Dynamic switching between different multiple send / receive point schemes

Abstract

Methods, systems, and devices for wireless communications are described. In some systems, a network may schedule a user equipment (UE) for multiple transmit / receive point (TRP) communications. The network may send a single downlink control information (DCI) message to the UE to dynamically configure multiple transmission configuration indicator (TCI) states for multiple TRPs. In a first example, the DCI message may include a bit field indicating a set of antenna ports and a multi-TRP scheme for transmission. In a second example, the DCI message may include a separate field indicating a multi-TRP scheme (e.g., based on UE capabilities). In a third example, the DCI may indicate redundancy versions (RVs) for different TRPs in the RV field or across multiple fields. In a fourth example, the DCI may include an indication of a precoding resource block group (PRG) size, which may be interpreted differently based on the indicated multi-TRP scheme.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. Patent Application No. 16 / 789,321, filed on February 12, 2020 by KHOSHNEVISAN et al., entitled “DYNAMICSWITCHING BETWEEN DIFFERENT MULTI-TRANSMISSION / RECEPTION POINT SCHEMES,” and U.S. Provisional Patent Application No. 62 / 805,661, filed on February 14, 2019 by KHOSHNEVISAN et al., entitled “DYNAMICSWITCHING BETWEEN DIFFERENT MULTI-TRANSMISSION / RECEPTION POINT SCHEMES,” each of which is assigned to the present assignee. Background Art

[0003] The following relates generally to wireless communications, and more particularly to dynamic switching between different multiple transmit / receive point (TRP) schemes.

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, LTE advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may use techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include multiple base stations or network access nodes, each of which simultaneously supports communication with multiple communication devices, which may be referred to as user equipment (UE).

[0005] In some wireless communication systems, a base station may communicate with a UE using a TRP. For example, the network may communicate with the UE using a single TRP at the base station, using multiple TRPs corresponding to the same base station, or using multiple TRPs corresponding to multiple base stations. In the case where the network communicates with the UE using multiple TRPs, the network may communicate using multiple different multi-TRP schemes, whether at the same base station or at different base stations. In addition, different communication schemes may require configuration of different scheme-specific parameters. Summary of the invention

[0006] The described technology relates to improved methods, systems, devices and apparatuses for supporting dynamic switching between different multiple transmit / receive point (TRP) schemes. In general, the described technology provides for using one or more fields in a downlink control information (DCI) message to indicate a specific multiple TRP scheme (e.g., a spatial division multiplexing (SDM) scheme, a frequency division multiplexing (FDM) scheme, a time division multiplexing (TDM) scheme, or any other multiplexing scheme). The payload size of the DCI message can remain the same, regardless of the indicated multiple TRP scheme.

[0007] In some wireless communication systems, the network may use a multi-TRP scheme to schedule a user equipment (UE) for communication. The network may send a single DCI message to the UE to dynamically configure multiple transmission configuration indicator (TCI) states for multiple TRPs. For example, the base station may generate information bits indicating the selected multi-TRP scheme for the DCI message. In a first example, the DCI message may include a bit field indicating an antenna port set and a multi-TRP scheme for transmission. In a second example, the DCI message may include a separate field indicating a multi-TRP scheme (e.g., if the UE is configured to operate according to a multi-TRP scheme, a separate field is used to indicate the scheme). In a third example, the DCI message may indicate the same or different redundancy versions (RVs) for different TRPs in the RV field or using multiple fields. In a fourth example, the DCI message may include an indication of a precoding resource block group (PRG) size, which may be interpreted differently based on the indicated multi-TRP scheme (e.g., if the scheme is an FDM scheme). The UE may receive the DCI message, decode the information in the field, and determine the indicated multi-TRP scheme for communication with the network.

[0008] A method for wireless communication is described. The method may include generating a first bit set indicating a TCI state set for communicating with a UE, generating a second bit set indicating an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based on the first bit set indicating the TCI state set, and sending a DCI message including an indication of the first bit set and the second bit set to the UE. Using such a DCI message, a base station can dynamically switch between different schemes while maintaining the same DCI size regardless of the scheme and / or parameters. A UE receiving the DCI message can interpret the second bit set based on the first bit set, so that the UE can recognize that the DCI corresponds to more than one TCI state, and can identify the scheme (e.g., a multi-TRP scheme) based on a (multi) antenna port table specific to multiple TCI states.

[0009] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to generate a first bit set indicating a TCI state set for communicating with a UE, generate a second bit set indicating an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based on the first bit set indicating the TCI state set, and send a DCI message including an indication of the first bit set and the second bit set to the UE.

[0010] Another apparatus for wireless communication is described. The apparatus may include components for: generating a first bit set indicating a TCI state set for communicating with a UE, generating a second bit set indicating an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based on the first bit set indicating the TCI state set, and sending a DCI message including an indication of the first bit set and the second bit set to the UE.

[0011] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to generate a first set of bits indicating a TCI state set for communicating with a UE, generate a second set of bits indicating an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based on the first set of bits indicating the TCI state set, and send a DCI message including an indication of the first set of bits and the second set of bits to the UE.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for selecting a lookup table from a set of lookup tables that maps both the antenna port group and the multi-TRP scheme to a second set of bits, wherein generating the second set of bits may be based on the selection. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for configuring a lookup table, a set of lookup tables, or a combination thereof, and sending an indication of the lookup table, the set of lookup tables, or a combination thereof to the UE. In this way, the UE can determine different schemes or parameters using different lookup tables, wherein at least one lookup table corresponds to a single TRP operation and at least one lookup table corresponds to a multi-TRP operation.

[0013] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the second set of bits further indicates a modulation order for at least one TCI state in the set of TCI states. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the second set of bits further indicates an RV of a transport block (TB) for at least one TCI state in the set of TCI states. In some such examples, using the second set of bits to indicate the modulation order, the RV, or both can further improve the signaling efficiency of the scheme parameters.

[0014] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the multi-TRP scheme includes a joint SDM scheme, a separate SDM scheme, a joint FDM scheme, a separate FDM scheme, a joint TDM scheme, a separate TDM scheme, or a combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the second bit set includes the same number of bits as the bit set indicating the antenna port set for single TRP operation. In some cases, the UE can efficiently process DCI messages for multi-TRP operation and single TRP operation because the UE can monitor information of the same size regardless of whether the DCI information corresponds to a single TRP scheme or a multi-TRP scheme.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a lookup table mapping both antenna port sets and multi-TRP schemes to a second set of bits may be pre-configured in a memory.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, multi-TRP operations include communicating with a UE through a set of TRPs at a base station or distributed across a set of base stations.

[0017] A method for wireless communication at a UE is described. The method may include receiving a DCI message including an indication of a first bit set and a second bit set from a base station, identifying a TCI state set for communicating with the base station using the first bit set, and identifying an antenna port set and a multi-TRP scheme from a possible set of schemes for multi-TRP operation using the second bit set based on identifying the TCI state set. A UE receiving a DCI message may interpret the second bit set based on the first bit set, so that the UE may recognize that the DCI corresponds to a plurality of one TCI states, and may identify a scheme (e.g., a multi-TRP scheme) based on an antenna port (multiple) table specific to the plurality of TCI states. This may support the UE to efficiently switch between different schemes and parameters.

[0018] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to receive a DCI message including an indication of a first bit set and a second bit set from a base station, identify a TCI state set for communication with the base station using the first bit set, and identify an antenna port set and a multi-TRP scheme from a possible set of schemes for multi-TRP operation using the second bit set based on identifying the TCI state set.

[0019] Another apparatus for wireless communication at a UE is described. The apparatus may include components for: receiving a DCI message including an indication of a first bit set and a second bit set from a base station, identifying a TCI state set for communicating with the base station using the first bit set, and identifying an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation using the second bit set based on identifying the TCI state set.

[0020] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to receive a DCI message including an indication of a first set of bits and a second set of bits from a base station, identify a TCI state set for communication with the base station using the first set of bits, and identify an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation using the second set of bits based on identifying the TCI state set.

[0021] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for selecting a lookup table from a set of lookup tables that maps a second set of bits to both a set of antenna ports and a multi-TRP scheme, wherein the set of antenna ports and the multi-TRP scheme may be identified based on the selection. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a configuration of a lookup table, a set of lookup tables, or a combination thereof from a base station. In this way, the UE can determine different schemes or parameters using different lookup tables, wherein at least one lookup table corresponds to a single TRP operation and at least one lookup table corresponds to a multi-TRP operation.

[0022] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for using a second set of bits to identify a modulation order for at least one TCI state in the set of TCI states. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for using a second set of bits to identify an RV of a TB for at least one TCI state in the set of TCI states. In some such examples, using a second set of bits to identify the modulation order, the RV, or both may further improve the efficiency of signaling notification of scheme parameters.

[0023] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the multi-TRP scheme includes a joint SDM scheme, a separate SDM scheme, a joint FDM scheme, a separate FDM scheme, a joint TDM scheme, a separate TDM scheme, or a combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the second bit set includes the same number of bits as the bit set indicating the antenna port set for single TRP operation. In some cases, the UE can efficiently process DCI messages for multi-TRP operation and single TRP operation because the UE can monitor messages of the same size regardless of whether the DCI message corresponds to a single TRP scheme or a multi-TRP scheme.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a lookup table that maps a second set of bits to both a set of antenna ports and a multi-TRP scheme may be pre-configured in a memory.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, multi-TRP operations include communications with a set of TRPs at a base station or distributed across a set of base stations including at least the base station.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a set of messages from a set of TRPs based on identifying a multi-TRP scheme.

[0027] A method for wireless communication is described. The method may include identifying that a UE is configured for multi-TRP operation, generating a first set of bits indicating one or more TCI states for communicating with the UE, generating a second set of bits based on the UE being configured for multi-TRP operation, wherein the second set of bits indicates a multi-TRP scheme from a set of possible schemes for multi-TRP operation or a single TRP scheme for single TRP operation, and sending a DCI message to the UE including an indication of the first set of bits and the second set of bits.

[0028] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to recognize that a UE is configured for multi-TRP operation, generate a first bit set indicating one or more TCI states for communicating with the UE, generate a second bit set based on the UE being configured for multi-TRP operation, wherein the second bit set indicates a multi-TRP scheme from a set of possible schemes for multi-TRP operation or a single TRP scheme for single TRP operation, and send a DCI message including an indication of the first bit set and the second bit set to the UE.

[0029] Another apparatus for wireless communication is described. The apparatus may include components for: identifying that a UE is configured for multi-TRP operation, generating a first set of bits indicating one or more TCI states for communicating with the UE, generating a second set of bits based on the UE being configured for multi-TRP operation, wherein the second set of bits indicates a multi-TRP scheme from a set of possible schemes for multi-TRP operation or a single TRP scheme for single TRP operation, and sending a DCI message to the UE including an indication of the first set of bits and the second set of bits.

[0030] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to identify that a UE is configured for multi-TRP operation, generate a first set of bits indicating one or more TCI states for communicating with the UE, generate a second set of bits based on the UE being configured for multi-TRP operation, wherein the second set of bits indicates a multi-TRP scheme from a set of possible schemes for multi-TRP operation or a single TRP scheme for single TRP operation, and send a DCI message to the UE including an indication of the first set of bits and the second set of bits.

[0031] In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, generating the second set of bits may include operations, features, components, or instructions for determining that the one or more TCI states include a plurality of TCI states, and identifying the second set of bits based on a lookup table that maps a multi-TRP scheme for a set of TCI states to a second set of bits. Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for configuring a lookup table and sending an indication of the lookup table to the UE.

[0032] In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, a second set of bits may be generated based on whether the first set of bits indicates one TCI state or multiple TCI states. In other examples of methods, apparatuses, and non-transitory computer-readable media described herein, a first set of bits may be generated based on whether the second set of bits indicates a multi-TRP scheme or a single TRP scheme.

[0033] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication of a capability of the UE from a UE, wherein the UE may be identified as being configured for multi-TRP operation based on the capability of the UE.

[0034] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more TCI states include multiple TCI states, and the multi-TRP scheme is an SDM multi-TRP scheme. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for generating a third bit set indicating an antenna port set for communicating with the UE, wherein a first antenna port set of antenna ports corresponds to a first TCI state of the TCI state set, and a second antenna port set of antenna ports corresponds to a second TCI state of the TCI state set, and wherein the DCI message also includes an indication of the third bit set.

[0035] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more TCI states include a plurality of TCI states. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for generating a third bit set, the third bit set indicating an antenna port set used to communicate with the UE and whether the multi-TRP scheme is an SDM multi-TRP scheme, wherein the second bit set may be generated based on whether the multi-TRP scheme is an SDM multi-TRP scheme, and wherein the DCI message also includes an indication of the third bit set.

[0036] In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the one or more TCI states include a plurality of TCI states, and the second set of bits further indicates a modulation order of at least one TCI state in the set of TCI states. In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the one or more TCI states include a plurality of TCI states, and the second set of bits further indicates an RV of a TB for at least one TCI state in the set of TCI states.

[0037] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a lookup table mapping a multi-TRP scheme for a set of TCI states to a second set of bits may be pre-configured in a memory.

[0038] A method for wireless communication at a UE is described. The method may include receiving a DCI message including an indication of a first set of bits and a second set of bits from a base station, identifying one or more TCI states for communication with the base station using the first set of bits, and identifying a multi-TRP scheme from a set of possible schemes for multi-TRP operation or identifying a single TRP scheme for single TRP operation using the second set of bits and based on the UE being configured for multi-TRP operation.

[0039] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to receive a DCI message including an indication of a first set of bits and a second set of bits from a base station, identify one or more TCI states for communication with the base station using the first set of bits, and identify a multi-TRP scheme from a set of possible schemes for multi-TRP operation or identify a single TRP scheme for single TRP operation using the second set of bits and based on the UE being configured for multi-TRP operation.

[0040] Another apparatus for wireless communication at a UE is described. The apparatus may include means for receiving a DCI message including an indication of a first set of bits and a second set of bits from a base station, identifying one or more TCI states for communicating with the base station using the first set of bits, and identifying a multi-TRP scheme from a set of possible schemes for multi-TRP operation or identifying a single TRP scheme for single TRP operation using the second set of bits and based on the UE being configured for multi-TRP operation.

[0041] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to receive a DCI message including an indication of a first set of bits and a second set of bits from a base station, identify one or more TCI states for communication with the base station using the first set of bits, and identify a multi-TRP scheme from a set of possible schemes for multi-TRP operation or identify a single TRP scheme for single TRP operation using the second set of bits and based on the UE being configured for multi-TRP operation.

[0042] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more TCI states include a plurality of TCI states. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a multi-TRP scheme based on mapping a second set of bits to a lookup table of a multi-TRP scheme for a set of TCI states. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a configuration of a lookup table from a base station.

[0043] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a multi-TRP scheme or a single TRP scheme may be identified based on whether a first set of bits indicates one TCI state or multiple TCI states. In other examples of the methods, apparatuses, and non-transitory computer-readable media described herein, one or more TCI states may be identified based on whether a second set of bits indicates a multi-TRP scheme or a single TRP scheme.

[0044] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending an indication of a capability of the UE to a base station, wherein the capability of the UE indicates that the UE is configured for multi-TRP operation.

[0045] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI message may include an indication of a third set of bits, the one or more TCI states may include multiple TCI states, and the multi-TRP scheme may be an example of an SDM multi-TRP scheme. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for using a third set of bits to identify a set of antenna ports for communicating with a base station, wherein a first set of antenna ports corresponds to a first TCI state of the set of TCI states, and a second set of antenna ports corresponds to a second TCI state of the set of TCI states.

[0046] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI message may include an indication of a third bit set, and the one or more TCI states may include multiple TCI states. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for using a third bit set to identify a set of antenna ports for communicating with a base station and whether a multi-TRP scheme includes an SDM multi-TRP scheme, wherein a multi-TRP scheme or a single TRP scheme may be identified based on whether the multi-TRP scheme includes an SDM multi-TRP scheme.

[0047] In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the one or more TCI states include a plurality of TCI states. Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a modulation order of at least one TCI state in the set of TCI states using a second set of bits. Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying an RV of a TB for at least one TCI state in the set of TCI states using a second set of bits.

[0048] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a lookup table that maps a second set of bits to a multi-TRP scheme for a set of TCI states may be preconfigured in a memory.

[0049] A method for wireless communication is described. The method may include determining to transmit to a UE using a TCI state set, performing a rate matching process including joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set, generating a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state, and sending a DCI message including an indication of the bit set to the UE.

[0050] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to determine to use a TCI state set for transmission to a UE, perform a rate matching process, the rate matching process including joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set, generate a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state, and send a DCI message including an indication of the bit set to the UE.

[0051] Another apparatus for wireless communication is described. The apparatus may include components for: determining to use a TCI state set for transmission to a UE; performing a rate matching process, the rate matching process including joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set; generating a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state; and sending a DCI message including an indication of the bit set to the UE.

[0052] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to determine to use a TCI state set for transmission to a UE, perform a rate matching process including joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set, generate a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state, and send a DCI message including an indication of the bit set to the UE.

[0053] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the set of bits may be a first set of bits, and the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for generating a second set of bits indicating whether the rate matching process includes joint rate matching or separate rate matching, wherein the DCI message also includes an indication of the second set of bits. In other examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the set of bits further indicates whether the rate matching process includes joint rate matching or separate rate matching.

[0054] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for selecting between a first lookup table that maps a joint RV to a set of bits and a second lookup table that maps a combination of the first RV and the second RV to a set of bits, wherein the generation may be based on the selection. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first lookup table, the second lookup table, or a combination thereof may be preconfigured in a memory. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for configuring the first lookup table, the second lookup table, or a combination thereof, and sending an indication of the first lookup table, the second lookup table, or a combination thereof to the UE.

[0055] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, generating a bit set may include an operation, feature, component, or instruction for identifying the bit set based on a lookup table that maps one or more RVs to the bit set. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the lookup table may be pre-configured in a memory. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include an operation, feature, component, or instruction for configuring a lookup table and sending an indication of the lookup table to the UE.

