User equipment and network node involved in transmission of signal

Abstract

To facilitate physical downlink control channel (PDCCH) signaling for multi-TRP (transmission and reception point) communication.SOLUTION: A network node includes: a transceiver that transmits downlink control information (DCI) in PDCCH including one or more indicators related to one or more transmission parameters and a transmission configuration indication field; and a control circuit which determines one or more transmission parameters on the basis of a configuration indicated by the one or more indicators and the transmission configuration indicator field. The transceiver performs transmission and reception using the one or more transmission parameters, the one or more transmission parameters being determined by using a first table when the configuration indicated by the transmission configuration indication filed corresponds to single TRP, and determined by using a second table when the configuration corresponds to multi TRP. The rows constituting the second table and the number of bits indicating indices of the second table are same as those of the first table.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to transmitting and receiving signals in a communication system. In particular, the present disclosure relates to methods and apparatus for such transmission and reception. [Background technology]

[0002] The 3rd Generation Partnership Project (3GPP®) is working on technical specifications for the next generation of cellular technology, also known as the fifth generation (5G), which includes the "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 may facilitate efficient operation of the communication system as well as certain devices associated with the communication system. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] RP-182067, 'Revised WID (work item description): Enhancements on MIMO for NR', Samsung, 3GPP TSG RAN (Technical Specification Group Radio Access Network) Meeting #81, Gold Coast, Australia, Sept 10 - 13, 2018 [Non-Patent Document 2] 3GPP TR 36.932 V15.0.0 (2018-06) [Non-Patent Document 3] S. Sesia, I. Toufik and M. Baker, LTE: The UMTS Long Term Evolution, Second Edition [Non-Patent Document 4] 3GPP TS 38.211 V15.0.0 (2017-12) [Non-Patent Document 5] 3GPP TS 38.212 V15.2.0 Summary of the Invention

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

[0006] A main aspect of the present disclosure is a transceiver for transmitting downlink control information on a physical downlink control channel, the downlink control information including one or more indicators relating to one or more transmission parameters and a transmission configuration indication field; and a control circuit that determines the one or more transmission parameters based on the one or more indicators and a configuration indicated by the transmission configuration indication field; the transceiver performs transmission or reception using the one or more transmission parameters; If the configuration indicated by the transmission configuration indication field corresponds to single, the one or more transmission parameters are determined using a first table; If the configuration indicated by the transmission configuration indication field corresponds to a plurality of 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 an index of the second table is the same as the number of bits representing an index of the first table. It is a terminal.

[0007] In one general aspect, the techniques disclosed herein feature a user equipment (UE) having a transceiver that, during operation, receives, on a physical downlink control channel (PDCCH), downlink control information (DCI) for scheduling multiple transmissions or receptions between the UE and multiple transmission / reception points (TRPs) on multiple channels, the DCI including one or more indicators indicative of one or more transmission parameters, respectively; and circuitry that, during operation, obtains multiple values ​​for each of the one or more transmission parameters based on the one or more indicators and a configuration, wherein the transceiver, during operation, performs the multiple transmissions or receptions using a respective one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0008] It should be noted that the general or specific embodiments may be realized as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

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

[0010] Exemplary embodiments will now be described in more detail with reference to the accompanying drawings.

[0011] [Figure 1] FIG. 1 illustrates an example architecture for a 3GPP NR system, including example user and control plane architectures for LTE eNBs, gNBs, and UEs. [Diagram 2] FIG. 1 is an exemplary diagram illustrating transmission of two PDSCHs to a single UE. [Diagram 3]FIG. 1 is an exemplary diagram showing a single PDCCH transmission from one TRP scheduling two PDSCH transmissions from two TRPs. [Figure 4] A graph showing the configuration of demodulation reference symbols for frontloading to a data channel. [Diagram 5] Block diagram showing the configuration of UE and network nodes [Figure 6] Flowchart showing a method for a terminal and a method for a network node [Figure 7] A block diagram showing an example configuration of a parameter acquisition circuit of a UE. [Figure 8] A block diagram showing an example configuration of a parameter acquisition circuit of a UE. [Figure 9] FIG. 1 shows an example of an RRC code including values ​​from a multi-TRP combination table. [Figure 10] FIG. 1 shows an example of an RRC code including values ​​of a multi-TRP combination table for DMRS indication [Figure 11] FIG. 13 is a diagram showing an example of an RRC code including values ​​from a multi-TRP combination table for TCI status indication [Figure 12] FIG. 1 shows an example of an RRC code including a multi-TRP combination table activation parameter. [Figure 13] FIG. 1 is a diagram showing an example of an RRC code including an activation parameter of a multi-TRP combination table for DMRS indication. [Figure 14] FIG. 13 is a diagram showing an example of an RRC code including an activation parameter for a multi-TRP combination table for TCI status display. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] FIG. 1 illustrates 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, a 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. Although the embodiments and exemplary implementations are described using some terminology of a 3GPP system, the present disclosure is applicable to any other communication system, in particular, any cellular system, wireless system, and / or mobile communication system.

[0013] NR is planned to facilitate the provision of a single technical framework that addresses 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, rural, urban macro, and high-speed. 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 with non-time-critical data transfer, such as smart wearables and sensor networks. eMBB and URLLC services are similar in that both require very high bandwidth, but differ in that URLLC services require 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] The terminal is called user equipment (UE) in LTE and NR. It may be a mobile device such as a mobile phone, a smartphone, a tablet computer, or a USB (Universal Serial Bus) stick with user equipment functionality. However, the term mobile device is not limited thereto, and in general, a relay may also have the functionality of such a mobile device, and a mobile device may also function as a relay.

[0015] A base station is a network node forming part of a network for providing services to terminals, for example 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 multiple transmit / receive points (multiple TRPs). For example, a user equipment can receive data from multiple TRPs (transmit / receive points), which can be controlled by the same or different network nodes. The term multi-point transmission or coordinated multi-point transmission (CoMP) can also be used for multi-TRP communication, including multi-TRP transmission.

