CN114009135A

CN114009135A - Method, apparatus, and computer storage medium for communication

Info

Publication number: CN114009135A
Application number: CN201980097787.9A
Authority: CN
Inventors: 高毓恺; 王刚
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2022-02-01
Also published as: JP7380719B2; JP2022545602A; JP2024001327A; WO2020258046A1

Abstract

Embodiments of the present disclosure relate to methods, devices, and computer-readable media for DMRS transmission and reception. A method, comprising: determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of TCI states to be used for communicating with another device; determining a set of transmission opportunities associated with one of the plurality of TCI states from the plurality of transmission opportunities in response to a plurality of transmission opportunities of the physical shared channel being configured by the control information to be scheduled; determining, for the set of transmission occasions, a respective resource allocation for transmission of the at least one DMRS of the physical shared channel to the other device; and transmitting the at least one DMRS to the other device during the set of transmission occasions based on the resource allocation and the TCI status.

Description

Method, apparatus, and computer storage medium for communication

Technical Field

Embodiments of the present disclosure relate generally to the field of telecommunications, and more particularly, to methods, apparatuses, and computer storage media for communication.

Background

In a new radio access (NR), a network device (e.g., a next generation nodeb (gnb)) may be equipped with multiple Transmission and Reception Points (TRPs) or multiple antenna panels. That is, the network device may communicate with a terminal device (e.g., User Equipment (UE)) via one or more of multiple TRPs or multiple antenna panels, which is also referred to as "multi-TRP communication.

In some multi-TRP communication schemes, multiple Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH) repetitions may be scheduled using a single Downlink Control Information (DCI) to achieve better performance. The number of PDSCH or PUSCH repetitions scheduled by a single DCI may be 1, 2, 4, or 8. Each repetition may occupy at least two symbols, one DMRS for a physical shared channel (i.e., PDSCH or PUSCH) and another DMRS for data. Thus, if the number of repetitions of a single DCI schedule is 4, at least 8 symbols are required. If the number of repetitions of a single DCI schedule is 8, at least 16 symbols are needed, which may exceed the length of the slot. That is, if each repetition includes at least one symbol for transmitting/receiving a DMRS, many resources may be wasted and 8 PDSCH or PUSCH repetitions cannot be achieved within one slot.

Disclosure of Invention

In general, example embodiments of the present disclosure provide methods, apparatuses, and computer storage media for communication.

In a first aspect, a method of communication is provided. The method comprises the following steps: determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of Transmission Control Indication (TCI) states to be used for communicating with another device on the physical shared channel; determining a set of transmission occasions associated with one of the plurality of TCI states from the plurality of transmission occasions in response to a plurality of transmission occasions of the physical shared channel being configured to be scheduled by the control information; determining, for the set of transmission occasions, a respective resource allocation for transmission of at least one demodulation reference signal (DMRS) of the physical shared channel to the other device; and transmitting the at least one DMRS to the other device during the set of transmission occasions based on the resource allocation and the TCI status.

In a second aspect, a method of communication is provided. The method comprises the following steps: determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of Transmission Control Indication (TCI) states to be used for communicating with another device on the physical shared channel; determining a set of receive opportunities associated with one of the plurality of TCI states from the plurality of receive opportunities in response to a plurality of receive opportunities of the physical shared channel being configured to be scheduled by the control information; determining, for the set of receivers, respective resource allocations for receiving at least one demodulation reference signal (DMRS) of the physical shared channel from the other device; and receiving the at least one DMRS from the other device during the set of receivers based on the resource allocation and the TCI status.

In a third aspect, a communication device is provided. The communication device includes a processor and a memory. The memory is coupled to the processor and stores instructions thereon. The instructions, when executed by the processor, cause the apparatus to perform acts comprising: determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of Transmission Control Indication (TCI) states to be used for communicating with another device on the physical shared channel; determining a set of transmission occasions associated with one of the plurality of TCI states from the plurality of transmission occasions in response to a plurality of transmission occasions of the physical shared channel being configured to be scheduled by the control information; determining, for the set of transmission occasions, a respective resource allocation for transmission of at least one demodulation reference signal (DMRS) of the physical shared channel to the other device; and transmitting the at least one DMRS to the other device during the set of transmission occasions based on the resource allocation and the TCI status.

In a fourth aspect, a communication device is provided. The communication device includes a processor and a memory. The memory is coupled to the processor and stores instructions thereon. The instructions, when executed by the processor, cause the apparatus to perform acts comprising: determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of Transmission Control Indication (TCI) states to be used for communicating with another device on the physical shared channel; determining a set of receive opportunities associated with one of the plurality of TCI states from the plurality of receive opportunities in response to a plurality of receive opportunities of the physical shared channel being configured to be scheduled by the control information; determining, for the set of receivers, respective resource allocations for receiving at least one demodulation reference signal (DMRS) of the physical shared channel from the other device; and receiving the at least one DMRS from the other device during the set of receivers based on the resource allocation and the TCI status.

In a fifth aspect, there is provided a computer-readable medium having instructions stored thereon, which when executed on at least one processor causes the at least one processor to perform a method according to the first aspect.

In a sixth aspect, there is provided a computer-readable medium having instructions stored thereon, which when executed on at least one processor causes the at least one processor to perform a method according to the second aspect.

Other features of the present disclosure will become apparent from the following description.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent from the following more detailed description of some embodiments of the present disclosure, as illustrated in the accompanying drawings, in which:

fig. 1 illustrates an example communication network in which some embodiments of the present disclosure may be implemented;

fig. 2 illustrates an example signaling diagram demonstrating an example process in accordance with some embodiments of the present disclosure;

3A-3B illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure;

4A-4B illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure;

5A-5B illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure;

FIG. 6 illustrates an example diagram of resource allocation in accordance with some embodiments of the present disclosure;

7A-7E illustrate exemplary diagrams of resource allocations according to some embodiments of the present disclosure;

8A-8D illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure;

9A-9C illustrate exemplary diagrams of resource allocations according to some embodiments of the present disclosure;

FIG. 10 illustrates an example method according to some embodiments of the present disclosure;

FIG. 11 illustrates an example method according to some embodiments of the present disclosure; and

FIG. 12 is a simplified block diagram of an apparatus suitable for practicing embodiments of the present disclosure.

Throughout the drawings, the same or similar reference numerals denote the same or similar elements.

Detailed Description

The principles of the present disclosure will now be described with reference to a few exemplary embodiments. It is understood that these examples are described merely to illustrate and assist those of ordinary skill in the art in understanding and practicing the present disclosure, and do not imply any limitation on the scope of the present disclosure. The disclosure described herein may be implemented in various ways other than those described below.

In the following description and in the claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "including" and its variants are to be understood as open-ended terms, meaning "including, but not limited to". The term "based on" is to be understood as "based at least in part on". The terms "an embodiment" and "one embodiment" should be understood as "at least one embodiment". The term "another embodiment" should be understood as "at least one other embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions may be included below.

In some examples, a value, process, or device is referred to as "best," "lowest," "highest," "minimum," "maximum," or the like. It should be understood that such description is intended to indicate that a selection may be made among the many functional alternatives used, and that such selection need not be better, smaller, higher, or more preferred than others.

Fig. 1 illustrates an example communication network 100 in which embodiments of the present disclosure may be implemented. As shown in fig. 1, network 100 includes a network device 110, network device 110 coupled with two TRP/panels 120-1 and 120-2 (collectively TRPs 120 or TRPs 120 alone). Network 100 also includes terminal device 130 served by network device 110. It should be understood that the number of network devices, terminal devices and TRPs shown in fig. 1 is for illustrative purposes only and does not present any limitation. Network 200 may include any suitable number of devices suitable for implementing embodiments of the present disclosure.

As used herein, the term "terminal device" refers to any device having wireless or wired communication capabilities. Examples of terminal devices include, but are not limited to, User Equipment (UE), personal computers, desktop computers, mobile phones, cellular phones, smart phones, Personal Digital Assistants (PDAs), portable computers, image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or internet appliances capable of wireless or wired internet access and browsing, among others. For discussion purposes, some embodiments will be described below with reference to a user equipment as an example of the terminal device 130.

As used herein, the term "network device" or "base station" (BS) refers to a device that is capable of providing or housing a cell or coverage area in which a terminal device may communicate. Examples of network devices include, but are not limited to, a Node B (Node B or NB), an evolved Node B (eNodeB or eNB), a next generation Node B (gnb), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a low power Node such as a femto Node, pico Node, and the like.

As used herein, the term "TRP" refers to an antenna array (having one or more antenna elements) available to a network device located at a particular geographic location. For example, a network device may be coupled with multiple TRPs in different geographic locations to achieve better coverage. It should be understood that a TRP may also be referred to as a "panel," which also refers to an antenna array (having one or more antenna elements) or a set of antennas.

As shown in fig. 1, network device 110 may communicate with terminal device 130 via TRP 120-1 and TRP 120-2. Hereinafter, TRP 120-1 may also be referred to as a first TRP, and TRP 120-2 may also be referred to as a second TRP. Each TRP 120 may provide multiple beams for communication with terminal device 130.

Communications in network 100 may conform to any suitable standard including, but not limited to, Long Term Evolution (LTE), LTE-Evolution (LTE-Evolution), LTE-advanced (LTE-a), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), global system for mobile communications (GSM), and the like. Further, the communication may be performed in accordance with any generation communication protocol currently known or developed in the future. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, and fifth generation (5G) communication protocols.

As described above, in some multi-TRP communication schemes, multiple Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH) repetitions may be scheduled using a single Downlink Control Information (DCI) to achieve better performance. The number of PDSCH or PUSCH repetitions scheduled by a single DCI may be 1, 2, 4, or 8. Each repetition may occupy at least two symbols, one symbol for DMRS of a physical shared channel (i.e., PDSCH or PUSCH) and another symbol for data. Thus, if the number of repetitions of a single DCI schedule is 4, at least 8 symbols are required. If the number of repetitions of a single DCI schedule is 8, at least 16 symbols are needed, which may exceed the length of the slot. That is, if each repetition includes at least one symbol for transmitting/receiving a DMRS, many resources may be wasted and 8 PDSCH or PUSCH repetitions cannot be achieved within one slot.

Example embodiments of the present disclosure provide solutions for multiple TRP communications. The solution disables DMRS transmission and reception in at least one of PDSCH or PUSCH repetitions. Furthermore, the solution allows different resource patterns to be used in different repetitions. Thus, this solution may enable better resource utilization. In addition, the solution can also achieve backward compatibility of scheduling of PDSCH or PUSCH repetition in multi-TRP communication, thereby achieving high performance.

