (M/NA)) DMRSs are mapped on the last NA- (M% NA) PUSCH hops, corresponding to the fourth part PUSCH.

When multiple DMRSs are mapped on the same slot PUSCH hop, the DMRS pattern (pattern) mapped on the PUSCH hop per slot is the same as in the prior art.

For example, in a sixth exemplary application scenario, referring to fig. 9, assuming that PUSCH repeats type a and intra-slot frequency hopping exists, PUSCH maps type a, higher-layer configured DMRS number M' is 4, and PUSCH transmission repetition number NA is 4. Correspondingly, the first intra-hop DMRS number M is ceil (4/2) ═ 2, and the second intra-hop DMRS number M is ceil (4/2) ═ 2.

There is NA > M for both the first and second hops, so, similar to the scenario shown in fig. 3, the first partial PUSCH includes 1 PUSCH and the first density is 2. Thus, the first partial PUSCH comprises 1 PUSCH group and the PUSCH group comprises 2 PUSCHs, corresponding to the PUSCHs on slot 1 and slot 2 in fig. 9. Accordingly, 1 DMRS is mapped to each hop on every 2 PUSCHs in the first portion of PUSCHs.

Similarly, the second partial PUSCH comprises 1 PUSCH group and the second density is 2,. Thus, the second partial PUSCH comprises 1 PUSCH group and the PUSCH group comprises 2 PUSCHs, corresponding to the PUSCHs on slot 3 and slot 4 in fig. 9. Correspondingly, 1 DMRS is mapped to each hop on every 2 PUSCHs in the second partial PUSCH.

In the scenario shown in fig. 9, DMRSs in the first and second partial PUSCHs are both on the first PUSCH of each group. Thus, in fig. 9, the first and second hops of PUSCH on slot 1 are mapped with 1 DMRS, respectively, while PUSCH on slot 2 is not mapped with DMRS, the first and second hops of PUSCH on slot 3 are mapped with 1 DMRS, respectively, and PUSCH on slot 4 is not mapped with DMRS.

Shown in the leftmost column of fig. 9 is the PUSCH length for that row.

For example, in a seventh exemplary application scenario, referring to fig. 10, assuming that PUSCH is repeated for type a and intra-slot hopping is present, PUSCH mapping type a is mapped, the number of DMRSs M' configured for a higher layer is 4, and the number of PUSCH transmission repetition times NA for actual transmission is 3 (since there is a downlink symbol in slot 2, PUSCH in the slot cannot be transmitted). Correspondingly, the first intra-hop DMRS number M is ceil (4/2) ═ 2, and the second intra-hop DMRS number M is ceil (4/2) ═ 2.

There is NA > M for both the first and second hops, so, similar to the scenario shown in fig. 5, the first partial PUSCH comprises 1 PUSCH group and the first density is 1. That is, DMRS is mapped on each hop of each actually transmitted PUSCH in the first partial PUSCH.

Similarly, the second partial PUSCH comprises 1 PUSCH group and the second density is 2. Therefore, DMRSs are mapped on each hop of every 2 actually transmitted PUSCHs in the second partial PUSCH group.

In the scenario shown in fig. 10, DMRSs in the first and second partial PUSCHs are both on the first PUSCH of each group. Thus, in fig. 10, 1 DMRS is mapped to each hop of PUSCH on slot 1, while DMRS is not mapped to PUSCH on slot 2, DMRS is mapped to the first and second hops of PUSCH on slot 3, and DMRS is not mapped to PUSCH on slot 4.

In one implementation, when inter-slot frequency hopping exists, the position and number of DMRSs in each hop can be calculated according to the number of hopping parts, and the number of PUSCH transmission repetitions in each hopping part can be calculated according to the number of hopping parts.