[0056] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the rate matching process may be an example of a separate rate matching, and the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing a time slot aggregation process on a TB on a time slot set, wherein for each time slot in the time slot set, the bit set further indicates a first RV for a first TCI state and a second RV for a second TCI state.

[0057] A method for wireless communication at a UE is described. The method may include receiving a DCI message including an indication of a set of bits from a base station, determining a rate matching process performed by the base station, wherein the rate matching process includes joint rate matching or separate rate matching of TBs for a first TCI state of a set of TCI states and a second TCI state of the set of TCI states, and using the set of bits and based on the rate matching process, if the rate matching process includes joint rate matching, identifying a joint RV for the first TCI state and the second TCI state, or if the rate matching process includes separate rate matching, identifying a first RV for the first TCI state and a second RV for the second TCI state.

[0058] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to receive a DCI message including an indication of a bit set from a base station, determine a rate matching process performed by the base station, wherein the rate matching process includes joint rate matching or separate rate matching of TBs for a first TCI state of a TCI state set and a second TCI state of the TCI state set, and use the bit set and based on the rate matching process, if the rate matching process includes joint rate matching, identify a joint RV for the first TCI state and the second TCI state, or if the rate matching process includes separate rate matching, identify a first RV for the first TCI state and a second RV for the second TCI state.

[0059] Another apparatus for wireless communication at a UE is described. The apparatus may include means for receiving a DCI message including an indication of a set of bits from a base station, determining a rate matching process performed by the base station, wherein the rate matching process includes joint rate matching or separate rate matching of TBs for a first TCI state of a set of TCI states and a second TCI state of the set of TCI states, and using the set of bits and based on the rate matching process, identifying a joint RV for the first TCI state and the second TCI state if the rate matching process includes joint rate matching, or identifying a first RV for the first TCI state and a second RV for the second TCI state if the rate matching process includes separate rate matching.

[0060] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to receive a DCI message including an indication of a bit set from a base station, determine a rate matching process performed by the base station, wherein the rate matching process includes joint rate matching or separate rate matching of TBs for a first TCI state of a TCI state set and a second TCI state of the TCI state set, and use the bit set and based on the rate matching process, if the rate matching process includes joint rate matching, identify a joint RV for the first TCI state and the second TCI state, or if the rate matching process includes separate rate matching, identify a first RV for the first TCI state and a second RV for the second TCI state.

[0061] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, the set of bits includes a first set of bits, the DCI message also includes an indication of a second set of bits, and the second set of bits is used to determine a rate matching process performed by the base station. In other examples of methods, apparatus, and non-transitory computer-readable media described herein, the set of bits may be used to determine a rate matching process performed by the base station.

[0062] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for selecting between a first lookup table that maps a set of bits to a joint RV and a second lookup table that maps a set of bits to a combination of a first RV and a second RV, wherein the identification may be based on the selection. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first lookup table, the second lookup table, or a combination thereof may be preconfigured in a memory. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a configuration of the first lookup table, the second lookup table, or a combination thereof from a base station.

[0063] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a joint RV or a first RV and a second RV may be identified based on a lookup table that maps a set of bits to one or more RVs. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a lookup table may be pre-configured in a memory. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a configuration of a lookup table from a base station.

[0064] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the rate matching process may include separate rate matching, and the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for using a bit set and based on the rate matching process, in a time slot aggregation process, for each time slot in a time slot set, identifying a first RV for a first TCI state and a second RV for a second TCI state.

[0065] A method for wireless communication is described. The method may include determining to use a TCI state set for transmission to a UE in an FDM multi-TRP scheme, determining a first PRG size for precoding transmissions of a first TCI state of the TCI state set and a second PRG size for precoding transmissions of a second TCI state of the TCI state set based on the FDM multi-TRP scheme, generating bits indicating the first PRG size and the second PRG size based on a first physical resource block (PRB) set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state, and sending a DCI message including an indication of the bit to the UE.

[0066] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to determine to use a TCI state set in an FDM multi-TRP scheme to transmit to a UE, determine a first PRG size for precoding a transmission of a first TCI state of the TCI state set and a second PRG size for precoding a transmission of a second TCI state of the TCI state set based on the FDM multi-TRP scheme, generate bits indicating the first PRG size and the second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state, and send a DCI message including an indication of the bit to the UE.

[0067] Another apparatus for wireless communication is described. The apparatus may include means for determining to use a TCI state set for transmission to a UE in an FDM multi-TRP scheme, determining a first PRG size for precoding transmissions of a first TCI state of the TCI state set and a second PRG size for precoding transmissions of a second TCI state of the TCI state set based on the FDM multi-TRP scheme, generating bits indicating the first PRG size and the second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state, and sending a DCI message including an indication of the bit to the UE.

[0068] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to determine to use a TCI state set for transmission to a UE in an FDM multi-TRP scheme, determine a first PRG size for precoding transmissions of a first TCI state of the TCI state set and a second PRG size for precoding transmissions of a second TCI state of the TCI state set based on the FDM multi-TRP scheme, generate bits indicating the first PRG size and the second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state, and send a DCI message including an indication of the bit to the UE.

[0069] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first PRG size can be a first preconfigured number of PRBs, the number of PRBs in a first PRB set, or a combination thereof, and the second PRG size can be a second preconfigured number of PRBs, the number of PRBs in a second PRB set, or a combination thereof.

[0070] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first PRG size may be the number of PRBs in the first PRB set if the first PRB set is contiguous in frequency, the frequency size of the first PRB set is greater than a threshold frequency size, or a combination thereof, and the second PRG size may be the number of PRBs in the second PRB set if the second PRB set is contiguous in frequency, the frequency size of the second PRB set is greater than a threshold frequency size, or a combination thereof.

[0071] A method for wireless communication at a UE is described. The method may include receiving a DCI message including an indication of a bit from a base station, determining to receive a transmission from the base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state, and using the bit to identify a first PRG size and a second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state.

[0072] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to receive a DCI message including an indication of a bit from a base station, determine to receive a transmission from the base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state, and use the bit to identify a first PRG size and a second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state.

[0073] Another apparatus for wireless communication at a UE is described. The apparatus may include components for: receiving a DCI message including an indication of a bit from a base station; determining to receive a transmission from the base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state; and using the bit to identify a first PRG size and a second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state.

[0074] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to receive a DCI message including an indication of a bit from a base station, determine to receive a transmission from the base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state, and use the bit to identify a first PRG size and a second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state.

[0075] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first PRG size can be a first preconfigured number of PRBs, the number of PRBs in a first PRB set, or a combination thereof, and the second PRG size can be a second preconfigured number of PRBs, the number of PRBs in a second PRB set, or a combination thereof.

[0076] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying a first PRG size and a second PRG size may include operations, features, components, or instructions for: identifying that the first PRG size may be the number of PRBs in the first PRB set if the first PRB set is contiguous in frequency, the frequency size of the first PRB set is greater than a threshold frequency size, or a combination thereof, and identifying that the second PRG size may be the number of PRBs in the second PRB set if the second PRB set is contiguous in frequency, the frequency size of the second PRB set is greater than a threshold frequency size, or a combination thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 and Figure 2 An example of wireless communication supporting dynamic switching between different multiple transmit / receive point (TRP) schemes according to aspects of the present disclosure is shown.

[0078] Figures 3 to 6 An example of a process flow supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown.

[0079] Figure 7 and Figure 8 A block diagram of a device supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown.

[0080] Fig. 9 A block diagram of a multi-TRP manager supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown.

[0081] Fig.10 A diagram of a system including devices supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown.

[0082] Fig.11 and Fig.12 A block diagram of a device supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown.

[0083] Fig.13 A block diagram of a multi-TRP manager supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown.

[0084] Fig.14 A diagram of a system including devices supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown.

[0085] Figures 15 to 22 A flow chart illustrating a method for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0086] In some wireless communication systems, the network may communicate with a user equipment (UE) using one or more transmit / receive points (TRPs). For example, the network may communicate with the UE using a single TRP at a base station, using multiple TRPs at the same base station, or using multiple TRPs across multiple base stations. If the network communicates with the UE using multiple TRPs, the network may configure the UE with a specific multi-TRP scheme from a set of possible schemes for multi-TRP operation. The UE may distinguish which scheme the network uses based on a downlink control information (DCI) message. The base station may send a DCI message on a physical downlink control channel (PDCCH) using a first TRP, and may include a field in the DCI indicating a communication scheme to the UE, parameters of one or more TRPs active in the communication scheme, or a combination thereof. If the base station configures the UE for multi-TRP operation, the network may send to the UE using a first TRP and at least a second TRP (e.g., in multiple physical downlink shared channel (PDSCH) transmissions).

[0087] In a first embodiment, the UE may detect a communication scheme based on the (multi-) antenna port field and the transmission configuration indicator (TCI) field of the DCI message. The TCI field of the DCI may indicate whether the communication is configured to communicate with one TRP or with multiple TRPs. In some cases, the base station may not configure a bit value (e.g., "tci-PresentInDCI") in the TCI field for the control resource set (CORESET) for scheduling PDSCH transmission, or the base station may set the value of the TCI field to indicate a single TCI state. In any of these cases, the UE may be configured with a single TRP scheme for network communication. In other cases, the base station may set the TCI field value to indicate more than one TCI state. In these cases, the UE may be configured with a multi-TRP scheme for network communication. If configured for a single TRP, the UE may determine a set of antenna ports (e.g., demodulation reference signal (DMRS) ports) based on the value of the (multi-) antenna port field of the DCI. If configured for multiple TRPs, the UE may determine a set of antenna ports (e.g., DMRS ports) and a specific multi-TRP scheme from a set of possible schemes. In some examples, the (multi-)antenna port values ​​may correspond to one or more DMRS ports, a communication scheme (e.g., spatial division multiplexing (SDM), frequency division multiplexing (FDM), time division multiplexing (TDM), or any other multiplexing scheme), a rate matching configuration, a configuration of the indicated scheme (e.g., FDM mode, TDM mode, or some other mode), a modulation order, or some combination of these parameters.

[0088] In a second embodiment, the UE may detect a communication scheme based on a multi-TCI scheme field (e.g., containing a "multi-TCI scheme" value) and a TCI field of a DCI message. The base station may set a value in the multi-TCI scheme field to indicate a multi-TRP scheme (e.g., SDM, FDM, or TDM). In some cases, the value may additionally indicate a rate matching configuration, a configuration of the indicated scheme (e.g., FDM mode, TDM mode, etc.), a modulation order, whether time slot aggregation is implemented (e.g., for a TDM scheme), or some combination of these parameters. In a first example, the value of the TCI field may indicate whether the communication scheme includes multiple TCI states. If the TCI field value does not correspond to multiple TCI states, the UE may ignore (e.g., not be used for configuration) the multi-TCI scheme field (e.g., the base station may set the bits in the field to a random value or a default value). In a second example, one or more possible values ​​of the multi-TCI scheme field may correspond to a single TCI state, while other possible values ​​in the multi-TCI scheme field correspond to different multiple TCI state scheme possibilities. The value of the TCI field may be interpreted based on whether the multi-TCI scheme field indicates a single TCI state or multiple TCI states. For example, if the multi-TCI scheme field indicates single-TCI state operation, the TCI field value may correspond to a single TCI state; if the multi-TCI scheme field indicates multi-TCI state operation, the TCI field value may correspond to multiple TCI states.

[0089] Additionally or alternatively, the base station may indicate one or more redundancy versions (RVs) based on rate matching implemented for a multi-TCI scheme. For example, a DCI message may include an RV field. When a single RV is used (e.g., for single TRP operation or when joint rate matching is implemented across TCI states in multi-TRP operation), the RV may be determined by the value in the RV field. When multiple (e.g., two) RVs are used (e.g., when separate rate matching is implemented for multiple TCI states in multi-TRP operation), the base station may indicate multiple RV values ​​in the DCI message. For example, the base station may indicate a first RV value in the RV field of the DCI and a second RV value in the (multi) antenna port field of the DCI, a multi-TCI scheme field of the DCI, or a combination of these fields. Alternatively, if a field of the DCI (e.g., a (multi) antenna port field or a multi-TCI scheme field of the DCI as described herein) indicates separate rate matching for two TCI states, the UE may interpret the value in the RV field in the DCI as corresponding to a pair of RV values. The first RV value in the pair may correspond to a first TCI state, and the second RV value in the pair may correspond to a second TCI state. In other cases, it may be indicated in the RV field whether the rate matching of the TCI state is joint or separate. For example, one or more values ​​of the RV field may correspond to a single RV value (e.g., indicating joint rate matching), and one or more other values ​​of the RV field may correspond to multiple RV values ​​(e.g., indicating separate rate matching).

[0090] In some embodiments, the UE may interpret one or more values ​​in the DCI message differently based on the indicated communication scheme. For example, the UE may determine the precoding resource block group (PRG) size differently based on the scheme. The physical resource block (PRB) bundling size indicator field in the DCI may indicate the PRG size. If the PRB bundling size indicator field indicates a wideband size, the UE may generally determine that the same precoding is used across the entire scheduling bandwidth. However, if the UE determines that the TCI scheme is configured for multi-TCI operation according to an FDM scheme (e.g., based on a (multi) antenna port field, a multi-TCI field, etc.), the UE may interpret the PRB bundling size indicator field to apply to different TCI states, respectively. The UE may determine that the wideband value indicates that the same precoding is used within a resource block (RB) associated with the same TCI state rather than across the entire scheduling bandwidth.

[0091] Certain aspects of the subject matter described herein may be implemented to achieve one or more advantages. The described techniques may support improvements in multiple TRP scheme indications by alleviating signaling overhead and implementing dynamic indications of multiple TRP schemes, among other advantages. Thus, the supported techniques may include improved network operation, and in some examples, may increase network efficiency, among other benefits.

[0092] Aspects of the present disclosure are initially described in the context of wireless communication systems and process flows. Aspects of the present disclosure are further illustrated and described by reference to apparatus diagrams, system diagrams, and flow charts related to dynamic switching between different multi-TRP schemes.

[0093] Figure 1 An example of a wireless communication system 100 that supports dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 can be a long term evolution (LTE) network, an LTE advanced (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, the wireless communication system 100 can support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, or communications with low-cost and low-complexity devices.

[0094] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga-NodeB (any of which may be referred to as a gNB), a home NodeB, a home eNodeB, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro or small cell base stations). The UE 115 described herein is capable of communicating with various types of base stations 105 and network devices including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.

[0095] Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 are supported. Each base station 105 may provide communications coverage for the respective geographic coverage area 110 via a communications link 125, and the communications link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communications link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

[0096] The geographic coverage area 110 of the base station 105 can be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for a macro cell, a small cell, a hotspot, or other types of cells, or various combinations thereof. In some examples, the base station 105 can be mobile, thereby providing communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous LTE / LTE-A / LTE-APro or NR network, in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0097] The term "cell" refers to a logical communication entity for communicating with a base station 105 (e.g., via a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID)) for distinguishing adjacent cells operating via the same or different carriers. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that may provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or other). In some cases, the term "cell" may refer to a portion of a geographic coverage area 110 (e.g., a sector) on which the logical entity operates.

[0098] UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where "device" can also be referred to as a unit, a station, a terminal, or a client. UE 115 can also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 can also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which can be implemented in various items such as household appliances, vehicles, meters, etc.

[0099] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automatic communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application that may utilize or present the information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0100] Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception, but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating over limited bandwidth (e.g., in accordance with narrowband communications). In some cases, UE 115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

[0101] In some cases, UE 115 may also communicate directly with other UE 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). One or more of the group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some cases, the group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0102] The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 via a backhaul link 132 (e.g., via an S1, N2, N3, or other interface). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) via a backhaul link 134 (e.g., via an X2, Xn, or other interface).

[0103] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connections, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobile management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions of the UE 115 served by the base station 105 associated with the EPC, such as mobility, authentication, and bearer management. User IP packets may be transmitted through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, (multiple) intranets, IP multimedia subsystems (IMS), or packet switched (PS) streaming services.

[0104] At least some network devices, such as base stations 105, may include subcomponents such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with UE 115 through several other access network transmission entities, which may be referred to as radio heads, smart radio heads, or (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or integrated into a single network device (e.g., base station 105).

[0105] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region of 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range is approximately 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features. However, these waves can penetrate structures enough to allow macro cells to serve UEs 115 indoors. Transmissions using UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km) than transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum with frequencies less than 300 MHz.

[0106] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using frequency bands from 3 GHz to 30 GHz (also known as the centimeter wave bands). The SHF region includes frequency bands such as the 5 GHz Industrial, Scientific, and Medical (ISM) band, which may be used by devices that can tolerate interference from other users.

[0107] The wireless communication system 100 can also operate in the extremely high frequency (EHF) region (e.g., from 30 GHz to 300 GHz), also known as the millimeter wave band. In some examples, the wireless communication system 100 can support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the extremely high frequency antennas of each device can be smaller and closer than the ultra-high frequency antennas. In some cases, this can facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may be subject to greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The technology disclosed herein can be used across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory agency.

[0108] In some cases, the wireless communication system 100 can utilize licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can adopt license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands such as the 5GHz ISM band. When operating in an unlicensed radio spectrum band, wireless devices such as base stations 105 and UE 115 can use a listen-before-talk (LBT) process to ensure that the channel is clear before sending data. In some cases, operations in unlicensed bands can be based on carrier aggregation configurations and component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in unlicensed spectrum can be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.

[0109] In some examples, the base station 105 or the UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115), wherein the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, multiple signals may be transmitted by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are sent to multiple devices.

[0110] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or direct an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array so that signals propagating in a particular direction relative to the antenna array experience constructive interference and other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying certain amplitude and phase offsets to signals transmitted via each antenna element associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other direction).

[0111] In one example, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. For example, the base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions, which may include signals transmitted according to different beamforming weight sets associated with different transmission directions. The transmission of different beam directions can be used to identify (e.g., by the base station 105 or a receiving device, such as the UE 115) a beam direction for subsequent transmission and / or reception by the base station 105.

[0112] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, the beam direction associated with transmitting along the single beam direction may be determined based at least in part on signals transmitted in different beam directions. For example, UE 115 may receive one or more of the signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality. Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115), or for transmitting signals in a single direction (e.g., for transmitting data to a receiving device).

