User equipment and network nodes involved in signal transmission

Abstract

The present invention provides a method and apparatus for transmitting and receiving that facilitates the signaling of a physical downlink control channel (PDCCH) for multi-TRP (transmit / receive point) communication. [Solution] In a communication system, a transceiver (user equipment) performs transmission or reception using one or more transmission parameters. When the configuration indicated by the transmission configuration instruction field corresponds to a single TRP (transmit / receive point), the one or more transmission parameters are determined using a first table. When the configuration indicated by the transmission configuration instruction field corresponds to multiple configurations, the one or more transmission parameters are determined using a second table. The columns constituting the second table are the same as the columns constituting the first table. The number of bits representing the index in the second table is the same as the number of bits representing the index in the first table.

Description

Technical Field

[0001] The present disclosure relates to the transmission and reception of signals in a communication system. In particular, the present disclosure relates to methods and apparatuses for such transmission and reception.

Background Art

[0002] The 3rd Generation Partnership Project (3GPP (registered trademark)) is working on technical specifications for next-generation cellular technology, also known as the 5th Generation (5G), which includes a "New Radio" (NR) radio access technology (RAT) operating in the frequency range up to 100 GHz. NR is a follower of technologies represented by LTE (Long Term Evolution) and LTE-A (LTE Advanced).

[0003] In systems such as LTE and NR, further improvements and options can facilitate the efficient operation not only of specific apparatuses related to the communication system but also of the communication system itself.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

[0005] One non-limiting and exemplary embodiment facilitates the signaling of a physical downlink control channel (PDCCH) for multi-TRP (transmit / receive point) communication.

[0006] One of the primary aspects of this disclosure is: A transceiver transmits downlink control information in a physical downlink control channel, and the downlink control information includes one or more indicators and a transmission configuration instruction field for one or more transmission parameters, A control circuit that determines one or more transmission parameters based on the configuration indicated by one or more indicators and the transmission configuration instruction field, The transceiver performs transmission or reception using the one or more transmission parameters. If the configuration indicated by the transmission configuration instruction field corresponds to a single, then the one or more transmission parameters are determined using the first table. If the configuration indicated by the transmission configuration instruction field corresponds to multiple configurations, one or more transmission parameters are determined using a second table. The columns constituting the second table are the same as the columns constituting the first table. The number of bits representing the index of the second table is the same as the number of bits representing the index of the first table. It is a base station.

[0007] In one general embodiment, the technology disclosed herein is a user device (UE) comprising: a transceiver that, in operation, receives downlink control information (DCI) for scheduling multiple transmissions or receptions between the UE and multiple transmit / receive points (TRPs) on a physical downlink control channel (PDCCH) on multiple channels, wherein the DCI includes one or more indicators indicating one or more transmit parameters; and a circuit that, in operation, obtains multiple values ​​for each of the one or more transmit parameters based on the one or more indicators and configuration, wherein the transceiver, in operation, performs the multiple transmissions or receptions using one of the multiple values ​​of the one or more transmit parameters for each of the multiple transmissions or receptions.

[0008] It should be noted that general or specific embodiments can be implemented as systems, methods, integrated circuits, computer programs, storage media, or any selective combination thereof.

[0009] Further benefits and advantages of the disclosed embodiments will become apparent from this specification and the drawings. These benefits and / or advantages can be obtained individually by some embodiments and features described in the specification and drawings, but not all of them need to be provided in order to obtain one or more of such benefits and / or advantages. [Brief explanation of the drawing]

[0010] The following describes exemplary embodiments in more detail with reference to the attached drawings.

[0011] [Figure 1] A diagram showing an exemplary architecture of a 3GPP NR system, including exemplary user plane and control plane architectures for LTE eNB, gNB, and UE. [Figure 2] An illustrative diagram showing the transmission of two PDSCHs to a single UE. [Figure 3]Exemplary diagram showing a single PDCCH transmission from one TRP scheduling two PDSCH transmissions from two TRPs [Figure 4] Graph showing the configuration of demodulation reference symbols for front-loading on data channels [Figure 5] Block diagram showing the configuration of a UE and a network node [Figure 6] Flowcharts showing a method for a terminal and a method for a network node [Figure 7] Block diagram showing an exemplary configuration of a parameter acquisition circuit of a UE [Figure 8] Block diagram showing an exemplary configuration of a parameter acquisition circuit of a UE [Figure 9] Diagram showing an example of an RRC code including values of a multi-TRP combination table [Figure 10] Diagram showing an example of an RRC code including values of a multi-TRP combination table for DMRS indication [Figure 11] Diagram showing an example of an RRC code including values of a multi-TRP combination table for TCI state indication [Figure 12] Diagram showing an example of an RRC code including activation parameters of a multi-TRP combination table [Figure 13] Diagram showing an example of an RRC code including activation parameters of a multi-TRP combination table for DMRS indication [Figure 14] Diagram showing an example of an RRC code including activation parameters of a multi-TRP combination table for TCI state indication

Mode for Carrying Out the Invention

[0012] FIG. 1 shows an exemplary example of a communication system including a base station, a terminal, and a core network. Such a communication system may be a 3GPP system such as NR and / or LTE and / or UMTS. For example, as shown in FIG. 1, the base station (BS) may be a gNB (gNodeB, e.g., NR gNB) or an eNB (eNodeB, e.g., LTE gNB). However, the present disclosure is not limited to these 3GPP systems or any other systems. Embodiments and exemplary implementations are described using some terms of 3GPP systems, but the present disclosure is applicable to any other communication system, particularly any cellular system, wireless system, and / or mobile communication system.

[0013] In NR, for example, it is planned to facilitate the provision of a single technical framework to address several defined usage scenarios, requirements, and deployment scenarios, including, for example, enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine type communications (mMTC). For example, eMBB deployment scenarios can include indoor hotspots, dense urban areas, rural areas, urban macro areas, and highways. URLLC deployment scenarios can include industrial control systems, mobile healthcare (remote monitoring / diagnosis / treatment), real-time control of vehicles, and wide-area monitoring / control systems for smart grids. mMTC can include scenarios with a large number of devices involving non-time-critical data transfer, such as smart wearables and sensor networks. The eMBB and URLLC services are similar in that both require a very wide bandwidth, but differ in that the URLLC service requires ultra-low latency. In NR, the physical layer is based on time-frequency resources (such as orthogonal frequency division multiplexing (OFDM) similar to LTE) and can support multi-antenna operation.

[0014] In LTE and NR, the terminal is called the user device (UE). This may be a mobile device such as a cell phone, smartphone, tablet computer, or USB (Universal Serial Bus) stick with user device functionality. However, the term mobile device is not limited to this; generally, a relay may have the functionality of such a mobile device, and a mobile device may function as a relay.

[0015] A base station is, for example, a network node that forms part of a network to provide services to terminals. A base station is a network node that provides wireless connectivity to terminals.

[0016] The physical layer in NR can provide multi-antenna operation, such as MIMO (Multiple Input, Multiple Output), which can include the use of multiple or numerous transmit / receive points (multi-TRPs). For example, user equipment can receive data from multiple TRPs, and these TRPs can be controlled by the same or different network nodes. The terms multipoint transmission or Coordinated Multipoint Transmission (CoMP) can also be used for multi-TRP communication, including multi-TRP transmission.

[0017] In NR Rel. 15, 3GPP specified basic support for multiple transmit / receive points (multi-TRP). In NR Rel. 16, multi-TRP can be further enhanced in accordance with new work items related to NR MIMO (see Non-Patent Document 1).

[0018] This disclosure deals with multi-TRP communication and proposes, for example, techniques for transmission over a single PDCCH (Physical Downlink Control Channel). A single PDCCH is used to schedule data channels or control channels, such as PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel), for multiple TRPs. Some discussed techniques involve mapping demodulation reference signal (DMRS) ports to multiple layers for transmission over multiple TRPs and relating to DMRS port indication tables for mapping transmission configuration indication (TCI) state signaling for multiple TRPs. Signaling modifications related to both DMRS port indications and TCI states via a single PDCCH for multi-TRP transmission / reception of data channels are described.

[0019] As described above, this disclosure is applicable to the area of ​​multi-TRP in MIMO. Multi-TRP involves sending and receiving with multiple points connected to each other by ideal or non-ideal backhaul, as described in more detail below, in order to coordinate the transmission and / or reception to some extent.

[0020] The techniques described herein are not limited to any particular arrangement of TRPs or any particular relationship between TRPs and gNBs. For example, multi-TRP operation may be performed by a gNB having different antenna panels or radio heads corresponding to the TRPs and different radio frequency units operating with each antenna.

[0021] Furthermore, in a multi-TRP configuration, several options are possible regarding the spatial relationship between TRPs, and the distances between two TRPs may differ. For example, TRPs may be close together, in which case the UE receives signals from these TRPs at similar angles. However, TRPs may also be quite far apart from each other, for example, in distant locations within a network cell. A UE served by two TRPs can receive or transmit signaling from each TRP on an uncorrelated channel. Thus, the gain of channel diversity can be optimally utilized.

[0022] For example, multi-TRPs can be classified into two high-level categories. That is, the distinction between categories can be made with respect to the backhaul type of the backhaul link between two given TRPs. On the one hand, an ideal backhaul is a backhaul with very high throughput and very low latency, such as a dedicated point-to-point connection using optical fiber. An ideal backhaul is assumed to enable communication between TRPs with a latency of about 0 milliseconds or nearly 0 milliseconds (for example, in the case of LTE-A, Non-Patent Literature 2, a technical report, mentions a unidirectional latency of less than 2.5 microseconds in section 6.1.3, but does not include propagation delay in fiber / cable). On the other hand, a non-ideal backhaul is a backhaul such as DSL (Digital Subscriber Line), microwave, or other backhauls such as relay, which may have a finite (unidirectional) latency in the range of 2 milliseconds or 5 milliseconds for communication between the two given TRPs mentioned above.

