Method and apparatus for demodulation reference signal modification for multi-signaling multi-transmission reception point operation

Abstract

The present disclosure provides systems, methods, and apparatus (including computer programs encoded on computer storage media) for collision avoidance procedures for demodulation reference signals (DMRS) and cell-specific reference signals (CRS) for wireless communications. Conventional networks and devices may not be able to perform DMRS shifts in certain modes. For example, when considering two transmissions in a multi-TRP mode, if the DMRS symbols used for one transmission are shifted due to a conflict with the CRS pattern, the alignment of these transmissions may be changed. If the DMRS symbols of these transmissions are not aligned, interference or decoding failure may occur. The present disclosure implements procedures for performing DMRS shifts in a multi-TRP mode. For example, the DMRS symbols of the two transmissions may be shifted in response to determining an overlap of one transmission. Such shifts may enable the DMRS positions of the two transmissions to be aligned to enable decoding of these transmissions.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Patent Application No. 17 / 013,514, filed on September 4, 2020, entitled “DEMODULATION REFERENCE SIGNALMODIFICATIONS FOR MULTIPLE SIGNALING, MULTIPLE TRANSMISSION RECEPTION POINT OPERATION,” and U.S. Provisional Patent Application No. 62 / 902,836, filed on September 19, 2019, entitled “DEMODULATION REFERENCE SIGNAL(DMRS) MODIFICATIONS FOR MULTIPLE SIGNALING, MULTIPLE TRANSMISSION RECEPTION POINT(TRP) OPERATION,” both of which are expressly incorporated herein by reference in their entirety. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communication systems, and more particularly to demodulation reference signal (DMRS) and cell-specific reference signal (CRS) collision avoidance procedures.

[0004] Related technical description

[0005] Wireless communication networks are widely deployed to provide various communication services, such as voice, video, packet data, messaging, broadcasting, etc. These wireless networks can be multiple access networks that can support multiple users by sharing available network resources. Such networks, which are usually multiple access networks, support the communication of multiple users by sharing available network resources. An example of such a network is the Universal Terrestrial Radio Access Network (UTRAN). UTRAN is a radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), which is a third generation (3G) mobile phone technology supported by the Third Generation Partnership Project (3GPP). Examples of multiple access network formats include code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, and single carrier FDMA (SC-FDMA) networks.

[0006] A wireless communication network may include several base stations or B nodes that can support several user equipment (UE) communications. UE may communicate with the base station via a downlink (DL) and an uplink (UL). DL (or forward link) refers to a communication link from a base station to a UE, and UL (or reverse link) refers to a communication link from a UE to a base station. The base station may transmit data and control information to the UE on a downlink, or may receive data and control information from the UE on an uplink. On the downlink, the transmission from the base station may encounter interference caused by transmissions from neighboring base stations or from other wireless radio frequency (RF) transmitters. On the uplink, the transmission from the UE may encounter uplink transmissions from other UEs communicating with neighboring base stations or interference from other wireless RF transmitters. The interference may degrade the performance of both the downlink and uplink.

[0007] As the demand for mobile broadband access continues to grow, the potential for interference and congested networks continues to grow as more UEs access long-range wireless communication networks and more short-range wireless systems are being deployed in communities. Research and development continues to advance UMTS technologies to not only meet the growing demand for mobile broadband access, but also to improve and enhance the user experience of mobile communications.

[0008] Overview

[0009] The systems, methods, and devices of the disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.

[0010] An innovative aspect of the subject matter described in the present disclosure may be implemented in a wireless communication method. The method includes receiving, by a user equipment (UE), a first message scheduling a first transmission; and receiving, by the UE, a second message scheduling a second transmission. The first transmission is associated with a first demodulation reference signal (DMRS), and the second transmission is associated with a second DMRS. The method further includes determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with a first DMRS or a second DMRS, wherein in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of the first DMRS or the second DMRS, the UE modifies at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS.

[0011] In some implementations, modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS may include modifying at least one DMRS symbol of the first DMRS and at least one DMRS symbol of the second DMRS.

[0012] In some implementations, the method may include receiving, by the UE, a first transmission, the first transmission having modified DMRS symbols. In some such implementations, the method may include receiving, by the UE, a second transmission, the second transmission having modified DMRS symbols.

[0013] In some implementations, the first message corresponds to a first transmit reception point (TRP) and the second message corresponds to a second TRP.

[0014] In some implementations, the UE is operating in a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode.

[0015] In some implementations, the first TRP is associated with a first CRS pattern and the second TRP is associated with a second CRS pattern.

[0016] In some implementations, the first message corresponds to downlink control information (DCI).

[0017] In some implementations, the first message is a periodic grant and corresponds to a downlink control information (DCI) or a radio resource control (RRC) message configured to schedule a plurality of transmissions including the first transmission.

[0018] In some implementations, the first message is received on a physical downlink control channel (PDCCH).

[0019] In some implementations, the first transmission is received on a physical downlink shared channel (PDSCH).

[0020] In some implementations, modifying at least one DMRS symbol of the first DMRS or the second DMRS may include adjusting a position of the at least one DMRS symbol of the first DMRS.

[0021] In some implementations, modifying at least one DMRS symbol of the first DMRS or the second DMRS may include: incrementing the position value of each DMRS symbol of the first DMRS of the first transmission by 1; and incrementing the position value of each DMRS symbol of the second DMRS of the second transmission by 1.

[0022] In some implementations, the method may include determining whether the first transmission at least partially overlaps with the second transmission.

[0023] In some implementations, determining whether the one or more CRS patterns overlap with the first DMRS or the second DMRS is performed in response to determining that first resources of the first transmission at least partially overlap with second resources of the second transmission.

[0024] In some implementations, the first resources of the first transmission are orthogonal to the second resources of the second transmission in the time domain, the frequency domain, or both.

[0025] In some implementations, first resources of a first transmission do not overlap with second resources of a second transmission in the time domain, the frequency domain, or both.

[0026] In some implementations, the UE performs DMRS shifting for multiple downlink control information (DCI) multiple transmission reception point (TRP) mode independent of CRS and TRP association.

[0027] In some implementations, the UE performs DMRS shifting across multiple transmit receive points (TRPs), and the UE performs rate matching per TRP.

[0028] In some implementations, the first message corresponds to a first transmission reception point (TRP) or a first control resource set (CORESET) group, and the second message corresponds to a second TRP or a second CORESET group, and the first CORESET group and the second CORESET group are indicated by higher layer signaling.

[0029] In some implementations, the method may include: before receiving the first message, transmitting, by the UE, a capability message indicating that the UE is configured to perform DMRS shifting for a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode.

[0030] In some implementations, the method may include, prior to receiving the first message, receiving, by the UE, a message indicating that the UE is to perform DMRS shifting for a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode.

[0031] Another innovative aspect of the subject matter described in the present disclosure may be implemented in a device configured for wireless communication. The device includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to: receive, by a user equipment (UE), a first message scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The at least one processor is also configured to: receive, by the UE, a second message scheduling a second transmission, the second transmission being associated with a second DMRS. The at least one processor is configured to: determine, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with a first DMRS or a second DMRS. The at least one processor is further configured to: modify, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of the first DMRS or the second DMRS.

[0032] In some implementations, the device is configured to perform a method as described in any of the implementations described above.

[0033] Another innovative aspect of the subject matter described in the present disclosure may be implemented in a device configured for wireless communication. The device includes a device for receiving, by a user equipment (UE), a first message scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The device also includes a device for receiving, by the UE, a second message scheduling a second transmission, the second transmission being associated with a second DMRS. The device includes a device for determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with a first DMRS or a second DMRS. The device further includes a device for modifying, by the UE, at least one DMRS symbol of a first DMRS or at least one DMRS symbol of a second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of a first DMRS or a second DMRS.

[0034] In some implementations, the device is configured to perform a method as described in any of the implementations described above.

[0035] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations, including receiving, by a user equipment (UE), a first message scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The operations also include receiving, by the UE, a second message scheduling a second transmission, the second transmission being associated with a second DMRS. The operations include determining, by the UE, whether one or more cell-specific reference signal (CRS) patterns overlap with a first DMRS or a second DMRS. The operations further include modifying, by the UE, at least one DMRS symbol of a first DMRS or at least one DMRS symbol of a second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of a first DMRS or a second DMRS.

[0036] In some implementations, the processor is configured to perform the method as described in any of the implementations described above.

[0037] Another innovative aspect of the subject matter described in the present disclosure may be implemented in a wireless communication method. The method includes transmitting, by a network entity, a first message scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The method also includes transmitting, by the network entity, a second message scheduling a second transmission, the second transmission being associated with a second DMRS. The method includes determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with a first DMRS or a second DMRS. The method further includes modifying, by the network entity, at least one DMRS symbol of a first DMRS or at least one DMRS symbol of a second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of a first DMRS or a second DMRS.

[0038] In some implementations, modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS may include modifying the at least one DMRS symbol of the first DMRS and the at least one DMRS symbol of the second DMRS.

[0039] In some implementations, the method may include transmitting, by the network entity, a first transmission having a modified DMRS symbol. In some such implementations, the method may include transmitting, by the network entity, a second transmission having a modified DMRS symbol.

[0040] In some implementations, the first message corresponds to a first transmit reception point (TRP) and the second message corresponds to a second TRP.

[0041] In some implementations, the network entity is operating in a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode.

[0042] In some implementations, the first TRP is associated with a first CRS pattern and the second TRP is associated with a second CRS pattern.

[0043] In some implementations, the first message corresponds to downlink control information (DCI).

[0044] In some implementations, the first message is a periodic grant and corresponds to a downlink control information (DCI) or a radio resource control (RRC) message configured to schedule a plurality of transmissions including the first transmission.

[0045] In some implementations, the first message is received on a physical downlink control channel (PDCCH).

[0046] In some implementations, the first transmission is received on a physical downlink shared channel (PDSCH).

[0047] In some implementations, modifying at least one DMRS symbol of the first DMRS or the second DMRS may include adjusting a position of the at least one DMRS symbol of the first DMRS.

[0048] In some implementations, modifying at least one DMRS symbol of the first DMRS or the second DMRS may include: incrementing the position value of each DMRS symbol of the first DMRS of the first transmission by 1; and incrementing the position value of each DMRS symbol of the second DMRS of the second transmission by 1.

[0049] In some implementations, first resources of a first transmission partially overlap with second resources of a second transmission in the time domain, the frequency domain, or both.

[0050] In some implementations, the first resources of the first transmission completely overlap with the second resources of the second transmission in the time domain, the frequency domain, or both.

[0051] In some implementations, the first resources of the first transmission are orthogonal to the second resources of the second transmission in the time domain, the frequency domain, or both.

[0052] In some implementations, first resources of a first transmission do not overlap with second resources of a second transmission in the time domain, the frequency domain, or both.

[0053] In some implementations, a network entity performs DMRS shifting for a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode independent of CRS and TRP association.

[0054] In some implementations, the network entity performs DMRS shifting across multiple transmit reception points (TRPs), and the network entity performs rate matching per TRP.

[0055] In some implementations, the first message corresponds to a first transmission reception point (TRP) or a first control resource set (CORESET) group, and the second message corresponds to a second TRP or a second CORESET group, and the first CORESET group and the second CORESET group are indicated by higher layer signaling.

[0056] In some implementations, the method may include: before transmitting the first message, receiving, by the network entity, a capability message indicating that the UE is configured for DMRS shifting for a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode.

[0057] In some implementations, the method may include: before transmitting the first message, transmitting, by the network entity, a message indicating that a user equipment (UE) is to perform DMRS shifting for a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode.

[0058] Another innovative aspect of the subject matter described in the present disclosure may be implemented in a device configured for wireless communication. The device includes at least one processor, and a memory coupled to the at least one processor. The at least one processor is configured to: transmit, by a network entity, a first message scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The at least one processor is also configured to: transmit, by the network entity, a second message scheduling a second transmission, the second transmission being associated with a second DMRS. The at least one processor is configured to: determine, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with a first DMRS or a second DMRS. The at least one processor is further configured to: modify, by the network entity, at least one DMRS symbol of a first DMRS or at least one DMRS symbol of a second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of a first DMRS or a second DMRS.