[0113] A receiving device (e.g., UE 115 may be an example of a millimeter wave receiving device) may try multiple receive beams when receiving various signals from base station 105 (e.g., synchronization signals, reference signals, beam selection signals, or other control signals). For example, the receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may receive along a single beam direction using a single receive beam (e.g., when receiving a data signal). The single receive beam may be aligned in a beam direction determined based on listening according to different receive beam directions (e.g., a beam direction with the highest signal strength, the highest signal-to-noise ratio, or otherwise acceptable signal quality determined based on listening according to multiple beam directions).

[0114] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that may support MIMO operations, or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located on an antenna assembly (e.g., an antenna tower). In some cases, the antennas or antenna arrays associated with a base station 105 may be located in different geographic locations. A base station 105 may have an antenna array with several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Similarly, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0115] In some cases, the wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication at the bearer or packet data aggregation protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate on a logical channel. The medium access control (MAC) layer can perform priority processing and multiplex logical channels into transport channels. The MAC layer can also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the base station 105 or the core network 130 that supports the radio bearer for user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0116] In some cases, UE 115 and base station 105 may support retransmission of data to increase the possibility of successfully receiving data. HARQ feedback is a technique to increase the possibility of correctly receiving data through communication link 125. HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC) and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput of the MAC layer under poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0117] The time interval in LTE or NR can be expressed as a multiple of the basic time unit. For example, the basic time unit can refer to T s=1 / 30720000 second sampling period. The time interval of the communication resources can be organized according to each radio frame having a duration of 10 milliseconds (ms), where the frame period can be represented as T f =307200T s . A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered 0 to 9, and each subframe may have a duration of 1 ms. A subframe may be further divided into 2 slots, each slot having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In addition to the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe, or may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI), or in a component carrier selected using an sTTI).

[0118] In some wireless communication systems, a time slot may be further divided into multiple mini-slots containing one or more symbols. In some cases, a symbol of a mini-slot or a mini-slot may be the minimum unit of scheduling. For example, the duration of each symbol may vary depending on the subcarrier spacing or the operating frequency band. In addition, some wireless communication systems may implement time slot aggregation, where multiple time slots or mini-slots are aggregated and used for communication between UE 115 and base station 105.

[0119] The term "carrier" refers to a collection of radio frequency spectrum resources with a defined physical layer structure for supporting communication over the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency spectrum band that operates according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel raster to be discovered by a UE 115. A carrier may be a downlink or uplink (e.g., in FDD mode), or may be configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted over a carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0120] The organization structure of the carrier may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR). For example, communications on a carrier can be organized based on TTIs or time slots, where each TTI or time slot can include user data and control information or signaling to support decoding of the user data. The carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information) and control signaling to coordinate the operation of the carrier. In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers.

[0121] Physical channels can be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using TDM techniques, FDM techniques, or hybrid TDM-FDM techniques. In some examples, the control information sent in the physical control channel can be distributed between different control regions in a cascaded manner (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

[0122] A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each serviced UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0123] In a system using MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate may be for UE 115. In a MIMO system, wireless communication resources may refer to a combination of radio spectrum resources, time resources, and space resources (e.g., space layers), and the use of multiple space layers may further increase the data rate used to communicate with UE 115.

[0124] A device of the wireless communication system 100 (e.g., a base station 105 or a UE 115) may have a hardware configuration that supports communication on a specific carrier bandwidth, or may be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and / or a UE 115 that supports simultaneous communication via carriers associated with more than one different carrier bandwidths.

[0125] The wireless communication system 100 may support communication with the UE 115 on multiple cells or carriers, a feature which may be referred to as carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both FDD and TDD component carriers.

[0126] In some cases, the wireless communication system 100 can utilize an enhanced component carrier (eCC). An eCC can have one or more characteristics, including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC can be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC can also be configured for unlicensed spectrum or shared spectrum (e.g., allowing more than one operator to use the spectrum). An eCC characterized by a wide carrier bandwidth can include one or more segments that can be used by a UE 115 that is not able to monitor the entire carrier bandwidth or is otherwise configured to use a limited carrier bandwidth (e.g., to save power).

[0127] In some cases, an eCC may use a symbol duration different from that of other component carriers, which may include using a reduced symbol duration compared to the symbol duration of other component carriers. A shorter symbol duration may be associated with an increased spacing between adjacent subcarriers. A device utilizing an eCC, such as a UE 115 or a base station 105, may transmit a wideband signal (e.g., based on a frequency channel or carrier bandwidth of 20, 40, 60, 80 MHz, etc.) at a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may consist of one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

[0128] The wireless communication system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, etc. The flexibility of eCC symbol duration and subcarrier spacing may allow eCC to be used across multiple spectrums. In some examples, NR shared spectrum may improve spectrum utilization and spectrum efficiency, particularly through dynamic vertical (e.g., across frequency domain) and horizontal (e.g., across time domain) resource sharing.

[0129] The wireless communication system 100 may include multiple UEs 115 and multiple base stations 105. The base stations 105 may communicate using TRPs. For example, the network may communicate with the UE 115 using a single TRP at the base station 105, using multiple TRPs at the base station 105, or using multiple TRPs corresponding to multiple base stations 105. In the case where the network communicates with the UE 115 using multiple different TRPs, whether at the same base station 105 or at different base stations 105, the communication may be performed according to one of multiple possible multiple TRP schemes.

[0130] In the first case, the TRPs may communicate by utilizing an FDM scheme. In the case of FDM communication, one RB set or PRG set may correspond to a first TRP and a first TCI state, and a second RB or PRG set may correspond to a second TRP and a second TCI state. The RBs allocated to each TRP may be different from each other so that each TRP communicates on a designated set of RBs that does not overlap in frequency with any other set of RBs allocated to other TRPs in the same OFDM symbol. In the FDM scheme, each TRP may operate using a different TCI state in a single time slot. Different TCI states may use joint or separate rate matching for a transport block (TB) and may have the same or different modulation orders.

[0131] In a second case, the TRP may communicate with the UE 115 by utilizing a TDM scheme. In this case, the TRP may communicate with the UE 115 by sending signaling in different orthogonal frequency division multiplexing (OFDM) symbols. Within a time slot (e.g., a transmit time interval (TTI)) in a TDM scheme, multiple different TCI states may exist in different sets of OFDM symbols within the time slot. Different TCI states corresponding to different TRPs may use joint or separate rate matching for the TBs and may have the same or different modulation orders. In some cases, the TDM scheme may also include a time slot aggregation process, in which case transmissions may be TDMed across time slots so that different TCI states may exist in different time slots. In time slot aggregation, different TRPs may use separate rate matching in different time slots and may use the same or different modulation orders for different TCI states.

[0132] In the third case, the TRPs may communicate using SDM. In this case, different TRPs may transmit different spatial layers on the same RB, symbol, or both. The base station 105 may implement different demodulation reference signal (DMRS) port groups for different TRPs, quasi co-location (QCL) relationships, TCI states, or a combination of these. In some cases, the TRPs may communicate by utilizing code division multiplexing (CDM).

[0133] The network may communicate using multiple TRPs according to any number of communication schemes described herein. In addition, some communication schemes may include a combination of one or more schemes (e.g., both TDM and FDM). In some cases, each multi-TRP scheme may utilize different parameters to configure the scheme (e.g., what DMRS port to use, how to allocate RBs in the FDM scheme, etc.). In order to configure UE 115 to receive information from multiple TRPs, the network may signal the parameters of the selected multi-TRP scheme to UE 115. However, signaling different parameters for different multi-TRP schemes may be inefficient and include significant data overhead or modifications to the configuration transmission. In addition, the network may support UE 115 with different capabilities (e.g., one or more UE 115 may not be configured to perform multi-TRP communications). In these cases, signaling multi-TRP parameters may cause errors at UE 115 that are not configured to decode parameters.

[0134] In order to efficiently support dynamic switching between multiple TRP schemes, the wireless communication system 100 can support the base station 105 to send DCI to configure multiple TRP schemes. For example, the base station 105 can send a single DCI message to the UE 115 to indicate the multiple TRP schemes and the corresponding parameters for multiple TCI states. When indicating a single TRP scheme and a multiple TRP scheme, the base station 105 can use one or more fields in the DCI message differently, so that the DCI message for the UE 115 capable of multiple TRP operation and the DCI message for the UE 115 not capable of multiple TRP operation can have the same payload size. In this way, the UE 115 can receive the DCI message, determine whether a single TCI state or multiple TCI states are configured, and determine the communication parameters indicated in one or more DCI fields based on the number of configured TRPs. Using the DCI message, the base station 105 can dynamically switch between different multiple TRP schemes, and the UE 115 receiving the DCI message can identify these switches and correctly monitor and decode messages from multiple TRPs.

[0135] Figure 2An example of a wireless communication system 200 that supports dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. For example, the wireless communication system 200 can include multiple UEs 115 and base stations 105. The base stations 105 can communicate with the UEs 115 using TRPs 205. Each base station 105 can have one or more TRPs 205. For example, the base station 105-a can include TRP 205-a and TRP 205-b, and the base station 105-b can include TRP 205-c. UE 115-a may communicate with the network using a single TRP 205, using multiple TRPs 205 corresponding to a single base station 105 (e.g., TRPs 205-a and 205-b at base station 105-a), or using multiple TRPs 205 corresponding to multiple different base stations 105 (e.g., TRP 205-a at base station 105-a and TRP 205-c at base station 105-b, where base stations 105-a and 105-b may be connected via a backhaul connection).

[0136] In a communication scheme including multiple TRPs 205, a single DCI message may be configured for communication of multiple TRPs 205. In one example, a base station 105-a may communicate using a first TRP 205-a and a second TRP 205-b. The base station 105-a may send DCI to a UE 115-a using TRP 205-a on a PDCCH 210-a. The DCI may include communication configuration information for a TCI state. The TCI state may determine whether the communication corresponds to a single TRP communication or multiple TRP communications. The TCI state may also indicate the type of communication scheme configured for the communication (e.g., TDM, FDM, or SDM). If the TCI configuration is a TCI state, a TCI state may correspond to a single TRP communication. If the TCI configuration is a plurality of TCI states, a plurality of TCI states may correspond to communications with a plurality of TRPs. In some cases, for the purpose of QCL indication, the wireless communication system 200 may support up to M candidate TCI states. Among these M candidates (e.g., 128 candidate TCI states), a subset of TCI states may be determined based on a MAC control element (CE). A MAC-CE may correspond to a specific number (e.g., 2) of candidate TCI states for PDSCH QCL indication. N , 8 TCI states). N One of the TCI states may be dynamically indicated in a message (eg, DCI) using N bits.

[0137] For a single TRP communication configuration, the DCI on PDCCH 210-a may schedule a PDSCH 215-a transmission from TRP 205-a. Alternatively, the DCI on PDCCH 210-a may schedule multiple PDSCH 215 transmissions from multiple TRPs 205. For example, for multiple TRP communication configurations, the DCI may schedule a PDSCH 215-a transmission from TRP 205-a and a PDSCH 215-b transmission from TRP 205-b, or a PDSCH 215-a transmission from TRP 205-a and a PDSCH 215-c transmission from TRP 205-c. For the purpose of QCL indication, UE 115 may be configured with a list of different candidate TCI states. The QCL indication may also indicate the DMRS in the DCI corresponding to the PDSCH 215. Each TCI code point index in the DCI may correspond to one or more QCL relations (eg, to one or more reference signal (RS) sets) and, accordingly, to one or more TCI states.

[0138] In the case where the network communicates with the UE 115 using the TRP 205, whether in a single TRP configuration or in a multi-TRP configuration, there may be multiple different schemes for communicating with (multiple) TRPs 205. The TRP communication scheme may be determined by the TCI state. The TCI state (s) used to communicate on (multiple) PDSCHs 215 may be indicated in the DCI by one or more bits, wherein the one or more bits indicate a TCI code point index. For example, the UE 115 may store TCI code points, which may be examples of tables containing indexes, each index corresponding to one or more TCI states. The size of the table may be based on the number of bits in the TCI field. For example, if the TCI field includes three bits, the table may have eight indexes (e.g., eight possible bit values ​​corresponding to a three-bit TCI field). In this way, the UE 115 may receive an indication of a TCI state (e.g., an indication of an index), and may determine one or more TCI states based on the corresponding TCI code point index. The TCI code point index in the DCI may correspond to one or more TCI states (e.g., one or two TCI states). If the TCI code point index in the DCI indicates one TCI state, the UE 115 is configured for single TRP operation. If the TCI code point index in the DCI indicates two TCI states (and, accordingly, two QCL relationships), the UE 115 is configured for multi-TRP operation. For example, if two TCI states are active within the TCI code point index, each TCI state may correspond to one CDM group.

[0139] In a first example multi-TRP scheme, TRP 205 can communicate by utilizing SDM. In this case, different spatial layers can be sent from different TRP 205 on the same RB and symbol. Each TCI state can also correspond to a different DMRS port group. The DMRS ports in the DMRS CDM port group can be QCL. This allows UE 115 to estimate each channel separately. In SDM, each antenna port used on the downlink can belong to a different CDM group. Base station 105-a can use the (multi) antenna port field in the DCI to indicate the antenna port group. For example, if the DMRS is a type 1 DMRS, the following example table indicates possible antenna port groups corresponding to the values ​​in the (multi) antenna port field:

[0140]

[0141] Table 1: Example antenna port designations

[0142] The SDM scheme may include different TCI states within a single time slot, where the 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 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 the 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.

[0143] In other examples of multi-TRP schemes, TRP 205 can communicate with UE115-a by utilizing FDM and / or TDM communication schemes. In the FDM scheme, one RB set or PRG set may correspond to the first TRP 205-a and the first TCI state, and the second RB or PRG set may correspond to the second TRP 205-b and the second TCI state. The RBs allocated to each TRP may be different from each other, so that each TRP communicates on a specified RB set different from other RB sets (but may overlap in the same OFDM symbol). The frequency domain resource allocation field in the DCI may indicate both the first set and the second set or the RB or PRG. 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 (e.g., to reduce overhead). The following table includes four example possibilities for how to allocate RBs in the scheduling bandwidth to two TRPs (e.g., TRP205-a and TRP 205-b).

[0144] possibility Segmentation rules 1 Half and Half, Localization 2 Half and Half, Distributed 3 3 / 4–1 / 4, localization 4 3 / 4, 1 / 4, distributed ... ...

[0145] Table 2: Example RB allocation

[0146] In possibility 1, the two TRPs are allocated the same amount of resources, and the resources used for the groups are contiguous in frequency. In possibility 2, the two TRPs are allocated the same amount of resources, and the resources used for the groups are discontinuous in frequency (e.g., interleaved). In possibility 3, one TRP may be allocated a larger proportion of resources than the other TRP, where the resources used for each TRP are contiguous in frequency. In possibility 4, one TRP may be allocated a larger proportion of resources than the other TRP, where the resources used for each TRP may not be contiguous in frequency. Each set of resources allocated to each TRP may be a set of RBs. Different possibility options can reduce the number of bits used to configure the signaling scheme in DC.

[0147] In a TDM scheme, a similar possibility 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 instead of to a different set of RBs. This TDM scheme can support TDM transmissions within a single time slot (e.g., transmission time interval (TTI)). In some cases, the TDM scheme can implement time slot aggregation, where transmissions using different TCI states can be distributed over different time slots (e.g., TTIs). In time slot aggregation, transmissions on different TRPs can use separate rate matching, but can have the same or different modulation orders.

[0148] 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 situations where TDM may or may not be in a time slot aggregation configuration. These schemes may also include some situations where rate matching is joint and some situations where rate matching is separate for different TRPs, and these schemes may also include situations where different TRPs have the same or different modulation orders. For example, a "multi-TRP scheme" may refer to any number of schemes, including but not limited to a joint SDM scheme, a separate SDM scheme, a joint FDM scheme, a separate FDM scheme, a joint TDM scheme, and a separate TDM scheme. In some cases, the joint SDM scheme is referred to as Scheme 1a, the joint FDM scheme is referred to as Scheme 2a, the separate FDM scheme is referred to as Scheme 2b, and the TDM scheme is referred to as Scheme 3 or Scheme 4. Each scheme may also utilize different parameters included in the signaling, such as which DMRS ports are used (e.g., for an SDM scheme) or how the RBs are segmented (e.g., for an FDM scheme).

[0149] In order to efficiently configure UE 115-a with TCI state information and a corresponding TRP scheme, base station 105-a may generate bits for a DCI message and may send the DCI on PDCCH 210-a. The DCI message may be sent to UE 115-a using TRP 205-a. UE 115-a may determine which scheme is configured for communication with TRP 205 based on one or more fields of the received DCI. The DCI may have the same size in all communication schemes, and the format (e.g., number of bits) of the DCI field may remain the same in the communication scheme.

[0150] In a first embodiment, UE 115-a may detect a communication scheme based on the (multiple) antenna port field and the TCI field of a received DCI message. The TCI field of the DCI may indicate whether communication with one TRP using one TCI state is configured (e.g., TRP 205-a) or communication with multiple TRPs using multiple TCI states is configured (e.g., TRP 205-a and TRP 205-b). For example, the value in the TCI field (e.g., tci-PresentInDCI or another value) may not be configured for the CORESET for scheduling the PDSCH, or the value may correspond to one TCI state. The MAC-CE may configure the TCI state possibility, and the TCI state field of the DCI may indicate the possibility based on the configuration of the MAC-CE. In some cases, other signaling (e.g., DCI, RRC, or some other signaling) may configure the TCI state possibility. Different values ​​in the TCI status field may correspond to single TRP communications (e.g., communications with TRP 205-a if a single TCI status is indicated) or multiple TRP communications (e.g., communications with TRPs 205-a and 205-b, 205-a and 205-c, etc. if two TCI statuses are indicated).