Fig. 2 shows an example signaling diagram illustrating an example process 200 according to some embodiments of the present disclosure. As shown in fig. 2, process 200 may involve two

devices

201 and 202. It should be understood that process 200 may include additional acts not shown and/or may omit some acts shown, and the scope of the present disclosure is not limited in this respect.

In some embodiments, in PUSCH communication, device 201 may be terminal device 130 as shown in fig. 1, and device 202 may be network device 110 or TRP 120 as shown in fig. 1.

In this case, as shown in fig. 2, device 202 may determine 240 Downlink Control Information (DCI) for scheduling PUSCH transmission and transmit (not shown in fig. 2) the DCI to device 201. The device 201 may determine 210 control information for scheduling PUSCH from the received DCI. In some embodiments, the control information may indicate a plurality of Transmission Control Indication (TCI) states to be used for data communication on the PUSCH between the device 201 and the device 202. The TCI status may indicate one reference signal set and parameters configuring a quasi-co-location (QCL) relationship between reference signals in the reference signal set and DMRS ports for PUSCH. For example, different TCI states may be used for different TRPs. In some embodiments, the device 201 may be configured with multiple PUSCH repetitions scheduled by the control information (also referred to as "transmission occasions for PUSCH"). As shown in fig. 2, the device 201 may determine 220 a set of PUSCH repetitions associated with one of the plurality of TCI states from the plurality of PUSCH repetitions. The device 201 may further determine 230 a respective resource allocation for transmitting the set of PUSCH repetitions to the device 202. For example, a resource allocation repeated for one PUSCH may indicate resources (e.g., time resources and/or frequency resources) for transmitting one or more DMRSs and/or data of a PUSCH.

In some embodiments, the device 202 may also be configured with multiple PUSCH repetitions (also referred to as "reception occasions for PUSCH"). As shown in fig. 2, device 202 may determine 250 a set of PUSCH repetitions associated with one of a plurality of TCI states from a plurality of PUSCH repetitions (e.g., in the same manner as device 201). Device 202 can also determine 260, for the set of PUSCH repetitions, a respective resource allocation for receiving the set of PUSCH repetitions from device 201 (e.g., in the same manner as device 201). Then, as shown in fig. 2, the device 201 may transmit 270 the set of PUSCH repetitions to the device 202 based on the determined resource allocation and the TCI status associated with the set of PUSCH repetitions. Likewise, the device 202 can receive 270 the set of PUSCH repetitions from the device 201 based on the determined resource allocation and TCI status.

Optionally, in some embodiments, in PDSCH communication, device 201 may be network device 110 or TRP 120 as shown in fig. 1, and device 202 may be terminal device 130 as shown in fig. 1.

In this case, as shown in fig. 2, device 201 may determine 210 DCI for scheduling PDSCH transmissions and transmit the DCI to device 202. The device 202 may determine 240 control information for scheduling the PDSCH from the received DCI. In some embodiments, the control information may indicate a plurality of TCI states to be used for data communication between device 201 and device 202 on the PDSCH. The TCI status may indicate one reference signal set and parameters configuring a quasi-co-location relationship between reference signals within the reference signal set and DMRS ports of the PDSCH. For example, different TCI states may be used for different TRPs. In some embodiments, the device 201 may be configured with multiple PDSCH repetitions scheduled by the control information (also referred to as "transmission occasions of PDSCH"). As shown in fig. 2, the device 201 may determine 220 a set of PDSCH repetitions associated with one of a plurality of TCI states from the plurality of PDSCH repetitions. The device 201 may further determine 230 a respective resource allocation for transmitting the set of PDSCH repetitions to the device 202. For example, a resource allocation for one PDSCH repetition may indicate respective resources (e.g., time resources and/or frequency resources) for transmitting one or more DMRSs and/or data of the PDSCH.

In some embodiments, the device 202 may also be configured with multiple PDSCH repetitions (also referred to as "reception occasions of PDSCH"). As shown in fig. 2, device 202 may determine 250 a set of PDSCH repetitions associated with one of a plurality of TCI states from the plurality of PDSCH repetitions (e.g., in the same manner as device 201). Device 202 can also determine 260, for the set of PDSCH repetitions, a respective resource allocation for receiving the set of PDSCH repetitions from device 201 (e.g., in the same manner as device 201). Then, as shown in fig. 2, the device 201 may transmit 270 the set of PDSCH repetitions to the device 202 based on the determined resource allocation and the TCI status associated with the set of PDSCH repetitions. Likewise, the device 202 may receive 270 the set of PDSCH repetitions from the device 201 based on the determined resource allocation and TCI status.

More details regarding resource allocation for PDSCH or PUSCH repetition will be described below with reference to fig. 3 through 9C. Hereinafter, some embodiments of the present disclosure will be described with reference to the PDSCH. It should be understood that this is done for illustrative purposes only and is not intended to suggest any limitation as to the scope of the disclosure. Embodiments of the present disclosure may also be applicable to PUSCH.

In some embodiments, for each repetition of a physical shared channel (e.g., PUSCH or PDSCH), the resource allocation may be determined based on at least one of: a number of additional DMRSs configured for a physical shared channel; a time slot format; the number of repetitions; respective lengths of repetitions (e.g., the number of symbols occupied by each repetition); maximum length in a repetition (e.g., maximum number of symbols occupied by one repetition in a repetition); a resource mapping type of the physical shared channel (e.g., PDSCH mapping type a or PDSCH mapping type B as specified in 3GPP specification release 15); DMRS configuration type (DMRS type 1 or DMRS type 2 as specified in 3GPP specification release 15); a plurality of DMRS CDM (code domain multiplexing) groups without data (as specified in release 15 of the 3GPP specification), a starting Position or symbol index of the DMRS (higher layer parameter DMRS-type a-Position as specified in release 15 of the 3GPP specification) and one or more DMRS Position parameters associated with a resource mapping type (DMRS-additional Position for PDSCH mapping type a or PDSCH mapping type B as specified in release 15 of the 3GPP specification).

In some embodiments, N TCI states (where N is an integer and 1 ≦ N ≦ 4), a total of R repetitions of a physical shared channel (e.g., PUSCH or PDSCH) (where R is an integer and 2 ≦ R ≦ 32), and a total of L for one repetition may be configured at a device (e.g., device 201 or 202)_jA symbol (wherein L_jIs an integer and 1. ltoreq.L_j14, and j is an integer and 1. ltoreq. j. ltoreq.R). For example, one of the N TCI states may be associated with k repetitions selected from a total of R repetitions (where k ≧ 1). In some embodiments, a total of L for one repeat_jThe individual symbols may include data symbols and/or DMRS symbols. In some embodiments, for k repetitions associated with the same TCI state, there may be no transmit/receive opportunity associated with another TCI state between two adjacent repetitions of the k repetitions. In some embodiments, the k repetitions associated with the same TCI state may be consecutive in a sub-slot or symbol. Optionally, in some embodiments, the k repetitions associated with the same TCI state may not be contiguous in symbol. In some embodiments, N may be one of {1, 2, 4 }.

In some embodiments, R may be equal to 2. In this case, the number N of TCI states may be 2. There may be only one repetition for each TCI state. For example, the total number of symbols of the first repetition (also referred to as the "symbol length" or "length of first repetition") may be L₁(wherein L₁Is an integer and 1. ltoreq. L₁14 ≦) the first repeated DMRS symbol number may be M₁(wherein M is₁Is an integer and 1. ltoreq. M₁4) and the total number of symbols for the second repetition may be L₂(wherein L₂Is an integer and 1. ltoreq.L₂14 ≦ 14) and the number of DMRS symbols for the second repetition may be M₂(whereinM₂Is an integer and 1. ltoreq. M₂Less than or equal to 4). In some embodiments, L₁May be different from L₂The value of (c). In some embodiments, M₁May be different from M₂The value of (c). In some embodiments, a position of the first DMRS in the first repetition and a position of the first DMRS in the second repetition may be different. In some embodiments, the location of the first DMRS in the first repetition may be all L₁The first symbol of the plurality of symbols. In some embodiments, the location of the second DMRS in the second repetition may not be all L₂The first symbol of the plurality of symbols. For example, the location of the second DMRS in the second repetition may be all L₂The second of the symbols.

In some embodiments, R may be an integer and 2<R is less than or equal to 32. For example, R may be one of {3, 4, 5, 6, 7, 8, 10, 12, 14, 16 }. In some embodiments, the length of each repeated symbol, L_jMay be the same. In some embodiments, the respective symbol lengths L of the at least two different repetitions_jAnd L_g(where j is an integer and 1. ltoreq. j.ltoreq.R, g is an integer and 1. ltoreq. g.ltoreq.R, and g.noteq.j) may be different. In some embodiments, the maximum symbol length in the R repetitions can be L (where L is an integer and 1 ≦ L ≦ 14). In some embodiments, L may be one of {1, 2, 3, 4, 5, 6, 7 }. In some embodiments, the number of DMRS symbols per repetition is M_jMay be the same. In some embodiments, the number of DMRS symbols for at least two different repetitions, M_jAnd M_g(where j is an integer and 1. ltoreq. j.ltoreq.R, g is an integer and 1. ltoreq. g.ltoreq.R, and g.noteq.j) may be different. In some embodiments, the maximum number of DMRS symbols in R repetitions may be M (where M is an integer and 1 ≦ M ≦ 4). In some embodiments, M may be 1 or 2.

In some embodiments, the total number of symbols, the number of DMRS symbols, and/or the location of DMRS symbols for different repetitions may be different for different values of R and/or N. In some embodiments, if R-2 and/or N-2, the total number of symbols for different repetitions, the number of DMRS symbols, and/or the positions of DMRS symbols may be the same; and if R is an integer and 2< R ≦ 32, the total number of symbols for the at least two different repetitions, the number of DMRS symbols, and/or the location of the DMRS symbols may be different.

In some cases, the number of configured TCI states N ≧ 2, the total number of configured repetitions R >2, at least one DMRS symbol in a repetition. In this case, in some embodiments, there may be no data frequency-division multiplexed with the DMRS in the symbol for DMRS mapping. In some embodiments, if the DMRS type is configured as DMRS type 1, the number of DMRS CDM groups without data may be fixed to 2. In some embodiments, if the DMRS type is configured as DMRS type 2, the number of DMRS CDM groups without data is fixed to 3. In some embodiments, the number of symbols for the preamble DMRS may be limited to 1. In some embodiments, the total maximum number of symbols occupied by one repetition may be at least 2.