[0023] Apart from categorizing backhaul into ideal and non-ideal backhaul, further categorization is possible in multi-TRP MIMO technology regarding how baseband circuits are shared between TRPs. For example, two given TRPs may each have different RF (radio frequency) blocks, while these TRPs may share the same baseband circuit. In this case, the link / backhaul between the RF block and the baseband circuit may be ideal or non-ideal. Alternatively, both the baseband and RF blocks may be different for each TRP. In this case, not only the links between the baseband circuits and RF blocks, but also the links between different baseband circuits may be ideal or non-ideal.

[0024] This disclosure provides an approach that can facilitate multi-TRP operation, and in particular, facilitate the achievement of reliability and robustness. The disclosed technology can facilitate meeting URLLC requirements by, for example, utilizing multi-TRP communication, but is not limited to URLLC use cases. For example, the disclosed technology can also be applied to eMBB and mMTC use cases. This disclosure is applicable to scenarios involving either or both ideal and non-ideal backhauls.

[0025] As described above, multiple distant TRPs can enable the provision of spatial diversity gain. In particular, by utilizing this spatial diversity gain, transmission and reception can be facilitated in the high-frequency range where interruption to either the link or the radio communication channel between the TRP and the UE is particularly possible. From this perspective, the technology disclosed herein can facilitate coordination between multiple points, such as TRPs, to schedule control channels and / or data channels.

[0026] Figure 2 shows an example of multi-TRP communication. Here, multiple physical downlink data channels are transmitted from two TRPs (for example, connected by an ideal backhaul) to a single UE.

[0027] Depending on the type of backhaul link between TRPs, and whether each TRP has its own control channel (PDCCH / PUCCH) and / or data channel (PDSCH / PUSCH), different transmission modes may exist for multiple TRPs.

[0028] According to some agreements in RAN1#94b and RAN#95, different alternatives are being considered for single and / or multi-PDCCH transmission over multi-TRP transmission, and it has been agreed to down-select from the following options: supporting only single-PDCCH design (in which case multi-PDCCH design is additionally available), supporting only multi-PDCCH design (in which case single-PDCCH design is additionally available), and supporting both multi-PDCCH and single-PDCCH designs. Further options may include URLLC-specific PDCCH designs, possibly including specific PDCCH configurations / formats or transmission schemes. Points to consider in the above down-selection may include backhaul latency, downlink control overhead, spec impact (including RAN2 specs), UE complexity (regarding power control, timing adjustment, and blind detection), DCI / UCI design, scheduler flexibility, in-UE PUCCH / PUSCH transmission, Rel-15 PDCCH blockage probability, and CSI feedback.

[0029] This disclosure is applicable to single PDCCH transmissions in a multi-TRP environment. However, a PDCCH can schedule PDSCH / PUSCH / PUCCH for multiple TRPs, for example. As shown in Figure 3, a single PDCCH (single DCI content) schedules each PDSCH (carrying their respective codewords) transmitted from TRP1 to the UE and from TRP1 and TRP2 to the UE. This means that a single DCI content within a single PDCCH applies to downlink data transmissions from both TRPs. Thus, one PDCCH transmitted from one of the TRPs schedules different codewords (different PDCCHs). For example, each codeword transmitted to or received by two or more TRPs may be different or identical (for example, to facilitate obtaining spatial diversity gain). Furthermore, different layers of the same codeword may be transmitted from multiple TRPs.

[0030] NR Rel.15 specified different DMRS (Demodulated Reference Signals) configurations for PDSCH / PUSCH. These are called front-loaded DMRS because they occupy the first one or two symbols of a data channel, for example, the first one or more symbols of a slot. In particular, DMRS configuration types 1 and 2 were specified. Each configuration has both 1-symbol and 2-symbol configurations. Thus, four different DMRS patterns were specified, as shown in Figure 4. Furthermore, additional time-domain patterns with additional DMRS symbols are also specified.

[0031] A reference signal pattern (RS) is transmitted from the base station's antenna port (or port or DMRS port). The port can be implemented as a single physical transmitting antenna (or TRP) or as a combination of multiple physical antenna elements. In either case, the signals transmitted from each antenna port are not designed to be further decomposed by the UE's receiver. The transmitted RS (in particular the demodulation reference signal) corresponding to a given antenna port defines the antenna port from the UE's perspective, enabling the UE to derive channel estimates for all data transmitted through that antenna port, regardless of whether the antenna port represents a single radio channel from one physical antenna or a composite channel from multiple physical antenna elements that together constitute the antenna port. See also Section 8.2 of Non-Patent Document 3 for more information on ports.

[0032] Different ports can be distinguished from one another by resource components such as cyclic shifts, combs (combs define subcarrier distinctions, with subcarriers having alternating subcarrier indices grouped into different combs), and orthogonal cover codes (OCCs). As can be seen in Figure 4, ports are divided into CDM (Sign Division Multiplexing) groups. Each CDM group uses its own OCC (e.g., Walsh-Hadamard TD (Time Division Multiplexing) OCC for 2-symbol DMRS). Resource components can be combined to form component sets, and these component sets can be assigned to ports.

[0033] All DMRS ports within the same CDM group can be assumed to be quasi-co-located (QCL). That is, similar assumptions are made regarding channel correlations between DMRS ports with respect to, for example, Doppler shift, Doppler spread, mean delay, and delay spread.

[0034] When a data channel transmission is scheduled, for example, a PDSCH is scheduled, and one or more layers are scheduled. The term spatial layer (or layer) refers to one of the different streams generated by spatial multiplexing. A layer can be described as a mapping of symbols to the transmitting antenna ports. Each layer is identified by a precoding vector whose size is equal to the number of transmitting antenna ports and can be associated with a radiation pattern. The rank of a transmission is the number of layers transmitted. A codeword is an independently encoded data block, corresponding to a single transport block (TB) passed from the transmitter's Medium Access Control (MAC) layer to the physical layer, and is protected by a cyclic redundancy check (CRC). Typically, layers are assigned per transmission time interval (TTI) corresponding to a subframe in LTE. However, in NR, different TTIs can exist depending on whether URLLC or eMBB is used. In particular, in NR, a TTI can be a slot, a minislot, or a subframe. For information on layers, ranks, and codewords, please also refer to section 11.2.2.2 of Non-Patent Document 3.

[0035] Generally, TTI determines the timing granularity for scheduling assignments. One TTI is the time interval at which a given signal is mapped to the physical layer. For example, conventionally, the TTI length can vary from 14 symbols (slot-based scheduling) to 2 symbols (non-slot-based scheduling). Downlink and uplink transmissions are specified to be organized into frames (10 milliseconds in duration) consisting of 10 subframes (1 millisecond in duration). In slot-based transmissions, the subframes are instead divided into slots. The number of slots is defined by the neurology / subcarrier interval. The specified values ​​range from 10 slots for a 15 kHz subcarrier interval to 320 slots for a 240 kHz subcarrier interval. The number of OFDM symbols per slot is typically 14 for cyclic prefixes and 12 for extended cyclic prefixes (see Non-Patent Literature 4, Sections 4.1 (General Frame Configuration), 4.2 (Numerology), 4.3.1 (Frames and Subframes), and 4.3.2 (Slots)). However, the allocation of time resources for transmission may be non-slot-based. In particular, TTI in non-slot-based allocation may correspond to minislots rather than slots. That is, one or more minislots may be allocated to the requested transmission of data / control signaling. In non-slot-based allocation, the minimum length of TTI may conventionally be 2 OFDM symbols.

[0036] The layers are mapped to DMRS port numbers using the port indication table specified in Chapter 7 of Non-Patent Document 5. For example, DCI formats 1-1 and 0-1 are used for scheduling PDSCH and PUSCH, respectively. Each of these formats includes a field called “antenna port” which is used to indicate the above table for layer-to-port mapping. The NR Rel. 15 specification for layer-to-port mapping assumes a single TRP transmission. This means that the above table includes entries where DMRS ports within the same CDM group are mapped to multiple layers for transmission on a single TRP. When this mapping is applied to multi-TRP transmissions, for example, if layer 1 is transmitted on TRP1 and layer 2 is transmitted on TRP2, the DMRS port mapping for these two layers is such that it is assumed that both ports are QCLs. This type of mapping is applicable to a single TRP or multiple TRPs that are close enough to each other, since multiple DMRS ports can be assumed to be QCLs.

[0037] However, if multiple TRPs are located quite far apart from each other and multiple layers are transmitted over different TRPs, this disclosure proposes that the DMRS ports assigned to these layers are not QCL due to the different geographical locations of the TRPs, i.e., they are not within the same CDM group. Therefore, a new table with modified or added entries can facilitate support for non-QCL DMRS port-to-layer mapping to multiple TRPs. Several other possible signaling modifications can further facilitate scheduling over a single PDCCH.

[0038] The DCI format 1-1 used for scheduling PDSCH (Section 7.3.1.2.2 of Non-Patent Literature 5) includes a field called a transmission configuration indication (TCI). This TCI, if configured, uses 3 bits to indicate one of eight TCI states. The UE can configure a list of up to M TCI states in the configuration within the PDSCH-Config, which is a higher layer (in this context, higher layer means a layer higher than the physical layer) parameter configured in the RRC (Radio Resource Control) signaling (in the example of DCI format 1-1 above, M=8, corresponding to the maximum number of 3 bits in the TCI field). Each TCI state includes parameters for configuring a quasi-identical positional relationship between one or two downlink reference signals and the DM-RS ports of the PDSCH. Further information on different QCL types and other related information can be found in Section 5.1.5 of Non-Patent Literature 5. Therefore, a single PDCCH (single DCI) has up to 3 bits for TCI signaling to indicate one of eight configured states, signaling a QCL assumption for one TRP and assuming the same QCL assumption for other TRPs scheduled by that PDCCH. With such QCL assumptions, the TCI state information signaled by the DCI is applicable, in particular, to single TRP transmissions, because the same QCL association may not be valid for one of several different TRPs located far apart from each other. With some modifications, it is possible to facilitate the support of independent TCI state signaling for multiple TRPs using a single PDCCH. For example, geographically separated TRPs should have different QCL assumptions, and therefore independent TCI state signaling for each TRP.