[0017] 3GPP has specified basic support for multiple transmit / receive points (multiple TRPs) in NR Rel. 15. In NR Rel. 16, multiple TRPs can be further enhanced according to a new work item on NR MIMO (see Non-Patent Document 1).

[0018] This disclosure addresses multi-TRP communication and proposes techniques for, for example, transmission of a single PDCCH (physical downlink control channel). The single PDCCH is used to schedule data or control channels, such as PDSCH (physical downlink shared channel), PUSCH (physical uplink shared channel), PUCCH (physical uplink control channel), etc., for multiple TRPs. Some discussed techniques relate to a DMRS port indication table for mapping demodulation reference signal (DMRS) ports to multiple layers for transmission on multiple TRPs and for mapping transmission configuration indication (TCI) state signaling for multiple TRPs. Signaling modifications related to both DMRS port indication and TCI state over a single PDCCH for multi-TRP transmission / reception of data channels are described.

[0019] As mentioned above, the present disclosure is applicable in the area of ​​multiple TRP in MIMO, which involves transmitting and receiving from multiple points connected to each other by ideal or non-ideal backhaul, as described in more detail below, to coordinate transmission and / or reception to some degree.

[0020] The techniques described in this disclosure are not limited to a particular arrangement of TRPs or a particular relationship between TRPs and gNBs. Thus, 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 multi-TRP, several options are possible regarding the location relationship between the TRPs, and the distance between two TRPs may be different. For example, the TRPs may be close together, in which case the UE receives signals from these TRPs from similar angles. However, the TRPs may be located at a significant distance from each other, for example at distant locations of a network cell. A UE served by two TRPs can receive signaling from and transmit signaling to each TRP on uncorrelated channels. Thus, the channel diversity gain can be optimally utilized.

[0022] For example, multi-TRPs can be classified into two high-level categories. That is, the distinction between the 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, e.g. a dedicated point-to-point connection using optical fiber. An ideal backhaul is assumed to allow communication between TRPs with about or near 0 ms latency (e.g., for LTE-A, technical report 2013-01-13 (http: / / www.rf-rf.org / rf-reports ...

[0023] Apart from categorization into ideal and non-ideal backhaul, further categorization can be made in multi-TRP MIMO technology with respect to how the baseband circuitry is shared between TRPs. For example, two given TRPs may share the same baseband circuitry while there may be different RF (radio frequency) blocks for each of these TRPs. In this case, the link / backhaul between the RF block and the baseband circuitry may be ideal or non-ideal. Alternatively, both the baseband and RF blocks may be different for each TRP. In this case, each link between the baseband circuitry and the RF block as well as the links between the different baseband circuits may be ideal or non-ideal.

[0024] The present disclosure provides an approach that can facilitate multi-TRP operation, and in particular, can facilitate the achievement of reliability and robustness. The disclosed technology can facilitate, for example, meeting URLLC requirements by 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. The present disclosure is applicable to scenarios including one or both of ideal and non-ideal backhaul.

[0025] As described above, multiple, widely separated TRPs can enable the provision of spatial diversity gain. In particular, exploiting this spatial diversity gain can facilitate transmission and reception in the high frequency range, where interruptions to either the link or the wireless communication channel between the TRP and the UE are particularly possible. In this regard, the techniques disclosed herein can facilitate coordination between multiple points, such as TRPs, to schedule control and / or data channels.

[0026] An example of multi-TRP communication is shown in Figure 2, where multiple physical downlink data channels are transmitted from two TRPs (e.g., connected by an ideal backhaul) to a single UE.

[0027] There may be different transmission modes for multi-TRP depending on what the backhaul links between the TRPs are and whether each TRP has its own control channel (PDCCH / PUCCH) and / or data channel (PDSCH / PUSCH).

[0028] According to some agreements in RAN1#94b and RAN#95, different alternatives are under consideration for single and / or multi-PDCCH transmission for multi-TRP transmission, and it is agreed to downselect among the following options: only support single PDCCH design (in which case multi-PDCCH design can be additionally provided), only support multi-PDCCH design (in which case single PDCCH design can be additionally provided), and support both multi-PDCCH design and single PDCCH design. As a further option, a URLLC-specific PDCCH design, possibly including a specific PDCCH configuration / format or transmission scheme, is possible. The points to be considered in the above downselection include backhaul latency, downlink control overhead, spec impact (including RAN2 spec), UE complexity (in terms of power control, timing adjustment, and blind detection), DCI / UCI design, scheduler flexibility, intra-UE PUCCH / PUSCH transmission, Rel-15 PDCCH blockage probability, and CSI feedback.

[0029] The present disclosure is applicable to single PDCCH transmission in multiple TRPs. However, the PDCCH can schedule, for example, PDSCH / PUSCH / PUCCH for multiple TRPs. As shown in FIG. 3, a single PDCCH (single DCI content) is transmitted to the UE from TRP1 and schedules the respective PDSCHs (carrying respective codewords) transmitted to the UE from TRP1 and TRP2. This means that the single DCI content in the single PDCCH applies to downlink data transmission 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 the same (e.g., to facilitate obtaining spatial diversity gain). Furthermore, different layers of the same codeword may be transmitted from multiple TRPs.

[0030] In NR Rel.15, different DMRS (Demodulation Reference Signal) configurations were defined for PDSCH / PUSCH. These are called frontloaded DMRS because they occupy the first one or two symbols of the data channel, e.g., the first one or more symbols of a slot. In particular, DMRS configurations type 1 and type 2 were defined. Each configuration has both 1-symbol and 2-symbol configurations. Thus, four different DMRS patterns were defined, as shown in Figure 4. In addition, further time-domain patterns with additional DMRS symbols are also defined.

[0031] A reference signal pattern (RS) is transmitted from an antenna port (or port or DMRS port) of the base station. A port can be implemented as a single physical transmit antenna (or TRP) or as a combination of multiple physical antenna elements. In either case, the signal transmitted from each antenna port is not designed to be further resolved by the UE receiver. The transmitted RS (especially the demodulation reference signal) corresponding to a given antenna port defines the antenna port from the UE's perspective and allows the UE to derive a channel estimate for all data transmitted on 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. For ports, see also Section 8.2 of Non-Patent Document 3.