[0151] UE 115-a can determine whether the DCI indicates a single TRP communication scheme or a multiple TRP communication scheme based on the value in the TCI field, and can interpret the value in the (multi) antenna port field of the DCI based on the TCI field value. In the case where the TCI field corresponds to a communication scheme with a single TRP 205 (e.g., TRP 205-a), UE 115-a can identify the value of the (multi) antenna port field of the single TCI state. Based on the table in the memory, UE 115-a can determine one or more antenna ports for scheduled PDSCH 215-a transmission based on the (multi) antenna port field value. In the case where the TCI field corresponds to a communication scheme with multiple TRPs 205 (e.g., TRP 205-a and TRP 205-b), UE 115-a can identify the value of the (multi) antenna port field and determine the multiple TRP scheme based on the value. In one example, the (multi) antenna port field value may correspond to one or more DMRS ports, communication schemes, rate matching configurations, scheme-specific parameters, or some combination of these, as shown in the following table. In some examples, the likelihood column of this table may correspond to the likelihood table above, depicting different RB partitions for the FDM scheme.

[0152] value DMRS Port plan Rate Matching possibility 0 {0}，{2} SDM joint N / A 1 {0}，{2} SDM alone N / A 2 {0，1}，{2} SDM joint N / A 3 {0，1}，{2} SDM alone N / A 4 {0，1}，{2，3} SDM joint N / A 5 {0，1}，{2，3} SDM alone N / A 6 0 FDM joint RB Split 1 7 0 FDM alone RB Split 1 8 0 FDM joint RB Split 2 9 0 FDM alone RB Split 2 10 0，1 FDM joint RB Split 1 11 0，1 FDM alone RB Split 1 12 0，1 FDM joint RB split 3 13 0，1 FDM alone RB split 3 ... ... ... ... ...

[0153] Table 3: Example (multiple) antenna port table

[0154] The table of (multi) antenna port field values ​​for explaining single TRP operation and multi-TRP operation can support the same number of values. In this way, the (multi) antenna port field size in the DCI can be constant across schemes (e.g., four bits).

[0155] In a second embodiment, UE 115-a may determine the communication scheme based on a field (e.g., a multi-TCI scheme field) that explicitly indicates the scheme in the DCI message. The value in the multi-TCI scheme field may correspond to a specific multi-TCI scheme (e.g., SDM, FDM, or TDM). If the value in the multi-TCI scheme field corresponds to a TDM scheme, the value may further indicate whether the TDM scheme is configured for one time slot or multiple time slots based on the time slot aggregation process.

[0156] In one example, UE 115-a may identify a value of a TCI field in a DCI message and may determine whether a communication scheme includes multiple TCI states based on the TCI field value. If the value does not correspond to multiple TCI states, UE 115-a may ignore (e.g., not process) the Multiple TCI Scheme field. In some cases, where the TCI field in the DCI corresponds to more than one TCI state, the value of the Multiple TCI Scheme field may be relevant.

[0157] In a second example, UE 115-a may determine whether a communication scheme includes multiple TCI states based on a multi-TCI scheme field. For example, a specific value of the multi-TCI scheme field may correspond to a single TCI state. In this example, the value of the multi-TCI scheme field corresponding to the TCI state may be considered to represent a single TRP scheme. At the same time, other values ​​of the multi-TCI scheme field may correspond to different multi-TCI scheme possibilities. UE 115-a may interpret the TCI field based on whether the multi-TCI scheme field indicates a single TRP operation or a multi-TRP operation. For example, based on whether the multi-TCI scheme field indicates a single TRP operation or a multi-TRP operation, the same TCI code point index in the TCI field may correspond to one TCI state or a pair of TCI states. In this way, a three-bit TCI field may support eight different single TCI state options and eight different multiple TCI state option pairs.

[0158] UE 115-a may interpret the value received in the Multi-TCI Scheme field based on the table. For example, the value may indicate a specific TRP communication scheme, a rate matching configuration, one or more scheme-specific parameters, a modulation order, or any combination of these. An example table is shown below:

[0159]

[0160]

[0161] Table 4: Example multi-TCI scheme table

[0162] In some cases, different modulation orders are used for different TCI states. The above table may include an additional or alternative column indicating the modulation order of the second TCI state in the multi-TCI scheme. The modulation order value may be an absolute modulation order, or may be a relative modulation order relative to the modulation order of the first TCI state in the multi-TCI scheme.

[0163] In some cases, UE 115-a may interpret the (multiple) antenna port field in the DCI message based on the multi-TCI scheme field. In some examples, UE 115-a may determine to use a single TRP configuration based on these two fields, or to use a multi-TRP configuration utilizing TDM or FDM. In these examples, UE 115-a may determine the antenna port scheme based on a table supporting a single TCI state (or based on no SDM). In other examples, UE 115-a may determine to use a multi-TRP configuration utilizing SDM. In these other examples, UE 115-a may determine the antenna port scheme based on a table supporting multiple antenna ports for multiple TCI states.

[0164] In other cases, UE 115-a may use the (multi-) antenna port field and the multi-TCI scheme field to determine the communication scheme. For example, UE 115-a may determine whether the multi-TCI scheme is an SDM scheme based on the (multi-) antenna port field. If not, UE 115-a may determine whether the multi-TCI scheme is an FDM scheme or a TDM scheme based on the multi-TCI scheme field.

[0165] In a third embodiment, the UE 115-a may determine the RV for PDSCH 215 transmission based on the DCI. For example, the base station 105-a may identify a transport block for transmission to the UE 115-a. The base station 105-a may encode the transport block and send the coded bits using TRP205-a and TRP 205-b. If the base station 105-a performs joint rate matching, the coded bits for the two TCI states may be the same, corresponding to one RV. If the base station 105-a performs separate rate matching, the coded bits for each TCI state may be different, corresponding to two different RVs. The base station 105-a may indicate one or more RVs in a single DCI message on the PDCCH 210-a. If one RV is indicated (e.g., for a single TCI operation or when performing joint rate matching), the base station 105-a may indicate the one RV in the RV field in the DCI. If multiple (e.g., two) RVs are indicated, the base station 105-a may indicate a pair of RVs in one or more DCI fields.

[0166] In a first example, the first RV may be indicated in the RV field of the DCI, and the second RV may be indicated in another field of the DCI. For example, the second RV may be indicated in the (multiple) antenna port field of the DCI, the multi-TCI scheme field of the DCI, or some combination of these.

[0167] In a second example, a (multiple) antenna port field or a multi-TCI scheme field of a DCI as described herein may indicate a rate matching configuration. If UE 115-a determines that base station 105-a performs separate rate matching, UE 115-a may interpret the value in the RV field to indicate separate RV values ​​for different TCI states. For example, the value of the RV field may correspond to an RV pair, wherein the first RV value in the pair may correspond to a first TCI state, and the second RV value in the pair may correspond to a second TCI state. The correspondence between the value and the RV pair may be specified in a table (e.g., a lookup table). The table may be pre-configured in a memory at UE 115-a and base station 105-a, or the network may configure UE 115-a with the table.

[0168] The value of the RV field RV Pair 0 (0，0) 1 (0，2) 2 (2，0) 3 (0，3)

[0169] Table 5: Example RV pair indications

[0170] In a third example, the rate matching configuration may also be indicated in the RV field. For example, the value of the RV field may correspond to a single RV or multiple RVs, as shown in the example RV table below. In some cases, UE 115-a may use the table to interpret the RV field when determining that a multi-TRP scheme is configured. The table may be specified as a lookup table and may be pre-configured or dynamically configured by the network. If the value of the RV field corresponds to a single RV value for multi-TRP operation, UE 115-a may determine that base station 105-a is performing joint rate matching. For example, joint rate matching may involve an RV corresponding to a codeword. If the value of the RV field corresponds to a pair of RV values ​​for multi-TRP operation, UE 115-a may determine that base station 105-a is performing separate rate matching. For example, separate rate matching may involve two RVs corresponding to two codewords (e.g., where the first RV of the RV pair corresponds to the first codeword and the second RV of the RV pair corresponds to the second separate codeword). In some cases, the values ​​of the RVs may be the same or different.

[0171] The value of the RV field RV 0 0 1 2 2 (0，0) 3 (0，2)

[0172] Table 6: Example joint / separate rate matching indication using RV field

[0173] In a fourth embodiment, UE 115-a may determine how to interpret the indication of the PRG size in the DCI based on the configured multi-TCI scheme. If UE 115-a determines that the multi-TCI scheme is an FDM scheme (e.g., based on the (multi) antenna port field or the multi-TCI field), UE 115-a may interpret the PRB bundling size indicator field in the DCI per TCI state rather than per bandwidth part. For example, if the PRB bundling size indicator field indicates wideband precoding, the wideband precoding configuration may include wideband communication within RBs associated with the same TCI state.

[0174] It should be understood that the wireless communication system 200 may implement any combination of the embodiments described herein to dynamically signal the TCI status of a selected multi-TRP scheme in a single DCI message.

[0175] Figure 3 An example of a process flow 300 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. In some examples, the process flow 300 can implement aspects of the wireless communication system 100 or 200. For example, a base station 105 and a UE 115, such as a base station 105-c and a UE 115-b, can perform one or more processes described with reference to the process flow 300. The base station 105-c can communicate with the UE 115-b by sending and receiving signals via TRPs 305-a and 305-b. In other cases, TRPs 305-a and 305-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, the steps may include additional features not mentioned below, or further steps may be added.

[0176] At 310, the base station 105-c may generate a DCI. The generation may include generating a first set of bits (e.g., a TCI field) that may indicate a set of TCI states for communicating with the UE 115-b. In some cases, the first set of bits may be included in a TCI field of the DCI, or a different field of the DCI, or a different message. The generation may also include generating a second set of bits (e.g., a (multi) antenna port field) that may indicate an antenna port set and, in some cases, may indicate a multi-TRP communication scheme for multi-TRP communication operations. In some cases, the second set of bits may be included in an antenna port field of the DCI, or a different field of the DCI, or a different message. In some cases, the second set of bits may additionally indicate a modulation order for at least one TCI state (e.g., a second TCI state for TRP 305-b), an RV of a TB for at least one TCI state (e.g., a second TCI state for TRP 305-b), or a combination thereof.

[0177] At 315, base station 105-c may send the generated DCI to UE 115-b. UE 115-b may receive the DCI from base station 105-c. The DCI may be transmitted on the PDCCH from TRP 305-a. The DCI may schedule an upcoming PDSCH transmission and may include other control information. The DCI may include an indication of the first set of bits and the second set of bits. For example, the DCI may include coded bits based on the first set of bits and the second set of bits.

[0178] At 320, the UE 115-b may read the TCI field (e.g., 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 305.

[0179] At 325, 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 (e.g., tci-PresentInDCI) may not be configured for the CORESET that schedules the 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 to communicate with multiple TRPs.

[0180] UE 115-b may read the (multi-) antenna ports 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 to be used for PDSCH transmission. In some cases, at 330, UE 115-b may access a lookup table (e.g., pre-configured in a memory or configured by the network) to determine one or more antenna ports corresponding to the (multi-) antenna ports field value.

[0181] 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, 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 330, UE 115-b may access a lookup table to determine the antenna port set and the multi-TRP scheme based on the (multi) antenna port field value. In some cases, UE 115-b may select a lookup table from a lookup table set, where the set may include a lookup table for single TRP operation and a lookup table for multi-TRP operation. An example lookup table is shown below.

[0182] value DMRS Port plan RM possibility 0 {0}，{2} SDM joint N / A 1 {0}，{2} SDM alone N / A 2 {0，1}，{2} SDM joint N / A 3 {0，1}，{2} SDM alone N / A 4 {0，1}，{2，3} SDM joint N / A 5 {0，1}，{2，3} SDM alone N / A 6 0 FDM joint RB Split 1 7 0 FDM alone RB Split 1 8 0 FDM joint RB Split 2 9 0 FDM alone RB Split 2 10 0，1 FDM joint RB Split 1 11 0，1 FDM alone RB Split 1 12 0，1 FDM joint RB split 3 13 0，1 FDM alone RB split 3 ... ... ... ... ...

[0183] Table 3: Example (multiple) antenna port table

[0184] The lookup table may include information that maps both the antenna port set and the multi-TRP scheme to a second set of bits. In some cases, a lookup table that maps both the antenna port set and the multi-TRP communication scheme to a second set of bits may be preconfigured in a memory, and in some cases, the lookup table 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, together with an indication of a DMRS port, the table may include an indication of a multi-TRP scheme (e.g., SDM, FDM, TDM, or some combination thereof). The (multi) antenna port field lookup table may indicate that the value in the (multi) 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 (multi) antenna port field value may also indicate whether the rate matching is joint or separate. If the (multi) antenna port field value indicates that an FDM communication scheme is used, the table may additionally indicate an RB configuration of the (FDMed) 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 RRC signaling to define the set of possible DMRS ports and the type of scheme.

[0185] In the case of single TRP communication, UE 115-b may interpret the (multi-)antenna port field using a table that maps to one or more antenna ports, as shown below:

[0186]

[0187] Table 7: Example (multiple) antenna port table for a single codeword

[0188] In some cases, UE 115-b can select between this table and a table indicating multiple TRP schemes based on the TCI field value.

[0189] In some cases, UE 115-b may use a second bit set to identify the modulation order of 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. The first modulation order may correspond to a first TCI state in a multi-TRP operation. A second modulation order may be indicated in one of the above tables based on a received value of the (multi) antenna port field. For example, a column in the (multi) 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 of the first TCI state). If the modulation order is different from the modulation order indicated in the MCS, the value of the modulation order of the second TCI state may be indicated in the (multi) 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.

[0190] 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 305-a at 335. The UE 115-b may communicate with the single TRP 305-a based on the determined communication scheme.

[0191] If the TCI state configuration is determined to indicate communication with multiple TRPs 305, the UE 115-b can receive a transmission from one TRP 305-a at 335 and can also receive a transmission from another TRP 305-b at 340 (where, in some cases, 335 and 340 can correspond to the same time or OFDM symbol). The UE 115-b can communicate with the network via multiple configured TRPs 305 based on the determined communication scheme.

[0192] Figure 4An example of a process flow 400 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. In some examples, the process flow 400 can implement aspects of the wireless communication system 100 or 200. For example, a base station 105 and a UE 115, such as a base station 105-d and a UE 115-c, can perform one or more processes described with reference to the process flow 400. The base station 105-d can communicate with the UE 115-c by sending 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, the steps may include additional features not mentioned below, or further steps may be added.

[0193] UE 115-c can determine whether the communication is configured for single TRP communication or multiple TRP communication based on the TCI status field in the DCI. In one example, the value of the multiple TCI status field can determine that the communication scheme includes multiple TCI states, and if the value does not correspond to multiple TCI states, the multiple TCI status field can be ignored because the value can determine that the communication system is configured for communication with a single TRP. In this example, in the case where the TCI field in the DCI corresponds to more than one TCI state, the value of the new field can be relevant. In a second example, one of the possible values ​​of the multiple TCI scheme field may correspond to a single TCI state (corresponding to communication with a single TRP), and other values ​​may correspond to different multiple TCI states (corresponding to communication with multiple TRPs).

[0194] In some cases, at 410, the UE 115-c may send an indication of its configuration and / or capabilities to the base station 105-d. The signal may be sent via the TRP 405-a. The base station 105-d may receive the indication of the capabilities of the UE 115-c. The UE 115-c may indicate whether the UE 115-c is configured for or capable of multi-TRP operation. At 415, the base station 105-d may determine that the UE 115-c is configured for multi-TRP communication and operation (e.g., based on the capabilities of the UE 115-c).

[0195] At 420, the base station 105-d may generate a DCI. The generation of the DCI may include generating a first bit set (e.g., a TCI field) indicating one or more TCI states for communicating with the UE 115-c. The generation of the DCI may also include generating a second bit set (e.g., a multi-TCI scheme field) based on the UE 115-c being configured for multi-TRP operation. In some cases, a UE 115 that is not configured for multi-TRP operation may not be configured to process the multi-TCI scheme field. In some cases, when the UE 115-c is configured for multi-TCI transmission, the field may be present in a non-fallback DCI, and the field may not be present in one or more other forms of DCI. The second bit set may indicate a multi-TRP communication scheme for multi-TRP operation, or may indicate a single TRP scheme. The generation of the second bit set may include determining that the configuration is for multiple TCI states (e.g., as opposed to a single TCI state configuration). The generation of the second bit set may include identifying the second bit set based on a lookup table that maps the multi-TRP scheme for the TCI state to the second bit set. In some cases, the second set of bits may be generated based on whether the first set of bits indicates one TCI state or multiple TCI states. In other cases, the first set of bits may be generated based on whether the second set of bits indicates a multi-TRP scheme or a single TRP scheme. Base station 105-d may configure a lookup table for interpreting the multi-TCI scheme field and may send the lookup table to UE115-c via TRP 405-a.

[0196] At 425, the base station 105-d may send a DCI message to the UE 115-c using the TRP 405-a. The DCI may be sent by the TRP 405-a in the PDCCH. The UE 115-c may receive the DCI message from the base station 105-d. The UE 115-c may use a first set of bits to identify one or more TCI states for communicating with the base station 105-d. The one or more TCI states may include a single TCI state or multiple TCI states.

[0197] At 430, the UE 115-c may detect the presence of a multi-TCI scheme field in the DCI. At 435, the UE 115-c may read the multi-TCI scheme field of the DCI. The UE 115-c may use a second bit set and based on the UE 115-c being configured for multi-TRP operation, identify a multi-TRP scheme for multi-TRP operation or a single TRP scheme for single TRP operation. In some cases, the UE 115-c may identify that the multi-TRP scheme is an SDM multi-TRP scheme. The DCI message may include a third bit set (e.g., a (multi) antenna port field) indicating an antenna port set used to communicate with the UE 115-c. A first antenna port set of the antenna port set may correspond to a first TCI state of a TCI state set, and a second antenna port set of the antenna port set may correspond to a second TCI state of a set of possible TCI states. In some cases, both the (multi) antenna port field and the multi-TCI scheme field may be used to determine a communication scheme for multi-TRP operation.