[0059] In some implementations, the device is configured to perform a method as described in any of the implementations described above.

[0060] Another innovative aspect of the subject matter described in the present disclosure may be implemented in a device configured for wireless communication. The device includes a device for transmitting, by a network entity, a first message for scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The device also includes a device for transmitting, by the network entity, a second message for scheduling a second transmission, the second transmission being associated with a second DMRS. The device includes a device for determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with a first DMRS or a second DMRS. The device further includes a device for modifying, by the network entity, at least one DMRS symbol of a first DMRS or at least one DMRS symbol of a second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of a first DMRS or a second DMRS.

[0061] In some implementations, the device is configured to perform a method as described in any of the implementations described above.

[0062] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations, the operations comprising: transmitting, by a network entity, a first message scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The operations also include transmitting, by the network entity, a second message scheduling a second transmission, the second transmission being associated with a second DMRS. The operations include determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with a first DMRS or a second DMRS. The operations further include modifying, by the network entity, at least one DMRS symbol of a first DMRS or at least one DMRS symbol of a second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of a first DMRS or a second DMRS.

[0063] In some implementations, the processor is configured to perform the method as described in any of the implementations described above.

[0064] Another innovative aspect of the subject matter described in the present disclosure may be implemented in a wireless communication method. The method includes transmitting, by a network entity, a first message scheduling a first transmission, the first transmission being associated with a first demodulation reference signal (DMRS). The method also includes determining, by the network entity, whether one or more cell-specific reference signal (CRS) patterns overlap with the first DMRS. The method includes modifying, by the network entity, at least one DMRS symbol of the first DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of the first DMRS. The method further includes transmitting, by the network entity, a first transmission having a modified DMRS symbol.

[0065] In some implementations, the method may include determining, by the network entity, whether the one or more CRS patterns overlap with a second DMRS associated with a second transmission performed by another network entity, wherein modifying at least one DMRS symbol of the first DMRS is further responsive to determining whether the at least one CRS pattern among the one or more CRS patterns overlaps with at least one DMRS symbol of the second DMRS.

[0066] In some implementations, the method may include modifying, by the network entity, at least one DMRS symbol of the second DMRS in response to determining that at least one of the one or more CRS patterns overlaps with at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS.

[0067] Another innovative aspect of the subject matter described in the present disclosure may be implemented in a wireless communication method. The method includes receiving, by a user equipment (UE), a configuration message including at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein a list in the at least one list is associated with a control resource set (CORESET) group. The method also includes receiving, by the UE, a first message scheduling a first transmission, and receiving, by the UE, a second message scheduling a second transmission. The first transmission is associated with a first demodulation reference signal (DMRS) and is for the component carrier, and the second transmission is associated with a second DMRS and is for the component carrier. The method further includes modifying, by the UE, at least one DMRS symbol of a first DMRS or at least one DMRS symbol of a second DMRS configured for the component carrier based on the list.

[0068] In some implementations, the first transmission is associated with the CORESET group and the second transmission is associated with a second CORESET group.

[0069] In some implementations, determining that the at least one list is configured for DMRS shifting indicates that one or more CRS patterns overlap with the first DMRS or the second DMRS.

[0070] In some implementations, the method may include determining, by the UE, whether one or more CRS patterns of the at least one list overlap with a first DMRS or a second DMRS, and wherein modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS is further responsive to determining that at least one CRS pattern of the one or more CRS patterns overlaps with at least one DMRS symbol of the first DMRS or the second DMRS.

[0071] In some implementations, the at least one CRS pattern list is configured for the component carrier to enable DMRS shifting, rate matching, or both.

[0072] In some implementations, modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS may include modifying the at least one DMRS symbol of the first DMRS and the at least one DMRS symbol of the second DMRS.

[0073] In some implementations, the method may include receiving, by a UE, a first transmission, the first transmission having modified DMRS symbols.

[0074] In some implementations, the method may include receiving, by a UE, a first transmission, the first transmission having modified DMRS symbols.

[0075] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a device for wireless communication. The device includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to: receive a configuration message, the configuration message including at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein the list in the at least one list is associated with a control resource set (CORESET) group. The processor is also configured to: receive a first message scheduling a first transmission, and receive a second message scheduling a second transmission. The first transmission is associated with a first demodulation reference signal (DMRS) and is for the component carrier, and the second transmission is associated with a second DMRS and is for the component carrier. The processor is further configured to: modify at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS based on the list being configured for the component carrier.

[0076] In some implementations, the device is operating in a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode.

[0077] In some implementations, a second CORESET group is associated with a second CRS pattern list of the at least one CRS pattern list.

[0078] In some implementations, the first message is received on a physical downlink control channel (PDCCH) and the first transmission is received on a physical downlink shared channel (PDSCH).

[0079] In some implementations, modifying at least one DMRS symbol of the first DMRS or the second DMRS may include adjusting a position of the at least one DMRS symbol of the first DMRS.

[0080] In some implementations, modifying at least one DMRS symbol of the first DMRS or the second DMRS may include: incrementing the position value of each DMRS symbol of the first DMRS of the first transmission by 1; and incrementing the position value of each DMRS symbol of the second DMRS of the second transmission by 1.

[0081] In some implementations, the device performs DMRS shifting for a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode independent of CRS and TRP association.

[0082] In some implementations, the device performs DMRS shifting across multiple transmit receive points (TRPs), and the device performs rate matching per TRP.

[0083] Another innovative aspect of the subject matter described in the present disclosure may be implemented in a wireless communication method. The method includes transmitting, by a network entity, a configuration message including at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein a list in the at least one list is associated with a control resource set (CORESET) group. The method also includes transmitting, by the network entity, a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier. The method includes transmitting, by the network entity, a second message scheduling a second transmission associated with a second DMRS and for the component carrier. The method further includes modifying, by the network entity, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier.

[0084] In some implementations, the first transmission is associated with the CORESET group and the second transmission is associated with a second CORESET group.

[0085] In some implementations, modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS may include modifying the at least one DMRS symbol of the first DMRS and the at least one DMRS symbol of the second DMRS.

[0086] In some implementations, the method may include: transmitting, by the network entity, a first transmission having a modified DMRS symbol; transmitting, by the network entity, a second transmission having a modified DMRS symbol; or both.

[0087] In some implementations, a second CORESET group is associated with a second CRS pattern list of the at least one CRS pattern list.

[0088] In some implementations, the first message corresponds to downlink control information (DCI).

[0089] In some implementations, the first message is a periodic grant and corresponds to a downlink control information (DCI) or a radio resource control (RRC) message configured to schedule a plurality of transmissions including the first transmission.

[0090] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a device for wireless communication. The device includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to: transmit a configuration message, the configuration message including at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein the list in the at least one list is associated with a control resource set (CORESET) group. The at least one processor is also configured to: transmit a first message that schedules a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier. The at least one processor is configured to: transmit a second message that schedules a second transmission associated with a second DMRS and for the component carrier. The at least one processor is further configured to: modify at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier.

[0091] In some implementations, modifying at least one DMRS symbol of the first DMRS or the second DMRS may include adjusting a position of the at least one DMRS symbol of the first DMRS.

[0092] In some implementations, modifying at least one DMRS symbol of the first DMRS or the second DMRS may include: incrementing the position value of each DMRS symbol of the first DMRS of the first transmission by 1; and incrementing the position value of each DMRS symbol of the second DMRS of the second transmission by 1.

[0093] In some implementations, the first resources of the first transmission at least partially overlap with the second resources of the second transmission in the time domain, the frequency domain, or both.

[0094] In some implementations, the first resources of the first transmission are orthogonal to the second resources of the second transmission in the time domain, the frequency domain, or both.

[0095] In some implementations, first resources of a first transmission do not overlap with second resources of a second transmission in the time domain, the frequency domain, or both.

[0096] In some implementations, the first message corresponds to the CORESET group, the second message corresponds to a second CORESET group, and the CORESET groups are indicated by higher-level signaling.

[0097] Details of one or more implementations of the subject matter described in the present disclosure are set forth in the accompanying drawings and the following description. Other features, aspects, and advantages will become apparent from the description, drawings, and claims. It should be noted that the relative sizes of the following drawings may not be drawn to scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] Figure 1 is a block diagram illustrating details of an example wireless communication system.

[0100] Figure 2 is a block diagram conceptually illustrating an example design of an example base station and user equipment (UE).

[0101] Figure 3 is a diagram illustrating an example of a wireless communication system operating in a multiple transmission / reception point (TRP) scheme.

[0102] Figure 4 is a block diagram illustrating examples of process flows for different multi-TRP schemes.

[0103] Figures 5A-5D are diagrams illustrating different example multi-TRP schemes.

[0104] Figure 6 is a block diagram illustrating an example of a wireless communication system implementing DMRS modification.

[0105] Figures 7A-7C is a block diagram illustrating an example of DMRS modification for a single PDSCH.

[0106] Figures 8A-8C is a block diagram illustrating an example of DMRS modification for multiple PDSCHs.

[0107] Fig. 9 is a block diagram illustrating example blocks executed by a UE.

[0108] Fig.10 is a block diagram illustrating example blocks executed by network entities.

[0109] Fig.11 is a block diagram conceptually illustrating an example design of a UE.

[0110] Fig.12 is a block diagram conceptually illustrating an example design of network entities.

[0111] Like reference numbers and designations in the various drawings indicate like elements.

[0112] Detailed Description

[0113] The following description is directed to certain implementations in order to describe the innovative aspects of the present disclosure. However, one of ordinary skill in the art will readily appreciate that the teachings herein can be applied in many different ways.

[0114] Wireless communication systems operated by different network entities may share spectrum. In some instances, two network entities may be configured to send transmissions to multiple user equipments (UEs). Thus, in order to enable network entities to make more use of the shared spectrum, and to mitigate interfering communications between different network entities, certain resources may be shifted to avoid conflicts and interference in an effort to achieve successful reception and decoding.

[0115] For example, when the network entity and the UE are operating in a single transmission reception point (TRP) mode, there are some situations where the demodulation reference signal (DMRS) is shifted to avoid conflicts with the cell-specific reference signal (CRS) pattern or with the reserved resources of the control resource set (CORESET). In other words, the position of the DMRS symbol may be shifted due to conflicts with other resources.

[0116] However, when operating in multiple TRP modes, conventional networks and devices cannot perform DMRS shifts. For example, when two transmissions overlap at least partially, if the DMRS position of one of these transmissions is shifted due to a conflict of the corresponding CRS pattern, the alignment of these transmissions may be changed. If the DMRS symbols of the overlapping transmissions are not aligned, these DMRS symbols may interfere, or the UE may not be able to receive and decode one or more of these transmissions due to poor channel estimation performance. On the other hand, if the DMRS symbols of the overlapping transmissions are aligned, and the DMRS ports of the overlapping transmissions are separated and belong to different code division multiplexing (CDM) groups, the actual DMRS resource elements (REs) become orthogonal in the frequency domain, which enhances the channel estimation performance. Thus, the implementation described herein can implement a procedure for performing DMRS shifts in multiple TRP modes. Such shifts can enable the DMRS positions of the two transmissions to be aligned to enable the UE to receive and decode these transmissions. For example, the DMRS symbols of the two transmissions may be shifted in response to determining the overlap of one of these transmissions. Thus, the two transmissions can be DMRS shifted and remain aligned with each other. Specific implementations of the subject matter described in the present disclosure can be implemented to achieve one or more of the following potential advantages. For example, by enabling DMRS shifting for multiple TRP modes, the network can send overlapping transmissions to increase bandwidth and reduce latency. Additionally, the network may be able to operate in a multi-TRP mode to achieve carrier aggregation or dual connectivity (such as by using a multi-signaling multi-TRP mode).

[0117] The present disclosure generally relates to providing or participating in authorized shared access between two or more wireless communication systems (also referred to as wireless communication networks). In various implementations, various techniques and devices (equipment) may be used for wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, fifth generation (5G) or new radio (NR) networks (sometimes referred to as "5G NR" networks / systems / equipment), and other communication networks. As described herein, the terms "network" and "system" may be used interchangeably.