[0032] Different ports can be distinguished from each other by resource components such as cyclic shift, comb (com defines the subcarrier distinction, subcarriers with alternating subcarrier index are grouped into different combs), or orthogonal cover code (OCC). As can be seen from Figure 4, the ports are divided into CDM (Code Division Multiplexing) groups. Each CDM group uses its own OCC (e.g., Walsh-Hadamard TD (Time Division)-OCC for 2-symbol DMRS). Resource components are combined into component sets, which can be assigned to ports.

[0033] All DMRS ports in the same CDM group may be assumed to be quasi-co-located (QCL), i.e., similar assumptions are made regarding the channel correlation between the DMRS ports, e.g., with respect to Doppler shift, Doppler spread, mean delay, delay spread, etc.

[0034] When a data channel transmission is scheduled, for example a PDSCH is scheduled, 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 transmit antenna ports. Each layer is identified by a precoding vector whose magnitude is equal to the number of transmit 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 coded data block, which corresponds to a single transport block (TB) passed from the Medium Access Control (MAC) layer of the transmitter to the physical layer and is protected by a cyclic redundancy check (CRC). Typically, layers are assigned per transmission time interval (TTI), which in LTE corresponds to a subframe. However, in NR, there may be different TTIs depending on URLLC or eMBB. In particular, in NR, a TTI can be a slot, a minislot, or a subframe. For information on layers, ranks, and codewords, see also Section 11.2.2.2 of Non-Patent Document 3.

[0035] In general, the TTI determines the timing granularity for the scheduling assignment. One TTI is the time interval in 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 ms duration) consisting of 10 subframes (1 ms duration). In slot-based transmissions, subframes are instead divided into slots. The number of slots is defined by the numerology / subcarrier spacing. Specified values ​​range between 10 slots for a subcarrier spacing of 15 kHz to 320 slots for a subcarrier spacing of 240 kHz. The number of OFDM symbols per slot is 14 for normal cyclic prefix and 12 for extended cyclic prefix (see 3GPP, sections 4.1 (general frame structure), 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, the TTI in a non-slot based allocation may correspond to a mini-slot instead of a slot. That is, one or more mini-slots may be allocated to a requested transmission of data / control signaling. In a non-slot based allocation, the minimum length of the 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 3GPP TS 2011-010-010 (2011). For example, DCI format 1-1 and format 0-1 are used for scheduling PDSCH and PUSCH, respectively. These formats each contain a field called "antenna port" that is used to indicate the above table for layer-to-port mapping. The NR Rel.15 specification for mapping layer-to-port assumes single-TRP transmission. This means that the above table contains entries where a DMRS port in the same CDM group is mapped to multiple layers for transmission on a single TRP. When this mapping is applied to multi-TRP transmission, for example, when layer 1 is transmitted on TRP1 and layer 2 is transmitted on TRP2, the DMRS port mapping for these two layers is such that the two ports are assumed to be QCLs. This kind of mapping is applicable for a single TRP or multiple TRPs that are sufficiently close to each other, since multiple DMRS ports can be assumed to be QCLs.

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

[0038] DCI format 1-1 (clause 7.3.1.2.2 of 3GPP TS 2013-010666) used for scheduling PDSCH includes a field called transmission configuration indication (TCI). This TCI, if configured, is used to indicate one of eight TCI states using three bits. In the UE, a list of up to M TCI states (M=8 in the above DCI format 1-1 example, corresponding to the maximum number of three bits in the TCI field) can be configured in the higher layer (higher layer in this context means a layer higher than the physical layer) parameter PDSCH-Config, which is configured in the RRC (Radio Resource Control) signaling. Each TCI state includes parameters for configuring a quasi-co-location relationship between one or two downlink reference signals and the DM-RS port of the PDSCH. Further information on the different QCL types and other related information can be found in clause 5.1.5 of 3GPP TS 2013-0106666. Thus, a single PDCCH (single DCI) has up to 3 bits for TCI signaling to signal a QCL assumption for one TRP and indicate one of eight configured states that assume the same QCL assumption for other TRPs scheduled by the PDCCH. With such QCL assumptions, the TCI status information signaled by the DCI is particularly applicable to single-TRP transmissions, since the same QCL association may not be valid for one of the different TRPs located far away from each other. With some modifications, a single PDCCH can be used to facilitate support of independent TCI status signaling for multiple TRPs. For example, TRPs located geographically far away should have different QCL assumptions and therefore independent TCI status signaling for each TRP.

[0039] As shown in FIG. 5, the present disclosure provides a user equipment 510 having a transceiver 520 (receiver / transmitter) and a circuit 530 (processing circuit). The transceiver 520 (or “UE transceiver”), in operation, receives downlink control information (DCI) on a PDCCH to schedule multiple transmissions or receptions between a UE and multiple transmission / reception points (TRPs, e.g., TRP1 and TRP2 shown in FIG. 2 and FIG. 3) on multiple channels. The DCI includes one or more indicators that respectively indicate one or more transmission parameters. The circuit 530 (or “UE circuitry”, which may include a transmission parameter acquisition circuit 535), in operation, acquires multiple values ​​of each of the one or more transmission parameters based on the one or more indicators and configuration. The UE transceiver 520 performs the multiple transmissions or receptions using a respective one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0040] A network node 560 having a transceiver 570 and circuitry 580 is further provided and is also shown in FIG. 5. The circuitry 580 (or "network node circuitry", which may include a transmission parameter determination circuitry 585) in operation determines a plurality of values ​​of one or more transmission parameters for a plurality of transmissions or receptions between a plurality of transmission / reception points (TRPs) and a user equipment (UE) and generates downlink control information (DCI) for scheduling the plurality of transmissions or receptions. The DCI includes one or more indicators indicative of the one or more transmission parameters, respectively, which in combination with a configuration indicate the plurality of values ​​of the one or more transmission parameters. The network node transceiver 570 in operation transmits the DCI on a PDCCH.