[0039] As shown in Figure 5, the Disclosure provides a user device 510 having a transceiver 520 (receiver / transmitter) and a circuit 530 (processing circuit). The transceiver 520 (or “UE transceiver”) receives downlink control information (DCI) on the PDCCH during operation to schedule multiple transmits or receives between the UE and multiple transmit / receive points (TRPs, e.g., TRP1 and TRP2 shown in Figures 2 and 3) on multiple channels. The DCI includes one or more indicators, each indicating one or more transmit parameters. The circuit 530 (or “UE circuit,” which may include a transmit parameter acquisition circuit 535) during operation acquires multiple values ​​for each of the one or more transmit parameters based on the one or more indicators and configuration. The UE transceiver 520 performs the multiple transmits or receives using one of the multiple values ​​of the one or more transmit parameters for each of the multiple transmits or receives.

[0040] A network node 560 having a transceiver 570 and a circuit 580 is also provided, and is shown in Figure 5. The circuit 580 (or “Network Node Circuit,” which may include a Transmit Parameter Determination Circuit 585) determines, during operation, multiple values ​​for each of one or more transmit parameters for multiple transmits or receives between multiple transmit / receive points (TRPs) and user equipment (UEs), and generates downlink control information (DCI) for scheduling the multiple transmits or receives. The DCI includes one or more indicators that each of the one or more transmit parameters, and the one or more indicators, in combination with a configuration, indicate the multiple values ​​for each of the one or more transmit parameters. The network node transceiver 570 transmits the DCI on the PDCCH during operation.

[0041] As shown in Figure 5, the UE510 and the network node 560 communicate with each other via at least one communication channel, such as a wireless channel or radio channel in a wireless communication system, such as NR, LTE, or LTE-A.

[0042] The transceivers (UE transceiver 520 and network node transceiver 570) include one or more hardware components, such as antennas, and software that controls the transmission and / or reception performed by this hardware.

[0043] This disclosure further provides a communication method for user equipment ("UE method") and a communication method for network nodes ("network node method") corresponding to the UE and network nodes described above. Figure 6 shows the method steps of the UE method and the network node method.

[0044] Step S610 of the network node method determines multiple values ​​for each of one or more transmission parameters for multiple transmissions or receptions between multiple transmission / reception points (TRPs) and user equipment (UE). Step S620 of the network node method generates downlink control information (DCI) for scheduling the multiple transmissions or receptions. The DCI includes one or more indicators, each representing one or more transmission parameters, and these indicators, in combination with a configuration, represent multiple values ​​for each of the one or more transmission parameters. Furthermore, in step S630, the DCI is transmitted on the PDCCH and received on the UE side in step S635 of the UE method. In step S645 of the UE method, the multiple values ​​for each of the one or more transmission parameters are obtained based on the one or more indicators and the configuration. In step S655 of the UE method, the multiple transmissions or receptions are performed using one of the multiple values ​​for each of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0045] The technology disclosed herein facilitates signaling of individual DMRS port-to-layer mapping and TCI status for multiple TRPs using a single PDCCH. For example, it facilitates not increasing (or significantly increasing) DCI overhead as the number of TRPs increases. It also facilitates the reuse of technology from existing specifications. Furthermore, the disclosed technology facilitates scalability and flexibility to consider a large number of possible TRPs. In addition, it facilitates URLLC communication.

[0046] The following provides details and embodiments of the apparatus and corresponding methods described above.

[0047] As described above, the transmission (network node) and reception (UE) of DCI in a PDCCH may be a single PDCCH in multi-TRP communication. For example, this PDCCH schedules multiple transmit / receive operations. Each of these transmit / receive operations is performed on one of multiple channels using one of multiple TRPs.

[0048] A DCI includes one or more indicators, each of which indicates one or more transmit parameters. In particular, the transmit parameters may be QCL-related transmit parameters. For example, a DCI may include one or both of the above parameters (TCI and configuration indices from the DMRS port instruction table), and the values ​​of one or more of these parameters may be determined (network node) and retrieved (UE).

[0049] Each value of one or more transmission parameters can be obtained or derived based on one or more transmission parameters. For example, one or more of the values ​​can be obtained from the combination of configurations and parameters in the DCI that correspond to each of those values. Furthermore, the configuration can be a combination of a statically configured portion (which can be defined by the standard) and a "semi-statically" configured portion consisting of higher-layer signaling such as RRC signaling. For example, a semi-statically signaled configuration (or part of a configuration) may include elements or parameters that enable the use of a "multi-TRP" configuration provided by that configuration, in addition to a "single-TRP" configuration.

[0050] A single TRP configuration may include one or more port instruction tables, such as the above configuration of TCI state variables or the port instruction table defined in Chapter 7 of Non-Patent Document 5, which may be called the single TRP configuration table. A multi-TRP configuration may include further port instruction tables, for example, tables designed for use in multi-TRP combinations. These additional tables may be included in the static configuration or may be signaled by RRC.

[0051] There are several possible combinations of configurations and parameters included in the DCI. For example, a multi-TRP configuration may provide additional pointers or parameters to a single-TRP configuration, which can be included in additionally configured tables. Furthermore, for example, the interpretation of parameters in the DCI may be determined based on the activation parameters or RNTI (Radio Network Temporary Identifier) ​​included in the configuration. Based on the activation parameters or RNTI (e.g., a specific RNTI among several configured RNTIs) used to scramble (Network Node) / descramble (UE) the CRC attached to the DCI, the UE determines the value of one (e.g., single-TRP) or multiple (multi-TRP) parameters according to the single-TRP configuration, multi-TRP configuration, or a combination of single-TRP and multi-TRP configurations (e.g., multiple pointers to a single-TRP configuration).

[0052] During operation, the UE transceiver 520 performs multiple transmits and receives with multiple TRPs by using the respective values ​​of the transmit parameters for each of the multiple transmits, or for at least two of the multiple transmits. For example, the UE uses a different TCI status value for each TRP. Furthermore, as an example, the UE can use different DMRS port indication values ​​for transmits and receives with each of the multiple TRPs. The respective values ​​of the transmit parameters (e.g., DMRS port indication and / or TCI status) for different TRPs may have different QCL assumptions.

[0053] Multiple transmissions and receptions with multiple TRPs may involve the transmission of the same data / codeword or different data / codewords. For example, the two codewords being transmitted or received may be the same or different. Furthermore, the same data may be transmitted / received using the same MCS (Modulation and Encoding Scheme) and / or redundant version, or using different MCS (Modulation and Encoding Scheme) and / or redundant versions. Additionally, different layers of a single codeword may be transmitted and received with different TRPs.

[0054] Multiple transmissions or receptions may involve uplink or downlink transmissions / receptions of data or control information over channels such as PDSCH, PUSCH, or PUCCH. For example, a UE may transmit data and / or control information to multiple TRPs, or multiple TRPs may transmit data and / or control information to a UE.

[0055] For example, multiple transmits or receive events scheduled by DCI may be uplink transmits from a UE to multiple TRPs, or multiple transmits may be downlink transmits from multiple TRPs to a UE. Furthermore, multiple transmits / receive events scheduled by DCI may include one or more uplink transmits and one or more downlink transmits.

[0056] As described above, multi-TRP communication can include cases where each TRP has its own RF block and baseband circuit, or where a single baseband circuit is shared among multiple TRPs, each having its own RF block. Therefore, network node 560 includes one or more TRPs. For example, network node transceiver 570 includes one or more TRPs. However, multiple TRPs may also include TRPs that are not included in network node 560. For example, a network node can determine the value of a transmit parameter and transmit this value to another baseband circuit, possibly included in another network node, via an ideal or non-ideal backhaul link. Alternatively, a network node may determine the transmit parameter by receiving control information from another network node / baseband circuit via an ideal or non-ideal backhaul link.

[0057] Therefore, in some embodiments, the network node transceiver 570 performs at least one of a plurality of transmit or receive operations using, during operation, one of each of a plurality of values ​​of one or more transmit parameters for each of a plurality of transmit or receive operations. At least one transmit or receive operation is performed between the UE and at least one of the plurality of TRPs. Therefore, in these embodiments, the network node method further includes a transmit / receive step S660 that performs at least one (one, multiple, or each) of the plurality of transmit operations. In this case, one, multiple, or each of the plurality of TRPs is used, respectively.

[0058] As described above, in some embodiments, one or more transmit parameters include at least one of the DMRS (Demodulation Reference Signal), port indication, and transmit configuration indication (TCI) state. Furthermore, this disclosure provides several embodiments involving RNTI, various elements such as enable parameters in RRC signaling, RRC signalable or statically configurable combination tables, and combinations of these elements. Some embodiments are described in further detail below.

[0059] RNTI's embodiment

[0060] In some embodiments, the configuration includes an RNTI, or the RNTI is derivable from the configuration. The RNTI is used by network nodes to scramble the CRC (Cyclic Redundancy Check) attached to the DCI. During operation, the UE circuit 530 uses the RNTI to descramble the CRC attached to the DCI. The RNTI, alone or in combination with one of the indicators in DCI signaling, indicates at least one of several values ​​of the transmission parameter.

[0061] For example, an RNTI (in particular, a numerical value of the RNTI) can correspond to a value of a transmit parameter. For example, there is a mapping between possible numerical values ​​of the RNTI, and at least one numerical value can be configured statically or in RRC signaling. The DCI field of the same parameter can be used for the parameter value of a first transmit / receive with a first TRP, while the value indicated by the RNTI is the parameter value of a second transmit / receive with a second TRP. Additionally or alternatively, the RNTI can indicate that for the same or a different transmit parameter, the corresponding field in the DCI should be interpreted as a single value representing multiple (e.g., two) values ​​of a transmit parameter for multiple transmit / receives across multiple TRPs. The mapping between a value in the DCI and multiple values ​​can be defined by a combination table included in the configuration.