[0118] A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband-CDMA (W-CDMA) and Low Chip Rate (LCR). CDMA2000 covers IS-2000, IS-95 and IS-856 standards.

[0119] TDMA networks can implement radio technologies such as Global System for Mobile Communications (GSM). 3GPP defines standards for GSM EDGE (Enhanced Data Rates for GSM Evolution) Radio Access Network (RAN) (also referred to as GERAN). GERAN is the radio component of the network that GSM / EDGE together with base stations (e.g., Ater and Abis interfaces) and base station controllers (A interfaces, etc.) join. The radio access network represents the component of the GSM network through which telephone calls and packet data are routed from the Public Switched Telephone Network (PSTN) and the Internet to subscriber handsets (also known as user terminals or user equipment (UE)) and from subscriber handsets to the PSTN and the Internet. The network of a mobile phone operator may include one or more GERANs, which may be coupled with UTRAN in the case of a UMTS / GSM network. Additionally, the operator network may include one or more LTE networks, or one or more other networks. Various network types may use different radio access technologies (RATs) and radio access networks (RANs).

[0120] OFDMA network can realize radio technologies such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE802.16, IEEE802.20, flash-OFDM, etc. UTRA, E-UTRA and GSM are part of Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS using E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided by an organization named "3rd Generation Partnership Project" (3GPP), while cdma2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or under development. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between various telecommunications association groups that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP Long Term Evolution (LTE) is a 3GPP project aimed at improving the Universal Mobile Telecommunications System (UMTS) mobile phone standard. 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure may describe certain aspects with reference to LTE, 4G, 5G, or NR technology; however, the description is not intended to be limited to a particular technology or application, and one or more aspects described with reference to one technology may be understood to be applicable to another technology. In fact, one or more aspects of the present disclosure relate to shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces.

[0121] 5G networks envision a variety of deployments, spectrum, and services and devices that can be implemented using a unified OFDM-based air interface. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also being considered. 5G NR will be able to scale to provide coverage for: (1) Ultra-high density (such as about 1M nodes / km) 2 ), ultra-low complexity (such as about tens of bits / second), ultra-low energy (such as about 10+ years of battery life), and deep coverage capable of reaching challenging locations; (2) including mission-critical control with strong security (to protect sensitive personal, financial, or confidential information), ultra-high reliability (such as about 99.9999% reliability), ultra-low latency (such as about 1 millisecond (ms)), and users with a wide range of mobility or lack of mobility; and (3) with enhanced mobile broadband, including extremely high capacity (such as about 10Tbps / km 2 ), extreme data rates (such as multi-Gbps rates, 100+Mbps user experience rates), and deep cognition with advanced discovery and optimization.

[0122] 5G NR devices, networks, and systems can be implemented to use optimized OFDM-based waveform features. These features may include: scalable parameter sets and transmission time intervals (TTIs); a common, flexible framework to efficiently multiplex services and features using dynamic low-latency time time division duplex (TDD) / frequency division duplex (FDD) designs; and advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel coding, and device-centric mobility. The scalability of parameter sets in 5G NR (and the scaling of subcarrier spacing) can efficiently solve the problem of operating diverse services across diverse spectrums and diverse deployments. For example, in various outdoor and macro coverage deployments less than 3GHz FDD / TDD implementations, the subcarrier spacing can occur, for example, at 15kHz on bandwidths such as 1, 5, 10, 20MHz. For other various outdoor and small cell coverage deployments of TDD greater than 3GHz, the subcarrier spacing can occur at 30kHz on 80 / 100MHz bandwidths. For various other indoor broadband implementations, subcarrier spacing can occur at 60kHz over a 160MHz bandwidth using TDD on the unlicensed portion of the 5GHz band. Finally, for various deployments transmitting with the mmWave component at 28GHz TDD, subcarrier spacing can occur at 120kHz over a 500MHz bandwidth.

[0123] 5G NR's scalable parameter set facilitates scalable TTI to meet various latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long TTIs and short TTIs allows transmissions to start on symbol boundaries. 5G NR also contemplates a self-contained integrated subframe design with uplink / downlink scheduling information, data, and acknowledgment in the same subframe. Self-contained integrated subframes support communications in unlicensed or contention-based shared spectrum, supporting adaptive uplink / downlink that can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current traffic needs.

[0124] For clarity, certain aspects of the devices and techniques may be described below with reference to example 5G NR implementations or in a 5G-centric manner, and 5G terminology may be used in parts of the following description as an illustrative example; however, the description is not intended to be limited to 5G applications.

[0125] Furthermore, it should be understood that in operation, a wireless communication network adapted according to the concepts herein may operate with any combination of licensed or unlicensed spectrum depending on load and availability. Accordingly, it will be apparent to one of ordinary skill in the art that the systems, devices, and methods described herein may be applied to other communication systems and applications other than the specific examples provided.

[0126] Figure 1 1 is a block diagram illustrating details of an example wireless communication system. The wireless communication system may include a wireless network 100. For example, the wireless network 100 may include a 5G wireless network. As appreciated by those skilled in the art, Figure 1 The components appearing in are likely to have related counterparts in other network arrangements (including, for example, cellular network arrangements and non-cellular network arrangements, such as device-to-device or peer-to-peer or ad hoc network arrangements, etc.).

[0127] Figure 1 The wireless network 100 illustrated in the figure includes several base stations 105 and other network entities. The base station can be a station that communicates with the UE, and can be referred to as an evolved B node (eNB), a next generation eNB (gNB), an access point, etc. Each base station 105 can provide communication coverage for a specific geographical area. In 3GPP, the term "cell" can refer to such a specific geographical coverage area of ​​a base station or a base station subsystem that serves the coverage area, depending on the context in which the term is used. In the implementation of the wireless network 100 herein, the base station 105 can be associated with the same operator or different operators, such as the wireless network 100 can include multiple operator wireless networks. Additionally, in the implementation of the wireless network 100 herein, the base station 105 can use one or more frequencies (such as a licensed spectrum, an unlicensed spectrum, or one or more frequency bands in a combination thereof) in the same frequency as the adjacent cell to provide wireless communication. In some examples, an individual base station 105 or UE 115 can be operated by more than one network operating entity. In some other examples, each base station 105 and UE 115 can be operated by a single network operating entity.

[0128] A base station may provide communication coverage for a macro cell or a small cell (such as a pico cell or a femto cell), or other types of cells. A macro cell generally covers a relatively large geographic area (such as a radius of several kilometers) and may allow unrestricted access by UEs that have a service subscription with a network provider. A small cell (such as a pico cell) generally covers a relatively small geographic area and may allow unrestricted access by UEs that have a service subscription with a network provider. A small cell (such as a femto cell) generally also covers a relatively small geographic area (such as a residence) and, in addition to unrestricted access, may also provide restricted access to UEs associated with the femto cell (such as UEs in a closed subscriber group (CSG), UEs of users in the residence, and so on). The base station of a macro cell may be referred to as a macro base station. The base station of a small cell may be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In Figure 1 In the example shown in FIG. 1 , base stations 105d and 105e are conventional macro base stations, while base stations 105a-105c are macro base stations with one of 3-dimensional (3D), full-dimensional (FD), or massive MIMO enabled. Base stations 105a-105c utilize their higher dimensional MIMO capabilities to increase coverage and capacity using 3D beamforming in both elevation and azimuth beamforming. Base station 105f is a small cell base station, which may be a home node or a portable access point. The base station may support one or more cells, such as two cells, three cells, four cells, and so on.

[0129] The wireless network 100 may support synchronous or asynchronous operation. For synchronous operation, each base station may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, each base station may have different frame timing, and transmissions from different base stations may not be aligned in time. In some scenarios, the network may be implemented or configured to handle dynamic switching between synchronous or asynchronous operation.

[0130] UE 115 is dispersed throughout the wireless network 100, and each UE can be stationary or mobile. It should be appreciated that although mobile devices are generally referred to as user equipment (UE) in the standards and specifications promulgated by the 3rd Generation Partnership Project (3GPP), such devices may be additionally or additionally referred to as mobile stations (MS), subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals (AT), mobile terminals, wireless terminals, remote terminals, handsets, terminals, user agents, mobile clients, clients, or some other suitable terminology by those skilled in the art. Within this document, a "mobile" device or UE does not necessarily have mobile capabilities and can be stationary. Some non-limiting examples of mobile devices such as may include implementations of one or more of each UE 115, including mobile stations, cellular phones (mobile phones), smart phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, laptops, personal computers (PCs), notebooks, netbooks, smart books, tablets, and personal digital assistants (PDAs). The mobile device may additionally be an "Internet of Things" (IoT) or "Internet of Everything" (IoE) device, such as a car or other transportation vehicle, a satellite radio, a global positioning system (GPS) device, a logistics controller, a drone, a multicopter, a quadcopter, a smart energy or security device, a solar panel or solar array, city lighting, water or other infrastructure; industrial automation and enterprise devices; consumer and wearable devices, such as glasses, wearable cameras, smart watches, health or fitness trackers, mammal implantable devices, gesture tracking devices, medical devices, digital audio players (such as MP3 players), cameras, game consoles, etc.; and digital home or smart home devices, such as home audio, video and multimedia devices, appliances, sensors, vending machines, smart lighting, home security systems, smart meters, etc. In one aspect, a UE may be a device including a universal integrated circuit card (UICC). In another aspect, a UE may be a device that does not include a UICC. In some aspects, a UE that does not include a UICC may be referred to as an IoE device. Figure 1 The UEs 115a-115d of the implementation illustrated in FIG are examples of mobile smartphone-type devices accessing the wireless network 100. A UE may be a machine specifically configured for connected communications, including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc. Figure 1 The UEs 115e-115k illustrated in FIG. 1 are examples of various machines configured for communication for accessing the 5G network 100.

[0131] A mobile device, such as UE 115, may be able to communicate with any type of base station, whether macro, pico, femto, relay, etc. Figure 1 In the figure, the communication link (represented as a lightning bolt) indicates the wireless transmission between the UE and the serving base station (the serving base station is the base station designated to serve the UE on the downlink or uplink), or the expected transmission between the base stations, and the backhaul transmission between the base stations. The backhaul communication between the base stations of the wireless network 100 can occur using wired and / or wireless communication links.

[0132] In operation of the 5G network 100, base stations 105a-105c use 3D beamforming and coordinated spatial techniques such as coordinated multipoint (CoMP) or multi-connectivity to serve UEs 115a and 115b. Macro base station 105d performs backhaul communications with base stations 105a-105c and small cell base station 105f. Macro base station 105d also transmits multicast services subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information such as weather emergencies or alerts, such as Amber Alerts or Gray Alerts.

[0133] The wireless network 100 of each implementation supports mission-critical communications with ultra-reliable and redundant links for mission-critical devices, such as UE 115e, which is a drone. The redundant communication links with UE 115e include from macro base stations 105d and 105e, and small cell base station 105f. Other machine-type devices, such as UE 115f (thermometer), UE 115g (smart meter), and UE 115h (wearable device), can communicate directly with base stations, such as small cell base station 105f and macro base station 105e, through the wireless network 100, or communicate through the wireless network 100 in a multi-hop configuration by communicating with another user equipment that relays its information to the network (such as UE 115f communicating temperature measurement information to smart meter UE 115g, which is reported to the network through small cell base station 105f). The 5G network 100 may provide additional network efficiency through dynamic, low latency TDD / FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i - 115k communicating with a macro base station 105e .

[0134] Figure 2 1 is a block diagram conceptually illustrating an example design of a base station 105 and a UE 115. The base station 105 and the UE 115 may be Figure 1 For a restricted association scenario (as mentioned above), the base station 105 may be Figure 1105f, and UE 115 may be UE 115c or 115d operating in the service area of ​​​​the base station 105f. In order to access the small cell base station 105f, the UE 115 will be included in the accessible UE list of the small cell base station 105f. In addition, the base station 105 may be some other type of base station. Figure 2 As shown in FIG. 1 , the base station 105 may be equipped with antennas 234a through 234t, and the UE 115 may be equipped with antennas 252a through 252r, for facilitating wireless communication.