[0041] As also shown in FIG. 5, the UE 510 and the network node 560 communicate with each other over at least one communication channel, e.g., a wireless or radio channel in a wireless or radio communication system, such as NR, LTE, LTE-A, etc.

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

[0043] Corresponding to the above-mentioned UE and network node, the present disclosure further provides a communication method for a user equipment ("UE method") and a communication method for a network node ("network node method"). Figure 6 shows method steps of the UE method and the network node method.

[0044] In step S610 of the network node method, a plurality of values ​​of one or more transmission parameters of a plurality of transmissions or receptions between a plurality of transmission / reception points (TRPs) and a user equipment (UE) is determined. In step S620 of the network node method, downlink control information (DCI) is generated for scheduling the plurality of transmissions or receptions. The DCI includes one or more indicators indicating the one or more transmission parameters, respectively, which in combination with a configuration indicate a plurality of values ​​of the one or more transmission parameters. Further, in step S630, the DCI is transmitted on a PDCCH, and in step S635 of the UE method, it is received at the UE side. In step S645 of the UE method, a plurality of values ​​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 plurality of transmissions or the plurality of receptions are performed using a respective one of the plurality of values ​​of the one or more transmission parameters for each of the plurality of transmissions or receptions.

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

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

[0047] As mentioned above, the transmission (network node) and reception (UE) of DCI on a PDCCH may be a single PDCCH in a multi-TRP communication, for example, the PDCCH scheduling multiple transmissions / receptions, each of which is performed on one of multiple channels using one of multiple TRPs, respectively.

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

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

[0050] The single-TRP configuration may include the above configuration of TCI state variables or one or more port indication tables, such as the above port indication table defined in chapter 7 of 3GPP TS 2.0, sometimes referred to as the single-TRP configuration table. The multi-TRP configuration may include further port indication 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 possibilities for the combination of configurations and parameters included in the DCI. For example, a multi-TRP configuration can provide additional pointers or parameters to a single-TRP configuration that can be included in an additionally configured table. Furthermore, for example, the interpretation of parameters in the DCI may be determined based on an activation parameter or RNTI (Radio Network Temporary Identifier) ​​included in the configuration. Based on an activation parameter or RNTI (e.g., a specific RNTI among multiple configured RNTIs) used to scramble (network node) / descramble (UE) the CRC attached to the DCI, the UE determines one (e.g., single TRP) or multiple (multiple TRP) values ​​of the parameters according to a single TRP configuration, a multi-TRP configuration, or a combination of a single TRP configuration and a multi-TRP configuration (e.g., multiple pointers to a single TRP configuration).

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

[0053] The multiple transmissions to and from the multiple TRPs may be transmissions of the same data / codeword or different data / codewords. For example, each codeword of the two codewords transmitted and received may be the same or different. Also, the same data may be transmitted / received using the same MCS (Modulation and Coding Scheme) and / or redundancy version or different MCS (Modulation and Coding Scheme) and / or redundancy version. Furthermore, different layers of a single codeword may be transmitted / received to and from different TRPs.

[0054] The multiple transmissions or receptions may be uplink or downlink transmissions / receptions of data or control information on channels such as PDSCH, PUSCH, PUCCH, etc. For example, a UE transmits data and / or control information to multiple TRPs, or multiple TRPs transmit data and / or control information to a UE.

[0055] For example, the transmissions or receptions scheduled by the DCI may be uplink transmissions from the UE to the TRPs, or the transmissions may be downlink transmissions from the TRPs to the UE. Furthermore, the transmissions / receptions scheduled by the DCI may include one or more uplink transmissions and one or more downlink transmissions.

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

[0057] Thus, in some embodiments, the network node transceiver 570 performs, during operation, at least one of the multiple transmissions or receptions using a respective one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions. The at least one transmission or reception is performed between the UE and at least one of the multiple TRPs. Thus, in these embodiments, the network node method further includes a transceiver step S660 of performing at least one (one, multiple, or each) of the multiple transmissions. In this case, one, multiple, or each, respectively, of the multiple TRPs is used.

[0058] As mentioned above, in some embodiments, the one or more transmission parameters include at least one of a demodulation reference signal (DMRS), a port indication, and a transmission configuration indication (TCI) state. Furthermore, the present disclosure provides some embodiments involving various elements, such as an RNTI, an enabling parameter in RRC signaling, a combination table that can be signaled or statically configurable in RRC, and combinations of these elements. Some embodiments are described in more detail below.

[0059] RNTI-Based Implementation

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

[0061] For example, the RNTI (particularly the numerical value of the RNTI) can correspond to the value of a transmission parameter. For example, there is a mapping between possible numerical values ​​of the RNTI, at least one of which is configurable statically or by RRC signaling. The DCI field of the same parameter can be used for the value of the parameter for a first transmission / reception with a first TRP, while the value indicated by the RNTI is the value of the parameter for a second transmission / reception with a second TRP. Additionally or alternatively, the RNTI can indicate that for the same or another transmission parameter, the corresponding field in the DCI should be interpreted as one value representing multiple (e.g., two) values ​​of the transmission parameter for multiple transmissions / receptions via multiple TRPs. The mapping between the value in the DCI and the multiple values ​​can be defined by a combination table included in the configuration.

[0062] Therefore, the present disclosure provides several embodiments based on an RNTI-based approach. Several possibilities are possible, especially regarding which RNTI is used. For example, a new UE-specific RNTI may be introduced for multi-TRP specific signaling, or a UE-specific RNTI that already provides some functionality, such as MCS-C-RNTI (MCS Cell RNTI), may be extended in terms of functionality to further indicate multi-TRP specific signaling.

[0063] The RNTI-based embodiment of the present disclosure can be implemented without additional DCI overhead. Rather than including different values ​​of a given transmission parameter in the DCI, the additional values ​​of the given parameter can be obtainable from the RNTI or from a table pointed to by the RNTI. At the same time, independent indications for different TRPs can be facilitated. Furthermore, a unified approach to issuing separate signaling (e.g., DMRS and TCI signaling) is provided, since the RNTI can be an indicator for issuing a DMRS port indication, a TCI state indication, both, or some additional fields.