[0198] At 440, the UE 115-c may determine a communication scheme based on a multi-TCI scheme field of the DCI. In one example, a multi-TRP scheme or a single TRP scheme may be identified based on whether a first bit set indicates one TCI state or a different set of TCI states. In a second example, the multi-TRP scheme field may indicate a multi-TRP scheme or a single TRP scheme operation, and the TCI field (e.g., the first bit set) may be interpreted based on whether a single TRP or multiple TRPs are indicated in a second bit set. In some cases, the UE 115-c may also use the second bit set to identify a modulation order for at least one TCI state in a set of possible TCI states. Additionally or alternatively, the UE 115-c may use the second bit set to identify an RV of a transport block for at least one TCI state in a set of possible TCI states.

[0199] At 445, the UE 115-c may access a lookup table (e.g., the lookup table shown below) to determine the communication scheme based on the determined value in the multi-TCI scheme field of the DCI. The lookup table may be preconfigured in a memory or may be sent to the UE 115-c by the base station 105-d after being configured at the base station 105-d.

[0200] Values ​​in the DCI field plan RM possibility 0 SDM joint N / A 1 SDM alone N / A 2 FDM joint RB Split 1 3 FDM alone RB Split 1 4 FDM joint RB Split 2 5 FDM alone RB Split 2 6 FDM joint RB split 3 7 FDM alone RB split 3 8 TDM (within one time slot) joint equal 9 TDM (within one time slot) alone equal 10 TDM (Time Slot Aggregation) N / A 2 repetitions 11 TDM (Time Slot Aggregation) N / A 3 repetitions 12 TDM (Time Slot Aggregation) N / A 4 repetitions ... ... ... ...

[0201] Table 4: Example multi-TCI scheme table

[0202] If UE 115-c determines that the system is configured for single-TRP communication, then at 450, UE 115-c may receive PDSCH transmissions from a single TRP 405-a. If UE 115-c determines that the system is configured for multi-TRP communication, then at 450, UE 115-c may receive PDSCH transmissions from TRP 405-a and, at 455, may also receive PDSCH transmissions from TRP 405-b.

[0203] Figure 5 An example of a process flow 500 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. In some examples, the process flow 500 may implement aspects of the wireless communication system 100 or 200. For example, a base station 105 and a UE 115, such as a base station 105-e and a UE 115-d, may perform one or more processes described with reference to the process flow 500. The base station 105-e may communicate with the UE 115-d by sending and receiving signals via TRPs 505-a and 505-b. In other cases, the TRPs 505-a and 505-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, the steps may include additional features not mentioned below, or further steps may be added. In some cases, the reference Figure 5 One or more of the processes described may be combined with reference to Figure 3 , Figure 4 or a combination thereof.

[0204] At 510, the base station 105-e may determine a rate matching configuration. The base station 105-e may use the set of TCI states to determine transmission to the UE 115-d. The communication may include performing a rate matching process, which may involve joint rate matching or separate rate matching for the TB. In joint rate matching, the base station 105-e may generate the same coded bits for transmission for multiple TCI states based on the TB. In separate rate matching, the base station 105-e may generate coded bits for transmission for each TCI state separately for the TB. Therefore, for two TCI states, joint rate matching may result in a single RV, while separate rate matching may result in two RVs (one for each TCI state).

[0205] At 515, the base station 105-e may generate a DCI. The base station 105-e may generate a set of bits based on a rate matching process, wherein the set of bits indicates a joint RV or separate RVs for the first and second TCI states, a first RV corresponding to the first TCI state, and a second RV corresponding to the second TCI state. In some cases, the base station 105-e may configure one or more lookup tables for the UE 115-d for interpreting the RV field in the DCI message. In other cases, one or more lookup tables may be preconfigured in the memory of the base station 105-e and the UE 115-d. The base station 105-e may generate a set of bits based on a lookup table that maps one or more RVs to a set of bits.

[0206] At 520, the base station 105-e may send a DCI message to the UE 115-d (e.g., using the TRP 505-a). The DCI may include an RV field. The UE 115-d may receive the DCI message from the base station 105-d. In some cases, the DCI may additionally include a second set of bits that indicate whether the rate matching process involves joint rate matching or separate rate matching.

[0207] At 525, UE 115-d may determine a rate matching configuration for the communication system based on the DCI. UE 115-d may determine whether rate matching is joint or individual. In some cases, base station 105-e may perform a timeslot aggregation process on a set of timeslots. If base station 105-e performs individual rate matching, a bit set (e.g., an RV field) may further indicate RVs for different timeslots and / or different TCI states.

[0208] At 530, the UE 115-d may read the RV field of the DCI. At 535, the UE 115-d may access one or more lookup tables. The UE 115-d may select between a first lookup table and a second lookup table. The first lookup table may map the RV field value to a single RV (e.g., for joint rate matching), and the second lookup table may map the RV field value to a combination of the first RV and the second RV (e.g., for separate rate matching). The first lookup table and the second lookup table may be pre-configured in a memory or configured by a network.

[0209] Based on the RV field, the UE 115-d may determine a first RV (e.g., corresponding to a first TCI state). At 540, if the base station 105-e implements separate rate matching, the UE 115-d may determine a second RV. The second RV may be determined based on the RV field or another field in the DCI.

[0210] In cases where rate matching is separate for different TCI states, in some cases, a first RV may be indicated in the RV field of the DCI, and a second RV may be signaled in the (multi-)antenna port field of the DCI, the multi-TCI scheme field of the DCI, or some combination of these fields. In these cases, the UE 115-d may read the RV field of the DCI at 520 to determine the first RV, and the UE 115-d may read the (multi-)antenna port field or the multi-TCI scheme field at 525 to determine the second RV. The UE 115-d may successfully receive the scheduled PDSCH transmissions from the multiple TRPs 505-a and 505b at 550 using the determined RV.

[0211] Alternatively, a field in the DCI (e.g., a (multi) antenna port field or a multi-TCI scheme field of the DCI as described herein) may indicate a configuration for separate rate matching and, accordingly, indicate different RVs for different TCI states. In this case, the UE 115-d may read the RV field in the DCI at 520. The UE 115-d may determine an RV pair corresponding to the RV field value (e.g., as shown in the example table below), wherein the first RV value of the pair may correspond to a first TCI state and the second RV value of the pair may correspond to a second TCI state. The table may be specified as a lookup table or may be configured by the network. The UE 115-d may select the table when identifying separate rate matching for multiple TRPs and may alternatively select a table that maps each RV field value to a single RV when identifying a single or joint rate matching.

[0212] The value of the RV field RV Pair 0 (0，0) 1 (0，2) 2 (2，0) 3 (0，3)

[0213] Table 5: Example RV pair indications

[0214] In some cases, the UE 115-b may interpret the RV field value after the UE 115-b determines that the configured multi-TCI scheme is a TDM timeslot aggregation scheme. The UE 115-b may determine the number of repetitions (e.g., the number of timeslots or TTIs used for timeslot aggregation) and may interpret the RV field based on the determination. In the case where timeslot aggregation is used and there are three repetitions, the UE 115-b may interpret the RV field based on the following table, for example, where i corresponds to a first TCI state and j corresponds to a second TCI state.

[0215]

[0216] Table 8: Example RV table for three replicates

[0217] In another example, where slot aggregation is used and there are four repetitions, UE 115-b may interpret the RV field based on the following table.

[0218]

[0219] Table 9: Example RV table for four replicates

[0220] In other cases, whether the rate matching is joint or separate may also be indicated in the RV field (e.g., rather than as part of the (multi) antenna port field or the multi-TCI scheme field). In these cases, the UE 115-d may read the RV field of the DCI at 520 and may access a lookup table (e.g., the lookup table shown below) at 535 to determine the rate matching. For example, different RV field values ​​may correspond to one RV or multiple RVs. For the table shown below, an RV field value of 0 or 1 may correspond to single or joint rate matching, while an RV field value of 2 or 3 may correspond to separate rate matching for two TCI states. The table may be specified as a lookup table or may be configured by the network.

[0221] The value of the RV field RV 0 0 1 2 2 (0，0) 3 (0，2)

[0222] Table 6: Example joint / separate rate matching indication using RV field

[0223] Once UE 115-d determines the RVs, UE 115-d may receive PDSCH transmissions from the network based on these RVs. For example, UE 115-d may receive a first PDSCH transmission corresponding to a first RV from TRP 505-a at 545, and may receive a second PDSCH transmission corresponding to the same RV or a second RV from TRP 505-b at 550.

[0224] Figure 6 An example of a process flow 600 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. In some examples, the process flow 600 may implement aspects of the wireless communication system 100 or 200. For example, a base station 105 and a UE 115, such as a base station 105-f and a UE 115-e, may perform one or more processes described with reference to the process flow 600. The base station 105-f may communicate with the UE 115-e by sending and receiving signals via TRPs 605-a and 605-b. In other cases, the TRPs 605-a and 605-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, the steps may include additional features not mentioned below, or further steps may be added. In some cases, the reference Figure 6 One or more of the processes described may be combined with reference to Figure 3 , Figure 4 , Figure 5or a combination thereof.

[0225] At 610, the base station 105-f may determine a PRB bundling scheme. The PRBs may be bundled into a PRG, where the PRG determines a unit of consecutive RBs on which the base station 105-f uses the same precoding. In some cases, the UE 115-e or the base station 105-f may use the PRG as a unit for joint channel estimation. In some embodiments, the PRG size may be one of a set of values ​​(e.g., 2RBs, 4RBs, or wideband). In some cases, the PRG size is semi-statically indicated by RRC signaling. In other cases, the base station 105-f may dynamically signal the PRG size using a PRB bundling size indicator field in the DCI (e.g., if a higher layer parameter "prb-BundlingType" is set to "dynamic"). The PRB bundling size indicator field may include one bit. The base station 105-f may set the value of the bit to indicate whether bundleSizeSet1 or bundleSizeSet2 is used. BundleSizeSet1 and bundleSizeSet2 may be higher layer parameters that configure two sets of PRG values, where the first set may adopt one or two PRG sizes (e.g., from 2 RBs, 4 RBs, or wideband) and the second set may adopt one PRG size (e.g., from 2 RBs, 4 RBs, or wideband).

[0226] The "wideband" PRG size may be applied to all RBs in the scheduled bandwidth portion for transmission. However, this definition of broadband may not be relevant in the case of using an FDM multi-TRP scheme, because the bandwidth portion may be split between multiple TCI states. If the UE 115-e determines that a multi-TCI state FDM scheme is configured by the base station 105-f, the UE 115-e may interpret the PRB bundle size indicator field of the DCI differently from other communication schemes. Based on the FDM scheme, the UE 115-e may determine that if the PRB bundle size indicator field corresponds to a broadband configuration, the broadband across the scheduled bandwidth portion is not applicable. On the contrary, if the PRB bundle size indicator field corresponds to a broadband configuration, the broadband configuration is applicable within the PRB associated with each specific TCI state. That is, the same precoding may be assumed for the PRB corresponding to the first TCI state rather than for the PRB corresponding to the second TCI state. This may be applicable when the scheduled PRBs corresponding to the TCI state are continuous in frequency and the size of the scheduled PRBs corresponding to the TCI state meets the threshold size. For example, the threshold may be one-quarter of the size of the scheduled bandwidth portion.

[0227] As shown, the base station 105-f can configure the DCI for transmission via TRP 605-a. For example, the base station 105-f can set the PRB bundling size indicator field in the DCI message based on the precoding performed at the base station 105-f. At 615, the base station 105-f can use TRP 605-a to send the DCI message to the UE 115-e. In some cases, the base station 105-f can determine to use the TCI state set in the FDM multi-TRP scheme to send to the UE 115-e. The base station 105-f can determine the first PRG size for precoding the transmission of the first TCI state of the TCI state set and the second PRG size for precoding the transmission of the second TCI state of the TCI state set based on the FDM multi-TRP scheme. The base station 105-f can generate bits (e.g., PRB bundling size indicator fields) indicating the first PRG size and the second PRG size. The DCI transmission at 615 may include an indication of a bit. In some cases, the first PRG size may be a first preconfigured number of PRBs (e.g., 2 or 4) or the number of PRBs in a first PRB set (e.g., for a wide band within an RB for a first TCI state). The second PRG size may include a second preconfigured number of PRBs (e.g., 2 or 4) or the number of PRBs in a second PRB set (e.g., for a wide band within an RB for a second TCI state).

[0228] At 620, the UE 115-e may determine the use of the FDM communication scheme. For example, the UE 115-e may determine the FDM multi-TRP scheme by examining the TCI field and the (multi-)antenna port field of the DCI or by examining the multi-TCI scheme field.

[0229] At 625, the UE 115-e may read the PRG field of the DCI. Based on reading the PRG field, the UE 115-e may determine the PRB bundling size at 630. If the first PRB set is contiguous in frequency and if the frequency size of the first PRB set is greater than a threshold frequency size (e.g., one-fourth the size of the scheduled bandwidth portion, one-half the size of the scheduled bandwidth portion, etc.), the first PRG size may be the number of PRBs in the first PRB set (e.g., wideband within an RB for a first TCI state). If the second PRB set is contiguous in frequency and if the frequency size of the second PRB set is greater than a threshold frequency size, the second PRG size may be the number of PRBs in the second PRB set (e.g., wideband within an RB for a second TCI state).

[0230] Figure 7A block diagram 700 of a device 705 supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The device 705 can be an example of aspects of the UE 115 as described herein. The device 705 can include a receiver 710, a multi-TRP manager 715, and a transmitter 720. The device 705 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0231] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to dynamic switching between different multi-TRP schemes). The information may be passed to other components of the device 705. The receiver 710 may be a reference Fig.10 Examples of aspects of the transceiver 1020 are described. The receiver 710 may utilize a single antenna or a collection of antennas.

[0232] In some embodiments, the multi-TRP manager 715 may receive a DCI message including an indication of a first bit set and a second bit set from a base station, use the first bit set to identify a TCI state set for communicating with the base station, and use the second bit set to identify an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based on identifying the TCI state set.

[0233] In other embodiments, the multi-TRP manager 715 may receive a DCI message including an indication of a first bit set and a second bit set from a base station, identify one or more TCI states for communicating with the base station using the first bit set, and identify a multi-TRP scheme from a set of possible schemes for multi-TRP operation or identify a single TRP scheme for single TRP operation using the second bit set and based on the UE (e.g., device 705) being configured for multi-TRP operation.

[0234] Additionally or alternatively, the multi-TRP manager 715 may receive a DCI message including an indication of a bit set from a base station; determine a rate matching process performed by the base station, wherein the rate matching process includes joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set; and using the bit set and based on the rate matching process, if the rate matching process includes joint rate matching, identify a joint RV for the first TCI state and the second TCI state, or if the rate matching process includes separate rate matching, identify a first RV for the first TCI state and a second RV for the second TCI state.

[0235] Additionally or alternatively, the multi-TRP manager 715 may receive a DCI message including an indication of a bit from a base station; determine to receive a transmission from the base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state; and use the bit to identify a first PRG size and a second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state. The multi-TRP manager 715 may be an example of aspects of the multi-TRP manager 1010 described herein.

[0236] The multi-TRP manager 715 or its subcomponents may be implemented by hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the multi-TRP manager 715 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0237] The multi-TRP manager 715 or its subcomponents can be physically located in various locations, including being distributed so that parts of the functionality are implemented by one or more physical components at different physical locations. In some examples, the multi-TRP manager 715 or its subcomponents can be independent and different components according to various aspects of the present disclosure. In some examples, the multi-TRP manager 715 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof according to various aspects of the present disclosure.

[0238] Transmitter 720 can transmit signals generated by other components of device 705. In some examples, transmitter 720 can be co-located with receiver 710 in a transceiver module. For example, transmitter 720 can be a reference Fig.10 Examples of aspects of the transceiver 1020 are described. The transmitter 720 may utilize a single antenna or a collection of antennas.

[0239] The multi-TRP manager 715 as described herein may be implemented to achieve one or more potential advantages. One embodiment may allow the device 705 to efficiently coordinate communications between a set of TRPs and the device 705, and more specifically indicate a multi-TRP scheme for communications between a TRP and the device 705. For example, the device 705 may identify a scheme for multi-TRP operation based on identifying a TCI state in a DCI message.

[0240] Based on the implementation of the multi-TRP scheme as described herein, the processor of the UE 115 (e.g., controlling the receiver 710, the transmitter 720, or as described in reference Fig.10 The transceiver 1020) can reduce signaling overhead and improve flexibility in communications indicated by multiple TRP schemes by implementing dynamic multiple TRP indications and switching.

[0241] Figure 8 A block diagram 800 of a device 805 supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The device 805 can be an example of aspects of the device 705 or UE 115 as described herein. The device 805 can include a receiver 810, a multi-TRP manager 815, and a transmitter 860. The device 805 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0242] The receiver 810 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to dynamic switching between different multi-TRP schemes). The information may be passed to other components of the device 805. The receiver 810 may be a reference Fig.10 Examples of aspects of the transceiver 1020 are described. The receiver 810 may utilize a single antenna or a collection of antennas.

[0243] The multi-TRP manager 815 may be an example of aspects of the multi-TRP manager 715 as described herein. The multi-TRP manager 815 may include a DCI receiving component 820, a TCI field identifier 825, a (multi) antenna port field identifier 830, a multi-TCI scheme field identifier 835, a rate matching determination component 840, an RV identifier 845, a TCI state determination component 850, a PRB bundling size indicator field identifier 855, or some combination of these components. The multi-TRP manager 815 may be an example of aspects of the multi-TRP manager 1010 described herein. The device 805 (e.g., UE 115) may operate according to one or more of the following examples.

[0244] In a first example, the DCI receiving component 820 may receive a DCI message including an indication of a first bit set and a second bit set from a base station. The TCI field identifier 825 may use the first bit set to identify a TCI state set for communicating with the base station. The (multi-) antenna port field identifier 830 may use the second bit set to identify an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based on identifying the TCI state set.

[0245] In a second example, the DCI receiving component 820 may receive a DCI message including an indication of a first set of bits and a second set of bits from a base station. The TCI field identifier 825 may use the first set of bits to identify one or more TCI states for communicating with the base station. The multi-TCI scheme field identifier 835 may use the second set of bits and identify a multi-TRP scheme from a set of possible schemes for multi-TRP operation or identify a single TRP scheme for single TRP operation based on the UE (e.g., device 805) being configured for multi-TRP operation.