[0135] At the base station 105, the transmit processor 220 may receive data from the data source 212 and control information from the controller / processor 240. The control information may be used for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ (automatic repeat request) indicator channel (PHICH), a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (ePDCCH), an MTC physical downlink control channel (MPDCCH), etc. Data may be used for a PDSCH, etc. The transmit processor 220 may process (such as encode and symbol map) the data and the control information to obtain data symbols and control symbols, respectively. Additionally, the transmit processor 220 may generate reference symbols, such as reference symbols for a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and a reference signal that is specific to a cell. The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing on data symbols, control symbols, or reference symbols where applicable, and may provide an output symbol stream to modulators (MODs) 232a to 232t. For example, the spatial processing performed on data symbols, control symbols, or reference symbols may include precoding. Each modulator 232 may process a respective output symbol stream (such as for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may additionally or alternatively process the output sample stream to obtain a downlink signal. For example, to process the output sample stream, each modulator 232 may convert to analog, amplify, filter, and up-convert the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a to 232t may be transmitted via antennas 234a to 234t, respectively.

[0136] At the UE 115, antennas 252a to 252r may receive downlink signals from the base station 105 and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition the respective received signals to obtain input samples. For example, to condition the respective received signals, each demodulator 254 may filter, amplify, downconvert, and digitize the respective received signals to obtain input samples. Each demodulator 254 may further process the input samples (such as for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process the detected symbols, provide decoded data for the UE 115 to a data sink 260, and provide decoded control information to a controller / processor 280. For example, to process the detected symbols, the receive processor 258 may demodulate, deinterleave, and decode the detected symbols.

[0137] On the uplink, at the UE 115, the transmit processor 264 may receive and process data from a data source 262, such as data for a physical uplink shared channel (PUSCH), and control information from a controller / processor 280, such as control information for a physical uplink control channel (PUCCH). Additionally, the transmit processor 264 may generate reference symbols for reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r, such as for SC-FDM, etc., and transmitted to the base station 105. At the base station 105, the uplink signal from the UE 115 may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 115. Receive processor 238 may provide decoded data to data sink 239 and decoded control information to controller / processor 240 .

[0138] The controllers / processors 240 and 280 may direct the operation at the base station 105 and the UE 115, respectively. The controller / processor 240 or other processors and modules at the base station 105 or the controller / processor 280 or other processors and modules at the UE 115 may perform or direct the execution of various processes for the techniques described herein, such as performing or directing Fig. 9 and Fig.10, or other processes for the techniques described herein. Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink or uplink.

[0139] In some cases, the UE 115 and the base station 105 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (such as based on contention) spectrum. In the unlicensed frequency portion of the shared radio frequency spectrum band, the UE 115 or the base station 105 may traditionally perform a medium sensing procedure to contend for access to the spectrum. For example, the UE 115 or the base station 105 may perform a listen-before-talk or listen-before-transmit (LBT) procedure (such as a clear channel assessment (CCA)) before communicating to determine whether the shared channel is available. CCA may include an energy detection procedure to determine whether there are any other active transmissions. For example, a device may infer that a change in the received signal strength indicator (RSSI) of a power meter indicates that the channel is occupied. Specifically, a signal power concentrated in a specific bandwidth and exceeding a predetermined noise floor may indicate another wireless transmitter. In some implementations, CCA may include detection of a specific sequence indicating channel use. For example, another device may transmit a specific preamble before transmitting a data sequence. In some cases, the LBT procedure may include the wireless node acting as a proxy for collisions to adjust its own backoff window based on the amount of energy detected on the channel or acknowledgment / negative acknowledgment (ACK / NACK) feedback for its own transmitted packets.

[0140] Using medium sensing procedures to contend for access to unlicensed shared spectrum may result in communication inefficiencies. This may be particularly evident when multiple network operating entities (such as network operators) are trying to access shared resources. In the 5G network 100, the base station 105 and the UE 115 may be operated by the same or different network operating entities. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity. Requiring each base station 105 and UE 115 of a different network operating entity to contend for shared resources may result in increased signaling overhead and communication latency.

[0141] Figure 3An example of a wireless communication system 300 that supports different multi-TRP schemes is illustrated. In some examples, the wireless communication system 300 can implement aspects of the wireless communication system 100. For example, the wireless communication system 300 can include multiple UEs 115 and base stations 105. The base stations 105 can use TRPs 305 to communicate with the UEs 115. Each base station 105 can have one or more TRPs 305. For example, the base station 105-a can include TRPs 305-a and TRPs 305-b, and the base station 105-b can include TRPs 305-c. UE 115-a may communicate with the network using a single TRP 305, multiple TRPs 305 corresponding to a single base station 105 (such as TRPs 305-a and 305-b at base station 105-a), or multiple TRPs 305 corresponding to multiple different base stations 105 (such as TRP 305-a at base station 105-a and TRP 305-c at base station 105-b, where base stations 105-a and 105-b may be connected via a backhaul connection).

[0142] In a communication scheme including multiple TRPs 305, a single DCI message can configure communications for multiple TRPs 305. In an example, a base station 105-a can use a first TRP 305-a and a second TRP 305-b to communicate. The base station 105-a can use TRP 305-a to transmit DCI to UE 115-a on PDCCH 310-a. DCI may include communication configuration information about (all) TCI states. The (all) TCI states may determine whether the communication corresponds to a single TRP communication or to multiple TRP communications. The (all) TCI states may also indicate the type of communication scheme (such as TDM, FDM, SDM, etc.) configured for communication. If the TCI configuration is a TCI state, the one TCI state may correspond to a single TRP communication. If the TCI configuration is a plurality of TCI states, the plurality of TCI states may correspond to communications with a plurality of TRPs. In some cases, the wireless communication system 300 may support up to M candidate TCI states for the purpose of quasi co-location (QCL) indication. Of these M candidates (such as 128 candidate TCI states), a subset of TCI states may be determined based on a medium access control (MAC) control element (CE). The MAC-CE may correspond to a specific number (such as 2) of TCI states for PDSCH QCL indication. N N bits may be used in a message (such as a DCI) to dynamically indicate these 2 (such as 8 TCI states) candidate TCI states. N One of the TCI states.

[0143] The DCI on PDCCH 310-a may schedule a PDSCH 315-a transmission from TRP 305-a for a single TRP communication configuration. Alternatively, the DCI on PDCCH 310-a may schedule multiple PDSCH 315 transmissions from multiple TRPs 305. For example, the DCI may schedule a PDSCH 315-a transmission from TRP 305-a and a PDSCH 315-b transmission from TRP 305-b, or a PDSCH 315-a transmission from TRP 305-a and a PDSCH 315-c transmission from TRP 305-c for a multi-TRP communication configuration. UE115 may be configured with a list of different candidate TCI states for the purpose of QCL indication. Each TCI code point in the DCI may correspond to one or more TCI states (such as corresponding to one or more reference signal (RS) sets used to indicate a QCL relationship).

[0144] In the case where the network utilizes TRP 305 to communicate with UE 115, whether in a single TRP configuration or in a multi-TRP configuration, there may be a variety of different schemes for communicating with (all) TRP 305. The TRP communication scheme may be determined by the TCI state. The (all) TCI states used for communicating on PDSCH 315 may be indicated by one or more bits in the DCI, wherein the one or more bits indicate a TCI code point. The TCI code point in the DCI may correspond to one or more TCI states (such as one TCI state or two TCI states). If the TCI code point in the DCI indicates one TCI state, UE 115 is configured for single TRP operation. If the TCI code point in the DCI indicates two TCI states (and, accordingly, indicates two QCL relationships), UE 115 is configured for multi-TRP operation. For example, if two TCI states are indicated in the TCI code point, each TCI state may correspond to a DMRS code division multiplexing (CDM) group.

[0145] In a first example multi-TRP scheme, the TRP 305 may communicate by utilizing SDM. In this case, different spatial layers may be transmitted from different TRPs 305 on the same RB and symbol. Each TCI state may also correspond to a different DMRS port group. The DMRS ports in a DMRS CDM port group may be quasi co-located (QCL). This may allow the UE 115 to estimate each channel individually. In SDM, each antenna port used on the downlink may belong to a different CDM group. The base station 105-a may use the antenna port field in the DCI to indicate the antenna port group.

[0146] The SDM scheme may include different TCI states within a single time slot, where these TCI states overlap in time, frequency, or both. Different spatial layer groups (which may correspond to different TCI states) may use the same modulation order. The use of the same modulation order by multiple groups may be signaled by a modulation and coding scheme (MCS). In some cases, the base station 105-a may indicate the MCS in the DCI. In the case where different spatial layer groups use different modulation orders, each of these different modulation orders may be signaled to the UE 115-a. Different DMRS port groups may correspond to different TRPs, QCL relationships, TCI states, or a combination thereof.

[0147] In other examples of multi-TRP schemes, the TRP 305 may communicate with the UE 115-a by utilizing an FDM or TDM communication scheme. In the FDM scheme, one RB set or PRG set may correspond to a first TRP 305-a and a first TCI state, and a second RB set or PRG set may correspond to a second TRP 305-b and a second TCI state. The RBs allocated for each TRP may be different from each other so that each TRP communicates on a designated RB set that is different from another RB set (but may overlap in the same OFDM symbol). The frequency domain resource assignment field in the DCI may indicate both the first RB or PRG set and the second RB or PRG set. In some cases, the base station 105-a may use additional signaling in the DCI to indicate which RBs belong to the first set and which RBs belong to the second set. In some cases, the system may support a limited number of possibilities for allocating frequency resources to different TRPs (such as to reduce overhead).

[0148] In a TDM scheme, a similar probability table can be used to signal resource allocations for different TRPs. In this case, each TRP is assigned to a different set of OFDM symbols rather than a different set of RBs. Such a TDM scheme can support TDM transmissions within a single time slot, such as a transmission time interval (TTI). In some cases, the TDM scheme can implement time slot aggregation, where transmissions using different TCI states can be spread across different time slots, such as TTIs. In time slot aggregation, transmissions on different TRPs can use separate rate matching, but can have the same or different modulation orders.

[0149] The network may communicate with UE 115-a using multiple TRPs and any of the communication schemes described herein. In addition, some communication schemes may include a combination of TDM and FDM, or scenarios where TDM may or may not be in a slot aggregation configuration. These schemes may also include some scenarios where rate matching is joint and some scenarios where rate matching is separate for different TRPs, and these schemes may also include scenarios where different TRPs have the same or different modulation orders. Each scheme may also utilize different parameters included in the signaling, such as which DMRS ports are used (such as for an SDM scheme) or how the RBs are split (such as for an FDM scheme).

[0150] In order to efficiently configure UE 115-a with TCI state information - and the corresponding TRP scheme - base station 105-a can generate bits for DCI messages and can transmit the DCI on PDCCH 310-a. The DCI message can be transmitted to UE 115-a using TRP305-a. UE 115-a can determine which scheme is configured for communication with TRP 305 based on one or more fields of the received DCI. The DCI can be the same size across all communication schemes, and the formatting of the DCI fields (such as the number of bits) can remain the same across these communication schemes.

[0151] Figure 4 is a block diagram illustrating examples of process flows for different multi-TRP schemes. Figure 4 An example of a process flow 400 that supports different multi-TRP schemes is illustrated. In some examples, the process flow 400 may implement various aspects of the wireless communication system 100 or 300. For example, a base station 105 and a UE 115 (such as a base station 105-c and a UE 115-b) may perform one or more of the processes described with reference to the process flow 400. The base station 105-c may communicate with the UE 115-b by transmitting and receiving signals via TRPs 405-a and 405-b. In other cases, TRPs 405-a and 405-b may correspond to different base stations 105. The following alternative examples may be implemented, in which some of the steps are performed in a different order than described or not performed at all. In some cases, each step may include additional features not mentioned below, or further steps may be added.

[0152] At 410, base station 105-c may generate DCI. The generating may include generating a first set of bits (such as a TCI field) that may indicate a set of TCI states for communicating with UE 115-b. The generating may also include generating a second set of bits (such as an antenna port field) that may indicate a set of antenna ports and (in some cases) a multi-TRP communication scheme for multi-TRP communication operations. In some cases, the second set of bits may additionally indicate a modulation order for at least one TCI state (such as a second TCI state for TRP 405-b), an RV for a TB for at least one TCI state (such as a second TCI state for TRP 405-b), or a combination thereof.