[0064] For example, a new UE-specific RNTI may be configured by the RRC or an existing RNTI such as the MCS-C-RNTI may be reused to provide additional functionality, for example as described below. - scrambling with a new RNTI implies the use of a different DMRS port indication table for multiple TRPs (e.g. a different multi-TRP DMRS port indication table than the single-TRP DMRS port indication table), as described above, and / or - Indicating the TCI status of additional TRPs (e.g. TRPs not used for PDCCH transmission) using a specific RNTI value that scrambles the DCI CRC (CRC appended to the DCI), in which case more than one value can be configured for the new or existing RNTI (or derived from the configured or existing RNTI) and has extended capabilities.

[0065] A multi-TRP table (eg, a DMRS port indication table designed and defined for the multi-TRP case) may be defined in the standard.

[0066] A communication method using an RNTI-based approach to multi-TRP indication may include the following example steps. 1. If RRC does not configure a new RNTI or extend an existing RNTI (e.g. does not define additional functionality), it shall follow existing processes, e.g. use existing signaling framework (e.g. processes used for single-TRP communication, possibly including a single-TRP DMRS port indication table). 2. If the RRC configures this new RNTI or uses an extension of the existing RNTI, it performs further steps based on the result of DCI CRC descrambling. 3. If the DCI CRC is not scrambled with this RNTI, follow existing processes, eg, use existing signaling framework. 4. If the DCI CRC is scrambled with one possible value of this RNTI, then follow the procedure below. a. Use the new DMRS port mapping table. b. At descrambling time, the UE determines the RNTI value used for scrambling and calculates the TCI status of the second TRP (different from the first TRP whose DCI was signaled on the PDCCH). c. Signal the TCI state of the first TRP 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 and independently of steps b and c. Also, steps b and c may be performed without step a. In particular, depending on whether the multi-TRP RNTI is used to indicate i) a new DMRS table for the multi-TRP, ii) two TRPs or more than one TCI state value for the multi-TRP, or iii) a new DMRS table for the multi-TRP, the above steps 1 to 4 of the multi-TRP communication method may vary. In cases i) and iii), the use of the existing framework includes the use of a single-TRP DMRS port indication 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 to c. Furthermore, as described above, the RNTI is a dedicated RNTI or a predefined RNTI extended by the configured multi-TRP feature. In cases ii) and iii), the K RNTI candidate values ​​are configured or derivable from the configuration, as will be further described.

[0068] It should be noted that the present disclosure is not limited with respect to which type of indicator (DCI bit field or RNTI) applies to which TRP. For example, in contrast to the above description, the TCI bit field may be applied to a TRP that is not transmitting a PDCCH (such as the second TRP above). Figure 7 shows an example structure of the parameter acquisition circuit 535, which includes a descrambling circuit 736 and includes 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. In operation, the UE circuitry 530 uses a radio network temporary identifier (RNTI) included in or derivable from the configuration to descramble a cyclic redundancy check (CRC) appended to the DCI. The RNTI indicates that the second DMRS port indication table is used for at least one of the multiple transmissions or receptions. In operation, the UE transceiver 520 performs at least one of the multiple transmissions or receptions using the second DMRS port indication table according to a result of successfully descrambling the CRC using the RNTI. The indicator indicates the DMRS port indication from the second DMRS port indication table.

[0070] Table 1 is an exemplary DMRS port indication table that can be used for multi-TRP communication in the case of type 1 DMRS configuration and one symbol length. Thus, Table 1 is an example of the second DMRS port indication table (or "multi-TRP port indication table") described above, whereas the first DMRS port indication table may be a "single-TRP" DMRS port indication table as described above. As can be seen from FIG. 4, ports 0 and 1 are QCLs (as they are in the same CDM group), and ports 2 and 3 are also QCLs. The "Number of DMRS CDM groups without data" column indicates the number of CDM groups in which a reference signal (not data) is signaled or the number of CDM groups occupied by another UE for DMRS transmission / reception (and therefore no data for the given user equipment under consideration).

[0071] [Table 1]

[0072] The column value contains the index of the different rows corresponding to the DMRS configurations. The DMRS configurations from among the rows are dynamically scheduled to the UE by the 4-bit field of the DCI. Thus, the DMRS port indication is one of the transmission parameters based on which multiple transmissions or receptions are performed. This 4-bit field is an indicator of one of the indexes corresponding to the "Value" column indicating the DMRS port indication from the table.

[0073] Therefore, according to the result of successfully descrambling the CRC, the DMRS port indication used for multiple transmissions or receptions is derived from the second DMRS port indication table instead of the first DMRS port indication table if the RNTI used for the descrambling is an RNTI with multi-TRP capability. In this case, the indicator of the DCI indicates an entry from the "Value" column of the second DMRS port indication table instead of the first DMRS port indication table, and the value corresponds to multiple ports including multiple non-QCL ports respectively 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 such a case, different layers of the codeword are transmitted to and from different TRPs. Rows indicated by values ​​7-12 (entries 7-12) can be used for multi-TRP transmission or reception. In lines 7 and 8, the port combinations indicated, (0,2) and (0,3), are both non-QCL and can therefore be used for transmission using two ports. Entries 10-12 each show combinations that include at least two QCL ports. If these combinations are for three layers (entries 10, 11) or four layers (entry 12), the QCL ports are mapped to the same TRP, whereas ports belonging to different CDM groups are mapped to different TRPs.

[0075] However, Table 1 is merely an example, and the present disclosure may be applied using a different DMRS port indication table. For example, more than one codeword may be enabled. In this case, layers of different codewords may be mapped to different TRPs.

[0076] As noted above, instead of or in combination with the above-described derivation of the DMRS port indication value, the result of successfully descrambling the RNTI may be used to indicate the TCI state of transmission or reception with one of multiple TRPs.