[0246] In a third example, the DCI receiving component 820 may receive a DCI message including an indication of a bit set from a base station. The rate matching determination component 840 may determine a rate matching process performed by the base station, wherein the rate matching process includes joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set. The RV identifier 845 may use the bit set and based on the rate matching process, identify a joint RV for the first TCI state and the second TCI state if the rate matching process includes joint rate matching; or identify a first RV for the first TCI state and a second RV for the second TCI state if the rate matching process includes separate rate matching.

[0247] In a fourth example, the DCI receiving component 820 may receive a DCI message including a bit indication from a base station. The TCI state determining component 850 may determine to receive a transmission from a base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state. The PRB bundling size indicator field identifier 855 may use the bit to identify a first PRG size and a second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state.

[0248] Transmitter 860 can transmit signals generated by other components of device 805. In some examples, transmitter 860 can be co-located with receiver 810 in a transceiver module. For example, transmitter 860 can be a reference Fig.10 Examples of aspects of the transceiver 1020 are described. The transmitter 860 may utilize a single antenna or a collection of antennas.

[0249] Fig. 9A block diagram 900 of a multi-TRP manager 905 supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The multi-TRP manager 905 can be an example of aspects of the multi-TRP manager 715, the multi-TRP manager 815, or the multi-TRP manager 1010 described herein. The multi-TRP manager 905 can include a DCI receiving component 910, a TCI field identifier 915, a (multi) antenna port field identifier 920, a table selection component 925, a table configuration component 930, a multi-TCI scheme field identifier 935, a capability reporting component 940, a rate matching determination component 945, an RV identifier 950, a joint table component 955, a time slot aggregation component 960, a TCI state determination component 965, a PRB bundling size indicator field identifier 970, or any combination of these components. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0250] In some implementations, DCI receiving component 910 can receive a DCI message from a base station that includes an indication of a first set of bits and a second set of bits. TCI field identifier 915 can use the first set of bits to identify a TCI state set for communicating with the base station.

[0251] The (multi-) antenna port field identifier 920 can use a second bit set to identify the antenna port set and the multi-TRP scheme from a set of possible schemes for multi-TRP operation based on identifying the TCI state set. In some examples, the (multi-) antenna port field identifier 920 can use a second bit set to identify the modulation order of at least one TCI state in the TCI state set. In some examples, the (multi-) antenna port field identifier 920 can use a second bit set to identify the RV of the TB for at least one TCI state in the TCI state set. In some cases, the multi-TRP scheme includes a joint SDM scheme, a separate SDM scheme, a joint FDM scheme, a separate FDM scheme, a joint TDM scheme, a separate TDM scheme, or a combination thereof. In some cases, the second bit set includes the same number of bits as the bit set indicating the antenna port set for single TRP operation.

[0252] In some cases, the TCI field identifier 915 can select a message set from a TRP set based on identifying a multi-TRP scheme. In some cases, the multi-TRP operation includes communication with a TRP set at a base station or distributed on a set of base stations including at least the base station.

[0253] Table selection component 925 can select a lookup table that maps the second bit set to the antenna port set and the multi-TRP scheme from the lookup table set, wherein the identification of the antenna port set and the multi-TRP scheme is based on the selection. In some cases, table configuration component 930 can receive a configuration of the lookup table, a set of lookup tables, or a combination thereof from a base station. In other cases, a lookup table that maps the second bit set to both the antenna port set and the multi-TRP scheme is preconfigured in a memory.

[0254] In some implementations, DCI receiving component 910 can receive a DCI message from a base station that includes an indication of a first set of bits and a second set of bits. TCI field identifier 915 can use the first set of bits to identify one or more TCI states for communicating with the base station.

[0255] The multi-TCI scheme field identifier 935 may use a second set of bits and based on the UE being configured for multi-TRP operation, identify a multi-TRP scheme from a set of possible schemes for multi-TRP operation or identify a single TRP scheme for single TRP operation. In some examples, one or more TCI states include multiple TCI states. In some of these examples, the multi-TCI scheme field identifier 935 may use a second set of bits to identify a modulation order for at least one TCI state in the set of TCI states. Additionally or alternatively, the multi-TCI scheme field identifier 935 may use a second set of bits to identify an RV of a TB for at least one TCI state in the set of TCI states.

[0256] In some cases, a multi-TRP scheme or a single TRP scheme is identified based on whether the first bit set indicates one TCI state or a set of TCI states. In other cases, one or more TCI states are identified based on whether the second bit set indicates a multi-TRP scheme or a single TRP scheme.

[0257] In some examples, the one or more TCI states may include multiple TCI states. In some of these examples, the table selection component 925 may identify the multiple TRP scheme based on mapping the second bit set to a lookup table of multiple TRP schemes for the TCI state set. In some cases, the table configuration component 930 may receive a configuration of the lookup table from the base station. In other cases, the lookup table mapping the second bit set to the multiple TRP scheme for the TCI state set is pre-configured in the memory.

[0258] The capability reporting component 940 may send an indication of the capabilities of the UE to a base station, wherein the capabilities of the UE indicate that the UE is configured for multi-TRP operation.

[0259] In some examples, the DCI message includes an indication of a third bit set, one or more TCI states include multiple TCI states, and the multi-TRP scheme is an example of an SDM multi-TRP scheme. In these examples, the (multi) antenna port field identifier 920 can use a third bit set to identify an antenna port set for communicating with a base station, wherein a first antenna port set of the antenna port set corresponds to a first TCI state of the TCI state set, and a second antenna port set of the antenna port set corresponds to a second TCI state of the TCI state set. In some examples, the DCI message includes an indication of a third bit set, and one or more TCI states include multiple TCI states. In these examples, the (multi) antenna port field identifier 920 can use a third bit set to identify an antenna port set for communicating with a base station and an example of whether the multi-TRP scheme is an SDM multi-TRP scheme, wherein a multi-TRP scheme or a single TRP scheme is identified based on whether the multi-TRP scheme is an SDM multi-TRP scheme.

[0260] In some embodiments, the DCI receiving component 910 may receive a DCI message including an indication of a bit set from a base station. The rate matching determination component 945 may determine a rate matching process performed by the base station, wherein the rate matching process includes a joint rate matching or a separate rate matching of TBs for a first TCI state of a TCI state set and a second TCI state of a TCI state set. In some cases, the bit set includes a first bit set, the DCI message also includes an indication of a second bit set, and the rate matching process performed by the base station is determined using the second bit set. In other cases, the rate matching process performed by the base station is determined using a bit set.

[0261] The RV identifier 950 can use a bit set and based on the rate matching process, if the rate matching process includes joint rate matching, identify a joint RV for the first TCI state and the second TCI state; if the rate matching process includes separate rate matching, identify a first RV for the first TCI state and a second RV for the second TCI state.

[0262] In some examples, the table selection component 925 can select between a first lookup table that maps a set of bits to a joint RV and a second lookup table that maps a set of bits to a combination of a first RV and a second RV, wherein the identification is based on the selection. In some cases, the first lookup table, the second lookup table, or a combination thereof are preconfigured in a memory. In other cases, the table configuration component 930 can receive a configuration of the first lookup table, the second lookup table, or a combination thereof from a base station.

[0263] In some cases, the joint table component 955 identifies the joint RV or the first RV and the second RV based on a lookup table that maps a bit set to one or more RVs. In some cases, the lookup table is pre-configured in a memory. In other cases, the table configuration component 930 can receive a configuration of the lookup table from a base station.

[0264] In some examples, the rate matching process includes separate rate matching. In some of these examples, the time slot aggregation component 960 can use a bit set and based on the rate matching process, identify a first RV for the first TCI state and a second RV for the second TCI state for each time slot in the set of time slots in the time slot aggregation process.

[0265] In some embodiments, the DCI receiving component 910 can receive a DCI message including a bit indication from a base station. The TCI state determination component 965 can determine to receive a transmission from a base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state. The PRB bundling size indicator field identifier 970 can use the bit to identify a first PRG size and a second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state.

[0266] In some cases, the first PRG size includes a first preconfigured number of PRBs, a number of PRBs in a first PRB set, or a combination thereof, and the second PRG size includes a second preconfigured number of PRBs, a number of PRBs in a second PRB set, or a combination thereof. Identifying the first PRG size may involve a PRB bundling size indicator field identifier 970 that identifies the first PRG size as the number of PRBs in the first PRB set if the first PRB set is contiguous in frequency, the frequency size of the first PRB set is greater than a threshold frequency size, or a combination thereof. Identifying the second PRG size may involve a PRB bundling size indicator field identifier 970 that identifies the second PRG size as the number of PRBs in the second PRB set if the second PRB set is contiguous in frequency, the frequency size of the second PRB set is greater than a threshold frequency size, or a combination thereof.

[0267] Fig.10A diagram of a system 1000 including a device 1005 that supports dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The device 1005 may be an example of or include components of a device 705, a device 805, or a UE 115 as described herein. The device 1005 may include components for two-way voice and data communications, including components for sending and receiving communications, including a multi-TRP manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may communicate electronically via one or more buses (e.g., bus 1045).

[0268] In some cases, the multi-TRP manager 1010 may receive a DCI message including an indication of a first bit set and a second bit set from a base station, identify a TCI state set for communicating with the base station using the first bit set, and identify an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation using the second bit set based on identifying the TCI state set. In other cases, the multi-TRP manager 1010 may receive a DCI message including an indication of a first bit set and a second bit set from a base station, identify one or more TCI states for communicating with the base station using the first bit set, and identify a multi-TRP scheme from a set of possible schemes for multi-TRP operation or identify a single TRP scheme for single TRP operation using the second bit set and based on the UE being configured for multi-TRP operation.

[0269] Additionally or alternatively, the multi-TRP manager 1010 may receive a DCI message including an indication of a bit set from a base station, determine a rate matching process performed by the base station, wherein the rate matching process includes joint rate matching or separate rate matching of TBs for a first TCI state of a TCI state set and a second TCI state of the TCI state set, and use the bit set and based on the rate matching process, if the rate matching process includes joint rate matching, identify a joint RV for the first TCI state and the second TCI state, or if the rate matching process includes separate rate matching, identify a first RV for the first TCI state and a second RV for the second TCI state. In some cases, the multi-TRP manager 1010 may receive a DCI message including an indication of a bit from a base station, determine to receive a transmission from the base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state, and use the bit set to identify a first PRG size and a second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state.

[0270] I / O controller 1015 can manage input and output signals for device 1005. I / O controller 1015 can also manage peripheral devices that are not integrated into device 1005. In some cases, I / O controller 1015 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1015 can utilize a computer such as a Or another known operating system. In other cases, I / O controller 1015 can be represented or interacted with by a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1015 can be implemented as part of a processor. In some cases, a user can interact with device 1005 via I / O controller 1015 or via hardware components controlled by I / O controller 1015.

[0271] The transceiver 1020 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1020 can also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0272] In some cases, a wireless device may include a single antenna 1025. However, in some cases, a device may have more than one antenna 1025, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0273] The memory 1030 may include random access memory (RAM) and read-only memory (ROM). The memory 1030 may store computer-readable computer executable code 1035, which includes instructions that cause the processor to perform various functions described herein when executed. In some cases, the memory 1030 may contain a basic I / O system (BIOS), etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0274] Processor 1040 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1040 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., functions or tasks that support dynamic switching between different multi-TRP schemes).

[0275] The code 1035 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 1035 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 1035 may not be directly executed by the processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0276] Fig.11 A block diagram 1100 of a device 1105 supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The device 1105 can be an example of aspects of the base station 105 as described herein. The device 1105 can include a receiver 1110, a multi-TRP manager 1115, and a transmitter 1120. The device 1105 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0277] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to dynamic switching between different multi-TRP schemes). The information may be passed to other components of the device 1105. The receiver 1110 may be a reference Fig.14 Examples of aspects of transceiver 1420 are described. Receiver 1110 may utilize a single antenna or a collection of antennas.

[0278] In some embodiments, the multi-TRP manager 1115 may generate a first bit set indicating a TCI state set for communicating with the UE, generate a second bit set indicating an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based on the first bit set indicating the TCI state set, and send a DCI message including indications of the first bit set and the second bit set to the UE.

[0279] In other embodiments, the multi-TRP manager 1115 may identify that the UE is configured for multi-TRP operation, generate a first bit set indicating one or more TCI states for communicating with the UE, generate a second bit set based on the UE being configured for multi-TRP operation, wherein the second bit set indicates a multi-TRP scheme from a set of possible schemes for multi-TRP operation or a single TRP scheme for single TRP operation, and send a DCI message to the UE including indications of the first bit set and the second bit set.

[0280] Additionally or alternatively, the multi-TRP manager 1115 may determine to use a TCI state set to transmit to the UE and perform a rate matching process, the rate matching process including joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set. The multi-TRP manager 1115 may generate a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state, and transmit a DCI message including an indication of the bit set to the UE.

[0281] Additionally or alternatively, the multi-TRP manager 1115 may also determine to use a TCI state set to transmit to the UE in an FDM multi-TRP scheme, determine a first PRG size for precoding transmission of a first TCI state of the TCI state set and a second PRG size for precoding transmission of a second TCI state of the TCI state set based on the FDM multi-TRP scheme, generate bits indicating the first PRG size and the second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state, and send a DCI message including an indication of the bit to the UE. The multi-TRP manager 1115 may be an example of aspects of the multi-TRP manager 1410 described herein.

[0282] The multi-TRP manager 1115 or its subcomponents may be implemented by hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the multi-TRP manager 1115 or its subcomponents may be performed by a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0283] The multi-TRP manager 1115 or its subcomponents can be physically located in various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the multi-TRP manager 1115 or its subcomponents can be independent and distinct components according to various aspects of the present disclosure. In some examples, the multi-TRP manager 1115 or its subcomponents can be combined with one or more other hardware components, including but not limited to I / O components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof according to various aspects of the present disclosure.

[0284] Transmitter 1120 can transmit signals generated by other components of device 1105. In some examples, transmitter 1120 can be co-located with receiver 1110 in a transceiver module. For example, transmitter 1120 can be a reference Fig.14 Examples of aspects of the transceiver 1420 are described. The transmitter 1120 may utilize a single antenna or a collection of antennas.

[0285] Fig.12 A block diagram 1200 of a device 1205 supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The device 1205 can be an example of aspects of the device 1105 or base station 105 as described herein. The device 1205 can include a receiver 1210, a multi-TRP manager 1215, and a transmitter 1270. The device 1205 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0286] The receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to dynamic switching between different multi-TRP schemes). The information may be passed to other components of the device 1205. The receiver 1210 may be a reference Fig.14 Examples of aspects of transceiver 1420 are described. Receiver 1210 may utilize a single antenna or a collection of antennas.

[0287] The multi-TRP manager 1215 may be an example of aspects of the multi-TRP manager 1115 as described herein. The multi-TRP manager 1215 may include a TCI field generator 1220, a (multi) antenna port field generator 1225, a DCI transmission component 1230, a UE configuration identifier 1235, a multi-TCI scheme field generator 1240, a TCI state determination component 1245, a rate matching component 1250, a RV component 1255, a PRG size adjustment component 1260, a PRB bundling size indicator field generator 1265, or some combination thereof. The multi-TRP manager 1215 may be an example of aspects of the multi-TRP manager 1410 described herein. The device 1205 (e.g., the base station 105) may operate according to one or more of the following examples.

[0288] In a first example, the TCI field generator 1220 may generate a first bit set indicating a TCI state set for communicating with the UE. The (multi) antenna port field generator 1225 may generate a second bit set indicating an antenna port set and a multi-TRP scheme from a possible scheme set for multi-TRP operation based on the first bit set indicating the TCI state set. The DCI transmission component 1230 may send a DCI message including an indication of the first bit set and the second bit set to the UE.

[0289] In a second example, the UE configuration identifier 1235 may identify that the UE is configured for multi-TRP operation. The TCI field generator 1220 may generate a first bit set indicating one or more TCI states for communicating with the UE. The multi-TCI scheme field generator 1240 may generate a second bit set based on the UE being configured for multi-TRP operation, wherein the second bit set indicates a multi-TRP scheme from a possible set of schemes for multi-TRP operation or a single TRP scheme for single TRP operation. The DCI transmission component 1230 may send a DCI message including an indication of the first bit set and the second bit set to the UE.

[0290] In a third example, the TCI state determination component 1245 may determine to use a TCI state set for transmission to the UE. The rate matching component 1250 may perform a rate matching process that includes joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set. The RV component 1255 may generate a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state. The DCI transmission component 1230 may send a DCI message including an indication of the bit set to the UE.

[0291] In a fourth example, the TCI state determination component 1245 may determine to use a TCI state set to transmit to the UE in an FDM multi-TRP scheme. The PRG size adjustment component 1260 may determine a first PRG size for precoding transmissions of a first TCI state of the TCI state set and a second PRG size for precoding transmissions of a second TCI state of the TCI state set based on the FDM multi-TRP scheme. The PRB bundling size indicator field generator 1265 may generate bits indicating the first PRG size and the second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state.

[0292] DCI transmitting component 1230 may transmit a DCI message including an indication of the bit to the UE.

[0293] Transmitter 1270 can transmit signals generated by other components of device 1205. In some examples, transmitter 1270 can be co-located with receiver 1210 in a transceiver module. For example, transmitter 1270 can be a reference Fig.14 Examples of aspects of the transceiver 1420 are described. The transmitter 1270 may utilize a single antenna or a collection of antennas.

[0294] Fig.13 A block diagram 1300 of a multi-TRP manager 1305 supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The multi-TRP manager 1305 can be an example of aspects of the multi-TRP manager 1115, the multi-TRP manager 1215, or the multi-TRP manager 1410 described herein. The multi-TRP manager 1305 can include a TCI field generator 1310, a (multi) antenna port field generator 1315, a DCI transmission component 1320, a table selection component 1325, a table configuration component 1330, a UE configuration identifier 1335, a multi-TCI scheme field generator 1340, a TCI state determination component 1345, a rate matching component 1350, an RV component 1355, a rate matching indicator 1360, a joint table component 1365, a time slot aggregation component 1370, a PRG size adjustment component 1375, a PRB bundling size indicator field generator 1380, or any combination thereof. Each of these modules may be in communication with each other, directly or indirectly (eg, via one or more buses).