[0153] At 415, base station 105-c may transmit the generated DCI to UE 115-b. UE 115-b may receive the DCI from base station 105-c. The DCI may be transmitted from TRP 405-a on the PDCCH. The DCI may schedule an upcoming PDSCH transmission and may include other control information. The DCI may include an indication of the first bit set and the second bit set. For example, the DCI may include coded bits based on the first bit set and the second bit set.

[0154] At 420, the UE 115-b may read a TCI field (such as a first set of bits) received in the DCI message. The UE 115-b may use the first set of bits to identify one or more TCI states for communicating with the base station 105-c using one or more TRPs 405.

[0155] At 425, UE 115-b may determine the TCI state configuration based on reading the TCI field of the DCI. For example, the value in the TCI field (such as tci-PresentInDCI) may not be configured as a CORESET for scheduling PDSCH, or the value may correspond to one TCI state. In these cases, the communication scheme may be configured for one TRP. In other cases, the TCI field value may correspond to more than one TCI state. In these other cases, the communication may be configured for communication with multiple TRPs.

[0156] UE 115-b may read the antenna port field of the DCI and may interpret the value of the field based on the determined TCI state configuration. For example, if UE 115-b determines that the TCI field indicates a single TCI state, UE 115-b may use a second set of bits to identify a set of antenna ports for PDSCH transmission. At 430, UE 115-b may access a table (such as pre-configured in a memory or configured by the network) to determine one or more antenna ports corresponding to the antenna port field value.

[0157] Alternatively, if UE 115-b determines that the TCI field indicates multiple TCI states, UE 115-b may use a second bit set to identify the antenna port set and the multi-TRP communication scheme based on identifying the TCI state set. The second bit set may include the same number of bits regardless of whether the field indicates only the antenna port set for single TRP operation or the antenna port set and the multi-TRP scheme for multi-TRP operation. At 430, UE 115-b may access a lookup table to determine the antenna port set and the multi-TRP scheme based on the antenna port field value. In some cases, UE 115-b may select a lookup table from a set of lookup tables, wherein the set may include one lookup table to be used for TRP operation and one lookup table to be used for multi-TRP operation.

[0158] The lookup table may include information that maps both the antenna port set and the multi-TRP scheme to a second bit set. In some cases, the lookup table that maps both the antenna port set and the multi-TRP communication scheme to the second bit set may be pre-configured in a memory, and in some cases, it may be dynamically configured by the base station 105-c. The UE 115-b may identify the second antenna port set and the multi-TRP scheme based on the selected lookup table. In the lookup table for multi-TRP operation, the table may include an indication of a multi-TRP scheme (such as SDM, FDM, TDM, or some combination thereof) together with an indication of a DMRS port. The antenna port field lookup table may indicate that the value in the antenna port field of the DCI corresponds to a DMRS port set, wherein the DMRS port set further corresponds to a communication scheme, such as SDM or FDM. The antenna port field value may also indicate whether the rate matching is joint or separate. If the antenna port field value indicates that the FDM communication scheme is used, the table may additionally indicate the RB configuration for the TCI state via FDM, as shown in the "Possibility" column of the following table. If the lookup table is configurable by the network, the network may use Radio Resource Control (RRC) signaling to define the possible DMRS port sets and scheme types.

[0159] In some cases, UE 115-b may use a second bit set to identify a modulation order for at least one TCI state in a set of possible TCI states. Different modulation orders may also be used across different TCI states. A first modulation order may be indicated in the modulation order field. In multi-TRP operation, the first modulation order may correspond to a first TCI state. A second modulation order may be indicated in one of the above tables based on a received antenna port field value. For example, a column in the antenna port field lookup table may indicate whether the modulation order corresponding to the second TCI state is the same as the modulation order indicated in the MCS (i.e., the modulation order for the first TCI state). If the modulation order is not the same as the modulation order indicated in the MCS, the value of the modulation order for the second TCI state may be indicated in the antenna port field. The value of the modulation order may be an absolute value, or may be a relative value relative to the first modulation order.

[0160] If the TCI state configuration is determined to indicate communication with a single TRP, the UE 115-b may receive a transmission from one TRP 405-a at 435. The UE 115-b may communicate with the single TRP 405-a based on the determined communication scheme.

[0161] If the TCI state configuration is determined to indicate communication with multiple TRPs 405, the UE 115-b may receive a transmission from one TRP 405-a at 435 and may also receive a transmission from another TRP 405-b at 440 (wherein, in some cases, 435 and 440 may correspond to the same time or OFDM symbol). The UE 115-b may communicate with the network via the multiple configured TRPs 405 based on the determined communication scheme.

[0162] The systems and methods described herein relate to DMRS modifications for multi-message transmission and reception and multi-TRP modes. These DMRS modifications can achieve enhanced or improved operations in multi-TRP modes. In some implementations, the systems and methods described herein enable DMRS shifting in multi-TRP modes based on multi-DCI. Accordingly, such systems and methods can be used in multi-TRP modes.

[0163] Figures 5A-5D is a diagram illustrating different example multi-TRP schemes. Figures 5A-5D , illustrates examples of diagrams for different example TRP modes. Figure 5A , a diagram illustrating carrier aggregation is illustrated. Figure 5A A base station 105a is depicted in communication with a UE 115a. The base station 105a may transmit data and control information; the base station 105 may use different equipment or settings (such as different frequencies) to transmit (and receive) information. Figure 5B, a diagram illustrating dual connectivity is illustrated. Figure 5B Two base stations 105a and 105b are depicted in communication with a UE 115a. The UE 115a communicates data with both base stations and controls information with one base station, the primary base station 105a.

[0164] Figure 5C and Figure 5D DCI-based operations for multi-TRP mode are described. Figure 5C describes the single DCI mode of operation, and Figure 5D Describes the multiple DCI modes of operation. Figure 5C and Figure 5D In the embodiment, the system includes a first TRP 505a, a second TRP 505b, and a UE 515. The second TRP 505b may be included with the first TRP 505a (such as Figure 5A The two TRPs of the first base station 105a may be separated from the first TRP 505a (such as Figure 5B The TRP from each of the first and second base stations 105a and 105b). Figure 5C In the first TRP 505a, downlink control information or DCI is transmitted, as illustrated by the first PDCCH 512. Figure 5C In the example, the first PDCCH 512 schedules two PDSCHs—a first PDSCH 522 and a second PDSCH 524 .

[0165] On the contrary, Figure 5D , both the first TRP 505a and the second TRP 505b transmit DCI, as illustrated by PDCCH 512 and 514. Each PDCCH 512 and 514 schedules a corresponding PDSCH - PDSCH 522, 524. These PDSCH resources may overlap, partially overlap, or not overlap. For PDCCH 512 and 515, different CORESETs or CORESET groups may be used for the two TRPs 505a and 505b (i.e., the first CORESET group is used for the first transmission for the first TRP 505a, and the second CORESET group is used for the second transmission for the second TRP 505b). Each CORESET or CORESET group may have a different TCI state.

[0166] The CORESET group may or may not be indicated to the UE. For example, when signaled to the UE, the CORESET group may be indicated by higher layer signaling. The CORESET group information may be used for DMRS modification, CRS rate matching, or both. As another example, when not signaled, the UE may not be aware of the CORESET group and may not utilize the CORESET group data for DMRS modification, CRS rate matching, or both.

[0167] Figure 6 is a block diagram illustrating an example of a wireless communication system implementing DMRS modification. Figure 6 An example of a wireless communication system 600 that supports DMRS modification is illustrated. In some examples, the wireless communication system 600 may implement aspects of the wireless communication system 100. For example, the wireless communication system 600 may include a network entity 605 (such as a base station 105), a UE 115, and may optionally include a second network entity 607 (such as a second base station 105, or a second TRP of the base station 105). DMRS modification operations can implement multi-TRP operations based on multiple DCIs and operations with other types of networks (such as LTE). Operating on multiple networks and bandwidths can achieve increased throughput and reliability as well as reduced latency.

[0168] The network entity 605 and the UE 115 may be configured to communicate via a frequency band, such as FR1 for millimeter wave, which has a frequency of 410 to 7125 MHz, or FR2, which has a frequency of 24250 to 52600 MHz. It should be noted that for certain data channels, the subcarrier spacing (SCS) may be equal to 15, 30, 60, or 120 kHz. The network entity 605 and the UE 115 may be configured to communicate via one or more component carriers (CCs), such as a representative first CC 681, a second CC 682, a third CC 683, and a fourth CC 684. Although four CCs are shown, this is for illustration only, as more or less than four CCs may be used. One or more CCs may be used to convey a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), or a physical uplink shared channel (PUSCH). In some implementations, such transmissions may be scheduled by dynamic grants. In some other implementations, such transmissions may be scheduled by one or more periodic grants, and may correspond to a semi-persistently scheduled (SPS) grant or a configured grant in the one or more periodic grants.

[0169] Each periodic grant may have a corresponding configuration, such as configuration parameters / settings. The periodic grant configuration may include SPS configuration and settings. Additionally or alternatively, one or more periodic grants (such as their SPS grants) may have or be assigned to a CC ID, such as an expected CC ID.

[0170] Each CC may have a corresponding configuration, such as configuration parameters / settings. The configuration may include bandwidth, bandwidth part, hybrid automatic repeat request (HARQ) process, TCI state, RS, control channel resources, data channel resources, or a combination thereof. Additionally or alternatively, one or more CCs may have or be assigned a cell ID, a bandwidth part (BWP) ID, or both. The cell ID may include a unique cell ID of the CC, a virtual cell ID, or a specific cell ID of a specific CC in the multiple CCs. Additionally or alternatively, one or more CCs may have or be assigned a HARQ ID. Each CC may also have corresponding management functionality, such as beam management, BWP switching functionality, or both. In some implementations, two or more CCs are quasi-co-located so that the CCs have the same beam or the same codeword.

[0171] In some implementations, the control information may be communicated via the network entity 605 and the UE 115. For example, the control information may be communicated using a MAC-CE transmission, an RRC transmission, a DCI transmission, another transmission, or a combination thereof.

[0172] UE 115 includes a processor 602, a memory 604, a transmitter 610, a receiver 612, an encoder 613, a decoder 614, a DMRS modifier 615, a CRS rate matcher 616, and antennas 252a-r. Processor 602 may be configured to execute instructions stored in memory 604 to perform operations described herein. In some implementations, processor 602 includes or corresponds to controller / processor 280, and memory 604 includes or corresponds to memory 282. Memory 604 may also be configured to store DMRS data 606, CRS data 608, CORESET group data 642, modification parameter data 644, or a combination thereof, as further described herein.

[0173] DMRS data 606 corresponds to DMRS data of or associated with: network entity 605, second network entity 607, or both. For illustration, DMRS data 606 may include DMRS symbols for transmission (such as PDSCH transmission) and the position of these DMRS symbols in the transmission. CRS data 608 includes or corresponds to CRS data of or associated with: network entity 605, second network entity 607, or both. For illustration, CRS data 608 may include timing and position data (commonly referred to as CRS mode) for CRS data. CRS data 608 may include or indicate one or more CRS modes, and may include or correspond to CRS mode parameters (such as lte-CRS-ToMatchAround). Some CRS mode parameters may include or be associated with multiple CRS modes (thus such CRS mode parameters are known and are referred to as CRS mode lists in the prior art). Such CRS mode parameters (including lists) are referred to as being associated with a specific component carrier in the prior art because they are configured per component carrier.

[0174] The CORESET group data 642 includes or corresponds to data that associates or links a network entity (such as a base station, a cellular cell, or its TRP) (and optionally transmits it) to a specific DMRS, a specific CRS pattern, or both. The CORESET group data 642 may be indicated by higher layer signaling, such as RRC signaling (such as a configuration message). Alternatively, only the network entity includes such association data, and the UE is unaware of such association. In such implementations, the UE may perform DMRS modification (such as shifting), CRS rate matching, or both independently of the network entity association.