In some embodiments, R may be equal to 2. In this case, the number N of TCI states may be 2. There may be only one repetition for each TCI state. For example, the total number of symbols of the first repetition (also referred to as the "symbol length" or "length of first repetition") may be L₁(wherein L₁Is an integer and 1. ltoreq. L₁14 ≦) the first repeated DMRS symbol number may be M₁(wherein M is₁Is an integer and 1. ltoreq. M₁4) and the total number of symbols of the second repetition may be L₂(wherein L₂Is an integer and 1. ltoreq.L₂14 ≦) and the second repeated DMRS symbol number may be M₂(wherein M is₂Is an integer and 1. ltoreq. M₂Less than or equal to 4). In some embodiments, L₁May be different from L₂The value of (c). In some embodiments, M₁May be different from M₂The value of (c). In some embodiments, a position of the first DMRS in the first repetition and a position of the first DMRS in the second repetition may be different. In some embodiments, the location of the first DMRS in the first repetition may be all L₁The first symbol of the plurality of symbols. In some embodiments, the second of the second repetitionsThe positions of the two DMRSs may not be all L₂The first symbol of the plurality of symbols. For example, the location of the second DMRS in the second repetition may be all L₂The second of the symbols.

Fig. 3A and 3B illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure. Fig. 3A and 3B each show k repetitions 310 associated with the same TCI state_i、310_i+1...310_i+k-1Wherein k is more than or equal to 1. In fig. 3A and 3B, the total number of symbols occupied by k repetitions is L, respectively_i，L_i+1...L_i+k-1。L_i，L_i+1...L_i+k-1Each of which may be an integer, and is in [1, L ]]Within the range of (1). In some embodiments, symbols occupied by one repetition may be indexed by relative values within the repetition. For example, by repeating 310_iThe occupied symbol can be (1, 2, … L)_i) To index; by repeating 310_i+1The occupied symbol can be (1, 2, … L)_i+1) To index; … … and is formed by repetition of 310_i+k-1The occupied symbol can be (1, 2, … L)_i+k-1) To index. The number of k repeated DMRS symbols may be M_i，M_i+1...M_i+k-1. In each of the k repetitions, the number of DMRSs may be 0, 1, or 2. That is, in each of the k repetitions, the maximum number of DMRS symbols may be M, where M may be 1 or 2. In some embodiments, for one of the k repetitions, such as repetition 310 shown in FIG. 3A_iThe location of the first DMRS in the repetition may not be the first symbol in the repetition. Optionally, in some embodiments, for one of the k repetitions, such as repetition 310 shown in FIG. 3B_iThe location of the first DMRS in the repetition may be the first symbol in the repetition.

In some embodiments, there may be k repetitions associated with the same TCI state. In some embodiments, the respective symbol lengths L of the at least two different repetitions_jAnd L_g(where j is an integer and 1 ≦ j ≦ k, g is an integer and 1 ≦ g ≦ k, and g ≠ j) may be different. In some implementationsIn an example, the number M of DMRS symbols of at least two different repetitions_jAnd M_g(where j is an integer and 1 ≦ j ≦ k, g is an integer and 1 ≦ g ≦ k, and g ≠ j) may be different. In some embodiments, the position of the DMRS symbol within one repetition may be at least partially different from the position of the DMRS symbol within another repetition, at least for two different repetitions of the k repetitions.

In some embodiments, if the number of TCI states configured, N ≧ 2 and/or the total number of repetitions configured, R >2, there may be k repetitions associated with the same TCI state. In some embodiments, if the length of each repeated symbol is W, then W may be 1 or 2. In some embodiments, if there is a DMRS mapped for one repetition, the DMRS may be frequency division multiplexed with data within W symbols. In some embodiments, for at least one of the k repetitions, no DMRS may be mapped into the W symbols of the repetition. Alternatively, no DMRS may be frequency division multiplexed with data within the repeated W symbols. In some embodiments, the transmit power of the data in the W symbols without frequency division multiplexing of the DMRS with the data may exceed the transmit power of the data in the W symbols with frequency division multiplexing of the DMRS with the data. In some embodiments, for a first repetition of the k repetitions, there may be a DMRS mapped within W symbols. Optionally, there may be a DMRS frequency division multiplexed with data. For at least one of the remaining k-1 repetitions, there may be no DMRS mapped within the W symbols. Alternatively, there may be no DMRS frequency division multiplexed with data.

In some embodiments, the indicated number of DMRS ports for PDSCH/PUSCH transmission may be less than 4 if the DMRS type is configured as DMRS type 1. For example, the indicated number of DMRS ports for PDSCH/PUSCH transmissions may be limited to 1. In some embodiments, if the DMRS type is configured as DMRS type 1, the indicated DMRS port for PDSCH/PUSCH transmission may be one of the following: { port 0}, { port 1}, { port 0 and port 1}, { port 4}, { port 5}, { port 4 and port 5}, { port 0, port 1 and port 4} or { port 0, port 1, port 4 and port 5 }. In some embodiments, if the DMRS type is configured as DMRS type 1, the indicated DMRS ports for PDSCH/PUSCH transmission may be mapped to resource elements (hereinafter denoted as "REs") having even indices. For example, the RE index used for DMRS mapping may include {0, 2, 4, 6, 8, 10} within one physical resource block (hereinafter denoted "PRB") scheduled for PDSCH/PUSCH. In some embodiments, if the DMRS type is configured as DMRS type 1, the indicated DMRS ports for PDSCH/PUSCH transmission may be mapped to REs with even indices (also referred to as "even REs") in the frequency domain. In some embodiments, if there is a DMRS mapped for one repetition, the DMRS may be frequency division multiplexed with data within W symbols. For example, DMRS may be mapped to even REs, and data may be mapped to odd REs (i.e., REs with odd indices). In some embodiments, for at least one of the k repetitions, no DMRS may be mapped within the W symbols of the repetition. Alternatively, no DMRS may be frequency division multiplexed with data within the repeated W symbols. For example, in such a repetition, data may be mapped to odd REs, and even REs are reserved as blanks for the terminal device. For another example, in this repetition, data may be mapped to even REs and odd REs reserved as blanks for the terminal device. In some embodiments, for at least one of the k repetitions, no DMRS may be mapped within W symbols, and there are two repetitions within the W symbols. For example, one repeated data may be mapped to odd REs among W symbols, and another repeated data may be mapped to even REs among W symbols. In some embodiments, there may be DMRSs mapped within W symbols for a first repetition, a fourth repetition, a sixth repetition, a seventh repetition, and/or an eighth repetition of k repetitions. Optionally, there may be a DMRS frequency division multiplexed with data. For example, DMRS may be mapped to even REs and data may be mapped to odd REs. In some embodiments, for the nth and (n +1) th repetitions of the k repetitions, no DMRS may be mapped within the W symbols. In some embodiments, the nth repetition and the (n +1) th repetition may be mapped to the same W symbols. For example, the nth repeated data may be mapped to even REs, and the (n +1) th repeated data may be mapped to odd REs. For another example, the nth repeated data may be mapped to odd REs, and the (n +1) th repeated data may be mapped to even REs. In some embodiments, n is an integer, and n may be one of {2, 4, 5, 6, 7 }.

In some embodiments, the indicated number of DMRS ports for PDSCH/PUSCH transmission may be less than 2 or less than 4 if the DMRS type is configured as DMRS type 2. For example, the indicated number of DMRS ports for PDSCH/PUSCH transmissions may be limited to 1. In some embodiments, if the DMRS type is configured as DMRS type 2, the indicated DMRS port for PDSCH/PUSCH transmission may be one of the following: { port 0}, { port 1}, { port 0 and port 1}, { port 6}, { port 7}, { port 0 and port 6}, { port 1 and port 7}, { port 6 and port 7}, { port 0, port 1 and port 6} or { port 0, port 1, port 6 and port 7 }. In some embodiments, if the DMRS type is configured as DMRS type 2, the indicated DMRS ports for PDSCH/PUSCH transmission may be mapped to REs indexed by {0, 1, 6, 7} in the frequency domain within one of the PRBs scheduled for PDSCH/PUSCH. In some embodiments, if there is a DMRS mapping for one repetition, the DMRS may be frequency division multiplexed with data within W symbols. For example, within one PRB among PRBs scheduled for PDSCH/PUSCH, DMRS may be mapped to REs indexed by {0, 1, 6, 7} in the frequency domain, and data may be mapped to REs indexed by {2, 3, 4, 5, 8, 9, 10, 11} in the frequency domain. In some embodiments, for at least one of the k repetitions, no DMRS may be mapped within the W symbols of the repetition. Alternatively, no DMRS may be frequency division multiplexed with data within the repeated W symbols. For example, within one PRB among PRBs scheduled for PDSCH/PUSCH, data may be mapped to REs indexed by {2, 3, 4, 5, 8, 9, 10, 11} in the frequency domain, and REs indexed by {0, 1, 6, 7} in the frequency domain may be left blank for the terminal device. For another example, within one PRB among PRBs scheduled for PDSCH/PUSCH, data may be mapped to REs indexed by {0, 1, 2, 3, 6, 7, 8, 9} in the frequency domain, and REs indexed by {4, 5, 10, 11} in the frequency domain may be left blank for the terminal device. In some embodiments, for the mth repetition of the k repetitions, there may be DMRSs mapped within W symbols. Optionally, there may be DMRS frequency division multiplexing with data. For example, within one PRB among PRBs scheduled for PDSCH/PUSCH, DMRS may be mapped to REs indexed by {0, 1, 6, 7} in the frequency domain, and data may be mapped to REs indexed by {2, 3, 4, 5, 8, 9, 10, 11} in the frequency domain. In some embodiments, m is an integer, and m can be one of {1, 2, 3, 4, 5, 6, 7, 8 }. In some embodiments, for the nth and (n +1) th repetitions of the k repetitions, no DMRS may be mapped within the W symbols. In some embodiments, the nth repetition and the (n +1) th repetition may be mapped to the same W symbols. For example, within one PRB among PRBs scheduled for PDSCH/PUSCH, the nth repeated data may be mapped to REs indexed by {2, 3, 4, 5, 8, 9, 10, 11} in the frequency domain, and the (n +1) th repeated data may be mapped to REs indexed by {0, 1, 6, 7} in the frequency domain. For example, within one PRB among PRBs scheduled for PDSCH/PUSCH, the nth repeated data may be mapped to REs indexed by {0, 1, 2, 3, 6, 7, 8, 9} in the frequency domain, and the (n +1) th repeated data may be mapped to REs indexed by {4, 5, 10, 11} in the frequency domain. In some embodiments, n is an integer, and n may be one of {2, 3, 4, 5, 6, 7, 8 }. In some embodiments, the f-th repetition of the k repetitions may be mapped to a different W symbol pair. For example, if W ═ 1, within one PRB among PRBs scheduled for PDSCH/PUSCH, a part of the f-th repeated data may be mapped to REs indexed with {0, 1, 6, 7} in the frequency domain of symbol a, and the remaining part of the f-th repeated data may be mapped to REs indexed with {4, 5, 10, 11} in the frequency domain of symbol B. In some embodiments, A and B are both integers, where 2 ≦ A ≦ 14 and 2 ≦ B ≦ 14, and where A ≠ B. For another example, if W ═ 2, within one PRB among PRBs scheduled for PDSCH/PUSCH, a part of data of the f-th repetition may be mapped to REs indexed with {0, 1, 6, 7} in the frequency domain of symbol a and symbol a +1, and the remaining part of data of the f-th repetition may be mapped to REs indexed with {4, 5, 10, 11} in the frequency domain of symbol B and symbol B + 1. In some embodiments, f is an integer and f may be one of {2, 3, 4, 5, 6, 7, 8 }. In some embodiments, A and B are both integers, where 2 ≦ A ≦ 13 and 2 ≦ B ≦ 13, and where A ≠ B.