Taking the frequency hopping number as 2 as an example, the total number of DMRS symbols for which the high-level parameters are configured in all PUSCH transmission durations is denoted as M ', then the number of DMRS symbols occupied by the first hop is M ═ ceil (M '/2), and the number of DMRS symbols occupied by the second hop is M ═ floor (M '/2). The DMRS symbol number M occupied by each of the first hop and the second hop is the total number of DMRS symbols occupied by the corresponding frequency hopping part in all PUSCH transmission durations.

And recording the scheduled or configured PUSCH transmission repetition times as NA 'or NB', wherein the PUSCH transmission repetition times in each frequency hopping part are respectively as follows: the first intra-hop NA is ceil (NA '/2) and the second intra-hop NA is floor (NA'/2).

In a specific implementation, when inter-slot frequency hopping exists and NA is larger than or equal to M, the DMRS is mapped on each front floor (NA/M) PUSCH hop, and M- (NA% M) groups are shared and correspond to the first part of PUSCHs; and the DMRS is mapped on the last every ceil (NA/M) PUSCHs, and the total number of NA% M groups corresponds to the second part of PUSCHs. The DMRSs are all in one or more hops of the first PUSCH in each group, and the time domain position of the DMRS is the same as that of the DMRS under the same condition (PUSCH configuration and DMRS number) in the existing protocol.

In one implementation, when there is inter-slot hopping and NA < M, the first M% NA PUSCH hops are catered for min (pos +1, ceil (M/NA)) DMRS, corresponding to the third partial PUSCH; min (pos +1, floor (M/NA)) DMRSs are mapped on the last NA- (M% NA) PUSCH hops, corresponding to the fourth part PUSCH.

When a plurality of DMRSs are mapped on the same slot PUSCH hop, the DMRS pattern mapped on each slot PUSCH hop is the same as the prior art.

For example, in an eighth exemplary application scenario, referring to fig. 11, assuming that PUSCH repeats type a and there is inter-slot hopping, PUSCH maps type a, DMRS number M is 2, and PUSCH transmission repetition number NA is 4. The first hop includes PUSCH on slot 1 and slot 3, the second hop includes PUSCH on slot 2 and slot 4. Note that PUSCH on slot 1 and PUSCH on slot 2 are not actually in the same frequency domain location, and fig. 11 is only exemplarily shown with respect to the time domain locations of the two.

Correspondingly, 1 DMRS is mapped on every 2 PUSCHs included in the first hop, and 1 DMRS is mapped on every 2 PUSCHs included in the second hop. Corresponding to fig. 11, DMRSs are mapped to slot 1 and slot 2, and are not mapped to slot 3 and slot 4, respectively.

For another example, in a ninth exemplary application scenario, referring to fig. 12, assuming that a PUSCH repetition type a and inter-slot hopping are present, a PUSCH mapping type a, a DMRS number M is 2, and a PUSCH transmission repetition number NA of actual transmission is 3 (a PUSCH in a slot 2 cannot be transmitted because of a downlink symbol). The first hop includes PUSCH on slot 1 and slot 3, and the second hop includes PUSCH on slot 4. Note that the PUSCH on slot 3 and the PUSCH on slot 4 are not actually in the same frequency domain location, and fig. 12 is only exemplarily shown with respect to the time domain locations of the two.

Correspondingly, 1 DMRS is mapped on every 2 PUSCHs included in the first hop, and 1 DMRS is mapped on every 2 PUSCHs included in the second hop. Corresponding to fig. 12, slot 1 and slot 4 are mapped with DMRSs, respectively, slot 2 is not mapped with DMRSs since PUSCH is not transmitted, and slot 3 is not mapped with DMRSs.

In one specific implementation, when the DMRS is a dual-symbol DMRS, the mapping positions of the one or more DMRSs on the one or more PUSCHs determined according to at least a size relationship between the number of DMRSs and the number of PUSCH transmission repetitions may refer to starting time-domain symbol positions of the one or more dual-symbol DMRSs on the one or more PUSCHs.