[0175] The modification parameter data 644 includes or corresponds to data used by the UE 115 to modify the DMRS data 606, such as being configured to modify the DMRS data 606 to generate modified DMRS data (such as 696, 698). The DMRS data 606 may further include the modified DMRS data (696, 698) of or associated with the network entity 605, the second network entity 607, or both. For illustration, the DMRS data 606 may include a modified position of a DMRS symbol in a transmission.

[0176] The transmitter 610 is configured to transmit data to one or more other devices, and the receiver 612 is configured to receive data from one or more other devices. For example, the transmitter 610 can transmit data, and the receiver 612 can receive data via a network (such as a wired network, a wireless network, or a combination thereof). For example, the UE 115 can be configured to transmit or receive data via a direct device-to-device connection, a local area network (LAN), a wide area network (WAN), a modem-to-modem connection, the Internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the above, or any other communication network now known or later developed that allows two or more electronic devices to communicate. In some implementations, the transmitter 610 and the receiver 612 can be replaced with a transceiver. Additionally or alternatively, the transmitter 610, the receiver 612, or both may include or correspond to the reference Figure 2 One or more components of UE 115 are described.

[0177] The encoder 613 and the decoder 614 may be configured to perform encoding and decoding, respectively, such as encoding or decoding a transmission with a modified DMRS position. The DMRS modifier 615 may be configured to perform DMRS modification. For example, the DMRS modifier 615 is configured to modify the position of one or more DMRS symbols used to encode or decode a transmission. For illustration, in response to determining a conflict or overlap with a CRS resource, a partial or complete overlap with a second transmission, or both, the DMRS modifier 615 adjusts the position of the overlapping DMRS symbols. In some implementations, the DMRS modifier 615 adjusts (such as increasing or decreasing) the position of each DMRS symbol of each transmission (i.e., the DMRS symbols of the first and second transmissions).

[0178] The CRS rate matcher 616 may be configured to perform CRS rate matching of transmissions (such as a first PDSCH transmitted from a first TRP associated with a first value of a higher index or a first PDSCH transmitted from a first TRP associated with a first value of a higher index) around a particular LTE CRS or LTE CRS pattern. Such rate matching procedures enable coexistence of NR and LTE because data transmissions of NR (such as a first PDSCH or a second PDSCH) are rate matched around one or more LTE CRS patterns.

[0179] The network entity 605 includes a processor 630, a memory 632, a transmitter 634, a receiver 636, an encoder 637, a decoder 638, a DMRS modifier 639, a CRS rate matcher 640, and antennas 234a-t. The processor 630 may be configured to execute instructions stored in the memory 632 to perform the operations described herein. In some implementations, the processor 630 includes or corresponds to the controller / processor 240, and the memory 632 includes or corresponds to the memory 242. The memory 632 may be configured to store DMRS data 606, CRS data 608, CORESET group data 642, modification parameters 644, or a combination thereof, similar to the UE 115 and as further described herein.

[0180] The transmitter 634 is configured to transmit data to one or more other devices, and the receiver 636 is configured to receive data from one or more other devices. For example, the transmitter 634 can transmit data, and the receiver 636 can receive data via a network (such as a wired network, a wireless network, or a combination thereof). For example, the network entity 605 can be configured to transmit or receive data via a direct device-to-device connection, a local area network (LAN), a wide area network (WAN), a modem-to-modem connection, the Internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the above, or any other communication network now known or later developed that allows two or more electronic devices to communicate. In some implementations, the transmitter 634 and the receiver 636 can be replaced with a transceiver. Additionally or alternatively, the transmitter 634, the receiver 636, or both may include or correspond to the reference Figure 2 One or more components of the described network entity 605. The encoder 637 and the decoder 638 may include the same functionality as described with reference to the encoder 613 and the decoder 614, respectively. The DMRS modifier 639 and the CRS rate matcher 640 may include the same functionality as described with reference to the DMRS modifier 615 and the CRS rate matcher 616, respectively.

[0181] During operation of the wireless communication system 600, the network entity 605 may determine that the UE 115 has DMRS shift capability for a multi-TRP operation mode (such as a multi-DCI multi-TRP operation mode). For example, the UE 115 may transmit a message 648 (such as a capability message) including a DMRS shift indicator 672. The indicator 672 may indicate an enhanced DMRS shift capability or a specific type of DMRS shift, such as by incrementing a position value. In some implementations, the network entity 605 sends control information to indicate to the UE 115 that the DMRS shift capability for the multi-TRP operation mode will be used. For example, in some implementations, the message 648 (or another message, such as a response or trigger message) is transmitted by the network entity 605.

[0182] exist Figure 6 In the example of , the network entity 605 transmits an optional configuration transmission 649. The configuration transmission 649 may include or indicate a DMRS modification configuration, such as modification parameter data 644. The configuration transmission 649 (such as 644) may indicate how to adjust the position of the DMRS symbols or what type of DMRS shifting mode to operate in (such as per TRP, across all TRPs, independent of CRS rate matching, etc.).

[0183] Following transmission of message 648 (such as a DMRS shift configuration message, such as an RRC message or DCI), transmissions may be scheduled by network entity 605, network entity 607, UE 115, or both. Such scheduled transmissions may include shared channel transmissions, such as PDSCH or PUSCH. Such transmissions may be scheduled by dynamic grants or by periodic grants. Periodic grants are configured to schedule one or more SPS grants, such as PDSCH.

[0184] exist Figure 6 In the example of , the network entity 605 transmits the first message 650 and optionally transmits the second message 660. For example, the network entity 605 is a base station including multiple TRPs, and different TRPs transmit the messages 650, 660. In some other implementations, the second network entity 607 transmits the second message 660. For example, in such implementations, each of the network entities 605, 607 may include or correspond to a TRP of a different panel or a TRP of a different base station.

[0185] The first and second messages 650, 660 may include or correspond to DCI or RRC messages and may be sent via corresponding PDCCHs. The first message 650 and the second message 660 each schedule one or more corresponding downlink transmissions. Figure 6 In the example of , the first message 650 schedules the first transmission 652 and the second message 660 schedules the second transmission 662.

[0186] Each of the first message 650 and the second message 660 has or is associated with a corresponding DMRS for one or more corresponding downlink transmissions. Figure 6 In the embodiment of the present invention, the corresponding DMRS include a first DMRS 692 of or associated with the first transmission 652, and a second DMRS 694 of or associated with the second transmission 662. In some implementations, the first DMRS 692 and the second DMRS 694 are similar. For example, they have the same number of DMRS symbols, and the DMRS symbols are located in symbol positions or time slots (referred to as symbol positions).

[0187] Additionally, each of the first message 650 and the second message 660 has or is associated with a corresponding CRS. The CRS may be associated with a particular network entity transmitting the message, or may be associated with a particular value of a higher layer index configured per CORESET (i.e., associated with a CORESET group representing a TRP). For illustration, each TRP may have an associated CRS pattern. Alternatively, a single CRS pattern may be used for multiple TRPs (such as multiple TRPs for a single base station or serving cell). When multiple CRS patterns are used, the UE 115, the network entity 605, the network entity 607, or a combination thereof may generate a combined CRS pattern (such as a union of CRS patterns for each resource including the multiple CRS patterns).

[0188] After transmission of the first message 650, the second message 660, or both, the UE 115, the network entity 605, the network entity 607, or a combination thereof may determine whether the one or more associated CRS patterns overlap with the associated DMRS of the first message 650 or the second message 660. Figure 6 It is not explained in , but the CRS pattern can be transmitted in messages 650, 660 or other messages (such as through RRC messages or configuration).

[0189] To illustrate, the UE 115 may determine whether any resources of the one or more associated CRS patterns overlap with any resources (such as DMRS symbols) of the first and second DMRS 692, 694 for the first and second transmissions 652, 662 indicated by the messages 650, 660. In response to determining that there is no overlap, the UE 115 may refrain from performing a DMRS shift. For example, the UE 115 may refrain from determining whether one or more CRS resources and DMRS symbols overlap. As another example, the UE 115 may refrain from modifying or not modifying (such as shifting) a DMRS symbol even if the UE 115 determines that one or more CRS resources and DMRS symbols overlap.

[0190] In response to determining the overlap, the UE 115 may perform a DMRS shift. In some implementations, the above determination is performed only when the first transmission 652 and the second transmission 662 overlap at least partially in time, frequency, or both. In such implementations, the above determination is not performed when the first transmission 652 and the second transmission 662 do not overlap (such as when their resources (such as resource blocks (RBs)) are orthogonal and the CRS pattern has no association with the first transmission (or optionally, any transmission)). Examples of overlap include partial overlap of the first transmission 652 with the second transmission 662 in time, frequency, or both, or complete overlap of the first transmission 652 with the second transmission 662 in time, frequency, or both. As an illustrative example, if the transmissions 652, 662 are frequency division multiplexed, they may partially or completely overlap in the time domain (such as by occupying at least one common ODFM symbol in an orthogonal resource block).

[0191] UE 115 and network entity 605 or network entities 605 and 607 modify DMRS 692, 694 to generate modified DMRS 696, 698. Transmissions 652, 662 include the modified DMRS, ie, DMRS 696 and 698, respectively.

[0192] The network entity 605 or the network entities 605 and 607 may encode transmissions 652, 662 to be transmitted, such as via the same serving cell (such as the same CC) or multiple serving cells (such as multiple CCs). For example, the network entity 605 may transmit a first transmission 652 via a first CC 681 and may transmit a second transmission 662 via a second CC 682.

[0193] UE 115 receives transmissions 652, 662 including modified DMRS 696 and 698. For example, UE 115 decodes or processes transmissions 652, 662 based on modified DMRS 696 and 698. Based on decoding of messages 650, 660, transmissions 652, 662, or both, UE 115 may send one or more acknowledgment messages (such as PUCCH) to network entities 605, 607. It should be noted that the acknowledgment message may include or correspond to a positive or negative acknowledgment, such as ACK / NACK. UE 115 may send ACK or NACK based on determining whether the first transmission 652, the second transmission 662, or both are successfully decoded. For illustration, if the decoding is successful, an ACK is communicated; and if the decoding is unsuccessful, a NACK is communicated.

[0194] Reference Figures 7A-7C and 8A-8C , depict diagrams illustrating DMRS modification. Figures 7A-7C is a block diagram illustrating an example of DMRS modification for a single PDSCH. Figures 7A-7Ccorresponds to DMRS modification for a single PDSCH, and Figures 8A-8C Corresponds to DMRS modification for multiple PDSCHs. Figures 7A-7C and Figures 8A-8C In the figure, the code elements of PDSCH are illustrated by pattern filling.

[0195] Reference Fig. 7A , a block diagram illustrating an example DMRS pattern / scheme is illustrated. Fig. 7A An example of a DMRS pattern for a PDSCH (such as a portion thereof) is depicted. Fig. 7A In the example of , the PDSCH (such as the portion of the PDSCH) includes 10 symbols. These 10 symbols can be used for DMRS and data, such as DMRS symbols and data symbols. Fig. 7A As explained in FIG. 1 , the DMRS of the PDSCH includes four DMRS symbols and six data symbols. The four DMRS symbols are located at symbols 1, 5, and 8 of the PDSCH (when numbering starts from 1).

[0196] Reference Figure 7B , illustrating a block diagram of an example CRS mode / scheme. Figure 7B An example of a CRS pattern is depicted. Fig. 7A Similar, in Figure 7B In the example of , the PDSCH includes 10 symbols. All or part of the symbols of the PDSCH may be used for CRS (such as for CRS rate matching) and may correspond to a CRS block. Figure 7B As explained in , CRS includes or occupies four symbols. These four symbols are located at symbols 1, 4, 5 and 8 of the PDSCH (when numbering starts from 1).

[0197] Reference Figure 7C , a block diagram illustrating an example DMRS modification is shown. Figure 7C DMRS shifting by modifying the position of one or more DMRS symbols of a transmission, such as a PDSCH, is illustrated.

[0198] exist Figure 7C In FIG. 1 , a single PDSCH is illustrated. The PDSCH has Fig. 7A Additionally, the PDSCH has or is associated with Figure 7B The CRS model or scheme explained in Figure 7C As explained in , multiple DMRS symbols (their positions) can be Figure 7B. Specifically, each of these DMRS symbols (1, 4, and 8) overlaps with the CRS resource / symbol of the CRS pattern. Accordingly, each DMRS symbol of each PDSCH is modified based on the overlap of one or more DMRS symbols and CRS blocks / positions.