In some embodiments, the indicated number of DMRS ports for PDSCH/PUSCH transmission may be less than 4 or less than 8 if the DMRS type is configured as DMRS type 2. In some embodiments, if the DMRS type is configured as DMRS type 2, the indicated DMRS port for PDSCH/PUSCH transmission may be one of the following: { port 0}, { port 1}, { port 2}, { port 3}, { port 0 and port 1}, { port 2 and port 3}, { port 0 and port 2}, { port 0, port 1, port 2 and port 3}, { port 6}, { port 7}, { port 6 and port 7}, { port 8}, { port 9}, { port 8 and port 9}, { port 0, port 1 and port 6}, { port 0, port 1, port 6 and port 7}, { port 2, port 3 and port 8}, { port 2, port 3, port 8 and port 9}, { port 0, port 1, port 2, port 3, port 6 and port 7}, or {0, port 3, port 6, port 7} or { port 8}, respectively, Port 1, port 2, port 3, port 6, port 7, port 8 and port 9 }. In some embodiments, if the DMRS type is configured as DMRS type 2, the indicated DMRS ports for PDSCH/PUSCH transmission may be mapped to REs indexed with {0, 1, 4, 5, 6, 7, 8, 9} in the frequency domain within one of the PRBs scheduled for PDSCH/PUSCH. In some embodiments, if there is a DMRS mapping for one repetition, the DMRS may be frequency division multiplexed with data within W symbols. For example, within one PRB among PRBs scheduled for PDSCH/PUSCH, DMRS may be mapped to REs indexed by {0, 1, 2, 3, 6, 7, 8, 9} in the frequency domain, and data may be mapped to REs indexed by {4, 5, 10, 11} in the frequency domain. In some embodiments, for at least one of the k repetitions, no DMRS may be mapped within the W symbols of the repetition. Alternatively, no DMRS may be frequency division multiplexed with data within the repeated W symbols. For example, within one DMRS in PRBs scheduled for PDSCH/PUSCH, data may be mapped to REs indexed by {4, 5, 10, 11} in the frequency domain, and REs indexed by {0, 1, 2, 3, 6, 7, 8, 9} in the frequency domain may be left blank for the terminal device. For another example, within one PRB among PRBs scheduled for PDSCH/PUSCH, data may be mapped to REs indexed by {0, 1, 6, 7} in the frequency domain, and REs indexed by {2, 3, 4, 5, 8, 9, 10, 11} in the frequency domain may be left blank for the terminal device. In some embodiments, for the mth repetition of the k repetitions, there may be DMRSs mapped within W symbols. Optionally, there may be DMRS frequency division multiplexing with data. For example, within one PRB among PRBs scheduled for PDSCH/PUSCH, DMRS may be mapped to REs indexed by {0, 1, 2, 3, 6, 7, 8, 9} in the frequency domain, and data may be mapped to REs indexed by {4, 5, 10, 11} in the frequency domain. In some embodiments, m is an integer, and m may be one of {1, 2, 3, 4, 5, 6, 7, 8 }. In some embodiments, for the a-th, b-th, and c-th repetitions of the k repetitions, no DMRS may be mapped within the W symbols. In some embodiments, the a-th, b-th, and c-th repetitions may be mapped to the same W symbols. For example, within one PRB among PRBs scheduled for PDSCH/PUSCH, the a-th repeated data may be mapped to an RE indexed with {0, 1, 6, 7} in the frequency domain, the b-th repeated data may be mapped to an RE indexed with {2, 3, 8, 9} in the frequency domain, and the c-th repeated data may be mapped to an RE indexed with {4, 5, 10, 11} in the frequency domain. In some embodiments, a, b, and c are each integers, where a can be one of {2, 3, 4, 5, 6, 7, 8}, b can be one of {2, 3, 4, 5, 6, 7, 8}, c can be one of {2, 3, 4, 5, 6, 7, 8}, and where a ≠ b ≠ c.

In some embodiments, there may be k repetitions associated with the same TCI state. For the first repetition of the k repetitions, the repeated symbol length may be L, and the number of DMRS symbols in the repetition may be M. For at least one of the remaining k-1 repetitions, a repeated symbol length may not exceed L and/or a number of DMRS symbols in the repetition may not exceed M. In some embodiments, M ═ 1. In this case, for the first of the k repetitions, the first symbol in the repetition (e.g., whose symbol index is 1) may be used for the DMRS. In some embodiments, for at least one of the remaining k-1 repetitions, no symbols may be used for the DMRS. That is, DMRS transmission/reception may be disabled in repetition. Alternatively, or additionally, for at least one of the remaining k-1 repetitions, there may be one symbol for the DMRS, and the location of the DMRS symbol may not be the first symbol in the repetition. For example, the symbol index of the DMRS symbol is X, where X is an integer and 2 ≦ X ≦ L. Optionally, in some embodiments, M-2. In this case, for the first of the k repetitions, there may be two DMRS symbols, where the two DMRS symbols may include the first symbol in the repetition (e.g., whose symbol index is 1) and another symbol in the repetition (e.g., whose symbol index is X, where X is an integer and 2 ≦ X ≦ L). In some embodiments, there may be no DMRS symbols for at least one of the remaining k-1 repetitions. That is, DMRS transmission/reception may be disabled in repetition. Alternatively, or additionally, for at least one of the remaining k-1 repetitions, there may be one symbol for the DMRS, and the location of the DMRS symbol may be the first symbol in the repetition. Alternatively, or additionally, for at least one of the remaining k-1 repetitions, there may be one symbol for the DMRS, and the position of the DMRS symbol may be X, where X is an integer and 2 ≦ X ≦ L in the repetition. Alternatively, or additionally, there may be two DMRS symbols for at least one of the remaining k-1 repetitions, and at least one of the positions of the two DMRS symbols in the repetition may be different from the position of the DMRS symbol in the first of the k repetitions. Alternatively, or additionally, for at least one of the remaining k-1 repetitions, there may be two symbols used for the DMRS, and the location of the first DMRS symbol in the repetition may be the first symbol in the repetition. Alternatively, or additionally, for at least one of the remaining k-1 repetitions, there may be two symbols used for the DMRS, and the location of the first DMRS symbol in the repetition may be the second symbol in the repetition. Alternatively, or additionally, for at least one of the remaining k-1 repetitions, there may be two symbols for the DMRS, and the position of the second DMRS symbol in the repetition may be Y, where Y is an integer and 2 ≦ Y ≦ L in the repetition, and where Y ≠ X.

In some embodiments, there may be k repetitions associated with the same TCI state. For the first repetition of the k repetitions, the repeated symbol length may be L, and the number of DMRS symbols in the repetition may be m. In the remaining k-1 repetitions, there may be at least one repetition with a symbol length below L and/or the number of DMRS symbols may be below m. That is, at least one symbol of the DMRS in at least one repetition may be omitted compared to a first repetition of the k repetitions.

In some embodiments, if two adjacent repetitions (e.g., which may be contiguous or non-contiguous across symbols) are associated with two different TCI states, the number of DMRS symbols in the latter repetition may be M (i.e., the maximum number of DMRS symbols in the repetition), and the symbol index of the first of the DMRS symbols in the latter repetition may be 2 (i.e., not the first symbol in the latter repetition). This is because the first symbol in the latter repetition may be affected by beam switching and/or Automatic Gain Control (AGC) adjustments.

In some embodiments, the network device may indicate to the terminal device the configuration of the redundancy version (hereinafter denoted as "RV"). In some embodiments, there may be an RV indication field (hereinafter denoted "RV") in this configuration_id") which may indicate the RV sequence to be applied to PDSCH/PUSCH repetition. In some embodiments, an RV may be present_idOr T available sequences of RV. In some embodiments, for RV_idDifferent values of (a) and/or different sequences of RVs, the order of repetition may beDifferent. In some embodiments, for the slave RV_idAnd/or a first set of sequences selected from the T available sequences of RVs, repetitions associated with the same TCI state may be transmitted contiguously. Further, the repetitions associated with the first TCI state may be sent first, and any one of the repetitions associated with the second TCI state may be sent after the repetition associated with the first TCI state. For example, for k repetitions associated with the same TCI state, there may be no transmit/receive opportunity associated with another TCI state between two adjacent ones of the k repetitions. In some embodiments, there may be a slave RV_idAnd/or a second set of sequences selected from the T available sequences of the RV. In some embodiments, each of the second set of values may be different from any of the first set of values. In some embodiments, each of the second set of RV sequences can be different from any of the first set of RV sequences. In some embodiments, for the slave RV_idAnd/or a second set of sequences selected from the T available sequences of RVs, repetitions associated with different TCI states may be transmitted contiguously. For example, for any pair of two adjacent repetitions, the two repetitions are associated with two different TCI states.