Therefore, by adopting the scheme of the embodiment, the positions of the DMRS in different repeated PUSCHs can be flexibly determined under the scene of repeatedly performing uplink transmission for multiple times. Specifically, the mapping position of the DMRS on the PUSCH is flexibly determined according to the number of the DMRS and the transmission repetition number of the PUSCH, so that the mapping of the DMRS can adapt to various PUSCH repeated configuration scenes, such as different PUSCH duration. Further, while the DMRS can be flexibly mapped to the PUSCH scheduled or configured at this time, it is ensured that the DMRS is distributed on the PUSCH as uniformly as possible, so as to improve the success rate of receiving the DMRS by the UE.

Fig. 13 is a schematic structural diagram of an apparatus for determining a mapping position of a DMRS according to an embodiment of the present invention. Those skilled in the art understand that the device 2 for determining the mapping position of the DMRS described in this embodiment may be used to implement the technical solutions of the methods described in the embodiments of fig. 1 to fig. 12.

Specifically, referring to fig. 13, the apparatus 2 for determining the mapping position of the DMRS according to this embodiment may include: a first determining module 21, configured to determine the number of DMRS and the number of PUSCH transmission repetitions; a second determining module 22, configured to determine mapping positions of one or more DMRSs on one or more PUSCHs according to at least a size relationship between the number of DMRSs and the PUSCH transmission repetition number, so that the one or more DMRSs are substantially uniformly distributed on the one or more PUSCHs.

For more contents of the operation principle and the operation mode of the device for determining mapping position of DMRS 2, reference may be made to the related descriptions in fig. 1 to fig. 12, and details are not repeated here.

Further, the embodiment of the present invention also discloses a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method technical solution described in the embodiments shown in fig. 1 to 12 is 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 storage medium may include ROM, RAM, magnetic or optical disks, etc.

Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the technical solution of the method in the embodiment shown in fig. 1 to 12 when running the computer program. Specifically, the terminal may be a UE, such as a 5G UE.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein 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 determining the mapping position of a DMRS (demodulation reference signal), comprising:

determining the number of DMRS and the number of PUSCH transmission repetition times;

and determining the mapping positions of one or more DMRSs on one or more PUSCHs according to at least the size relation between the DMRS number and the PUSCH transmission repetition number so as to enable the one or more DMRSs to be substantially uniformly distributed on the one or more PUSCHs.

2. The method of claim 1, wherein for PUSCHs of the one or more PUSCHs that are mapped to DMRS, wherein the more advanced PUSCHs are mapped to more DMRS.

3. The method of claim 1 or 2, wherein the determining the mapping position of the one or more DMRSs on the one or more PUSCHs according to at least the size relationship between the DMRS number and the PUSCH transmission repetition number comprises:

when the PUSCH transmission repetition times is more than or equal to the DMRS number, dividing the one or more PUSCHs into a first part PUSCH and a second part PUSCH;

mapping a portion of the one or more DMRSs to the first partial PUSCH at a first density and mapping a remaining portion of the one or more DMRSs to the second partial PUSCH at a second density, wherein the first density is greater than or equal to the second density.

4. The method of claim 3, wherein the first density is rounded down to a ratio of the PUSCH transmission repetition number to the DMRS number, and wherein the second density is rounded up to a ratio of the PUSCH transmission repetition number to the DMRS number.

5. The method of claim 3, wherein the first portion of PUSCH is partitioned into at least one PUSCH group according to the first density, wherein the first portion of PUSCH comprises a number of PUSCH groups that is a difference between the number of DMRSs and a number of PUSCHs that are not mapped to the DMRS when the one or more DMRSs are equally allocated; and dividing the second part of PUSCH into at least one PUSCH group according to the second density, wherein the number of PUSCH groups included in the second part of PUSCH is the number of PUSCHs which are not mapped to the DMRS when the one or more DMRSs are averagely allocated.