[0062] Accordingly, this disclosure provides several embodiments based on an RNTI-based approach. In particular, there are several possibilities regarding which RNTI may be used. For example, a new UE-specific RNTI may be introduced for multi-TRP-specific signaling, or a UE-specific RNTI that already provides a certain function, such as MCS-C-RNTI (MCS Cell RNTI), may be extended in terms of functionality to further demonstrate multi-TRP-specific signaling.

[0063] The RNTI-based embodiments of this disclosure can be implemented without additional DCI overhead. Rather than including different values ​​for a given transmission parameter in the DCI, additional values ​​for a given parameter can be obtained from the RNTI or from a table pointed to by the RNTI. At the same time, independent instructions for different TRPs can be facilitated. Furthermore, since the RNTI can be an indicator for DMRS port instructions, TCI status instructions, issuance of both, or several additional fields, a unified approach to the individual signaling being issued (e.g., DMRS and TCI signaling) is provided.

[0064] For example, a new UE-specific RNTI can be configured by RRC, or an existing RNTI such as MCS-C-RNTI can be reused, providing additional functionality such as those shown below. - Scrambling with the new RNTI implicitly indicates the use of a different DMRS port instruction table for multi-TRP (e.g., a different multi-TRP DMRS port instruction table than the single-TRP DMRS port instruction table), and / or - Indicates the TCI status of additional TRPs (e.g., TRPs not used for PDCCH transmission) using specific RNTI values ​​that scramble DCI CRC (CRC appended to DCI), in which case two or more values ​​can be configured (or derived from configured or existing RNTIs) for a new RNTI or an existing RNTI, and has extended functionality.

[0065] A multi-TRP table (for example, a DMRS port instruction table designed and specified for multi-TRP cases) can be defined by a standard.

[0066] A communication method using an RNTI-based approach for multi-TRP instructions may include the following exemplary steps: 1. If RRC does not configure a new RNTI and does not extend an existing RNTI (e.g., does not define additional functionality), it will follow existing processes, for example, using the existing signaling framework (e.g., the process used for single TRP communication, possibly including a single TRP DMRS port instruction table). 2. If the RRC sets up this new RNTI or uses an extension of an existing RNTI, further steps will be taken based on the results of the DCI CRC descramble. 3. If DCI CRC is not scrambled with this RNTI, follow the existing process, for example, use the existing signaling framework. 4. If the DCI CRC is scrambled with one possible value for this RNTI, follow these steps: a. Use a new DMRS port mapping table. b. During descrambling, the UE identifies the RNTI value used for scrambling and calculates the TCI state of the second TRP (which is different from the first TRP whose DCI was signaled by the PDCCH). c. The TCI state of the first TRP is signaled by an existing bit field (one of the indicators) included in the DCI.

[0067] However, as will be further described in some exemplary embodiments, step a may be taken alone, independently of steps b and c. Also, steps b and c may be performed without step a. In particular, steps 1-4 above of the multi-TRP communication method may vary depending on whether the multi-TRP RNTI is used to i) indicate a new DMRS table for multi-TRP, ii) indicate two or more TCI status values ​​for two TRPs or multi-TRP, or iii) indicate a new DMRS table for multi-TRP. In cases i) and iii), the use of an existing framework includes the use of a single-TRP DMRS port indicator table. Also, in case i), step 4 includes step a; in case ii), step 4 includes steps b and c; and in case iii), step 4 includes steps a-c. Furthermore, as described above, the RNTI is a dedicated RNTI or a predetermined RNTI extended by configured multi-TRP functionality. In cases ii) and iii), the K candidate RNTI values ​​can be set or derived from configuration, as will be further described.

[0068] This disclosure is not limited to which type of indicator (DCI bitfield or RNTI) is applied to which TRP. For example, contrary to the above description, the TCI bitfield may be applied to a TRP that does not transmit PDCCH (such as the second TRP described above). Figure 7 shows an exemplary configuration of a parameter acquisition circuit 535, which includes a descramble circuit 736 and at least one of a table selection circuit 737 and a TCI state acquisition circuit 738.

[0069] In some embodiments, the RNTI is used to indicate a DMRS table for multi-TRP communication. In this case, the configuration includes a first DMRS port indication table and a second DMRS port indication table. During operation, the UE circuit 530 descrambles the cyclic redundancy check (CRC) appended to the DCI using the Radio Network Temporary Identifier (RNTI), which is included in or derivable from the configuration. The RNTI indicates that the second DMRS port indication table is used for at least one of a plurality of transmits or receives. During operation, the UE transceiver 520 uses the second DMRS port indication table to perform at least one of the plurality of transmits or receives, according to the result of successfully descrambling the CRC using the RNTI. An indicator shows the DMRS port indication from the second DMRS port indication table.

[0070] Table 1 is an exemplary DMRS port specification table usable for multi-TRP communication in the case of a Type 1 DMRS configuration and 1 symbol length. Thus, while Table 1 is an example of the second DMRS port specification table (or "multi-TRP port specification table") described above, the first DMRS port specification table may be a "single-TRP" DMRS port specification table as described above. As can be seen from Figure 4, ports 0 and 1 are QCLs (because they are in the same CDM group), and ports 2 and 3 are also QCLs. The column "Number of DMRS CDM Groups Without Data" indicates the number of CDM groups to which a reference signal (not data) is signaled, or the number of CDM groups occupied by another UE for DMRS transmission / reception (and therefore without data for the given user equipment under consideration).

[0071] [Table 1]

[0072] The column values ​​contain the index of a different row corresponding to the DMRS configuration. The DMRS configuration from the row is dynamically scheduled to the UE by a 4-bit field in the DCI. Thus, the DMRS port instruction is one of several transmit parameters on which multiple transmit or receive operations are performed. This 4-bit field is an indicator showing one of the indices corresponding to the "Value" column that shows the DMRS port instruction from the table.

[0073] Therefore, according to the results of successfully descrambling the CRC, the DMRS port indicators used for multiple transmissions or receptions are derived from the second DMRS port indicator table, rather than the first DMRS port indicator table, if the RNTI used for the descrambling is an RNTI with multi-TRP capabilities. In this case, the DCI indicators will show entries from the "Value" column of the second DMRS port indicator table, rather than the first DMRS port indicator table, and the values ​​will correspond to multiple ports, including multiple non-QCL ports, each assigned to multiple TRPs, as defined in each row of the "DMRS Port" column.

[0074] Table 1 also shows the case where only one codeword (codeword 1) is enabled. In this case, different layers of the codeword are sent and received with different TRPs. Rows indicated by values ​​7-12 (entries 7-12) are available for multi-TRP transmission or reception. Rows 7 and 8 show the port combinations (0,2) and (0,3), both of which are non-QCL and therefore can be used for transmission using two ports. Entries 10-12 each indicate combinations that include at least two QCL ports. If these combinations are for three layers (entries 10, 11) or four layers (entry 12), QCL ports are mapped to the same TRP, while ports belonging to different CDM groups are mapped to different TRPs.

[0075] However, Table 1 is an example, and this disclosure can be applied using different DMRS port instruction tables. For example, two or more codewords can be enabled. In this case, layers of different codewords can be mapped to different TRPs.

[0076] As described above, instead of or in combination with the aforementioned derivation of the DMRS port indicator value, the result of successfully descrambling the RNTI can be used to indicate the transmit or receive TCI status with one of several TRPs.

[0077] In some embodiments, the indicator included in the DCI indicates a first value from among multiple values ​​of the TCI state. The RNTI is one of K RNTI candidates, the first of which is included in the configuration, and the RNTI candidate is a sequence of K integers each representing one of the K configured TCI states signaled by the Radio Resource Control (RRC). During operation, the UE circuit 530 determines a first value of the TCI state based on the indicator and uses the RNTI candidate representing the TCI state to be used as the second value from among the K TCI states as the RNTI, and obtains a second value from among multiple values ​​of the TCI state based on the result of successfully descrambling the CRC attached to the DCI.

[0078] In embodiments where the RNTI indicates a TCI state for transmission, the RNTI may or may not additionally indicate the use of a second DMRS port table, as described above.

[0079] An RNTI is one of K candidates (where K is an integer). Since there are K possible values ​​that an RNTI can take (which the network node circuit 580 can use to scramble the DCI CRC), multiple RNTI candidates can be thought of as an RNTI with multiple values, or an RNTI composed of two or more values. The TCI state value for sending and receiving with the second TRP is determined based on the mapping between the candidate values ​​of the RNTI and the (RRC) set TCI state.

[0080] If the RNTI consists of two or more values, the index or parameter value of the second TCI state for the transmit / receive point TRP2 can be calculated as follows, while the TCI state value for the transmit / receive point TRP1 is indicated by the indicator (bit field or bitmap) included in the DCI. In the following description, we assume that K is equal to 8, but the value of K may generally be greater than 8 (e.g., 16) or less than 8 (e.g., 4), and may change over time according to the RRC configuration. - The DCI CRC is scrambled by the network node circuit 580 with one of these eight values ​​(for example, a value of 5). The eight values ​​constitute multiple K RNTI candidates. - The UE receives the DCI and begins descrambling the CRC sequentially with values ​​such as 1, 2, 3, etc., until it successfully descrambles the CRC using one of the aforementioned values ​​(for example, a value of 5). - The UE successfully descrambles the CRC with a value of 5, and then performs a modulo function between values ​​such as 5 and 8 (performing a 5 mod 8 operation) to determine a value that indicates the TCI state for sending and receiving with TRP2. - The result of the mod function shows the TCI state from the RRC configuration TCI state of TRP2.

[0081] In the above description, RNTI candidates are mapped to TCI state values ​​by the modulo function. However, other functions or operations may be applied to determine the mapping between RNTIs and their respective TCI states. For example, a counter that is incremented each time a DCI CRC is attempted may be used by the UE.