In some embodiments, the sequence of the RV may be one of: { 0231 }, { 2310 }, { 3102 }, { 1023 }, { 02 }, { 23 }, { 31 }, or { 10 }. Alternatively, any four adjacent RVs in the RV sequence may be { 0231 }, { 2310 }, { 3102 } or { 1023 }. Alternatively, any two adjacent RVs in the RV sequence may be 02, 23, 31, or 10. In some embodiments, in this case, if the number of configured TCI states for one repetition is 2 (e.g., denoted TCI-A and TCI-B hereinafter), and if the total number of repetitions is 4, the order of the associated TCI states for the four repetitions may be { TCI-A, TCI-A, TCI-B, TCI-B }. In some embodiments, if the number of configured TCI states for one repetition is 2 (e.g., denoted TCI-A and TCI-B hereinafter), and if the total number of repetitions is 8, the order of the 8 repeated associated TCI states may be { TCI-A, TCI-A, TCI-A, TCI-A, TCI-B, TCI-B, TCI-B, TCI-B }. In some embodiments, if the number of configured TCI states for a repetition is 4 (e.g., denoted TCI-A, TCI-B, TCI-C and TCI-D hereinafter), and if the total number of repetitions is 8, the order of the 8 repeated associated TCI states may be { TCI-A, TCI-A, TCI-B, TCI-B, TCI-C, TCI-C, TCI-D, TCI-D }.

In some embodiments, the sequence of the RV may be one of: { 0321 }, { 3210 }, { 2103 }, { 1032 }, { 03 }, { 21 }, { 32 }, { 10}, { 30 } and { 12 }. Optionally, any four adjacent RVs in the RV sequence are { 0321 }, { 3210 }, { 2103 }, or { 1032 }. Optionally, any two adjacent RVs in the RV sequence are { 03 }, { 21 }, { 32 }, { 10} or { 30 } or { 12 }. In some embodiments, in this case, if the number of configured TCI states for a repetition is 2 (e.g., denoted TCI-A and TCI-B hereinafter), and if the total number of repetitions is 4, the order of the four repeated associated TCI states may be { TCI-A, TCI-B, TCI-A, TCI-B }. In some embodiments, if the number of configured TCI states for a repetition is 2 (e.g., denoted TCI-A and TCI-B hereinafter), and if the total number of repetitions is 8, the order of the 8 repeated associated TCI states may be { TCI-A, TCI-B, TCI-A, TCI-B, TCI-A, TCI-B, TCI-A, TCI-B }. In some embodiments, if the number of configured TCI states for a repetition is 4 (e.g., denoted TCI-A, TCI-B, TCI-C and TCI-D hereinafter), and if the total number of repetitions is 8, the order of the 8 repeated associated TCI states may be { TCI-A, TCI-B, TCI-C, TCI-D, TCI-A, TCI-B, TCI-C, TCI-D }.

Fig. 4A illustrates an exemplary diagram of resource allocation in a conventional scheme. In FIG. 4A, there are two TCI states (i.e., TCI-A and TCI-B) and a total of 4 repetitions 410-1, 410-2, 410-3, and 410-4 (collectively or individually referred to as repetitions 410). I.e., N-2 and R-4. As shown in FIG. 4A, repetitions 410-1 and 410-2 are associated with TCI-A, and repetitions 410-3 and 410-4 are associated with TCI-B. Each repetition 410 may include 2 symbols, one for DMRS and one for data. That is, according to the conventional scheme, this case requires at least 8 symbols. According to an embodiment of the present disclosure, the DMRS symbols in repetitions 410-2 and 410-4 may be omitted. Fig. 4B illustrates an example diagram of resource allocation in accordance with an embodiment of the disclosure. As shown in fig. 4B, the DMRS symbols in repetitions 410-2 and 410-4 are omitted for better resource utilization.

In some embodiments, if the number of configured TCI states is N (e.g., N ═ 1, 2, 3, or 4), the number of repetitions for one of the N TCI states is k, and the length or maximum length for one repetition is L, the number of preceding DMRS symbols may be H (e.g., H may be 1 or 2).

In some embodiments, if k-2 and L-2, for the first repetition, the total number of symbols may be 2, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first or second of the 2 symbols. In some embodiments, for the second repetition, the total number of symbols may be 1 or 2 and the number of DMRS symbols may be 0. That is, there may be no DMRS mapping in the second repetition. In some embodiments, for the second repetition, the total number of symbols may be 2, the number of DMRS symbols may be 1, and the DMRS may be mapped to the second symbol of the 2 symbols.

In some embodiments, if k-3 and L-2, for the first and/or third repetition, the total number of symbols in one repetition may be 2, the number of DMRS symbols in the repetition may be 1, and the DMRS may be mapped to the first or second symbol of the 2 symbols in the repetition. In some embodiments, for the second repetition and/or the third repetition, the total number of symbols in one repetition may be 1 or 2, and the number of DMRS symbols in the repetition may be 0. That is, there may be no DMRS mapping in the second repetition and/or the third repetition. In some embodiments, for the third repetition, the total number of symbols may be 2, the number of DMRS symbols may be 1, and the DMRS may be mapped to the second of the 2 symbols.

In some embodiments, if k-4 and L-2, for the first and/or fourth repetitions, the total number of symbols in one repetition may be 2, the number of DMRS symbols in the repetition may be 1, and the DMRS may be mapped to the first or second of the 2 symbols in the repetition. In some embodiments, for the second repetition and/or the third repetition, the total number of symbols in one repetition may be 1 or 2, and the number of DMRS symbols in the repetition may be 0. That is, no DMRS may be mapped in the second repetition and/or the third repetition. In some embodiments, for the second, third, and/or fourth repetitions, the total number of symbols in one repetition may be 2, the number of DMRS symbols in the repetition may be 1, and a DMRS may be mapped to the second of the 2 symbols in the repetition.

In some embodiments, if k-2 and L-3, for the first repetition, the total number of symbols may be 3, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first or second of the L symbols. In some embodiments, for the second repetition, the total number of symbols may be 2 or 3 and the number of DMRS symbols may be 0. That is, no DMRS may be mapped in the second repetition. In some embodiments, for the second repetition, the total number of symbols may be 3, the number of DMRS symbols may be 1, and the DMRS may be mapped to the second symbol or the third symbol of the L symbols.

In some embodiments, if k-2 and L-4, for the first repetition, the total number of symbols may be 4, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first or second of the L symbols. In some embodiments, for the second repetition, the total number of symbols may be 3 or 4 and the number of DMRS symbols may be 0. That is, no DMRS may be mapped in the second repetition. In some embodiments, for the second repetition, the total number of symbols may be 4, the number of DMRS symbols may be 1, and the DMRS may be mapped to a third symbol or a fourth symbol of the L symbols.

In some embodiments, if k-2 and L-5, for the first repetition, the total number of symbols may be 5, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first or second of the L symbols. In some embodiments, for the second repetition, the total number of symbols may be 4 or 5 and the number of DMRS symbols may be 0. That is, no DMRS may be mapped in the second repetition. In some embodiments, for the second repetition, the total number of symbols may be 5, the number of DMRS symbols may be 1, and the DMRS may be mapped to a third, fourth, or fifth symbol of the L symbols.

In some embodiments, if k-2 and L-6, for the first repetition, the total number of symbols may be 6, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first or second of the L symbols. In some embodiments, for the second repetition, the total number of symbols may be 5 or 6, and the number of DMRS symbols may be 0. That is, no DMRS may be mapped in the second repetition. In some embodiments, for the second repetition, the total number of symbols may be 6, the number of DMRS symbols may be 1, and the DMRS may be mapped to a fourth symbol or a fifth symbol of the L symbols.

In some embodiments, if k-2 and L-7, for the first repetition, the total number of symbols may be 7, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first or second of the L symbols. In some embodiments, for the second repetition, the total number of symbols may be 6 or 7 and the number of DMRS symbols may be 0. That is, no DMRS may be mapped in the second repetition. In some embodiments, for the second repetition, the total number of symbols may be 7, the number of DMRS symbols may be 1, and the DMRS may be mapped to a fourth, fifth, sixth, or seventh symbol of the L symbols.

In some embodiments, if k-4 and L-3, for the first and/or fourth repetitions, the total number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1, and the DMRS may be mapped to the first or second of the 3 symbols in the repetition. In some embodiments, for the second, third, and/or fourth repetitions, the total number of symbols in one repetition may be 2 or 3, and the number of DMRS symbols in the repetition may be 0. That is, no DMRS may be mapped in the second repetition and/or the third repetition. In some embodiments, for the second, third, and/or fourth repetitions, the total number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1, and a DMRS may be mapped to the second of the 3 symbols in the repetition.

In some embodiments, if k-3 and L-3, for the first repetition and/or the third repetition, the total number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1, and the DMRS may be mapped to the first symbol or the second symbol of the 3 symbols in the repetition. In some embodiments, for the second and/or third repetitions, the total number of symbols in one repetition may be 2 or 3, and the number of DMRS symbols in the repetition may be 0. That is, no DMRS may be mapped in the second repetition and/or the third repetition. In some embodiments, for the second repetition and/or the third repetition, the total number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1, and a DMRS may be mapped to the second of the 3 symbols in the repetition.

In some embodiments, if k-3 and L-4, for the first and/or third repetition, the total number of symbols in one repetition may be 4, the number of DMRS symbols in the repetition may be 1, and the DMRS may be mapped to the first or second of the 4 symbols in the repetition. In some embodiments, for the second and/or third repetitions, the total number of symbols in one repetition may be 3 or 4, and the number of DMRS symbols in the repetition may be 0. That is, no DMRS may be mapped in the second repetition and/or the third repetition. In some embodiments, for the second repetition and/or the third repetition, the total number of symbols in one repetition may be 4, the number of DMRS symbols in the repetition may be 1, and a DMRS may be mapped to the second of the 4 symbols in the repetition.

In some embodiments, if k is 2 and L is 3, and if 2 or 3 additional DMRSs are configured or the value of the parameter DMRS-additive position is 'pos 2' or 'pos 3', the number of symbols in each repetition may be 3, the number of DMRS symbols in the repetition may be 1, and a DMRS may be mapped to the first symbol of the 3 symbols in the repetition for the first and second repetitions.

In some embodiments, if k is 2 and L is 3, and if 2 additional DMRSs are configured, or the value of the parameter DMRS-additive position is 'pos 2', the number of symbols may be 4, the number of DMRS symbols may be 2, and the DMRS may be mapped to a first symbol and a fourth symbol of the 4 symbols for the first repetition. Alternatively, or additionally, for the second repetition, the number of symbols may be 3, the number of DMRS symbols may be 1, and the DMRS may be mapped to the third symbol of the 3 symbols. In some embodiments, for the second repetition, the number of symbols may be 4, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first and fourth symbols of the 4 symbols. Alternatively, or additionally, for the first repetition, the number of symbols may be 3, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first symbol of the 3 symbols.