[0077] In some embodiments, the indicator included in the DCI indicates a first value among multiple values ​​of the TCI state, and the RNTI is one of K RNTI candidates, a first of which is included in the configuration, with the RNTI candidate being K subsequent integers respectively indicating K configured TCI states signaled by radio resource control (RRC). In operation, the UE circuitry 530 determines the first value of the TCI state based on the indicator, and obtains the second value among the multiple values ​​of the TCI state based on a result of successfully descrambling the CRC appended to the DCI using the RNTI candidate indicating the TCI state used as the second value among the K TCI states as the RNTI.

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

[0079] The RNTI is one of K candidates (K is an integer). Because there are K possible values ​​that the RNTI can take (which the network node circuitry 580 can use to scramble the DCI CRC), the multiple RNTI candidates can be considered as a multi-valued RNTI, or an RNTI composed of two or more values. The value of the TCI state for transmitting to and receiving from the second TRP is determined based on a mapping between the candidate RNTI values ​​and the (RRC) configured TCI state.

[0080] If the RNTI is configured with more than one value, the index or parameter value of the second TCI state for the transmitting / receiving point TRP2 can be calculated as follows, while the value of the TCI state for the transmitting / receiving point TRP1 is indicated by an indicator (bit field or bitmap) included in the DCI: In the following description, K is assumed to be equal to 8, but the value of K may generally be greater than 8 (e.g., 16) or less (e.g., 4) and may vary in time according to the RRC configuration. The DCI CRC is scrambled with one of these eight values ​​(e.g., a value of 5) by the network node circuitry 580. The eight values ​​constitute a number of K RNTI candidates. - The UE receives the DCI and starts descrambling the CRC sequentially with values ​​1, 2, 3, etc. until it successfully descrambles the CRC using one of said values ​​(eg a value of 5). - The UE successfully descrambles the CRC with a value of 5 and determines a value indicating the TCI state for transmission to and from TRP2, for example by performing a mod function between values ​​5 and 8 (performing a value 5 mod 8 operation). - The result of the mod function indicates the TCI state from the RRC configured TCI state of TRP2.

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

[0082] Furthermore, as mentioned 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 the network node by another configured non-multi-TRP related RNTI, such as a C-RNTI ("non-multi-TRP-RNTI") that does not have the additional multi-TRP capability. Thus, on the UE side, the transceiver 520 can perform one or more further attempts to descramble the DCI using the non-multi-TRP RNTI. The descrambling attempt with the multi-TRP RNTI candidate can be performed before the attempt with the non-multi-TRP RNTI, or after the attempt as necessary. Using the multi-TRP RNTI candidate first can facilitate prioritization of TRP communications, for example, when channel characteristics are important enough to require frequent multi-TRP transmissions. On the other hand, using the non-multi-TRP RNTI first can facilitate accelerating or reducing the required processing when a single-TRP communication is more likely.

[0083] In the following, a method for configuring multiple RNTI candidates is described. It may be sufficient that only the first RNTI value (or RNTI candidate) is signaled to the UE by RRC. The UE may assume that K subsequent digits (e.g., integers) of the RNTI value also belong to such a multi-valued RNTI or candidate set of K RNTI candidates and can be used to scramble the RNTI (multi-TRP RNTI or possibly enhanced C-RNTI) on the network node side. The exact value of K depends on the number of TCI states configured by dynamic or semi-static indication (in RRC). From a total number of, e.g., 128 TCI states included in the static configuration (e.g., from the standard), the network node selects, e.g., 8 states and signals these 8 states to the UE by 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 example of one additional TRP, the number of RNTIs K may be equal to 8. Thus, an RNTI derivable from a 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 values, e.g., integer values ​​obtainable / derivable from the initial RNTI signaled in the RRC configuration by a mathematical operation such as increment or decrement.

[0084] However, the K RNTI candidates may also indicate multiple values ​​of TCI state, for example, for a second TRP (TRP3) and a third TRP (TRP3). Thus, if four states are RRC configured instead of the maximum number of eight states allowed, each of the 16 RNTI candidates may map to a respective TCI state combination for TRP2 and TRP3.

[0085] According to some embodiments, at least one of the DCI and RNTI indicators indicates a multi-TRP TCI state, which includes two or more TCI states for respective transmissions / receptions with two or more TRPs.

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

[0087] In another example, steps 1 to 4 above or similar steps are performed, and the TCI state index (TCI transmission parameter included in the DCI) includes information about two or more TRPs, where the TCI states signaled by the RRC may be configured differently.

[0088] For example, a TCI index corresponding to a TCI status transmission parameter may be configured to indicate TCI status information for more than one TRP. This may lead to an increase in the number of indexes, e.g., the DCI field of the TCI indication may or may not be redefined to have more than three bits. In general, the exact number of multi-TRP TCI states configured may depend on the scenario (e.g., the number of TRPs configured and / or the location of the TRPs with respect to the UE and relative to each other).

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

[0090] [Table 2]

[0091] [Table 3]

[0092] The TCI status transmission parameter of the DCI, the RNTI value with successfully descrambled CRC, or both the TCI status transmission parameter and the RNTI value may point to a multi-TRP TCI status table such as Table 3 for two TRPs, possibly according to an RRC-signaled configuration. Whether the DCI parameter and / or the 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 RRC configured.

[0093] Furthermore, as mentioned above, the multi-TRP table (Table 3) can point to the TCI states of Table 2 in the column "TCI state". In this case, since Table 3 refers to (depends on) Table 2, both types of tables can be configured or signaled by the RRC. Alternatively, the multi-TRP state may be defined in the standard and configured statically. In the latter case, the multi-TRP table may be configured in the RRC without referring to the single-TRP state from the single-TRP TCI table, but rather to the statically configured multi-TRP state (e.g. the index of the multi-TRP state in the static configuration).