[0199] For example, the position of each DMRS symbol of the PDSCH is modified based on the modification parameter. Figure 7C In the example illustrated in , each DMRS symbol position is incremented by a first value (ie, 1).

[0200] Figures 8A-8C is a block diagram illustrating an example of DMRS modification for multiple PDSCHs. Fig. 8A , a block diagram illustrating an example DMRS pattern / scheme is illustrated. Fig. 8A An example of a DMRS pattern for PDSCH is depicted. Fig. 8A In the example of , the PDSCH includes 14 symbols. The first four symbols are not used by DMRS and are not used for data (ie, are not assigned to PDSCH) and may correspond to gaps or control data. The remaining 10 symbols may be used for DMRS and data. Fig. 8A As explained in FIG. 1 , the DMRS of the PDSCH includes 4 DMRS symbols. The four DMRS symbols are located at symbols 5, 9, and 12 of the PDSCH (when numbering starts from 1).

[0201] Reference Figure 8B , illustrating a block diagram of an example CRS mode / scheme. Figure 8B An example of a CRS pattern (such as one CRS pattern of possibly many CRS patterns configured for a component carrier) is depicted. Fig. 8A Similar, in Figure 8B In the example of , the PDSCH includes 14 symbols. All or part of the symbols of the PDSCH may be used for CRS (such as for CRS rate matching) and may correspond to a CRS block. Figure 8B As explained in , CRS includes or occupies 6 symbols. These six symbols are located at symbols 1, 2, 5, 8, 9 and 12 of the PDSCH (when numbering starts from 1).

[0202] Reference Figure 8C , a block diagram illustrating an example DMRS modification is shown. Figure 8C DMRS shifting by increasing the position of each DMRS symbol of an overlapping transmission such as PDSCH is illustrated.

[0203] exist Figure 8CIn FIG. 1 , two partially overlapping PDSCHs are illustrated. These PDSCHs (which correspond to two TRPs, two higher layer indices, or two CORESET groups) have Fig. 8A Additionally, these PDSCHs have or are associated with Figure 8B Alternatively, the CRS pattern may be associated with only one of these PDSCHs. Figure 8C As explained in Figure 8B . Specifically, each of these DMRS symbols (5, 9, and 12) for each PDSCH overlaps with the CRS resources / symbols of the CRS pattern. Accordingly, each DMRS symbol for each PDSCH is modified based on the overlap of one or more DMRS symbols and CRS blocks / positions. This can be done regardless of the association of the CRS pattern with the two PDSCHs (i.e., for both PDSCHs).

[0204] For example, the position of each DMRS symbol of each PDSCH is modified based on the modification parameter. Figure 8C In the example illustrated in , each DMRS symbol position is incremented by a first value (i.e., 1). Although incrementing is shown, in some other implementations, the DMRS symbol positions may be decremented, divided, multiplied, adjusted using a table or formula, or a combination thereof. Additionally, although a value of 1 is applied to the incrementing of DMRS symbol positions, in some other implementations, other values ​​may be used, such as 2, 3, 4, etc.

[0205] Although each DMRS symbol overlaps with a CRS resource and each DMRS symbol is moved, in some other implementations, each DMRS symbol is moved based on only a single DMRS symbol and CRS resource overlap in one PDSCH. Additionally or alternatively, although these PDSCHs partially overlap in both time and frequency, in some other implementations, these PDSCHs may completely overlap in time, frequency, or both, or may partially overlap in time or frequency.

[0206] When there are one or more CRS patterns (such as lte-CRS-ToMatchAround or its extension for multiple CRS patterns) around which rate matching is to be performed to decide whether any DMRS symbols of two PDSCHs (which correspond to two TRPs, two higher layer indices or two CORESET groups) are shifted, the one or more CRS patterns may be considered for these two PDSCHs regardless of the association of these PDSCHs with these CRS patterns (i.e., the association with these TRPs, higher layer indices or CORESET groups).

[0207] For example, when only one CRS mode or CRS pattern set (such as lte-CRS-ToMatchAround) is configured and associated with the first TRP (such as the first higher layer index value, i.e., the first CORESET group), and two PDSCHs partially / fully overlap, the DMRS of both PDSCHs are shifted, even if the CRS pattern(s) is associated with only one PDSCH (such as the second PDSCH).

[0208] In some implementations, for shifting the DMRS pattern (i.e., in the case where the DMRS and CRS are in the same symbol), the two PDSCHs follow the same behavior regardless of the association of the CRS pattern. Additionally or alternatively, for rate matching, only the first PDSCH may be rate matched around the resources of the CRS pattern, while the second PDSCH may not be rate matched around the resources of the CRS pattern (which is configured for CORESETs and component carriers). That is, even though PDSCH rate matching may take into account the association of the CRS pattern (or CRS pattern list) with the TRP (or with the CORESET group), DMRS shifting is performed regardless of the association of the PDSCH with the TRP (or with the CORESET group) or the association of the CRS pattern (or CRS pattern list) with the TRP (or with the CORESET group).

[0209] The CRS pattern or CRS pattern or list may be generally configured for a multi-TRP UE, configured in a serving cell, and configured for a higher layer index value (i.e., a CORESET group). Accordingly, the one or more CRS patterns are intended as a design option for a component carrier and a TRP (CORESET group) within the component carrier, and thus the one or more CRS patterns are configured for a component carrier and a TRP.

[0210] Although the PDSCHs have the same DMRS pattern in the examples provided herein, in some other implementations, the PDSCHs may have different DMRS patterns from each other. In such implementations, the DMRS pattern of one or both PDSCHs may be adjusted based on a conflict of any DMRS pattern.

[0211] Fig. 9 is a block diagram illustrating example blocks executed by a UE. Each example block will also be related to Fig.11 The description is based on the UE 115 described in the specification. Fig.11 is a block diagram conceptually illustrating an example design of a UE. Fig.11 1. A UE 115 configured according to one aspect of the present disclosure is illustrated. The UE 115 includes a Figure 2 or Figure 6115. For example, the UE 115 includes a controller / processor 280 that operates to execute logic or computer instructions stored in a memory 282 and to control various components of the UE 115 that provide the features and functionality of the UE 115. The UE 115 transmits and receives signals via wireless radios 1101a-r and antennas 252a-r under the control of the controller / processor 280. The wireless radios 1101a-r include various components and hardware, such as those described in Figure 2 As illustrated with respect to UE 115, demodulators / modulators 254a-r, a MIMO detector 256, a receive processor 258, a transmit processor 264, and a TX MIMO processor 266 are included.

[0212] As shown, the memory 282 may include DMRS modification logic 1102, CRS rate matching logic 1103, CORESET group logic 1104, DMRS data 1105, modified DMRS data 1106, DMRS modification data 1107, CRS data 1108, and CORESET group data 1109. The DMRS data 1105, modified DMRS data 1106, DMRS modification data 1107, CRS data 1108, and CORESET group data 1109 may include or correspond to DMRS data 606, CRS data 608, CORESET data 642, and modification parameters 644. The DMRS modification logic 1102 may include or correspond to the DMRS modifier 615. The CRS rate matching logic 1103 may include or correspond to the CRS rate matcher 616. The CORESET group logic 1104 may include or correspond to the DMRS modifier 615, the CRS rate matcher 616, or both. In some aspects, logic 1102-1104 may include or correspond to processor(s) 280. UE 115 may receive / transmit signals from / to one or more base stations, such as base station 105 or one or more network entities 605, 607. When communicating with a single base station or serving cell, UE 115 may receive / transmit signals from / to multiple TRPs of the single base station or serving cell.

[0213] Reference Fig. 9 At block 900, a UE receives a configuration message including at least one CRS pattern list for a component carrier. A list in the at least one list is associated with a control resource set (CORESET) group.

[0214] At block 901 , a UE receives a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier.

[0215] At block 902, the UE receives a second message scheduling a second transmission associated with a second DMRS and for the component carrier. In some implementations, the first and second messages are DCI or RRC messages. Additionally or alternatively, the first and second transmissions are PDSCH transmissions. In some implementations, the first and second DMRSs may be aligned (such as having the same symbol position).

[0216] In block 903, the UE may optionally determine whether one or more CRS patterns overlap with the first DMRS or the second DMRS. The determination may be based on whether the one or more CRS patterns are configured for the UE (e.g., as described in Section 7.4.1.1.2 of Technical Specification (TS) 38.211 v16.1.0). In some implementations, a single CRS pattern associated with multiple TRPs is used. In some other implementations, each TRP has an associated CRS pattern, and each CRS pattern is checked to see if it overlaps with each DMRS.

[0217] At block 904, the UE modifies at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS based on the list being configured for the component carrier.

[0218] In some implementations, the method may further include determining whether the first transmission at least partially overlaps with the second transmission (such as the same component carrier but different CORESET groups). For example, checking whether the first resources of the first transmission overlap with the second resources of the second transmission in the time domain, the frequency domain, or both. In some such implementations, one or more of the previously described boxes are performed in response to or based on this determination. For illustration, based on the UE determining that the first transmission does not overlap with the second transmission (such as in the case of orthogonal resource blocks), DMRS modification or overlap determination may not be performed.

[0219] In some implementations, the method may further include receiving the first and second transmissions using the modified DMRS symbols. To illustrate, the UE 115 may receive the first and second transmissions with DMRS symbol positions shifted compared to the DMRS pattern indicated by or associated with the corresponding first and second messages.

[0220] Fig.10 is a block diagram illustrating example blocks executed by a network entity. The network entity may include or correspond to a base station or a TRP thereof configured according to an aspect of the present disclosure. The example blocks will also be related to Fig.12 The description is based on the gNB 105 (or eNB) described in the specification. Fig.12 is a block diagram conceptually illustrating an example design of network entities. Fig.12 An exemplary gNB 105 configured according to one aspect of the present disclosure is illustrated. The gNB 105 includes Figure 2 105. For example, the gNB 105 includes a controller / processor 240 that operates to execute logic or computer instructions stored in a memory 242 and to control the components of the gNB 105 that provide the features and functionality of the gNB 105. Under the control of the controller / processor 240, the gNB 105 transmits and receives signals via the wireless radios 1201a-t and antennas 234a-t. The wireless radios 1201a-t include various components and hardware, such as those described in Figure 2 As illustrated in relation to gNB 105, includes modulator / demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230. Data 1202-1209 in memory 242 may include or correspond to corresponding data 1102-1109 in memory 282, respectively.

[0221] Reference Fig.10 , at block 1000, a network entity transmits a configuration message including at least one CRS pattern list for a component carrier. The list of at least one list is associated with a control resource set (CORESET) group.

[0222] At block 1001 , a network entity transmits a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier.

[0223] At block 1002, the network entity transmits a second message scheduling a second transmission associated with a second DMRS and for the component carrier. In some implementations, the first and second messages are DCI or RRC messages. Additionally or alternatively, the first and second transmissions are PDSCH transmissions. In some implementations, the first and second DMRSs may be identical (such as having identical symbol positions).

[0224] In block 1003, the network entity may optionally determine whether one or more CRS patterns overlap with the first DMRS or the second DMRS. The determination may be based on whether the one or more CRS patterns are configured for the UE (e.g., as described in Section 7.4.1.1.2 of 5G NR Technical Specification (TS) 38.211 v16.1.0). In some implementations, a single CRS pattern associated with multiple TRPs is used. In some other implementations, each TRP has an associated CRS pattern, and each CRS pattern is checked to see if it overlaps with each DMRS.

[0225] At block 1004, the network entity modifies at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier.

[0226] In some implementations, the method may further include determining whether the first transmission at least partially overlaps with the second transmission (such as the same component carrier but different CORESET groups). For example, checking whether the first resources of the first transmission overlap with the second resources of the second transmission in the time domain, the frequency domain, or both. In some such implementations, one or more of the previously described boxes are performed in response to or based on this determination. For illustration, based on the network entity determining that the first transmission does not overlap with the second transmission (such as in the case of orthogonal resource blocks), DMRS modification or overlap determination may not be performed.