In some embodiments, if k is 2 and L is 4, and if 2 additional DMRSs are configured, or the value of the parameter DMRS-additive position is 'pos 2', the number of symbols may be 5, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first and fifth symbols of the 5 symbols for the first repetition. Alternatively, or additionally, for the second repetition, the number of symbols may be 4, the number of DMRS symbols may be 1, and the DMRS may be mapped to a fourth symbol of the 4 symbols. In some embodiments, for the second repetition, the number of symbols may be 5, the number of DMRS symbol mappings may be 2, and the DMRS may be mapped to the first symbol and the fifth symbol of the 5 symbols. Alternatively, or additionally, for the first repetition, the number of symbols may be 4, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first symbol of the 4 symbols.

In some embodiments, if k is 2 and L is 4, and if 3 additional DMRSs are configured or the value of the parameter DMRS-additional position is 'pos 3', the number of symbols may be 5, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first and fourth symbols of the 5 symbols for the first repetition. Alternatively, or additionally, for the second repetition, the number of symbols may be 4, the number of DMRS symbols may be 1, and the DMRS may be mapped to the second symbol of the 4 symbols. In some embodiments, for the first repetition, the number of symbols may be 4, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first and fourth symbols of the 4 symbols. Alternatively, or additionally, for the second repetition, the number of symbols may be 4, the number of DMRS symbols may be 1, and the DMRS may be mapped to the third symbol of the 4 symbols.

In some embodiments, if k is 2 and L is 5, and if 3 additional DMRSs are configured, or the value of the parameter DMRS-additive position is 'pos 3', the number of symbols may be 5 for the first repetition, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first and fourth symbols of the 5 symbols. Alternatively, or additionally, for the second repetition, the number of symbols may be 5, the number of DMRS symbols may be 2, and the DMRS may be mapped to the second symbol and the fifth symbol of the 5 symbols.

In some embodiments, if k is 2 and L is 5, and if 2 additional DMRSs are configured, or the value of the parameter DMRS-additive position is 'pos 2', the number of symbols may be 5 for the first repetition, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first and fifth symbols of the 5 symbols. Alternatively, or additionally, for the second repetition, the number of symbols may be 5, the number of DMRS symbols may be 1, and the DMRS may be mapped to a fourth symbol of the 5 symbols. In some embodiments, for the first repetition, the number of symbols may be 6, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first symbol and the fifth symbol of the 6 symbols. Alternatively, or additionally, for the second repetition, the number of symbols may be 5, the number of DMRS symbols may be 1, and the DMRS may be mapped to the third symbol of the 5 symbols.

In some embodiments, if k is 2 and L is 6, and if 3 additional DMRSs are configured or the value of the parameter DMRS-additional position is 'pos 3', the number of symbols in one repetition may be 6, the number of DMRS symbols in a repetition may be 2, and the DMRS may be mapped to the first and fourth symbols of the 6 symbols in the repetition for the first and second repetitions.

In some embodiments, if k is 2 and L is 6, and if 2 additional DMRSs are configured, or the value of the parameter DMRS-additive position is 'pos 2', the number of symbols may be 6 for the first repetition, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first and sixth symbols of the 6 symbols. Alternatively, or additionally, for the second repetition, the number of symbols may be 6, the number of DMRS symbols may be 1, and the DMRS may be mapped to a fourth symbol of the 6 symbols.

In some embodiments, if k-4 and L-3, and if 2 additional DMRSs are configured, or the parameter DMRS-additional position has a value of 'pos 2', the number of symbols in one repetition may be 3, the number of DMRS symbols in a repetition may be 1, and a DMRS may be mapped to the first of 3 symbols in a repetition for the first and/or fourth repetition. Alternatively, or additionally, for the second repetition, the number of symbols may be 3, the number of DMRS symbols may be 1, and the DMRS may be mapped to the second symbol of the 3 symbols. Alternatively, or additionally, for the third repetition and/or the fourth repetition, the number of symbols in one repetition may be 2 and the number of DMRS symbols in the repetition may be 0. Alternatively, or additionally, for the third repetition, the number of symbols may be 3, the number of DMRS symbols may be 1, and the DMRS may be mapped to the third symbol of the 3 symbols.

In some embodiments, the available value of the number of repetitions, k, and the available value of the length or maximum length, L, of one repetition associated with one TCI state may be interdependent. In some embodiments, the number of available values and/or the available value of L may be different for different values of k. In some embodiments, the number of available values and/or the available values of k may be different for different values of L. For example, if k is 2, the available values of L may include at least one of 2, 3, 4, 5, 6, and 7. For another example, if k is 3, the available value of L may include at least one of 2, 3, and 4. For another example, if k is 4, the available value of L may include at least one of 2 and 3. For another example, if L ═ 2, the available values of k may include at least one of 2, 3, and 4. For another example, if L ═ 3, the available values of k may include at least one of 2, 3, and 4. For another example, if L ═ 4, the available value of k may include at least one of 2 and 3.

Fig. 5A-5B illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure. In FIGS. 5A-5B, it is assumed that there are two TCI states (i.e., TCI-A and TCI-B) and a total of 8 repetitions 510-1, 510-2, 510-3, and 510-4 (collectively or individually referred to as repetitions 510). Each repetition 510 includes at most 2 symbols. I.e., N-2, R-8, and L-2. As shown in fig. 5A, in some embodiments, repetitions 510-1 and 510-3 associated with TCI-a each include one DMRS symbol, while the DMRS symbols in repetitions 510-2 and 510-4 are omitted. The repetitions 510-5 and 510-7 associated with the TCI-B each include one DMRS symbol, and the DMRS symbols in the repetitions 510-6 and 510-8 are omitted. Alternatively, as shown in fig. 5B, the repetition 510-1 associated with TCI-a includes one DMRS symbol, while the DMRS symbols in the repetitions 510-2, 510-3, and 510-4 are omitted. The repetition 510-5 associated with TCI-B includes one DMRS symbol, while the DMRS symbols in the repetitions 510-6, 510-7, and 510-8 are omitted. In this way, 8 PDSCH or PUSCH repetitions may be achieved within one slot.

In some embodiments, the resource allocations for different repetitions may be different, as described above. For example, DMRS symbols may exist in different positions in different repetitions. Fig. 6 illustrates an example diagram of resource allocation in accordance with some embodiments of the present disclosure. In FIG. 6, it is assumed that there are two TCI states (i.e., TCI-A and TCI-B) and a total of 4 repetitions 610-1, 610-2, 610-3, and 610-4 (collectively or individually referred to as repetitions 610). Each repetition 610 comprises at most 3 symbols. Namely, N is 2, R is 4, and L is 3. As shown in FIG. 6, repetitions 610-1 and 610-2 are associated with TCI-A. However, the position of the DMRS symbol in repetition 610-1 and the position of the DMRS symbol in repetition 610-2 are different. Similarly, repetitions 610-3 and 610-4 are associated with TCI-B. However, the position of the DMRS symbol in repetition 610-3 and the position of the DMRS symbol in repetition 610-4 are different.

In some embodiments, the number of DMRS symbols and/or their position in each repetition may depend on at least one of: a number of additional DMRSs configured for a physical shared channel (e.g., PUSCH or PDSCH); a time slot format; the number of repetitions; the symbol length of each repetition; a resource mapping type of the physical shared channel (e.g., PDSCH mapping type a or PDSCH mapping type B as specified in 3GPP specification release 15); and one or more DMRS location parameters associated with the resource mapping type (e.g., DMRS-additional position for PDSCH mapping type a or PDSCH mapping type B as specified in release 15 of the 3GPP specifications). Fig. 7A-7E illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure. In FIGS. 7A-7E, it is assumed that there are two TCI states (i.e., TCI-A and TCI-B) and a total of 8 repetitions 710-1, 710-2 … 710-8 (collectively or individually referred to as repetitions 710). Each repetition 710 comprises at most 2 symbols. I.e., N-2, R-8, and L-2.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type B, and no additional DMRS is configured for PDSCH. In this case, 4 repetitions may be associated with the same TCI state, as shown in fig. 7A. The total number of symbols used for the 4 repeated DMRSs and data may be 5. Taking TCI-a as an example, for repetition 710-1, there are 2 symbols, where the first symbol is used for DMRS transmission/reception and the second symbol is used for data transmission/reception. For the remaining repetitions 710-2, 710-3, and 710-4, the DMRS symbols are omitted, and the symbol length of the repetition 710-2, 710-3, or 710-4 is 1.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type B, and the PDSCH is configured with one or more additional DMRSs. In this case, 4 repetitions may be associated with the same TCI state, as shown in fig. 7B. The total number of symbols used for the 4 repeated DMRSs and data may be 6. Taking TCI-a as an example, for repetitions 710-1 and 710-4, there are 2 symbols in each repetition, where the first symbol is used for DMRS transmission/reception and the second symbol is used for data transmission/reception. For the remaining repetitions 710-2 and 710-3, the DMRS symbols are omitted, and the symbol length of the repetition 710-2 or 710-3 is 1.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, and no additional DMRS is configured for PDSCH. In this case, the repeated resource allocation may be the same as that shown in fig. 7A.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, one additional DMRS is configured for PDSCH, and the parameter DMRS-additional position for PDSCH mapping type a is 2. In this case, in some embodiments, the resource allocation may be the same as that shown in fig. 7A. Alternatively, in some embodiments, repeated resource allocations may be shown in fig. 7C. As shown in fig. 7C, 4 repetitions may be associated with the same TCI state. The total number of symbols used for the 4 repeated DMRSs and data may be 6. Taking TCI-a as an example, for repetitions 710-1 and 710-4, there are 2 symbols in each repetition. The first symbol in repetition 710-1 and the second symbol in repetition 710-4 are used for DMRS transmission/reception, and the second symbol in repetition 710-1 and the first symbol in repetition 710-4 are used for data transmission/reception. For the remaining repetitions 710-2 and 710-3, the DMRS symbols are omitted, and the symbol length of the repetition 710-2 or 710-3 is 1.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, one additional DMRS is configured for PDSCH, and the parameter DMRS-additional position for PDSCH mapping type a is 3. In this case, for example, the resource allocation for repetition may be the same as that shown in fig. 7B.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, two additional DMRSs are configured for PDSCH, and the parameter DMRS-additional position for PDSCH mapping type a is 2. In this case, for example, the resource allocation for repetition may be the same as that shown in fig. 7B.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, two additional DMRSs are configured for PDSCH, and the parameter DMRS-additional position of PDSCH mapping type a is 3. In this case, for example, repeated resource allocation may be shown in fig. 7D or 7E.