[0295] In some embodiments, the TCI field generator 1310 may generate a first bit set indicating a TCI state set for communicating with the UE. The (multi) antenna port field generator 1315 may generate a second bit set indicating an antenna port set and a multi-TRP scheme from a possible scheme set for multi-TRP operation based on the first bit set indicating the TCI state set. In some cases, the second bit set further indicates the modulation order of at least one TCI state in the TCI state set. In some cases, the second bit set further indicates the RV of the TB for at least one TCI state in the TCI state set. In some cases, the multi-TRP scheme includes a joint SDM scheme, a separate SDM scheme, a joint FDM scheme, a separate FDM scheme, a joint TDM scheme, a separate TDM scheme, or a combination thereof. In some cases, the second bit set includes the same number of bits as the bit set indicating the antenna port set for single TRP operation. The DCI transmission component 1320 may send a DCI message including an indication of the first bit set and the second bit set to the UE.

[0296] The table selection component 1325 can select a lookup table that maps both the antenna port set and the multi-TRP scheme to a second bit set from a set of lookup tables, wherein generating the second bit set is based on the selection. In some cases, the table configuration component 1330 can configure a lookup table, a set of lookup tables, or a combination thereof, and can send an indication of the lookup table, the set of lookup tables, or a combination thereof to the UE. In other cases, a lookup table that maps both the antenna port set and the multi-TRP scheme to a second bit set is preconfigured in a memory. In some cases, the multi-TRP operation includes communicating with the UE via a TRP set at a base station or distributed on a set of base stations.

[0297] In some embodiments, the UE configuration identifier 1335 may identify that the UE is configured for multi-TRP operation. In some examples, the UE configuration identifier 1335 may receive an indication of the capabilities of the UE from the UE, wherein identifying that the UE is configured for multi-TRP operation is based on the capabilities of the UE.

[0298] The TCI field generator 1310 may generate a first bit set indicating one or more TCI states for communicating with the UE. The multi-TCI scheme field generator 1340 may generate a second bit set based on the UE being configured for multi-TRP operation, wherein the second bit set indicates a multi-TRP scheme from a possible set of schemes for multi-TRP operation or a single TRP scheme for single TRP operation. The DCI transmission component 1320 may send a DCI message including an indication of the first bit set and the second bit set to the UE.

[0299] In some cases, the second bit set is generated based on whether the first bit set indicates one TCI state or a set of TCI states. In other cases, the first bit set is generated based on whether the second bit set indicates a multi-TRP scheme or a single TRP scheme. In some cases, the one or more TCI states include multiple TCI states. In some of these cases, the second bit set further indicates the modulation order of at least one TCI state in the set of TCI states. Additionally or alternatively, the second bit set further indicates the RV of the TB for at least one TCI state in the set of TCI states.

[0300] In some examples, generating the second bit set involves a table selection component 1325 that determines that the one or more TCI states include multiple TCI states and identifies the second bit set based on a lookup table that maps a multi-TRP scheme for a set of TCI states to a second bit set. In some cases, the table configuration component 1330 can configure the lookup table and can send an indication of the lookup table to the UE. In other cases, a lookup table that maps a multi-TRP scheme for a set of TCI states to a second bit set is pre-configured in a memory.

[0301] In some examples, one or more TCI states include multiple TCI states, and the multi-TRP scheme is an example of an SDM multi-TRP scheme. In some of these examples, the (multi) antenna port field generator 1315 may generate a third bit set indicating an antenna port set for communicating with the UE, wherein the first antenna port set of the antenna port set corresponds to the first TCI state of the TCI state set, and the second antenna port set of the antenna port set corresponds to the second TCI state of the TCI state set, and wherein the DCI message also includes an indication of the third bit set. In some examples, one or more TCI states include multiple TCI states. In some of these examples, the (multi) antenna port field generator 1315 may generate a third bit set indicating the antenna port set for communicating with the UE and whether the multi-TRP scheme is an SDM multi-TRP scheme, wherein the second bit set is generated based on whether the multi-TRP scheme is an SDM multi-TRP scheme, and wherein the DCI message also includes an indication of the third bit set.

[0302] In some embodiments, the TCI state determination component 1345 may determine to use the TCI state for transmission to the UE. The rate matching component 1350 may perform a rate matching process that includes joint rate matching or separate rate matching of TBs for a first TCI state of a TCI state set and a second TCI state of a TCI state set. The RV component 1355 may generate a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state. The DCI transmission component 1320 may send a DCI message including an indication of the bit set to the UE.

[0303] In some cases, the bit set may be a first bit set, and the rate matching indicator 1360 may generate a second bit set indicating whether the rate matching process includes joint rate matching or separate rate matching, wherein the DCI message also includes an indication of the second bit set. In other cases, the bit set further indicates whether the rate matching process includes joint rate matching or separate rate matching.

[0304] In some examples, the table selection component 1325 can select between a first lookup table that maps a joint RV to a set of bits and a second lookup table that maps a combination of the first RV and the second RV to a set of bits, wherein the generation is based on the selection. In some cases, the first lookup table, the second lookup table, or a combination thereof are preconfigured in a memory. In other cases, the table configuration component 1330 can configure the first lookup table, the second lookup table, or a combination thereof, and can send an indication of the first lookup table, the second lookup table, or a combination thereof to the UE.

[0305] In some cases, generating a bit set may involve a joint table component 1365 that identifies a bit set based on a lookup table that maps one or more RVs to a bit set. In some cases, the lookup table is pre-configured in a memory. In other cases, the table configuration component 1330 may configure the lookup table and may send an indication of the lookup table to the UE.

[0306] In some examples, the rate matching process includes separate rate matching, and the time slot aggregation component 1370 can perform the time slot aggregation process on the TB on the time slot set, wherein, for each time slot in the time slot set, the bit set further indicates a first RV for a first TCI state and a second RV for a second TCI state.

[0307] In some embodiments, the TCI state determination component 1345 may determine to use a TCI state set to transmit to the UE in an FDM multi-TRP scheme. The PRG size adjustment component 1375 may determine a first PRG size for precoding a transmission of a first TCI state of the TCI state set and a second PRG size for precoding a transmission of a second TCI state of the TCI state set based on the FDM multi-TRP scheme. The PRB bundling size indicator field generator 1380 may generate bits indicating the first PRG size and the second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state. The DCI transmission component 1320 may send a DCI message including an indication of the bit to the UE.

[0308] In some cases, the first PRG size includes a first preconfigured number of PRBs, a number of PRBs in a first PRB set, or a combination thereof, and the second PRG size includes a second preconfigured number of PRBs, a number of PRBs in a second PRB set, or a combination thereof. In some cases, the first PRG size may be the number of PRBs in the first PRB set if the first PRB set is contiguous in frequency, the frequency size of the first PRB set is greater than a threshold frequency size, or a combination thereof. In these cases, the second PRG size may be the number of PRBs in the second PRB set if the second PRB set is contiguous in frequency, the frequency size of the second PRB set is greater than a threshold frequency size, or a combination thereof.

[0309] Fig.14 A diagram of a system 1400 including a device 1405 that supports dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. Device 1405 may be an example of or include components of device 1105, device 1205, or base station 105 as described herein. Device 1405 may include components for two-way voice and data communications, including components for sending and receiving communications, including a multi-TRP manager 1410, a network communication manager 1415, a transceiver 1420, an antenna 1425, a memory 1430, a processor 1440, and an inter-station communication manager 1445. These components may be in electronic communication via one or more buses (e.g., bus 1450).

[0310] In some cases, the multi-TRP manager 1410 may generate a first bit set indicating a set of TCI states for communicating with the UE, generate a second bit set indicating an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based on the first bit set indicating the set of TCI states, and send a DCI message including indications of the first bit set and the second bit set to the UE. In other cases, the multi-TRP manager 1410 may identify that the UE is configured for multi-TRP operation, generate a first bit set indicating one or more TCI states for communicating with the UE, generate a second bit set based on the UE being configured for multi-TRP operation, wherein the second bit set indicates a multi-TRP scheme from a set of possible schemes for multi-TRP operation or a single TRP scheme for single TRP operation, and send a DCI message including indications of the first bit set and the second bit set to the UE.

[0311] Additionally or alternatively, the multi-TRP manager 1410 may determine to use a TCI state set to send to the UE, perform a rate matching process that includes joint rate matching or separate rate matching of TBs for a first TCI state of the TCI state set and a second TCI state of the TCI state set, generate a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state, and send a DCI message including an indication of the bit set to the UE. In some cases, the multi-TRP manager 1410 may determine to use a TCI state set to transmit to the UE in an FDM multi-TRP scheme, determine a first PRG size for precoding transmissions of a first TCI state of the TCI state set and a second PRG size for precoding transmissions of a second TCI state of the TCI state set based on the FDM multi-TRP scheme, generate bits indicating the first PRG size and the second PRG size based on a first PRB set corresponding to the first TCI state and a second PRB set corresponding to the second TCI state, and send a DCI message including an indication of the bit to the UE.

[0312] The network communications manager 1415 can manage communications with the core network 130 (eg, via one or more wired backhaul links). For example, the network communications manager 1415 can manage the delivery of data communications for client devices such as one or more UEs 115.

[0313] The transceiver 1420 may communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1420 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1420 may also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0314] In some cases, a wireless device may include a single antenna 1425. However, in some cases, a device may have more than one antenna 1425, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0315] Memory 1430 may include RAM, ROM, or a combination thereof. Memory 1430 may store computer readable code 1435, which includes instructions that, when executed by a processor (e.g., processor 1440), cause the device to perform various functions described herein. In some cases, memory 1430 may contain BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0316] Processor 1440 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1440 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1440. Processor 1440 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks that support dynamic switching between different multi-TRP schemes).

[0317] The inter-site communication manager 1445 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in collaboration with other base stations 105. For example, the inter-site communication manager 1445 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1445 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0318] The code 1435 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 1435 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 1435 may not be directly executed by the processor 1440, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0319] Fig.15 A flow chart illustrating a method 1500 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by the base station 105 or components thereof, as described herein. For example, the operations of the method 1500 may be performed by a multi-TRP manager, as described in reference to Figure 11 to Figure 14In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0320] At 1505, the base station may generate a first bit set indicating a TCI state set for communicating with the UE. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be as described in reference to Figures 11 to 14 The TCI field generator is used to perform

[0321] At 1510, the base station may generate a second bit set indicating an antenna port set and a multi-TRP scheme from a possible set of schemes for multi-TRP operation based on a first bit set indicating a TCI state set. The operation of 1510 may be performed according to the methods described herein. In some examples, such as reference Figures 11 to 14 As described, aspects of the operation of 1510 may be performed by a (multi-) antenna port field generator.

[0322] At 1515, the base station may send a DCI message including an indication of the first set of bits and the second set of bits to the UE. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be as described in reference to Figures 11 to 14 The DCI transmission component is used to perform.

[0323] Fig.16 A flow chart illustrating a method 1600 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1600 may be performed by a multi-TRP manager, as described in reference to Figures 7 to 10 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0324] At 1605, the UE may receive a DCI message including an indication of a first set of bits and a second set of bits from a base station. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be as described in reference to Figures 7 to 10 The DCI receiving component is used to perform.

[0325] At 1610, the UE may use a first bit set to identify a TCI state set for communicating with a base station. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be as described in reference to Figures 7 to 10 The TCI field identifier is executed.

[0326] At 1615, the UE may use a second bit set to identify the antenna port set and the multi-TRP scheme from the set of possible schemes for multi-TRP operation based on the identification of the TCI state set. The operation of 1615 may be performed according to the methods described herein. In some examples, such as reference Figures 7 to 10 As described, aspects of the operation of 1615 may be performed by a (multi-) antenna port field identifier.

[0327] Fig.17 A flow chart illustrating a method 1700 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by the base station 105 or components thereof, as described herein. For example, the operations of the method 1700 may be performed by a multi-TRP manager, as described in reference to Figure 11 to Figure 14 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0328] At 1705, the base station may identify that the UE is configured for multi-TRP operation. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be as described in reference to Figures 11 to 14 The UE configuration identifier is used to perform the operation.

[0329] At 1710, the base station may generate a first set of bits indicating one or more TCI states for communicating with the UE. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be as described in reference to Figures 11 to 14 The TCI field generator is used to perform

[0330] At 1715, the base station may generate a second set of bits based on the UE being configured for multi-TRP operation, wherein the second set of bits indicates a multi-TRP scheme from a set of possible schemes for multi-TRP operation or a single TRP scheme for single TRP operation. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be as described in reference to Figures 11 to 14 The multi-TCI scheme field generator is used to execute.

[0331] At 1720, the base station may send a DCI message including an indication of the first set of bits and the second set of bits to the UE. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be as described in reference to Figures 11 to 14The DCI transmission component is used to perform.

[0332] Fig.18 A flow chart illustrating a method 1800 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The operations of the method 1800 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1800 may be performed by a multi-TRP manager, as described in reference to Figures 7 to 10 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0333] At 1805, the UE may receive a DCI message including an indication of a first set of bits and a second set of bits from a base station. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be as described in reference to Figures 7 to 10 The DCI receiving component is used to perform.

[0334] At 1810, the UE may use a first bit set to identify one or more TCI states for communicating with a base station. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be as described in reference to Figures 7 to 10 The TCI field identifier is executed.

[0335] At 1815, the UE may use the second bit set and identify the multi-TRP scheme from the set of possible schemes for multi-TRP operation or identify the single TRP scheme for single TRP operation based on the UE being configured for multi-TRP operation. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be as described in reference to Figures 7 to 10 The multi-TCI scheme field identifier is used to perform the above.

[0336] Fig.19 A flow chart illustrating a method 1900 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The operations of the method 1900 may be implemented by the base station 105 or components thereof, as described herein. For example, the operations of the method 1900 may be performed by a multi-TRP manager, as described in reference to Figure 11 to Figure 14 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0337] At 1905, the base station may determine to use a TCI state set to send to the UE. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be as described in reference to Figures 11 to 14 The TCI status determination component is executed.

[0338] At 1910, the base station may perform a rate matching process including joint rate matching or separate rate matching of TBs for a first TCI state of a TCI state set and a second TCI state of a TCI state set. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be as described in reference to Figures 11 to 14 The rate matching component is used to perform the above operation.

[0339] At 1915, the base station may generate a bit set based on the rate matching process, wherein if the rate matching process includes joint rate matching, the bit set indicates a joint RV for the first TCI state and the second TCI state, and if the rate matching process includes separate rate matching, the bit set indicates a first RV for the first TCI state and a second RV for the second TCI state. The operation of 1915 may be performed according to the method described herein. In some examples, such as reference Figures 11 to 14 As described, aspects of the operation of 1915 may be performed by the RV component.

[0340] At 1920, the base station may send a DCI message including an indication of the bit set to the UE. The operations of 1920 may be performed according to the methods described herein. In some examples, aspects of the operations of 1920 may be as described in reference to Figures 11 to 14 The DCI transmission component is used to perform.

[0341] Fig. 20 A flow chart illustrating a method 2000 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The operations of the method 2000 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 2000 may be performed by a multi-TRP manager, as described in reference to Figures 7 to 10 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0342] At 2005, the UE may receive a DCI message including an indication of a bit set from a base station. The operations of 2005 may be performed according to the methods described herein. In some examples, aspects of the operations of 2005 may be as described in reference to Figures 7 to 10 The DCI receiving component is used to perform.

[0343] At 2010, the UE may determine a rate matching process performed by the base station, wherein the rate matching process includes joint rate matching or separate rate matching for TBs of a first TCI state of the TCI state set and a second TCI state of the TCI state set. The operations of 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be performed as described in reference to Figures 7 to 10 The rate matching is performed by a determination component.

[0344] At 2015, the UE may use the bit set and based on the rate matching process, if the rate matching process includes joint rate matching, identify a joint RV for the first TCI state and the second TCI state; or if the rate matching process includes separate rate matching, identify a first RV for the first TCI state and a second RV for the second TCI state. The operation of 2015 may be performed according to the method described herein. In some examples, such as reference Figures 7 to 10 As described, aspects of the operation of 2015 may be performed by the RV identifier.

[0345] Fig.21 A flow chart illustrating a method 2100 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The operations of the method 2100 may be implemented by the base station 105 or components thereof, as described herein. For example, the operations of the method 2100 may be performed by a multi-TRP manager, as described in reference to Figure 11 to Figure 14 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0346] At 2105, the base station may determine to use a TCI state set to send to the UE in the FDM multi-TRP scheme. The operation of 2105 may be performed according to the method described herein. In some examples, aspects of the operation of 2105 may be as described in reference to Figures 11 to 14 The TCI status determination component is executed.

[0347] At 2110, the base station may determine, based on the FDM multi-TRP scheme, a first PRG size for precoding transmissions of a first TCI state of the TCI state set and a second PRG size for precoding transmissions of a second TCI state of the TCI state set. The operations of 2110 may be performed according to the methods described herein. In some examples, aspects of the operations of 2110 may be as described in reference to Figures 11 to 14 The PRG resizing component is used to perform the above.

[0348] At 2115, the base station may generate bits indicating a first PRG size and a second PRG size based on a first PRB set corresponding to a first TCI state and a second PRB set corresponding to a second TCI state. The operations of 2115 may be performed according to the methods described herein. In some examples, aspects of the operations of 2115 may be as described in reference to Figures 11 to 14 The PRB bundling size indicator field generator is performed.

[0349] At 2120, the base station may send a DCI message including an indication of the bit to the UE. The operations of 2120 may be performed according to the methods described herein. In some examples, aspects of the operations of 2120 may be as described in reference to Figures 11 to 14 The DCI transmission component is used to perform.