[0082] Furthermore, as described above, if none of the multi-TRP RNTI candidates can successfully descramble the CRC, another, possibly non-multi-TRP related process can be followed. For example, the DCI CRC can be scrambled by a network node using another configured non-multi-TRP related RNTI, such as a C-RNTI without additional multi-TRP capabilities ("non-multi-TRP-RNTI"). Thus, on the UE side, transceiver 520 can perform one or more further attempts to descramble the DCI using a non-multi-TRP RNTI. Attempts to descramble using multi-TRP RNTI candidates can be performed before, or after, the attempts using non-multi-TRP RNTIs, if necessary. Using a multi-TRP RNTI candidate first can facilitate prioritizing TRP communications, for example, if channel characteristics are so important that multi-TRP transmissions are frequently required. On the other hand, using a non-multi-TRP RNTI first can facilitate accelerating processing or reducing the required processing when single-TRP communication is likely.

[0083] The following describes how to configure multiple RNTI candidates. It may be sufficient for only the first RNTI value (or RNTI candidate) to be signaled to the UE by the RRC. The UE can assume that K subsequent digits (e.g., integers) of the RNTI value also belong to a candidate set consisting of such multi-value RNTIs or K RNTI candidates, and can be used to scramble the RNTI on the network node side (multi-TRP RNTI or possibly enhanced C-RNTI). The exact number of the value of K depends on the number of TCI states configured by dynamic or semi-static instructions (in the RRC). From the total number of TCI states (e.g., 128 from the standard) included in the quiescent configuration, the network node selects, for example, 8 states and signals these 8 states to the UE by the RRC. 8 may correspond to the maximum number of RRC configurable TCI states corresponding to the size of the bit field of the DCI (e.g., 3 bits). For example, in the case of one additional TRP, the number of RNTIs K may be equal to 8. Therefore, the RNTI that can be derived from the configuration includes the case where the RNTI used to scramble or successfully descramble the DCI CRC is one of K adjacent / successive or other related integer values, e.g., integer values ​​obtainable / derivable from the initial RNTI signaled in the RRC configuration by numerical operations such as increment or decrement.

[0084] However, the K RNTI candidates can also represent multiple values ​​of TCI states for, for example, a second TRP (TRP3) and a third TRP (TRP3). Therefore, if four states are set in the RRC rather than the maximum number of allowed states of eight, each of the 16 RNTI candidates can be mapped to each combination of TCI states for TRP2 and TRP3.

[0085] According to some embodiments, at least one of the DCI and RNTI indicators indicates a multi-TRP TCI state. The multi-TRP TCI state includes two or more TCI states for each transmission and reception with two or more TRPs.

[0086] For example, a multi-TRP state may be a combination of the respective TCI states for multiple TRPs, such as TRP2 and TRP3, as described above.

[0087] In another example, steps 1-4 above, or similar steps, are performed, and the TCI state index (TCI transmission parameters included in DCI) contains information about two or more TRPs. Here, the TCI states signaled by RRC may be set differently.

[0088] For example, a TCI index corresponding to a TCI status transmission parameter may be configured to indicate TCI status information for two or more TRPs. This may lead to an increase in the number of indices, and for example, the DCI field of a TCI instruction may or may not be redefined to have four or more bits. In general, the exact number of multi-TRP TCI states to be set may depend on the scenario (e.g., the number of TRPs to be configured, as well as / or the location of the TRPs relative to the UE and the relative positions of the TRPs to each other).

[0089] The TCI index may be configured to show TCI state information for two or more TRPs by a table that maps the TCI index to two or more TCI states. Tables 2 and 3 are shown below. Table 2 shows the TCI state index for one additional TRP, and Table 3 shows the TCI states for two additional TRPs.

[0090] [Table 2]

[0091] [Table 3]

[0092] The DCI TCI status transmission parameters, the RNTI value after successfully descrambling the CRC, or both the TCI status transmission parameters and the RNTI value may point to a multi-TRP TCI status table, such as Table 3, for two TRPs, depending on the configuration signaled by the RRC. Whether the DCI parameters and / or RNTI should be interpreted by the UE as pointing to a single-TRP table (Table 2) or a multi-TRP table (Table 3) may be set in the RRC.

[0093] Furthermore, as described above, the multi-TRP table (Table 3) can point to the TCI states in Table 2 in the "TCI State" column. In this case, since Table 3 refers to (or depends on) Table 2, both types of tables can be constructed or signaled by the RRC. Alternatively, the multi-TRP states may be constructed statically as defined in the standard. In the latter case, the multi-TRP table may be constructed with an RRC that does not refer to single TRP states from a single TRP TCI table, but rather may refer to statically constructed multi-TRP states (e.g., an index of multi-TRP states in a static configuration).

[0094] Combination table-based embodiment

[0095] Table 3 above maps index values ​​to combinations of TCI states applied to TRP combinations. Therefore, Table 3 can be considered a combination table. Several further examples and embodiments of using combination tables to show values ​​for multi-TRP communication are disclosed below. This disclosure demonstrates the possibility of RRC creating or making available an intermediate combination table for multi-TRP signaling. A common structure of a combination table may include numerous indexes, where each index in a given table corresponds to a row, showing different TRP ID combinations and corresponding combinations of indices in the DCI bitmap fields of a given parameter (such as a DMRS port indication or TCI state). When a combination table is configured and made available by RRC, the corresponding bitmaps of DCI can be used to show the indexes in the new combination table instead of the original indications of the corresponding parameters / indexes for the single-TRP case (e.g., the indices in the "Value" column of Table 1 or the "Index" column of Table 2).

[0096] Table 4 illustrates a possible general structure for a single TRP instruction table, and Table 5 shows a general structure for a multi-TRP combination table.

[0097] [Table 4]

[0098] [Table 5]

[0099] Examples of single TRP parameter instruction tables include the DMRS port instruction table and the TCI status instruction table (see Table 2). Note that while the single TRP parameter instruction table (Table 4) has one column, "Single TRP Information," this information may be divided into more columns, for example, in the DMRS port instruction table, which may include columns for data and information about each DMRS group that does not have a DMRS port.

[0100] A single TRP parameter reference table, such as Table 4, can have Z rows (indices) according to the size of the corresponding field in the DCI. The Y-bit DCI field is used to indicate parameter X, as shown in Table 4 (where 2^Y >= Z).

[0101] In this disclosure, the term “single TRP” is used to distinguish it from tables or parameters specifically designed or configured for multi-TRP applications described herein. For example, as described above, the “single TRP” DMRS port instruction table from the standard is also applicable to some extent to multi-TRP communications. In some embodiments, a combination table is combined with the single TRP table to indicate parameter value instructions. The single TRP table is also called the “existing” table because it is also usable in non-multi-TRP scenarios and must “exist” so that the combination table can be referenced. Furthermore, in Table 5, “X” indicates a given transmission parameter (e.g., a DMRS port instruction of TCI status as indicated by the single TRP instruction table).

[0102] As can be seen, Table 3 satisfies the structure of a general combination table (Table 5) and can therefore be considered an example of a multi-TRP combination table. Accordingly, the techniques shown in the section on "Combination Table-Based Embodiments" can also be applied to combination tables (Table 3) shown in the preceding sections of this disclosure, such as setting up, signaling, activating, and indexing RRC combination tables.

[0103] For example, a combination table, as can be seen from Table 5, may include three columns and Z indexes (where Z is the same as the number of indexes in the corresponding single TRP parameter indicator table). The first column is the index signaled by DCI. The second column is a combination of TRPs, e.g., a TRP set containing one or more TRPs, for which information about the corresponding parameter X needs to be signaled. The third column is a combination of indexes (a series of "candidate values") pointing to existing (single TRP) tables, indicating the information about the parameter X of the corresponding TRP for that index.

[0104] In each row (set of mappings), the number of TRPs in the "TRP combination" column (second column) is the same as the number of indices in the "index combination" column (third column). For example, the index in the third column corresponds to the TRP in the second column in the order of the list (the first value corresponds to the first TRP listed in the same row, the second value corresponds to the second TRP, and so on).

[0105] Furthermore, combination tables can be called "intermediate" combination tables because they are inserted in intermediate positions in the chain / hierarchy of references, for example, as follows: DCI parameters → Intermediate combination table →Single TRP instruction table (with multiple values) →Static configuration.

[0106] In some embodiments, the configuration includes a series of mappings between a TRP set and a set of candidate values ​​consisting of one or more candidate values ​​for a transmission parameter, wherein at least one of one or more indicators indicates, from the series of mappings, a mapping between one of the TRP sets used as multiple TRPs and one of the set of candidate values ​​used as multiple values ​​for one or more transmission parameters used for multiple transmissions or receptions.

[0107] Figure 8 shows an exemplary parameter acquisition circuit 535 for an embodiment in which the configuration includes a series of mappings between a TRP set and a set of candidate values. For example, the parameter acquisition circuit includes a combination table selection circuit (or combination table activation circuit) 836 and a multiple value acquisition circuit 837.

[0108] For example, a set of mappings between a TRP set and a set of candidate values ​​is defined by an intermediate combination table. Each row in the combination table can define one mapping in the set of mappings. A TRP set corresponds to each entry in the "TRP combination" column of the combination table. Based on the DCI instructions (the values ​​of the transmission parameters), one of the TRP sets is determined / retrieved to become multiple TRPs used for transmission or reception, associated with one or more indexes in the "Combination of indexes in existing tables of X" column in Table 5.

[0109] Furthermore, it can be seen that a typical combination table (Table 5) includes entries for a single TRP (in rows with indexes "0" and "1"). Thus, in addition to showing multiple transmits and receives with multiple TRPs, DCI signaling in combination with a combination table can show a single value for a given transmit parameter for a transmit or receive using a single TRP. A combination table containing one or more rows referencing a single TRP can facilitate flexible switching between different TRPs, and flexible switching between single-TRP transmits and receives and multi-TRP transmits and receives.

[0110] As described above, the bit field of parameter X points to a row in the combination table, and the number of rows / indexes in the combination table may be less than or equal to the number of rows in the parameter indicator table (Table 4). Therefore, embodiments using a series of mappings (combination tables) can be implemented without incurring additional DCI overhead. However, the number of rows in the combination table may generally be greater than the number of rows in the parameter indicator table. Generally, a flexible and scalable technique is provided that can facilitate communication between the UE and multiple TRPs. Furthermore, the series of mappings may be applicable to different DCI fields designed for use in single-TRP applications or without considering the case of multiple TRPs, and to one or more DCI fields simultaneously.