[0227] In some implementations, the method may further include transmitting the first transmission, the second transmission, or both. When transmitted, the first and second transmissions may have modified DMRS symbols. To illustrate, the network entity may transmit the first and second transmissions with DMRS symbol positions shifted compared to the DMRS pattern indicated by or associated with the corresponding first and second messages.

[0228] It should be noted that reference Fig. 9 and Fig.10 One or more blocks (or operations) described may be combined with one or more blocks (or operations) in another figure. Fig. 9 and Fig.10 One or more boxes can be connected with Figure 2 , 3 , 4, 6 or 10. Additionally or alternatively, the above reference Figure 1-6 One or more of the operations described may be combined with Fig. 9 and Fig.10 A combination of one or more of the operations described.

[0229] Those skilled in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0230] The components, functional blocks and modules described herein (such as Figure 6 Components Fig. 9 and Fig.10 Function box, and Figure 2Modules in the present invention) may include processors, electronic devices, hardware devices, electronic components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof. In addition, the components, functional blocks, and modules (such as Figure 6 Components Fig. 9 and Fig.10 Function box, and Figure 2 Features related to the modules in the embodiment may be implemented via a dedicated processor circuit system, via executable instructions, or a combination thereof.

[0231] The technician will further appreciate that the various illustrative logic boxes, modules, circuits, and algorithm steps described in conjunction with the disclosure herein can be implemented as electronic hardware, computer software, or a combination of the two. To clearly explain this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described in the form of their functionality above. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. The technician can implement the described functionality in different ways for each specific application, but such implementation decisions should not be interpreted as causing departure from the scope of the present disclosure. The technician will also easily recognize that the order or combination of components, methods, or interactions described herein are only examples and the components, methods, or interactions of various aspects of the present disclosure can be combined or performed in a manner different from those explained and described herein.

[0232] The various illustrative logics, logic blocks, modules, circuits, and algorithmic processes described in conjunction with the implementations disclosed herein may be implemented as electronic hardware, computer software, or a combination of both. This interchangeability of hardware and software has been generally described in terms of their functionality and illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented in hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0233] The hardware and data processing devices for implementing the various illustrative logics, logic blocks, modules, and circuits described in conjunction with the aspects disclosed herein may be implemented or executed with a general purpose single-chip or multi-chip processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device designed to perform the functions described herein, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine. In some implementations, a processor may be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in cooperation with a DSP core, or any other such configuration. In some implementations, specific processes and methods may be performed by circuit systems dedicated to a given function.

[0234] In one or more aspects, the functions described may be implemented in hardware, digital electronic circuitry, computer software, firmware (including the structures disclosed in this specification and their structural equivalents), or in any combination thereof. Implementations of the subject matter described in this specification may also be implemented as one or more computer programs, i.e., one or more modules of computer program instructions encoded on a computer storage medium for execution by a data processing apparatus or for controlling the operation of a data processing apparatus.

[0235] If implemented in software, each function can be stored on a computer-readable medium or transmitted therethrough as one or more instructions or codes. The process of the method or algorithm disclosed herein can be implemented in a processor executable software module that can reside on a computer-readable medium. Computer-readable media include both computer storage media and communication media, including any medium that can be implemented to transfer a computer program from one place to another. Storage media can be any available medium that can be accessed by a computer. As an example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other medium that can be used to store the desired program code in the form of an instruction or data structure and can be accessed by a computer. Any connection may also be appropriately referred to as a computer-readable medium. As used herein, disks and discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks and blue-ray discs, wherein disks often reproduce data magnetically and discs reproduce data optically with lasers. The above combination should also be included in the scope of computer-readable media. Additionally, the operations of a method or algorithm may reside as one or any combination or set of codes and instructions on a machine-readable medium and a computer-readable medium, which may be incorporated into a computer program product.

[0236] Various modifications to the implementations described in this disclosure may be apparent to those skilled in the art, and the universal principles defined herein may be applied to other implementations without departing from the spirit or scope of the disclosure. Thus, the claims are not intended to be limited to the implementations shown herein, but should be granted the widest scope consistent with the disclosure, the principles and novel features disclosed herein.

[0237] In addition, one of ordinary skill in the art will readily appreciate that the terms "upper" and "lower / lower" are sometimes used for convenience in describing the drawings and indicate relative positions corresponding to the orientation of the drawings on a correctly oriented page, and may not reflect the actual orientation of any device as implemented.

[0238] Certain features described in this specification in the context of separate implementations may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations separately or in any suitable subcombination. Furthermore, while features may be described above as functioning in certain combinations and even initially claimed as such, one or more features from a claimed combination may in some cases be removed from the combination, and a claimed combination may be directed to a subcombination, or variations of a subcombination.

[0239] Similarly, although operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring such operations to be performed in the particular order shown or in a sequential order, or to perform all the operations described in order to achieve the desired result. In addition, the accompanying drawings may schematically depict one or more example processes in the form of a flow chart. However, other operations not depicted may be incorporated into the schematically illustrated example process. For example, one or more additional operations may be performed before, after, simultaneously or between any illustrated operations. In some environments, multitasking and parallel processing may be advantageous. In addition, the separation of various system components in the implementation described above should not be understood as requiring such separation in all implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products. Additionally, other implementations also fall within the scope of the appended claims. In some cases, the actions described in the claims may be performed in different orders and still achieve the desired result.

Claims

1. A wireless communication method, comprising: receiving, by a user equipment (UE), a configuration message comprising at least one list of cell-specific reference signal (CRS) patterns for a component carrier, wherein a list of the at least one list is associated with a control resource set (CORESET) group; receiving, by the UE, a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier; receiving, by the UE, a second message scheduling a second transmission associated with a second DMRS and for the component carrier; as well as Modifying, by the UE, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS configured for the component carrier based on the list, wherein the first DMRS includes a plurality of DMRS symbols, and wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS includes: The position value of each DMRS symbol in the plurality of DMRS symbols of the first DMRS of the first transmission is incremented by 1.

2. The method of claim 1, wherein: The first transmission is associated with the CORESET group, and wherein the second transmission is associated with a second CORESET group.

3. The method of claim 1, wherein: Determining that the at least one list is configured for DMRS shifting indicates that one or more CRS patterns overlap with the first DMRS or the second DMRS.

4. The method of claim 1, further comprising: The UE determines whether one or more CRS patterns of the at least one list overlap with the first DMRS or the second DMRS, wherein modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS is further responsive to determining that at least one CRS pattern of the one or more CRS patterns overlaps with at least one DMRS symbol of the first DMRS or the second DMRS.

5. The method of claim 1, wherein: The at least one CRS pattern list is configured for the component carrier to enable DMRS shifting, rate matching, or both.

6. The method of claim 1, wherein: Modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS further comprises: The at least one DMRS symbol of the second DMRS is modified.

7. The method of claim 1, further comprising: The first transmission is received by the UE, the first transmission having modified DMRS symbols.

8. The method of claim 7, further comprising: The second transmission is received by the UE, the second transmission having a plurality of modified DMRS symbols.

9. A device for wireless communication, comprising: at least one processor; as well as a memory coupled to the at least one processor, wherein the at least one processor is configured to: receiving a configuration message comprising at least one list of cell-specific reference signal (CRS) patterns for a component carrier, wherein a list of the at least one list is associated with a control resource set (CORESET) group; receiving a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier; receiving a second message scheduling a second transmission associated with a second DMRS and for the component carrier; as well as modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS based on the list being configured for the component carrier, wherein the first DMRS comprises a plurality of DMRS symbols, and wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises: The position value of each DMRS symbol in the plurality of DMRS symbols of the first DMRS of the first transmission is incremented by 1.

10. The device of claim 9, wherein: The apparatus is operating in a multiple downlink control information (DCI) multiple transmission reception point (TRP) mode.

11. The device of claim 9, wherein: The second CORESET group is associated with a second CRS pattern list of the at least one CRS pattern list.

12. The apparatus of claim 9, wherein: The first message is received on a physical downlink control channel (PDCCH), and wherein the first transmission is received on a physical downlink shared channel (PDSCH).

13. The apparatus of claim 9, wherein: Modifying at least one DMRS symbol of the first DMRS or the second DMRS further comprises: A position of the at least one DMRS symbol of the second DMRS is adjusted.

14. The apparatus of claim 9, wherein: Modifying at least one DMRS symbol of the first DMRS or the second DMRS further comprises: The position value of each DMRS symbol of the second DMRS of the second transmission is incremented by 1.

15. The apparatus of claim 9, wherein: The device performs DMRS shifting for multiple downlink control information (DCI) multiple transmission reception point (TRP) mode independent of CRS and TRP association.

16. The apparatus of claim 9, wherein: The apparatus performs DMRS shifting across a plurality of transmit receive points (TRPs), and wherein the apparatus performs rate matching per TRP.

17. A wireless communication method, comprising: transmitting, by a network entity, a configuration message, the configuration message comprising at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein a list among the at least one list is associated with a control resource set (CORESET) group; transmitting, by the network entity, a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier; transmitting, by the network entity, a second message scheduling a second transmission associated with a second DMRS and for the component carrier; as well as modifying, by the network entity in response to determining that the list is configured for the component carrier, at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS, wherein the first DMRS comprises a plurality of DMRS symbols, and wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises: The position value of each DMRS symbol in the plurality of DMRS symbols of the first DMRS of the first transmission is incremented by 1.

18. The method of claim 17, wherein: The first transmission is associated with the CORESET group, and wherein the second transmission is associated with a second CORESET group.

19. The method of claim 17, wherein: Modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS includes: The at least one DMRS symbol of the first DMRS and the at least one DMRS symbol of the second DMRS are modified.

20. The method of claim 17, further comprising: transmitting, by the network entity, the first transmission having modified DMRS symbols; transmitting, by the network entity, the second transmission having modified DMRS symbols; or Both.

21. The method of claim 17, wherein: The second CORESET group is associated with a second CRS pattern list of the at least one CRS pattern list.

22. The method of claim 17, wherein: The first message corresponds to downlink control information (DCI).

23. The method of claim 17, wherein: The first message includes a periodic grant and corresponds to a downlink control information (DCI) or a radio resource control (RRC) message configured to schedule a plurality of transmissions including the first transmission.

24. A device for wireless communication, comprising: at least one processor; as well as a memory coupled to the at least one processor, wherein the at least one processor is configured to: transmitting a configuration message comprising at least one cell-specific reference signal (CRS) pattern list for a component carrier, wherein a list among the at least one list is associated with a control resource set (CORESET) group; transmitting a first message scheduling a first transmission associated with a first demodulation reference signal (DMRS) and for the component carrier; transmitting a second message scheduling a second transmission associated with a second DMRS and for the component carrier; as well as modifying at least one DMRS symbol of the first DMRS or at least one DMRS symbol of the second DMRS in response to determining that the list is configured for the component carrier, wherein the first DMRS comprises a plurality of DMRS symbols, and wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS comprises: The position value of each DMRS symbol in the plurality of DMRS symbols of the first DMRS of the first transmission is incremented by 1.

25. The apparatus of claim 24, wherein: Modifying at least one DMRS symbol of the first DMRS or the second DMRS further comprises: A position of the at least one DMRS symbol of the second DMRS is adjusted.

26. The apparatus of claim 24, wherein the second DMRS comprises a plurality of DMRS symbols, and wherein modifying at least one DMRS symbol of the first DMRS or the second DMRS further comprises: The position value of each DMRS symbol in the plurality of DMRS symbols of the second DMRS of the second transmission is incremented by 1.

27. The apparatus of claim 24, wherein: The first resources of the first transmission at least partially overlap with the second resources of the second transmission in the time domain, the frequency domain, or both.

28. The apparatus of claim 24, wherein: The first resources of the first transmission are orthogonal to the second resources of the second transmission in the time domain, the frequency domain, or both.

29. The apparatus of claim 24, wherein: The first resources of the first transmission do not overlap with the second resources of the second transmission in the time domain, the frequency domain, or both.

30. The apparatus of claim 24, wherein: The first message corresponds to the CORESET group, wherein the second message corresponds to a second CORESET group, and wherein each CORESET group is indicated by higher layer signaling.

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