In some embodiments, the number of DMRS symbols and/or their position in each repetition may depend on at least one of: a number of additional DMRSs configured for a physical shared channel (e.g., PUSCH or PDSCH); a time slot format; the number of repetitions; the symbol length of each repetition; a resource mapping type of the physical shared channel (e.g., PDSCH mapping type a or PDSCH mapping type B as specified in 3GPP specification release 15); and one or more DMRS location parameters associated with the resource mapping type (e.g., DMRS-additional position for PDSCH mapping type a or PDSCH mapping type B as specified in release 15 of the 3GPP specifications). Fig. 8A-8D illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure. In FIGS. 8A-8D, it is assumed that there are two TCI states (i.e., TCI-A and TCI-B) and a total of 4 repetitions 810-1, 810-2, 810-3, and 810-4 (collectively or individually referred to as repetitions 810). Each repetition 810 includes at most 3 symbols. Namely, N is 2, R is 4, and L is 3.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, and no additional DMRS is configured for PDSCH. In this case, 2 repetitions may be associated with the same TCI state, as shown in fig. 8A. The total number of symbols for the 2 repeated DMRSs and data may be 5. Taking TCI-a as an example, for repetition 810-1, there are 3 symbols, where the first symbol is used for DMRS transmission/reception and the remaining two symbols are used for data transmission/reception. For the remaining repetitions 810-2, the DMRS symbols are omitted, and the symbol length of the repetition 810-2 is 2.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, one additional DMRS is configured for PDSCH, and the parameter DMRS-additional position for PDSCH mapping type a is 2. In this case, in some embodiments, the resource allocation may be the same as that shown in fig. 8A. Alternatively, in some embodiments, repeated resource allocations may be shown in fig. 8B. As shown in fig. 8B, 2 repetitions may be associated with the same TCI state. The total number of symbols for the 2 repeated DMRSs and data may be 6. Taking repetitions 810-1 and 810-2 associated with TCI-a as an example, there are 3 symbols in each repetition, where the first symbol in repetition 810-1 and the last symbol in repetition 810-2 are used for DMRS transmission/reception and the remaining symbols in repetitions 810-1 and 810-2 are used for data transmission/reception.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, two additional DMRSs are configured for PDSCH, and the parameter DMRS-additional position for PDSCH mapping type a is 2. In this case, 2 repetitions may be associated with the same TCI state, as shown in fig. 8C. Taking repetitions 810-1 and 810-2 associated with TCI-a as an example, there are 3 symbols in each repetition, where the first symbol in repetition 810-1 and the second symbol in repetition 810-2 are used for DMRS transmission/reception and the remaining symbols in repetitions 810-1 and 810-2 are used for data transmission/reception.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, two additional DMRSs are configured for PDSCH, and the parameter DMRS-additional position of PDSCH mapping type a is 3. In this case, for example, the resource allocation for repetition may be the same as that shown in fig. 8A or 8B.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, and three additional DMRSs are configured for PDSCH. In this case, 2 repetitions may be associated with the same TCI state, as shown in fig. 8D. Taking repetitions 810-1 and 810-2 associated with TCI-a as an example, there are 3 symbols in each repetition, where the first symbol in repetition 810-1 and the first symbol in repetition 810-2 are used for DMRS transmission/reception and the remaining symbols in repetitions 810-1 and 810-2 are used for data transmission/reception.

In some embodiments, the number of DMRS symbols and/or their position in each repetition may depend on at least one of: a number of additional DMRSs configured for a physical shared channel (e.g., PUSCH or PDSCH); a time slot format; the number of repetitions; the symbol length of each repetition; a resource mapping type of the physical shared channel (e.g., PDSCH mapping type a or PDSCH mapping type B as specified in 3GPP specification release 15); and one or more DMRS location parameters associated with the resource mapping type (e.g., DMRS-additional position for PDSCH mapping type a or PDSCH mapping type B as specified in release 15 of the 3GPP specifications). Fig. 9A-9C illustrate exemplary diagrams of resource allocation according to some embodiments of the present disclosure. In FIGS. 9A-9C, it is assumed that there are two TCI states (i.e., TCI-A and TCI-B) and a total of 4 repetitions 910-1, 910-2, 910-3, and 910-4 (collectively or individually referred to as repetitions 910). Each repetition 910 includes at most 4 symbols. Namely N-2, R-4 and L-4.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, and no additional DMRS is configured for PDSCH. In this case, 2 repetitions may be associated with the same TCI state, as shown in fig. 9A. The total number of symbols for the 2 repeated DMRSs and data may be 7. Taking TCI-a as an example, for repetition 910-1, there are 4 symbols, of which the first symbol is used for DMRS transmission/reception and the remaining three symbols are used for data transmission/reception. For the remaining repetitions 910-2, the DMRS symbols are omitted, and the symbol length of the repetition 910-2 is 3.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, one additional DMRS is configured for PDSCH, and the parameter DMRS-additional position for PDSCH mapping type a is 2. In this case, 2 repetitions may be associated with the same TCI state, as shown in fig. 9B. The total number of symbols for the 2 repeated DMRSs and data may be 8. Taking the repetitions 910-1 and 910-2 associated with TCI-a as an example, there are 4 symbols in each repetition, where the first symbol in repetition 910-1 and the last symbol in repetition 910-2 are used for DMRS transmission/reception and the remaining symbols in repetitions 910-1 and 910-2 are used for data transmission/reception.

In some embodiments, for example, the physical shared channel is PDSCH, the resource mapping type is PDSCH mapping type a, one additional DMRS is configured for PDSCH, and the parameter DMRS-additional position for PDSCH mapping type a is 3. In this case, 2 repetitions may be associated with the same TCI state, as shown in fig. 9C. The total number of symbols for the 2 repeated DMRSs and data may be 8. Taking the repetitions 910-1 and 910-2 associated with TCI-a as an example, there are 4 symbols in each repetition, where the first symbol in repetition 910-1 and the third symbol in repetition 910-2 are used for DMRS transmission/reception and the remaining symbols in repetitions 910-1 and 910-2 are used for data transmission/reception.

In some embodiments, for the nth and (n +1) th repetitions of the R repetitions, the (n +1) th repeated DMRS may be mapped onto the second or third symbol within the repetition if the associated TCI states of the two repetitions are different.

In view of the above, it can be seen that embodiments of the present disclosure provide solutions for DMRS transmission and reception in multi-TRP communications. The solution disables DMRS transmission and reception in at least one PDSCH or PUSCH repetition. Furthermore, the solution allows different resource patterns to be used in different repetitions. Thus, this solution may enable better resource utilization. In addition, the solution can also achieve backward compatibility of scheduling of PDSCH or PUSCH repetition in multi-TRP communication, thereby achieving high performance.

Fig. 10 illustrates an example method 1000 in accordance with some embodiments of the present disclosure. In some embodiments, for example, method 1000 may be performed at device 201 as shown in fig. 2. It should be understood that method 1000 may include additional blocks not shown and/or may omit some of the blocks shown, and the scope of the present disclosure is not so limited.

At block 1010, the device 201 determines control information for a scheduled physical shared channel. The control information indicates a plurality of TCI states for communicating with device 202 on the physical shared channel.

At block 1020, a plurality of transmission occasions of the physical shared channel are configured to be scheduled by the control information, from which the device 201 determines a set of transmission occasions associated with one of the plurality of TCI states.

In some embodiments, the device 201 may determine the set of transmission opportunities associated with the TCI state such that the set of transmission opportunities are contiguous in a sub-slot or symbol.

In some embodiments, the device 201 may determine the set of transmission opportunities associated with the TCI states such that no transmission opportunity associated with another TCI state of the plurality of TCI states is available between two adjacent transmission opportunities in the set of transmission opportunities.

At block 1030, the device 201 determines, for the set of transmission occasions, respective resource allocations for transmission of the at least the one DMRS of the physical shared channel to the device 202.

In some embodiments, the device 201 may determine the resource allocation for the set of transmission occasions based on at least one of: a number of additional DMRSs configured for the physical shared channel; a time slot format; a number of the plurality of transmission occasions; a number of symbols occupied by one of the plurality of transmission opportunities; a resource mapping type of the physical shared channel; and one or more DMRS location parameters associated with the resource mapping type.

In some embodiments, the device 201 may determine, for one of the set of transmission occasions, a resource allocation for DMRS transmission in the transmission occasion. The resource allocation for the transmission occasion may indicate at least one of: a number of symbols used for DMRS transmission in the transmission occasion; and the corresponding position of the symbol in the slot.

In some embodiments, the set of transmission occasions includes at least a first transmission occasion and a second transmission occasion. The device 201 may determine a first resource allocation for DMRS transmission in the first transmission occasion and determine a second resource allocation for DMRS transmission in the second transmission occasion, wherein the second resource allocation is different from the first resource allocation.

In some embodiments, the device 201 may determine the resource allocation for the set of transmission occasions such that DMRS transmissions in at least one transmission occasion of the set of transmission occasions are disabled.

At block 1040, the device 201 transmits the at least one DMRS to the device 202 during the set of transmission occasions based on the resource allocation and the TCI status.

In some embodiments, device 201 is a terminal device, device 202 is a network device serving the terminal device or a TRP coupled to the network device, and the physical shared channel is a PUSCH.

In some embodiments, device 201 is a network device or a TRP coupled to the network device, device 202 is a terminal device served by the network device, and the physical shared channel is a PDSCH.

Fig. 11 illustrates an example method 1100 in accordance with some embodiments of the present disclosure. In some embodiments, for example, method 1100 may be performed at device 202 as shown in fig. 2. It should be understood that method 1100 may include additional blocks not shown and/or may omit some of the blocks shown, and the scope of the present disclosure is not so limited.

At block 1110, the device 202 determines control information for scheduling a physical shared channel. The control information indicates a plurality of TCI states for communicating with the device 201 on the physical shared channel.

At block 1120, in response to the plurality of receive opportunities of the physical shared channel being configured to be scheduled by the control information, the device 202 determines a set of receive opportunities associated with one of the plurality of TCI states from the plurality of receive opportunities.

In some embodiments, the device 202 can determine the set of receivers associated with the TCI state such that the set of receive opportunities are contiguous in a sub-slot or symbol.

In some embodiments, the device 202 can determine the set of receivers associated with the TCI state such that no receive opportunity associated with another TCI state of the plurality of TCI states is available between two adjacent receive opportunities of the set of receive opportunities.

At block 1130, the device 202 determines, for the set of receivers, respective resource allocations for receiving the at least one DMRS for the physical shared channel from the device 201.