[0111] The combination table for parameter X may be configured as a new table, or different alternative (e.g., static and dynamic) configurations may be applied.

[0112] In some embodiments, the set of mappings is M mappings out of N statically configured mappings, where M is less than or equal to N, and the UE transceiver 520 receives M indices during operation, each indicating one of the M mappings signaled by the network node transceiver 570 via the RRC, and at least one indicator indicates an index showing a mapping between multiple TRPs and multiple values ​​of one or more transmit parameters used for multiple transmits or receives.

[0113] Therefore, the combination table can be statically configured to include N rows corresponding to the mapping between the TRP set and the parameter candidate set, and correspondingly N indexes covering various combinations (e.g., all possible combinations of TRP, or a set of desired / required combinations of TRP). The N statically configured indexes constitute a superset of indexes.

[0114] Subsequently, network node 560 signals a (sub)set of M indices (M <= N) from a superset of N indices. The set of M indices corresponds to a set of M mappings between the TRP set and the candidate value set, from which the parameter used for transmission or reception is selected and indicated by the DCI field. The network node dynamically indicates one index in the (sub)set of mappings for the UE using the DCI bit field of parameter X, and the UE is notified of that index by the RRC.

[0115] However, combinatorial tables (not just a subset of indexes for statically constructed combinatorial tables) may be signaled by RRC signaling. Whether a combinatorial table is statically constructed or RRC-constructed, it can have the structure of Table 5.

[0116] In some embodiments, the contents of a mapping table that defines a set of mappings between TRP sets and candidate values ​​(for the index) are signaled by RRC.

[0117] For example, RRC dynamically constructs a new combinational table that defines a set of mappings, and the entire table (e.g., a list of entries for each column) is signaled to the UE by RRC signaling. The length of the configuration table for the RRC configuration may vary, for example, depending on the number of TRPs and the scenario. The network node dynamically indicates to the UE one index from the configuration table for the RRC configuration using the DCI bitfield of parameter X.

[0118] For example, RRC signaling indicating a list of new combination table indexes for parameter X can be signaled in the RRC information element "PDSCH-Config," as shown in Figure 9. In Figure 9, the definition for parameter X is shown in bold. Furthermore, as shown in the examples in Figures 10 and 11, parameter X may be, for example, a DMR port instruction and / or TCI status. Through this information element, the contents of each index in the combination table are communicated to the UE, as are other parameters also included in this information element. Through RRC signaling, the UE obtains information including the number of indexes in the combination table and the contents of each index in the combination table (the corresponding set of TRPs and the set of value candidates (the values ​​of the single TRP instruction table index for each row)).

[0119] If the combination table is not configured by static configuration or RRC, the process can continue with the DCI fields directly pointing to a (single TRP) instruction table, such as the DMRS port instruction table or the configured TCI status table.

[0120] The format of a combination table can be statically defined, including the number of columns and the information each column receives (the type of information each column contains, e.g., "TRP set" and "combination of indexes in existing tables"). The format of a combination table (or a combined table) may be static and the same regardless of the number of TRPs.

[0121] As described above, the RRC PDSCH component (PDSCH-Config) indicates the number of indexes and the contents of each index. The number of indexes and the contents of the table (the mapping between the TRP set and the set of value candidates) differ depending on the number of TRPs included and the number of TRPs for which the combination table is used (the number of TRPs that each TRP set is selected / formed by). However, the format of the table, including the number of columns and their interpretation, may be the same regardless of the number of TRPs that need to indicate parameter X. Therefore, since the number of TRPs is implicitly included in the contents of the combination table, no additional signaling is required to indicate how many TRPs are involved. Table 7 is an example of a combination table for 2-TRP, and Table 8 is an example of a combination table for 4-TRP.

[0122] [Table 7]

[0123] [Table 8]

[0124] For some communication systems or scenarios, if a combination table is configured (by RRC and / or static combinations), it may be determined or defined that this combination table is used to indicate the values ​​of parameter X or more parameters. However, if a combination table is configured, various activation mechanisms may be implemented to enable or disable the multi-TRP combination table (e.g., "toggle" multi-TRP communication on or off).

[0125] For example, parameters can be included in the PDCCH information element (IE) to indicate to the UE whether a new combination table should be used and whether the DCI bit field of a given parameter should point to this new combination table. For example, as shown in Figure 12, the existence of a combination table and the activation of its use can be signaled in the ControlResourceSet information element of RRC signaling. During operation, the UE transceiver 520 receives an activation parameter that indicates that multiple transmits or receives will be performed based on a series of mappings and is signaled by the RRC, and the UE circuit 530, during operation, determines based on that activation parameter that multiple transmits or receives will be performed based on a series of mappings.

[0126] Here, "parameter_X" may be a DMRS port indicator, a TCI state indicator, or another parameter. As shown in Figure 13, an enable parameter such as DMRSPortMultiTRP-CombinedTableIndicationInDCI is used to inform the UE that a combined table for multi-TRPs, used to point to an existing DMRS port indicator table, has been made available. As shown in Figure 14, a parameter such as TCIStateMultiTRP-CombinedTableIndicationInDCI can be used to inform the UE that a combined table for multi-TRPs, used to point to a TCI state (which can be defined in a single-TRP TCI state indicator table), has been made available.

[0127] Please note that each activation parameter does not carry the actual contents / information of each combination table, but merely indicates how to enable the use of the combination tables. The actual contents of the combination tables can be included in the PDSCH-Config information element, as described above.

[0128] However, further techniques exist regarding how the existence of a combination table or the activation of its use can be communicated to the UE. For example, as in the embodiments described in the previous section, a new UE-specific RNTI can be configured, or an existing RNTI can be enhanced with additional functionality to indicate the activation of a combination table. When the DCI CRC is scrambled with such an RNTI, the UE assumes that a combination table is being used and that the bitfield of the DCI for parameter X points to an index in that combination table.

[0129] Therefore, during operation, the UE circuit 530 descrambles the CRC attached to the DCI using an RNTI that is included in or can be derived from the configuration (an RNTI indicates that multiple transmits or receives are performed based on a set of mappings (e.g., a combination table)), and based on the results of successfully descrambling the CRC attached to the DCI using the RNTI, it determines that multiple transmits or receives are performed based on a set of mappings.

[0130] Furthermore, the RNTI functionality described in this section can be combined with the RNTI functionality described in the sections preceding the disclosure of RNTI-based approaches. For example, a series of RNTI candidates is not a single TCI state indicator table, but rather a succession of integers under which the UE performs a series of descramble trials.

[0131] An example of DMRS port instruction signaling using a combination table is shown below. Table 9 is a DMRS port instruction table of configuration type 1 with a 1-symbol length. This table has 16 indexes. When a combination table for DMRS port instruction is configured and enabled, such as in Table 10, rather than directly signaling the index of the DMRS port instruction table, 4 bits (i.e., the 4-bit DCI field for DMRS port instruction) are used to indicate the index of the combination table on the right, pointing to the DMRS port instruction table for the two TRPs. The exact combination, the number of indexes, etc., can be configured by the RRC depending on the scenario. Furthermore, it should be noted that Table 10 merely shows an illustrative structure of the combination table, and the values ​​are not necessarily applicable to Table 9. Rather, the entries should be understood as placeholders.

[0132] [Table 9]

[0133] [Table 10]

[0134] Furthermore, as described above, the combination table may be used for multi-TRP TCI state signaling. Table 11 shows an indicator table that can be used for up to eight TCI states. The existing 3-bit TCI bit field can indicate one of the eight setting states in Table 11 for a single TRP if the TCI state combination table is not enabled. However, instead of directly signaling the TCI state index, if a TCI state combination table like Table 12 is enabled, the 3 bits of DCI are used to indicate an index in the combination table (Table 12) that points to the TCI states of two TRPs (e.g., two separate states from Table 11). The exact combinations (and which of the entire set of statically configured TCI states to enable), the number of indices, etc., can be configured by the RRC depending on the scenario.

[0135] [Table 11]

[0136] [Table 12]

[0137] This disclosure can be implemented in software, hardware, or software in conjunction with hardware. Each functional block used in the description of each embodiment above can be implemented partially or entirely by an LSI such as an integrated circuit, and each process described in each embodiment may be controlled partially or entirely by the same LSI or combination of LSIs. The LSI may be formed individually as chips, or a single chip may be formed to include some or all of the functional blocks. The LSI may include data inputs and data outputs connected thereto. Here, LSIs may be referred to as ICs, system LSIs, super LSIs, or ultra LSIs depending on the degree of integration. However, the technology for realizing integrated circuits is not limited to LSIs and may be implemented using dedicated circuits, general-purpose processors, or dedicated processors. Alternatively, an FPGA (Field Programmable Gate Array) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells arranged inside the LSI may be used. This disclosure can be implemented as digital or analog processing. If future integrated circuit technologies replace LSIs as a result of advances in semiconductor technology or other derivative technologies, functional blocks can be integrated using those future integrated circuit technologies. Biotechnology is also applicable.

[0138] This disclosure can be implemented by any kind of device, apparatus, or system having communication capabilities, which is referred to as a communication apparatus.

[0139] Some non-exclusive examples of such communication devices include telephones (e.g., mobile phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, vehicles providing communication capabilities (e.g., automobiles, airplanes, ships), and various combinations thereof.

[0140] Communication devices are not limited to portable or mobile devices, but may also include all kinds of non-portable or fixed devices, devices, or systems, such as smart home devices (e.g., appliances, lighting, smart meters, control panels), vending machines, and any other "things" in the "Internet of Things (IoT)" network.

[0141] Communication can include, for example, the exchange of data via cellular systems, wireless LAN systems, and communication satellite systems, as well as data exchange through various combinations thereof.

[0142] A communication device may have devices such as controllers and sensors that are connected to a communication device that performs the communication functions described in this disclosure. For example, a communication device may have a controller or sensor that generates control signals or data signals used by the communication device that performs the communication functions of the communication device.