6. The method of claim 3, wherein the mapping a portion of the one or more DMRSs to the first portion of the PUSCH at the first density comprises:

dividing the first portion of PUSCH into at least one PUSCH group according to the first density and mapping a portion of the one or more DMRSs to a first PUSCH in each PUSCH group;

the mapping remaining portions of the one or more DMRSs to the second partial PUSCHs at the second density comprises:

dividing the second partial PUSCH into at least one PUSCH group according to the second density, and mapping a remaining portion of the one or more DMRSs to a first PUSCH in each PUSCH group.

7. The method of claim 6, wherein the mapping the portion of the one or more DMRSs to a first PUSCH in each PUSCH group comprises:

when intra-slot frequency hopping exists, mapping a part of the one or more DMRSs to each frequency hopping part of a first PUSCH in each PUSCH group;

the mapping the remaining portion of the one or more DMRSs to a first PUSCH in each PUSCH group comprises:

when there is intra-slot frequency hopping, mapping the remaining portion of the one or more DMRSs to each frequency-hopped portion of a first PUSCH in each PUSCH group.

8. The method of claim 1 or 2, wherein the determining the mapping position of the one or more DMRSs on the one or more PUSCHs according to at least the size relationship between the DMRS number and the PUSCH transmission repetition number comprises:

when the PUSCH transmission repetition times is less than the DMRS number, dividing the one or more PUSCHs into a third portion PUSCH and a fourth portion PUSCH;

mapping a first number of DMRS to each PUSCH in the third portion of PUSCHs, and mapping a second number of DMRS to each PUSCH in the fourth portion of PUSCHs, wherein the first number is greater than or equal to the second number.

9. The method of claim 8, wherein the first amount is calculated based on the following equation:

number1＝min(pos+1,ceil(M/NX))；

wherein number1 is the first number; the min () function is a minimum function; pos is the number of additional DMRS; ceil () function is rounded up to the nearest integer; m is the DMRS number; NX is the PUSCH transmission repetition number;

the second quantity is calculated based on the following formula:

number2＝min(pos+1,floor(M/NX))；

10. The method of claim 1, wherein the PUSCH transmission repetition number is selected from: the number of PUSCH transmission repetitions for dynamic scheduling, the number of PUSCH transmission repetitions for configuration grant, the number of PUSCH transmission repetitions for actual transmission, and the number of PUSCH transmission repetitions within a single hopping part.

11. The method of claim 1, wherein the number of DMRSs is a total number of DMRSs within a total transmission duration of a PUSCH or a number of DMRSs occupied by a single frequency hopping part.

12. The method of claim 1, wherein when the DMRS is a dual-symbol DMRS, the mapped locations of the one or more DMRSs on the one or more PUSCHs determined based at least on the magnitude of the number of DMRSs relative to the number of PUSCH transmission repetitions is a starting time-domain symbol location of the one or more DMRSs on the one or more PUSCHs.

13. The method of claim 1, wherein the determining the DMRS number comprises:

and searching a preset configuration table according to part or all of parameters in the PUSCH duration, the PUSCH mapping type, the PUSCH repetition times, the DMRS type and the frequency hopping type to determine the DMRS number, wherein the preset configuration table records different PUSCH durations, PUSCH mapping types, PUSCH repetition times, DMRS types and DMRS numbers associated with the frequency hopping types.

14. An apparatus for determining a mapping position of a DMRS, comprising:

the first determining module is used for determining the DMRS number and the PUSCH transmission repetition number;

a second determining module, configured to determine mapping positions of one or more DMRSs on one or more PUSCHs according to at least a size relationship between the number of DMRSs and the PUSCH transmission repetition number, so that the one or more DMRSs are substantially uniformly distributed on the one or more PUSCHs.

15. A storage medium having a computer program stored thereon, the computer program, when being executed by a processor, performing the steps of the method according to any one of claims 1 to 13.

16. A terminal comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the computer program, performs the steps of the method of any of claims 1 to 13.