[0094] Combination Table-Based Embodiment

[0095] Table 3 above maps index values ​​to combinations of TCI states that apply to a combination of TRPs. Thus, Table 3 can be considered as a combination table. In the following, some further examples and embodiments are disclosed that use a combination table to indicate values ​​for multi-TRP communication. The present disclosure shows the possibility of creating or making available an intermediate combination table by RRC for multi-TRP signaling. The general structure of a combination table can include a number of indexes, where each index of a given table corresponds to a row and indicates a combination of different TRP IDs and corresponding combinations of indices of DCI bitmap fields of given parameters (such as DMRS port indication and TCI state). When a combination table is configured and made available by RRC, the corresponding bitmap of DCI can be used to indicate an index of the new combination table instead of the original indication of the corresponding parameter / index for the single-TRP case (e.g., index in the "Value" column of Table 1 or the "Index" column of Table 2).

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

[0097] [Table 4]

[0098] [Table 5]

[0099] Examples of single TRP parameter indication tables include the DMRS Port Indication table and the TCI State Indication table (see Table 2). Note that although the Single TRP Parameter Indication Table (Table 4) has one column "Single TRP Information," such information may be split among more columns, for example in the DMRS Port Indication Table including columns of information for each of the DMRS groups that do not have data and DMRS ports.

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

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

[0102] As can be seen, Table 3 meets the structure of a general combination table (Table 5) and thus can be considered as an example of a multi-TRP combination table. Therefore, the techniques shown in the section on "Combination Table Based Embodiments" can also be applied to the combination table (Table 3) shown in the previous section of this disclosure, e.g., RRC combination table configuration, RRC signaling, activation, and indexing.

[0103] For example, the combination table may contain three columns and Z indices (Z is the same as the number of indices of the corresponding single-TRP parameter indication table) as seen in Table 5. The first column is the index signaled by the DCI. The second column is the combination of TRPs, e.g., TRP sets each containing one or more TRPs, for which the information of parameter X needs to be signaled. The third column is the combination of indices (a set of "value candidates") pointing to an existing (single-TRP) table, indicating the information of parameter X of the corresponding TRP for that index.

[0104] For each row (set of mappings), the number of TRPs in the "TRP Combination" column (second column) is the same as the number of indexes 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 list order (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] The combination table can also be called an "intermediate" combination table, because it is inserted at an intermediate position in the chain / hierarchy of references, e.g. DCI parameters → Intermediate Combination Table → Single TRP indication table (multiple values) → Static configuration.

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

[0107] An exemplary parameter obtaining circuit 535 for an embodiment in which the configuration includes a set of mappings between a set of TRPs and a set of candidate values ​​is shown in Figure 8. For example, the parameter obtaining circuit includes a combination table selection circuit (or combination table enabling circuit) 836 and a multiple value obtaining circuit 837.

[0108] For example, a set of mappings between the TRP set and the value candidate set is defined by an intermediate combination table. Each row of the combination table may 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 instruction (value of the transmission parameter), one of the TRP sets is determined / obtained to be the multiple TRPs used for transmission or reception in correspondence with one or more indexes in the “Combination of Indexes of Existing Tables of X” column of Table 5.

[0109] It can further be seen that the general combination table (Table 5) includes an entry for a single TRP (in rows with indices "0" and "1"). Thus, in addition to indicating multiple transmissions and receptions with multiple TRPs, DCI signaling in combination with the combination table can indicate a single value of a given transmission parameter for transmission or reception using one TRP. A combination table including one or more rows referencing a single TRP can facilitate flexible switching between different TRPs, and between single-TRP and multi-TRP transmission and reception.

[0110] As mentioned above, the bit field of the parameter X points to a row of the combination table, and the number of rows / indexes of the combination table may be equal to or less than the number of rows of the parameter indication table (Table 4). Thus, an embodiment using a set of mappings (combination tables) may be implemented without incurring additional DCI overhead. However, the number of rows of the combination table may generally be greater than the number of rows of the parameter indication table. In general, a flexible and scalable technique is provided that can facilitate communication between a UE and multiple TRPs. Furthermore, the set of mappings may be applicable to different DCI fields designed for single-TRP applications or not considering the multi-TRP case, and to one or more DCI fields at the same time.

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

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

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

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

[0115] However, the combination table (and not just a subset of the indexes of the statically configured combination table) may be signaled by RRC signaling. Regardless of whether the combination table is statically or RRC configured, the combination table may 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 potential values ​​(of the index) are signaled by the RRC.

[0117] For example, the RRC dynamically configures a new combination 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 RRC-configured configuration table may vary, for example, depending on the number of TRPs and the scenario. The network node dynamically indicates one index from the RRC-configured configuration table to the UE using the DCI bit field 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. As further shown in the examples of Figures 10 and 11, parameter X can be, for example, a DMR port indication and / or a TCI status. Through this information element, the UE is informed of the content of each combination table index as well as other parameters also included in this information element. Through the RRC signaling, the UE obtains information including the number of combination table indexes and the content of each combination table index (a set of corresponding TRPs and a set of value candidates (values ​​of single TRP indication table index for each row)).

[0119] If no combination table has been configured by static configuration or by RRC, the process may continue where the DCI fields directly point to a (single TRP) indication table, such as a DMRS port indication table or a configured TCI state table.

[0120] The format of the 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 of existing tables"). The format of the combination table (or combined table) may be static and the same regardless of the number of TRPs.

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

[0122] [Table 7]

[0123] [Table 8]

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

[0125] For example, a parameter may be included in a PDCCH information element (IE) to indicate to the UE whether a new combination table should be used and whether a 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 enablement of the use of this combination table may be signaled in a ControlResourceSet information element of RRC signaling. During operation, the UE transceiver 520 receives an enablement parameter signaled by RRC indicating that multiple transmissions or receptions are performed based on a set of mappings, and the UE circuitry 530 during operation determines based on the enablement parameter that multiple transmissions or receptions are performed based on a set of mappings.

[0126] Here, "parameter_X" may be a DMRS port indication, a TCI state indication, or other parameters. 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, which is used to indicate an existing DMRS port indication table, has been enabled. 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, which is used to indicate a TCI state (which can be defined in a single TRP TCI state indication table), has been enabled.