[0143] Furthermore, communication equipment may also include infrastructure facilities, such as base stations, access points, and any other devices, equipment, or systems, that communicate with or control the equipment in the non-limiting examples described above.

[0144] This disclosure provides a transceiver that, during operation, receives downlink control information (DCI) for scheduling multiple transmits or receives between a user device (UE) and multiple transmit / receive points (TRPs) on multiple channels in a physical downlink control channel (PDCCH), wherein the DCI includes one or more indicators each indicating one or more transmit parameters; and a circuit that, during operation, obtains multiple values ​​for each of the one or more transmit parameters based on the one or more indicators and configuration, wherein the transceiver, during operation, performs the multiple transmits or receives using one of the multiple values ​​of the one or more transmit parameters for each of the multiple transmits or receives.

[0145] In some embodiments, the one or more transmit parameters include at least one of a demodulation reference signal (DMRS) port indication and a transmit configuration indication (TCI) state.

[0146] In some embodiments, the configuration includes a Radio Network Temporary Identifier (RNTI), or the RNTI is derivable from the configuration, the UE circuit uses the RNTI during operation to descramble the CRC appended to the DCI, and the RNTI, alone or in combination with the at least one indicator in the DCI signaling, indicates at least one of the plurality of values ​​of the transmit parameter.

[0147] In some embodiments, the configuration includes a first DMRS port instruction table and a second DMRS port instruction table, the circuit descrambles a cyclic redundancy check (CRC) appended to the DCI using a Radio Network Temporary Identifier (RNTI) included in or derivable from the configuration during operation, the RNTI indicates that the second DMRS port instruction table is used for at least one of the plurality of transmits or receives, the transceiver performs the at least one of the plurality of transmits or receives using the second DMRS port instruction table in accordance with the result of successfully descrambling the CRC using the RNTI during operation, and one or more indicators indicate a DMRS port instruction from the second DMRS port instruction table.

[0148] For example, the indicator indicates a first value from among the plurality of values ​​of the TCI state, the RNTI is one of K RNTI candidates, the first of the K RNTI candidates is included in the configuration, the RNTI candidate is a sequence of K integers each representing one of the K set TCI states signaled by radio resource control (RRC), and the circuit, during operation, determines the first value of the TCI state based on the indicator, and uses the RNTI candidate representing the TCI state to be used as the second value from among the K TCI states as the RNTI, and obtains the second value from among the plurality of values ​​of the TCI state based on the result of successfully descrambling the CRC attached to the DCI.

[0149] For example, the indicator indicates a first value from among the plurality of values ​​of the TCI state, and the circuit, in operation, descrambles a cyclic redundancy check (CRC) attached to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, the RNTI being one of K RNTI candidates, the first of the K RNTI candidates being included in the configuration, the RNTI candidate being a sequence of K integers each representing one of K set TCI states signaled by the RRC, and the circuit, in operation, determines the first value of the TCI state based on the indicator, and obtains the second value from among the plurality of values ​​of the TCI state based on the result of successfully descrambling the CRC attached to the DCI using the RNTI candidate representing the TCI state to be used as the second value from among the K TCI states as the RNTI.

[0150] According to some embodiments, at least one of the indicator and the RNTI indicates a multi-TRP TCI state, the multi-TRP TCI state having two or more TCI states for transmission or reception to two or more TRPs.

[0151] In some embodiments, the configuration includes a series of mappings between a TRP set and a set of candidate values ​​consisting of one or more candidate values ​​for the transmission parameters, wherein at least one of the one or more indicators indicates, from the series of mappings, a mapping between one of the TRP sets used as the plurality of TRPs and one of the set of candidate values ​​used as the plurality of values ​​for the one or more transmission parameters used for the plurality of transmission or reception.

[0152] In some embodiments, the set of mappings is M mappings out of N statically configured mappings, where M is less than or equal to N, and the transceiver receives M indices during operation that each indicate one of the M mappings signaled by the RRC, and the at least one indicator indicates an index that shows a mapping between the plurality of TRPs and the plurality of values ​​of the one or more transmit parameters used for the plurality of transmit or receive.

[0153] In some embodiments, the transceiver receives the contents of a mapping table that defines the series of mappings during operation, and the contents of the mapping table are signaled by RRC.

[0154] For example, the transceiver receives an activation parameter during operation that indicates the plurality of transmissions or receptions are performed based on the set of mappings and is signaled by the RRC, and the circuit determines during operation, based on the activation parameter, that the plurality of transmissions or receptions are performed based on the set of mappings.

[0155] For example, the circuit, during operation, uses a Radio Network Temporary Identifier (RNTI) included in or derivable from the configuration to descramble a Cyclic Redundancy Check (CRC) attached to the DCI (where the RNTI indicates that the multiple transmits or receives are performed based on the set of mappings), and determines, based on the results of successfully descrambling the CRC attached to the DCI using the RNTI, that the multiple transmits or receives are performed based on the set of mappings.

[0156] In some embodiments, the transceiver receives a signal including the RRC during operation.

[0157] The disclosure further provides a network node comprising: a circuit that, during operation, determines multiple values ​​for each of one or more transmission parameters for multiple transmissions or receptions between multiple transmit / receive points (TRPs) and user equipment (UE) on multiple channels, and generates downlink control information (DCI) for scheduling the multiple transmissions or receptions, wherein the DCI includes one or more indicators that each indicate one or more of the one or more transmission parameters, and the one or more indicators, in combination with a configuration, indicate the multiple values ​​for each of the one or more transmission parameters; and a transceiver that, during operation, transmits the DCI on a physical downlink control channel (PDCCH).

[0158] For example, during operation, the transceiver performs at least one of the multiple transmissions or receptions using one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0159] In some embodiments, the one or more transmit parameters include at least one of a demodulation reference signal (DMRS) port indication and a transmit configuration indication (TCI) state.

[0160] In some embodiments, the configuration includes a Radio Network Temporary Identifier (RNTI), or the RNTI is derivable from the configuration, the network node circuit uses the RNTI during operation to scramble the CRC appended to the DCI, and the RNTI, alone or in combination with the at least one indicator in the DCI signaling, indicates at least one of the plurality of values ​​of the transmit parameter.

[0161] In some embodiments, the configuration includes a first DMRS port instruction table and a second DMRS port instruction table, the circuit scrambling cyclic redundancy checks (CRCs) appended to the DCI using a Radio Network Temporary Identifier (RNTI) included in or derivable from the configuration during operation, the RNTI indicating that the second DMRS port instruction table is used for at least one of the plurality of transmits or receives.

[0162] In some embodiments, the indicator indicates a first value from among the plurality of values ​​of the TCI state, the RNTI is one of K RNTI candidates, the first of the K RNTI candidates is included in the configuration, and the RNTI candidate is a sequence of K successive integers each representing one of the K set TCI states signaled by Radio Resource Control (RRC).

[0163] According to some embodiments, at least one of the indicator and the RNTI indicates a multi-TRP TCI state, the multi-TRP TCI state having two or more TCI states for transmission or reception to two or more TRPs.

[0164] In some embodiments, the configuration includes a series of mappings between a TRP set and a set of candidate values ​​consisting of one or more candidate values ​​for the transmission parameters, wherein at least one of the one or more indicators indicates, from the series of mappings, a mapping between one of the TRP sets used as the plurality of TRPs and one of the set of candidate values ​​used as the plurality of values ​​for the one or more transmission parameters used for the plurality of transmission or reception.

[0165] In some embodiments, the set of mappings is M mappings out of N statically configured mappings, where M is less than or equal to N, and the transceiver transmits M indices during operation that each of the M mappings is signaled by the RRC, and the at least one indicator shows an index that shows a mapping between the plurality of TRPs and the plurality of values ​​of the one or more transmit parameters used for the plurality of transmit or receive.

[0166] In some embodiments, the transceiver transmits the contents of a mapping table that defines the series of mappings during operation, and the contents of the mapping table are signaled by RRC.

[0167] For example, during operation, the transceiver transmits an enable parameter that indicates the multiple transmissions or receptions are performed based on the series of mappings and is signaled by the RRC.

[0168] For example, the circuit, during operation, uses a Radio Network Temporary Identifier (RNTI) included in or derivable from the configuration to scramble a Cyclic Redundancy Check (CRC) appended to the DCI, the RNTI indicating that the multiple transmits or receives are performed based on the set of mappings.

[0169] In some embodiments, the transceiver transmits a signal including the RRC during operation.

[0170] The Disclosure further provides a communication method for user equipment, which includes receiving downlink control information (DCI) for scheduling multiple transmissions or receptions between the UE and multiple transmit / receive points (TRPs) on a physical downlink control channel (PDCCH) on multiple channels (where the DCI includes one or more indicators indicating one or more transmit parameters, respectively), obtaining multiple values ​​for each of the one or more transmit parameters based on the one or more indicators and configuration, and performing the multiple transmissions or receptions using one of the multiple values ​​of the one or more transmit parameters for each of the multiple transmissions or receptions.

[0171] In some embodiments, the one or more transmit parameters include at least one of a demodulation reference signal (DMRS) port indication and a transmit configuration indication (TCI) state.

[0172] In some embodiments, the configuration includes a Radio Network Temporary Identifier (RNTI), or the RNTI is derivable from the configuration, and the method includes using the RNTI to descramble a CRC appended to the DCI, wherein the RNTI, alone or in combination with the at least one indicator in the DCI signaling, indicates at least one of the plurality of values ​​of the transmit parameter.

[0173] In some embodiments, the configuration includes a first DMRS port instruction table and a second DMRS port instruction table, the method comprising descrambling a cyclic redundancy check (CRC) appended to the DCI using a Radio Network Temporary Identifier (RNTI) included in or derivable from the configuration (where the RNTI indicates that the second DMRS port instruction table is used for at least one of the plurality of transmits or receives), and performing the at least one of the plurality of transmits or receives using the second DMRS port instruction table according to the result of successfully descrambling the CRC using the RNTI (where the one or more indicators indicate a DMRS port instruction from the second DMRS port instruction table).