In some embodiments, the device 202 may determine the resource allocation for the set of receivers based on at least one of: a number of additional DMRSs configured for the physical shared channel; a time slot format; a number of the plurality of receive opportunities; a number of symbols occupied by one of the plurality of receive opportunities; a resource mapping type of the physical shared channel; and one or more DMRS location parameters associated with the resource mapping type.

In some embodiments, the device 202 can determine, for one of the set of receivers, a resource allocation for DMRS reception in the reception occasion. The resource allocation may indicate at least one of: a number of symbols received for the DMRS in the reception occasion; and the corresponding position of the symbol in the slot.

In some embodiments, the plurality of receive opportunities may include at least a first receive opportunity and a second receive opportunity. The device 202 can determine a first resource allocation for DMRS reception in the first reception occasion and determine a second resource allocation for DMRS reception in a second reception occasion, wherein the first resource allocation is different than the second resource allocation.

In some embodiments, the device 202 can determine a resource allocation for the set of receivers such that DMRS reception in at least one reception opportunity of the set of reception opportunities is disabled.

At block 1140, the device 202 receives the at least one DMRS from the device 201 during the set of receivers based on the resource allocation and the TCI status.

In some embodiments, the device 202 is a network device or a TRP coupled to the network device, the first device 201 is a terminal device served by the network device, and the physical shared channel is a PUSCH.

In some embodiments, device 202 is a terminal device, device 201 is a network device serving the terminal device or a TRP coupled to the network device, and the physical shared channel is a PDSCH.

Fig. 12 is a simplified block diagram of an apparatus 1200 suitable for practicing embodiments of the present disclosure. Device 1200 may be considered a further example implementation of network device 110, TRP 120 or terminal device 130 as shown in fig. 1. Thus, device 1200 may be implemented at network device 110, TRP 120 or terminal device 130 or as at least a part of network device 110, TRP 120 or terminal device 130.

As shown, the apparatus 1200 includes: a processor 1210; a memory 1220 coupled to the processor 1210; a suitable Transmitter (TX) and Receiver (RX)1240 coupled to processor 1210; and a communications interface coupled to TX/RX 1240. Memory 1210 stores at least a portion of program 1230. TX/RX1240 is used for bi-directional communication. TX/RX1240 has at least one antenna to facilitate communications, but in practice there may be several antennas at the access node referred to in this application. The communication interface may represent any interface required for communication with other network elements, such as an X2 interface for bidirectional communication between enbs, an S1 interface for communication between a Mobility Management Entity (MME)/serving gateway (S-GW) and an eNB, a Un interface for communication between an eNB and a Relay Node (RN), or a Uu interface for communication between an eNB and a terminal device.

The programs 1230 are assumed to include program instructions that, when executed by the associated processor 1210, enable the device 1200 to operate in accordance with embodiments of the present disclosure as discussed herein with reference to fig. 1-11. The embodiments herein may be implemented by computer software executable by the processor 1210 of the device 1200, or by hardware, or by a combination of software and hardware. The processor 1210 may be configured to implement various embodiments of the present disclosure. Further, the combination of processor 1210 and memory 1220 may form a processing component 1250 suitable for implementing various embodiments of the present disclosure.

The memory 1220 may be of any type suitable for a local technology network, and may be implemented using any suitable data storage technology (e.g., non-transitory computer-readable storage media, semiconductor-based storage devices, magnetic storage devices and systems, optical storage devices and systems, fixed memory and removable memory, as non-limiting examples). Although only one memory 1220 is shown in device 1200, there may be multiple physically distinct memory modules in device 1200. As a non-limiting example, processor 1210 may be of any type suitable for a local technology network, and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs), and processors based on a multi-core processor architecture. Device 1200 may have multiple processors, such as application specific integrated circuit chips that are subordinate in time to a clock that synchronizes the host processor.

In general, the various embodiments of the disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While aspects of embodiments of the disclosure are illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product comprises computer executable instructions, such as those included in program modules, executed in a device on a target real processor or a target virtual processor to perform the processes or methods as described above with reference to fig. 6-7. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or separated between program modules as desired in various embodiments. Machine-executable instructions of the program modules may be executed within the local device or within the distributed device. In a distributed facility, program modules may be located in both local and remote memory storage media.

Program code for performing the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the functions/operations specified in the flowchart and/or block diagram can be implemented when the program codes are executed by the processor or controller. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

The program code described above may be embodied on a machine-readable medium, which may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

Further, while operations are described in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features specific to particular embodiments. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

Although the disclosure has been described in language specific to structural features and/or methodological acts, it is to be understood that the disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A method of communication, comprising:

determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of Transmission Control Indication (TCI) states to be used for communication with another device on the physical shared channel;

determining a set of transmission occasions associated with one of the plurality of TCI states from a plurality of transmission occasions in response to the plurality of transmission occasions of the physical shared channel being configured to be scheduled by the control information;

determining, for the set of transmission occasions, respective resource allocations for transmission of at least one demodulation reference signal (DMRS) of the physical shared channel to the other device; and

transmitting the at least one DMRS to the other device during the set of transmission occasions based on the resource allocation and the TCI status.

2. The method of claim 1, wherein determining the set of transmission occasions comprises:

determining the set of transmission opportunities associated with the TCI state such that the set of transmission opportunities are contiguous in a sub-slot or symbol.

3. The method of claim 1, wherein determining the set of transmission occasions comprises:

determining the set of transmission opportunities associated with the TCI state such that no transmission opportunity associated with another TCI state of the plurality of TCI states is available between two adjacent transmission opportunities in the set of transmission opportunities.

4. The method of claim 1, wherein determining the resource allocation comprises:

determining the resource allocation for the set of transmission occasions based on at least one of:

a number of additional DMRSs configured for the physical shared channel;

a time slot format;

a number of the plurality of transmission occasions;

a number of symbols occupied by one of the plurality of transmission opportunities;

a resource mapping type of the physical shared channel; and

one or more DMRS location parameters associated with the resource mapping type.

5. The method of claim 1, wherein determining the resource allocation comprises:

determining, for one of the set of transmission occasions, a resource allocation for a DMRS transmission in the transmission occasion,

wherein the resource allocation indicates at least one of:

a number of symbols to be used for the DMRS transmission in the transmission occasion; and

the corresponding position of the symbol in the slot.

6. The method of claim 1, wherein the set of transmission occasions comprises at least a first transmission occasion and a second transmission occasion, and wherein determining the resource allocation comprises:

determining a first resource allocation for a DMRS transmission in the first transmission occasion; and

determining a second resource allocation for DMRS transmission in the second transmission occasion,

wherein the second resource allocation is different from the first resource allocation.

7. The method of claim 1, wherein determining the resource allocation comprises:

determining the resource allocation for the set of transmission occasions such that DMRS transmission is disabled in at least one transmission occasion of the set of transmission occasions.

8. The method of claim 1, wherein:

the device is a terminal device;

the other device is a network device serving the terminal device or a Transmit and Receive Point (TRP) coupled to the network device; and is

The physical shared channel is a Physical Uplink Shared Channel (PUSCH).

9. The method of claim 1, wherein:

the device is a network device or a TRP coupled to the network device;

the other device is a terminal device served by the network device; and is

The physical shared channel is a Physical Downlink Shared Channel (PDSCH).

10. A method of communication, comprising:

determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of Transmission Control Indication (TCI) states to be used for communicating with another device on the physical shared channel;

determining a set of receive opportunities associated with one of the plurality of TCI states from the plurality of receive opportunities in response to a plurality of receive opportunities of the physical shared channel being configured to be scheduled by the control information;

determining, for the set of reception occasions, respective resource allocations for receiving at least one demodulation reference signal (DMRS) of the physical shared channel from the other device; and

receiving the at least one DMRS from the other device during the set of reception occasions based on the resource allocation and the TCI status.

11. The method of claim 10, wherein determining the set of receive opportunities comprises:

determining the set of receive opportunities associated with the TCI state such that the set of receive opportunities are contiguous in a sub-slot or symbol.

12. The method of claim 10, wherein determining the set of receive opportunities comprises:

determining the set of receive opportunities associated with the TCI state such that no receive opportunity associated with another TCI state of the plurality of TCI states is available between two adjacent receive opportunities in the set of receive opportunities.

13. The method of claim 10, wherein determining the resource allocation comprises:

determining the resource allocation based on at least one of:

a number of additional DMRSs configured for the physical shared channel;

a time slot format;

a number of the plurality of receive opportunities;

a number of symbols occupied by one of the plurality of receive opportunities;

a resource mapping type of the physical shared channel; and

one or more DMRS location parameters associated with the resource mapping type.

14. The method of claim 10, wherein determining the resource allocation comprises:

determining, for one of the set of reception occasions, a resource allocation received for the DMRS in the reception occasion,

wherein the resource allocation indicates at least one of:

a number of symbols to be used for DMRS reception in the reception occasion; and

the corresponding position of the symbol in the slot.

15. The method of claim 10, wherein the plurality of receive occasions comprises at least a first receive occasion and a second receive occasion, and wherein determining the resource allocation comprises:

determining a first resource allocation received for the DMRS in the first reception occasion; and

determining a second resource allocation received for the DMRS in the second reception occasion,

wherein the first resource allocation is different from the second resource allocation.

16. The method of claim 10, wherein determining the resource allocation comprises:

determining the resource allocation for the set of reception occasions such that DMRS reception is disabled in at least one reception occasion of the set of reception occasions.

17. The method of claim 1, wherein:

the device is a network device or a Transmit and Receive Point (TRP) coupled to the network device;

the other device is a terminal device served by the network device; and is

The physical shared channel is a Physical Uplink Shared Channel (PUSCH).

18. The method of claim 1, wherein:

the device is a terminal device;

the other device is a network device serving the terminal device or a TRP coupled to the network device; and is

The physical shared channel is a Physical Downlink Shared Channel (PDSCH).

19. A communication device, comprising:

a processor; and

a memory coupled to the processor and storing instructions thereon that, when executed by the processor, cause the apparatus to perform the method of any of claims 1-9.

20. A communication device, comprising:

a processor; and

a memory coupled to the processor and storing instructions thereon that, when executed by the processor, cause the apparatus to perform the method of any of claims 10-18.

21. A computer-readable medium having instructions stored thereon, which when executed on at least one processor causes the at least one processor to perform the method according to any one of claims 1 to 9.

22. A computer-readable medium having instructions stored thereon, which when executed on at least one processor causes the at least one processor to perform the method according to any one of claims 10 to 18.