[0350] Fig. 22 A flow chart illustrating a method 2200 for supporting dynamic switching between different multi-TRP schemes according to aspects of the present disclosure is shown. The operations of the method 2200 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 2200 may be performed by a multi-TRP manager, as described in reference to Figures 7 to 10 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0351] At 2205, the UE may receive a DCI message including an indication of a bit from the base station. The operations of 2205 may be performed according to the methods described herein. In some examples, aspects of the operations of 2205 may be as described in reference to Figures 7 to 10 The DCI receiving component is used to perform.

[0352] At 2210, the UE may determine to receive a transmission from a base station using a TCI state set in an FDM multi-TRP scheme, wherein the TCI state set includes a first TCI state and a second TCI state. The operations of 2210 may be performed according to the methods described herein. In some examples, aspects of the operations of 2210 may be as described in reference to Figures 7 to 10 The TCI status determination component is executed.

[0353] At 2215, the UE may use the bit to identify a first PRG size and a second PRG size based on a first PRB set corresponding to a first TCI state and a second PRB set corresponding to a second TCI state. The operations of 2215 may be performed according to the methods described herein. In some examples, aspects of the operations of 2215 may be as described in reference to Figures 7 to 10 The PRB bundling size indicator field identifier is used to perform the above operation.

[0354] Described below are multiple examples of methods, systems, or devices, including components for implementing the methods or implementing the devices, non-transitory computer-readable media storing instructions executable by one or more processors to enable the one or more processors to implement the methods, and systems including one or more processors and a memory coupled to the one or more processors, the memory storing instructions executable by one or more processors to enable the system or device to implement the methods. It should be understood that these are just some examples, and other examples will be apparent to those skilled in the art without departing from the scope of the present invention.

[0355] Example 1: A method for wireless communication, comprising: generating a first bit set indicating multiple TCI states for communicating with a UE, generating a second bit set indicating an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based at least in part on the first bit set indicating the multiple TCI states; and sending a DCI message including an indication of the first bit set and the second bit set to the UE.

[0356] Example 2: The method according to Example 1 also includes: selecting a lookup table from multiple lookup tables that maps both the antenna port set and the multi-TRP scheme to a second bit set, wherein generating the second bit set is at least partially based on the selection.

[0357] Example 3: The method according to Example 2 also includes: configuring a lookup table, multiple lookup tables, or a combination thereof; and sending an indication of the lookup table, multiple lookup tables, or a combination thereof to the UE.

[0358] Example 4: The method of any one of Examples 1 to 3, wherein the second set of bits further indicates a modulation order of at least one TCI state of the plurality of TCI states.

[0359] Example 5: The method of any one of Examples 1 to 4, wherein the second set of bits further indicates an RV of the TB for at least one TCI state of the plurality of TCI states.

[0360] Example 6: According to the method of any one of Examples 1 to 5, the multi-TRP scheme includes a joint SDM scheme, a separate SDM scheme, a joint FDM scheme, a separate FDM scheme, a joint TDM scheme, a separate TDM scheme, or a combination thereof.

[0361] Example 7: A method according to any one of Examples 1 to 6, wherein the second bit set includes the same number of bits as the bit set indicating the antenna port set for single TRP operation.

[0362] Example 8: A method according to any one of Examples 1 to 7, wherein a lookup table mapping both antenna port sets and multi-TRP schemes to a second set of bits is pre-configured in a memory.

[0363] Example 9: A method according to any one of Examples 1 to 8, wherein the multi-TRP operation includes communicating with the UE through multiple TRPs at a base station or distributed across multiple base stations.

[0364] Example 10: An apparatus comprising at least one means for performing the method of any of Examples 1 to 9.

[0365] Example 11: An apparatus for wireless communication, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of Examples 1 to 9.

[0366] Example 12: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any of Examples 1 to 9.

[0367] Example 13: A method for performing wireless communications at a UE, comprising: receiving a DCI message including an indication of a first bit set and a second bit set from a base station; using the first bit set to identify multiple TCI states for communicating with the base station; and using the second bit set to identify an antenna port set and a multi-TRP scheme from a set of possible schemes for multi-TRP operation based at least in part on identifying the multiple TCI states.

[0368] Example 14: The method according to Example 13 also includes: selecting a lookup table from multiple lookup tables that maps the second bit set to both the antenna port set and the multi-TRP scheme, wherein identifying the antenna port set and the multi-TRP scheme is at least partially based on the selection.

[0369] Example 15: According to the method of Example 14, it also includes: receiving a configuration of a lookup table, multiple lookup tables or a combination thereof from a base station.

[0370] Example 16: The method of any one of Examples 13 to 15, further comprising: using a second set of bits to identify a modulation order of at least one TCI state in a plurality of TCI states.

[0371] Example 17: The method of any one of Examples 13 to 16 further includes: using a second bit set to identify an RV of a TB for at least one TCI state of a plurality of TCI states.

[0372] Example 18: According to the method of any one of Examples 13 to 17, the multi-TRP scheme includes a joint SDM scheme, a separate SDM scheme, a joint FDM scheme, a separate FDM scheme, a joint TDM scheme, a separate TDM scheme, or a combination thereof.

[0373] Example 19: A method according to any one of Examples 13 to 18, wherein the second bit set includes the same number of bits as the bit set indicating the antenna port set for single TRP operation.

[0374] Example 20: A method according to any one of Examples 13 to 19, wherein a lookup table mapping the second bit set to both the antenna port set and the multi-TRP scheme is pre-configured in a memory.

[0375] Example 21: A method according to any one of Examples 13 to 20, wherein the multi-TRP operation includes communication with multiple TRPs at a base station or multiple TRPs distributed on multiple base stations including at least the base station.

[0376] Example 22: The method of any of Examples 13 to 21 further includes: receiving multiple messages from multiple TRPs based at least in part on identifying a multi-TRP scheme.

[0377] Example 23: An apparatus at a UE comprising at least one component for performing the method of any one of Examples 13 to 22.

[0378] Example 24: An apparatus for wireless communication at a UE, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of Examples 13 to 22.

[0379] Example 25: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method of any of Examples 13 to 22.

[0380] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0381] The technology described herein can be used for various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. CDMA systems can implement radio technologies, such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions can be generally referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is generally referred to as CDMA2000 1xEV-DO, high speed packet data (HRPD), etc. UTRA includes broadband CDMA (WCDMA) and other variants of CDMA. TDMA systems can implement radio technologies, such as global system for mobile communications (GSM).

[0382] OFDMA systems can implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The technology described herein can be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable to applications other than LTE, LTE-A, LTE-A Pro, or NR applications.

[0383] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to a UE through a service subscription with a network provider. A small cell may be associated with a base station with lower power than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency band as a macro cell. According to various examples, a small cell may include a pico cell, a femto cell, and a micro cell. For example, a pico cell may cover a small geographic area and may allow unrestricted access to a UE through a service subscription with a network provider. A femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access to a UE associated with the femto cell (e.g., a UE in a closed subscriber group (CSG), a UE for a user in a home, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communications using one or more component carriers.

[0384] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0385] The information and signals described herein 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 referenced throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0386] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration.

[0387] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted on a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that portions of the functions are implemented in different physical locations.

[0388] Computer readable medium includes both non-transitory computer storage medium and communication medium, and computer storage medium and communication medium include any medium that helps to transfer computer program from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by general or special computer.As an example and not limitation, non-transitory computer readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, CD (CD) ROM or other optical disk storage, disk storage or other magnetic storage device or can be used for carrying or storing required program code mode in the form of instruction or data structure and can be accessed by general or special computer or general or special processor Any other non-transitory medium.In addition, any connection is appropriately referred to as computer readable medium.For example, if coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave) are used to send software from website, server or other remote source, coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology (such as infrared, radio and microwave) are included in the definition of medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0389] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items preceded by a phrase such as "at least one" or "one or more"), indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0390] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes between similar components. If only the first reference label is used in the specification, the specification applies to any one similar component having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0391] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "superior to other examples." For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, the technologies may be practiced without these specific details. In some cases, in order to avoid obscuring the concepts of the described examples, known structures and devices are shown in block diagram form.

[0392] The description provided herein enables those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but conforms to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising: generating a first set of bits indicating states of a plurality of transmission configuration indicators for communicating with a user equipment UE; generating, based at least in part on the first set of bits indicating the plurality of transmission configuration indicator states, a second set of bits indicating a set of antenna ports and a multiple transmission / reception point multiplexing scheme from a set of possible multiplexing schemes for multiple transmission / reception point operation, wherein each multiple transmission / reception point multiplexing scheme from the set of possible multiplexing schemes includes joint or individual rate matching implemented for a space division multiplexing scheme, a frequency division multiplexing scheme, a time division multiplexing scheme, or a combination thereof, the individual rate matching indicating a number of transmissions to be used for the plurality of transmission configuration indicator states; as well as A downlink control information message including an indication of the first set of bits and the second set of bits is sent to the UE.

2. The method according to claim 1, further comprising: A lookup table that maps both the antenna port set and the multiple transmission / reception point multiplexing scheme to the second set of bits is selected from a plurality of lookup tables, wherein the generating the second set of bits is based at least in part on the selection.

3. The method according to claim 2, further comprising: configuring the lookup table, the plurality of lookup tables, or a combination thereof; as well as An indication of the lookup table, the plurality of lookup tables, or a combination thereof is sent to the UE. 4 . The method of claim 1 , wherein the second set of bits further indicates a modulation order of at least one of the plurality of transmission configuration indicator states.

5. The method of claim 1, wherein the second set of bits further indicates a redundancy version of a transport block for at least one of the plurality of transport configuration indicator states.

6. The method according to claim 1, wherein the multiple transmission / reception point multiplexing scheme comprises a joint space division multiplexing scheme, a separate space division multiplexing scheme, a joint frequency division multiplexing scheme, a separate frequency division multiplexing scheme, a joint time division multiplexing scheme, a separate time division multiplexing scheme, or a combination thereof.

7. The method of claim 1, wherein the second set of bits includes the same number of bits as a set of bits indicating a set of antenna ports for a single transmission / reception point operation.

8. The method according to claim 1, wherein a lookup table mapping both the antenna port set and the multiple transmission / reception point multiplexing scheme to the second bit set is preconfigured in a memory.

9. The method of claim 1, wherein the multiple transmission / reception point operation comprises communicating with the UE through multiple transmission / reception points at a network device or distributed on multiple network devices.

10. A method for wireless communication at a user equipment UE, comprising: receiving, from a network device, a downlink control information message including an indication of a first set of bits and a second set of bits; identifying, using the first set of bits, a plurality of transmission configuration indicator states for communicating with the network device; as well as At least in part based on the identification of the multiple transmission configuration indicator states, using the second bit set, identify an antenna port set and a multiple transmission / reception point multiplexing scheme from a set of possible multiplexing schemes for multiple transmission / reception point operations, wherein each multiple transmission / reception point multiplexing scheme from the set of possible multiplexing schemes includes joint or individual rate matching implemented for a spatial division multiplexing scheme, a frequency division multiplexing scheme, a time division multiplexing scheme, or a combination thereof, and the individual rate matching indicates the number of transmissions to be used for the multiple transmission configuration indicator states.

11. The method according to claim 10, further comprising: A lookup table is selected from a plurality of lookup tables that maps the second set of bits to both the antenna port set and the multiple transmission / reception point multiplexing scheme, wherein the identifying the antenna port set and the multiple transmission / reception point multiplexing scheme is based at least in part on the selection.

12. The method according to claim 11, further comprising: A configuration of the lookup table, the plurality of lookup tables, or a combination thereof is received from the network device.

13. The method according to claim 10, further comprising: The second set of bits is used to identify a modulation order of at least one transmission configuration indicator state of the plurality of transmission configuration indicator states.

14. The method according to claim 10, further comprising: The second set of bits is used to identify a redundancy version of a transport block for at least one of the plurality of transmission configuration indicator states.

15. The method of claim 10, wherein the multiple transmission / reception point multiplexing scheme comprises a joint space division multiplexing scheme, a separate space division multiplexing scheme, a joint frequency division multiplexing scheme, a separate frequency division multiplexing scheme, a joint time division multiplexing scheme, a separate time division multiplexing scheme, or a combination thereof.

16. The method of claim 10, wherein the second set of bits includes the same number of bits as a set of bits indicating a set of antenna ports for a single transmit / receive point operation.

17. The method according to claim 10, wherein a lookup table mapping the second bit set to both the antenna port set and the multiple transmission / reception point multiplexing scheme is preconfigured in a memory.

18. The method of claim 10, wherein the multiple transmission / reception point operation comprises communicating with a plurality of transmission / reception points at the network device or distributed across a plurality of network devices including at least the network device.

19. The method according to claim 18, further comprising: A plurality of messages are received from the plurality of transmit / receive points based at least in part on identifying the multiple transmit / receive point multiplexing scheme.

20. An apparatus for wireless communication, comprising: processor; a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the apparatus to: generating a first set of bits indicating states of a plurality of transmission configuration indicators for communicating with a user equipment UE; generating, based at least in part on the first set of bits indicating the plurality of transmission configuration indicator states, a second set of bits indicating a set of antenna ports and a multiple transmission / reception point multiplexing scheme from a set of possible multiplexing schemes for multiple transmission / reception point operation, wherein each multiple transmission / reception point multiplexing scheme from the set of possible multiplexing schemes includes joint or individual rate matching implemented for a space division multiplexing scheme, a frequency division multiplexing scheme, a time division multiplexing scheme, or a combination thereof, the individual rate matching indicating a number of transmissions to be used for the plurality of transmission configuration indicator states; as well as A downlink control information message including an indication of the first set of bits and the second set of bits is sent to the UE.

21. The device of claim 20, wherein the instructions are further executable by the processor to cause the device to: A lookup table that maps both the antenna port set and the multiple transmission / reception point multiplexing scheme to the second set of bits is selected from a plurality of lookup tables, wherein the generating the second set of bits is based at least in part on the selection.

22. The device of claim 21, wherein the instructions are further executable by the processor to cause the device to: configuring the lookup table, the plurality of lookup tables, or a combination thereof; and An indication of the lookup table, the plurality of lookup tables, or a combination thereof is sent to the UE.

23. The apparatus of claim 20, wherein the second set of bits further indicates a modulation order of at least one of the plurality of transmission configuration indicator states.

24. The apparatus of claim 20, wherein the second set of bits further indicates a redundancy version of a transport block for at least one of the plurality of transport configuration indicator states.

25. The apparatus of claim 20, wherein the multiple transmission / reception point multiplexing scheme comprises a joint space division multiplexing scheme, a separate space division multiplexing scheme, a joint frequency division multiplexing scheme, a separate frequency division multiplexing scheme, a joint time division multiplexing scheme, a separate time division multiplexing scheme, or a combination thereof.

26. The apparatus of claim 20, wherein the second set of bits includes the same number of bits as a set of bits indicating a set of antenna ports for single transmit / receive point operation.

27. The apparatus according to claim 20, wherein a lookup table mapping both the antenna port set and the multiple transmission / reception point multiplexing scheme to the second bit set is preconfigured in a memory.

28. The apparatus of claim 20, wherein the multiple transmission / reception point operation comprises communicating with the UE through multiple transmission / reception points at a network device or distributed across multiple network devices.

29. An apparatus for wireless communication at a user equipment UE, comprising: processor; a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the apparatus to: receiving, from a network device, a downlink control information message including an indication of a first set of bits and a second set of bits; identifying, using the first set of bits, a plurality of transmission configuration indicator states for communicating with the network device; as well as identifying, based at least in part on the identifying the plurality of transmission configuration indicator states, a set of antenna ports and a multiple transmit / receive point multiplexing scheme from a set of possible multiplexing schemes for multiple transmit / receive point operation using the second set of bits, Each multi-transmit / receive point multiplexing scheme from the set of possible multiplexing schemes includes a joint or individual rate matching implemented for a space division multiplexing scheme, a frequency division multiplexing scheme, a time division multiplexing scheme, or a combination thereof, wherein the individual rate matching indicates the number of transmissions to be used for the multiple transmission configuration indicator states.

30. The device of claim 29, wherein the instructions are further executable by the processor to cause the device to: A lookup table is selected from a plurality of lookup tables that maps the second set of bits to both the antenna port set and the multiple transmission / reception point multiplexing scheme, wherein the identifying the antenna port set and the multiple transmission / reception point multiplexing scheme is based at least in part on the selection.

31. The device of claim 30, wherein the instructions are further executable by the processor to cause the device to: A configuration of the lookup table, the plurality of lookup tables, or a combination thereof is received from the network device.

32. The device of claim 29, wherein the instructions are further executable by the processor to cause the device to: The second set of bits is used to identify a modulation order of at least one transmission configuration indicator state of the plurality of transmission configuration indicator states.

33. The device of claim 29, wherein the instructions are further executable by the processor to cause the device to: The second set of bits is used to identify a redundancy version of a transport block for at least one of the plurality of transmission configuration indicator states.

34. The apparatus of claim 29, wherein the multiple transmission / reception point multiplexing scheme comprises a joint space division multiplexing scheme, a separate space division multiplexing scheme, a joint frequency division multiplexing scheme, a separate frequency division multiplexing scheme, a joint time division multiplexing scheme, a separate time division multiplexing scheme, or a combination thereof.

35. The apparatus of claim 29, wherein the second set of bits includes the same number of bits as a set of bits indicating a set of antenna ports for single transmit / receive point operation.

36. The apparatus according to claim 29, wherein a lookup table mapping the second bit set to both the antenna port set and the multiple transmission / reception point multiplexing scheme is preconfigured in a memory.

37. The apparatus of claim 29, wherein the multiple transmit / receive point operation comprises communicating with a plurality of transmit / receive points at the network device or distributed across a plurality of network devices including at least the network device.

38. The device of claim 37, wherein the instructions are further executable by the processor to cause the device to: A plurality of messages are received from the plurality of transmit / receive points based at least in part on identifying the multiple transmit / receive point multiplexing scheme.

39. An apparatus configured for wireless communication, the apparatus comprising: Means for performing the steps of the method according to any one of claims 1-19.

40. A non-transitory computer readable medium having recorded thereon a program code for wireless communication, the program code comprising: A computer-executable program code to cause the computer to perform the steps of the method according to any one of claims 1 to 19.

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