[0174] For example, the indicator indicates a first value from among the plurality of values ​​of the TCI state, the RNTI is one of K RNTI candidates, the first of the K RNTI candidates is included in the configuration, the RNTI candidate is a sequence of K successive integers each representing one of the K set TCI states signaled by radio resource control (RRC), and the method includes descrambling the first value of the TCI state based on the indicator, and obtaining the second value from among the plurality of values ​​of the TCI state based on the result of successfully descrambling the CRC attached to the DCI, using the RNTI candidate representing the TCI state to be used as the second value from among the K TCI states as the RNTI.

[0175] For example, the indicator indicates a first value from among the plurality of values ​​of the TCI state, the circuit descrambles a cyclic redundancy check (CRC) attached to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, the RNTI being one of K RNTI candidates, the first of the K RNTI candidates being included in the configuration, the RNTI candidate being a sequence of K successive integers each representing one of K configured TCI states signaled by the RRC, the method comprising determining the first value of the TCI state based on the indicator, and obtaining the second value from among the plurality of values ​​of the TCI state based on the result of successfully descrambling the CRC attached to the DCI using the RNTI candidate representing the TCI state to be used as the second value from among the K TCI states as the RNTI.

[0176] According to some embodiments, at least one of the indicator and the RNTI indicates a multi-TRP TCI state, the multi-TRP TCI state having two or more TCI states for transmission or reception to two or more TRPs.

[0177] In some embodiments, the configuration includes a series of mappings between a TRP set and a set of candidate values ​​consisting of one or more candidate values ​​for the transmission parameters, wherein at least one of the one or more indicators indicates, from the series of mappings, a mapping between one of the TRP sets used as the plurality of TRPs and one of the set of candidate values ​​used as the plurality of values ​​for the one or more transmission parameters used for the plurality of transmission or reception.

[0178] In some embodiments, the set of mappings is M mappings out of N statically configured mappings, where M is less than or equal to N, and the method comprises receiving M indices that each indicate one of the M mappings signaled by the RRC, wherein the at least one indicator indicates an index that shows a mapping between the plurality of TRPs and the plurality of values ​​of the one or more transmission parameters used for the plurality of transmissions or receptions.

[0179] In some embodiments, the method includes receiving the contents of a mapping table that defines the set of mappings, the contents of the mapping table being signaled by RRC.

[0180] For example, the method includes receiving an enablement parameter that indicates the plurality of transmissions or receptions are performed based on the set of mappings and is signaled by the RRC, and determining, based on the enablement parameter, that the plurality of transmissions or receptions are performed based on the set of mappings.

[0181] For example, the method includes descrambling a cyclic redundancy check (CRC) attached to the DCI using a wireless network temporary identifier (RNTI) included in or derivable from the configuration (where the RNTI indicates that the multiple transmits or receives are performed based on the set of mappings), and determining, based on the results of successfully descrambling the CRC attached to the DCI using the RNTI, that the multiple transmits or receives are performed based on the set of mappings.

[0182] In some embodiments, the method includes receiving a signal including the RRC.

[0183] Furthermore, the present disclosure provides a communication method for a network node, which determines multiple values ​​for each of one or more transmission parameters for multiple transmissions or receptions between multiple transmit / receive points (TRPs) and user equipment (UE) on multiple channels, generates downlink control information (DCI) for scheduling the multiple transmissions or receptions (wherein the DCI includes one or more indicators indicating each of the one or more transmission parameters, and the one or more indicators, in combination with a configuration, indicate the multiple values ​​for each of the one or more transmission parameters), and transmits the DCI on a physical downlink control channel (PDCCH).

[0184] For example, the method includes performing at least one of the multiple transmissions or receptions using one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0185] In some embodiments, the one or more transmit parameters include at least one of a demodulation reference signal (DMRS) port indication and a transmit configuration indication (TCI) state.

[0186] In some embodiments, the configuration includes a Radio Network Temporary Identifier (RNTI), or the RNTI is derivable from the configuration, and the method includes using the RNTI to scramble a CRC appended to the DCI, wherein the RNTI, alone or in combination with the at least one indicator in the DCI signaling, indicates at least one of the plurality of values ​​of the transmit parameter.

[0187] In some embodiments, the configuration includes a first DMRS port instruction table and a second DMRS port instruction table, the method comprising scrambling cyclic redundancy checks (CRCs) appended to the DCI using a Radio Network Temporary Identifier (RNTI) included in or derivable from the configuration, the RNTI indicating that the second DMRS port instruction table is used for at least one of the plurality of transmits or receives.

[0188] In some embodiments, the indicator indicates a first value from among the plurality of values ​​of the TCI state, the RNTI is one of K RNTI candidates, the first of the K RNTI candidates is included in the configuration, and the RNTI candidate is a sequence of K successive integers each representing one of the K set TCI states signaled by Radio Resource Control (RRC).

[0189] According to some embodiments, at least one of the indicator and the RNTI indicates a multi-TRP TCI state, the multi-TRP TCI state having two or more TCI states for transmission or reception to two or more TRPs.

[0190] In some embodiments, the configuration includes a series of mappings between a TRP set and a set of candidate values ​​consisting of one or more candidate values ​​for the transmission parameters, wherein at least one of the one or more indicators indicates, from the series of mappings, a mapping between one of the TRP sets used as the plurality of TRPs and one of the set of candidate values ​​used as the plurality of values ​​for the one or more transmission parameters used for the plurality of transmission or reception.

[0191] In some embodiments, the set of mappings is M mappings out of N statically configured mappings, where M is less than or equal to N, and the method comprises transmitting M indices that each indicate one of the M mappings signaled by the RRC, wherein the at least one indicator indicates an index that shows a mapping between the plurality of TRPs and the plurality of values ​​of the one or more transmission parameters used for the plurality of transmissions or receptions.

[0192] In some embodiments, the method includes transmitting the contents of a mapping table that defines the set of mappings, the contents of the mapping table being signaled by RRC.

[0193] For example, the method includes transmitting an enable parameter that indicates the plurality of transmissions or receptions are performed based on the set of mappings and is signaled by the RRC.

[0194] For example, the method includes scrambling cyclic redundancy checks (CRCs) appended to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, wherein the RNTI indicates that the multiple transmits or receives are performed based on the set of mappings.

[0195] In some embodiments, the method includes transmitting a signal including the RRC.

[0196] In summary, this disclosure relates to user equipment (UE), network nodes, and communication methods for the UE and network nodes, respectively. The UE includes a transceiver that, in operation, receives downlink control information (DCI) for scheduling multiple transmits or receives between the UE and multiple transmit / receive points (TRPs) on multiple channels on a physical downlink control channel (PDCCH), wherein the DCI includes one or more indicators each indicating one or more transmit parameters, and a circuit that, in operation, obtains multiple values ​​for each of the one or more transmit parameters based on the one or more indicators and configuration. In operation, the transceiver performs each of the multiple transmits or receives using one of the multiple values ​​of the one or more transmit parameters for each of the multiple transmits or receives.

Claims

1. A transceiver transmits downlink control information in a physical downlink control channel, and the downlink control information includes one or more indicators and a transmission configuration instruction field relating to one or more transmission parameters. A control circuit that determines one or more transmission parameters based on the configuration indicated by one or more indicators and the transmission configuration instruction field, The transceiver performs transmission or reception using one or more transmission parameters. If the configuration indicated by the transmission configuration instruction field corresponds to a single TRP, the one or more transmission parameters are determined using the first table. If the configuration indicated by the transmission configuration instruction field corresponds to multiple TRPs, one or more transmission parameters are determined using a second table. The columns constituting the second table are the same as the columns constituting the first table in terms of at least some of the entries. The number of bits representing the index of the second table is the same as the number of bits representing the index of the first table. Base station.

2. The one or more transmission parameters include the antenna port number of the demodulation reference signal. The base station according to claim 1.

3. Each of the entries modified or added for the second table above indicates multiple antenna port numbers for the demodulation reference signal. The base station according to claim 1.

4. Some values ​​in the aforementioned transmission configuration instruction field indicate a single case, while other values ​​indicate multiple cases. The base station according to claim 1.

5. Downlink control information is transmitted in a physical downlink control channel, and the downlink control information includes one or more indicators and transmission configuration instruction fields relating to one or more transmission parameters. Based on the configuration indicated by the one or more indicators and the transmission configuration instruction field, the one or more transmission parameters are determined. The system performs transmission or reception using one or more of the aforementioned transmission parameters. If the configuration indicated by the transmission configuration instruction field corresponds to a single TRP, the one or more transmission parameters are determined using the first table. If the configuration indicated by the transmission configuration instruction field corresponds to multiple TRPs, one or more transmission parameters are determined using a second table. The columns constituting the second table are the same as the columns constituting the first table in terms of at least some of the entries. The number of bits representing the index of the second table is the same as the number of bits representing the index of the first table. Communication method.

6. The one or more transmission parameters include the antenna port number of the demodulation reference signal. The communication method according to claim 5.

7. Each of the entries modified or added for the second table above indicates multiple antenna port numbers for the demodulation reference signal. The communication method according to claim 5.

8. Some values ​​in the aforementioned transmission configuration instruction field indicate a single case, while other values ​​indicate multiple cases. The communication method according to claim 5.

9. A physical downlink control channel transmits downlink control information, and the downlink control information includes one or more indicators and a transmission configuration instruction field related to one or more transmission parameters, and the process is as follows: A process for determining one or more transmission parameters based on the configuration indicated by the one or more indicators and the transmission configuration instruction field, A process that performs transmission or reception using one or more transmission parameters, Control, If the configuration indicated by the transmission configuration instruction field corresponds to a single TRP, the one or more transmission parameters are determined using the first table. If the configuration indicated by the transmission configuration instruction field corresponds to multiple TRPs, one or more transmission parameters are determined using a second table. The columns constituting the second table are the same as the columns constituting the first table in terms of at least some of the entries. The number of bits representing the index of the second table is the same as the number of bits representing the index of the first table. Integrated circuit.

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