[0127] It should be noted that the respective enablement parameters do not carry the actual content / information of the respective combination table, but are merely instructions to enable the use of the combination table, which may be included, for example, in the PDSCH-Config information element, as described above.

[0128] However, there are further techniques on how the existence of a combination table or the activation of its use can be signaled to the UE. For example, a UE-specific RNTI can be newly configured or an existing RNTI can be enhanced with additional functionality to indicate the activation of a combination table, similar to the embodiment described in the previous section. If the DCI CRC is scrambled with such an RNTI, the UE assumes that a combination table is used and that a bit field of the DCI in parameter X points to the index of that combination table.

[0129] Thus, during operation, the UE circuitry 530 descrambles the CRC attached to the DCI using an RNTI included in or derivable from the configuration (the RNTI indicates that the multiple transmissions or receptions are performed based on a set of mappings (e.g., a combination table)) and determines that the multiple transmissions or receptions are performed based on a set of mappings based on the result of successfully descrambling the CRC attached to the DCI using the RNTI.

[0130] Furthermore, the RNTI functionality described in this section can be combined with the RNTI functionality described in the previous section disclosing the RNTI-based approach, e.g., the set of RNTI candidates is not a single TCI state indication table, but rather successive integers over which successive descrambling attempts by the UE are performed.

[0131] An example of DMRS port indication signaling using a combination table is shown below. Table 9 is a DMRS port indication table of configuration type 1 with a length of one symbol. This table has 16 indexes. When a combination table for DMRS port indication such as Table 10 is configured and enabled instead of directly signaling the index of the DMRS port indication table, 4 bits (i.e., the 4-bit DCI field for DMRS port indication) are used to indicate the index of the right combination table, which points to the DMRS port indication table for the two TRPs. The exact combination, the number of indexes, etc. can be configured by RRC depending on the scenario. Furthermore, it should be noted that Table 10 merely shows an example 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 mentioned above, combination tables may be used for multi-TRP TCI state signaling. Table 11 shows the indication tables available for up to eight TCI states. The three existing TCI bit fields can indicate one of the eight configuration states of Table 11 for one TRP if the TCI state combination table is not enabled. However, instead of directly signaling the index of the TCI state, if a TCI state combination table like Table 12 is enabled, the three bits of the DCI are used to indicate an index of the combination table (Table 12), which points to the TCI states of two TRPs (e.g., two separate states from Table 11). The exact combination (and which of the total available statically configured TCI states to enable), the number of indices, etc. can be configured by RRC depending on the scenario.

[0135] [Table 11]

[0136] [Table 12]

[0137] The present disclosure can be realized by software, hardware, or software in cooperation with hardware. Each functional block used in the description of each embodiment above can be realized partially or entirely by an LSI such as an integrated circuit, and each process described in each embodiment can be controlled partially or entirely by the same LSI or a combination of LSIs. The LSI may be formed as an individual chip, or one chip may be formed to include some or all of the functional blocks. The LSI may include a data input and a data output connected thereto. Here, the LSI may be called an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration. However, the technology for realizing the integrated circuit is not limited to the LSI, and may be realized using a dedicated circuit, a general-purpose processor, or a dedicated processor. In addition, a field programmable gate array (FPGA) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connection and settings of the circuit cells arranged inside the LSI may be used. The present disclosure can be realized as digital processing or analog processing. If future integrated circuit technologies replace LSI as a result of advances in semiconductor technology or other derived technologies, the future integrated circuit technologies can be used to integrate the functional blocks. Biotechnology is also applicable.

[0138] The present disclosure may be implemented by any type of apparatus, device, or system having communication capabilities, referred to as a communications apparatus.

[0139] Some non-limiting examples of such communications devices include telephones (e.g., cell 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, smart watches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, vehicles (e.g., automobiles, airplanes, ships) that provide communications capabilities, and various combinations thereof.

[0140] Communications devices are not limited to being portable or mobile, but may also include any type of apparatus, device, or system that is non-portable or fixed, such as, for example, smart home devices (e.g., appliances, lighting, smart meters, control panels), vending machines, or any other "things" in an "Internet of Things" network.

[0141] Communications may include, for example, the exchange of data via cellular systems, wireless LAN systems, satellite systems, and the like, as well as various combinations thereof.

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

[0143] Communications equipment may also include infrastructure facilities, such as base stations, access points, or any other equipment, device, or system that communicates with or controls the equipment in the non-limiting examples above.

[0144] The present disclosure provides a user equipment (UE) having: a transceiver that, during operation, receives, on a physical downlink control channel (PDCCH), downlink control information (DCI) for scheduling multiple transmissions or receptions between a user equipment (UE) and multiple transmission / reception points (TRPs) on multiple channels, the DCI including one or more indicators respectively indicative of one or more transmission parameters; and circuitry that, during operation, obtains multiple values ​​for each of the one or more transmission parameters based on the one or more indicators and a configuration, wherein the transceiver, during operation, performs the multiple transmissions or receptions using a respective one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

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

[0146] In some embodiments, the configuration includes or is derivable from a Radio Network Temporary Identifier (RNTI), and during operation, the UE circuitry uses the RNTI to descramble a 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 value of the plurality of values ​​of the transmission parameter.

[0147] In some embodiments, the configuration includes a first DMRS port indication table and a second DMRS port indication table, and the circuit, during 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 indicating that the second DMRS port indication table is used for at least one of the plurality of transmissions or receptions, and during operation, the transceiver performs the at least one of the plurality of transmissions or receptions using the second DMRS port indication table according to a result of successfully descrambling the CRC using the RNTI, and the one or more indicators indicate a DMRS port indication from the second DMRS port indication table.

[0148] For example, the indicator indicates a first value among the multiple values ​​of the TCI state, the RNTI being one of K RNTI candidates, a first of the K RNTI candidates being included in the configuration, and the RNTI candidates being K subsequent integers respectively indicating K configured TCI states signaled by a radio resource control (RRC), and during operation, the circuit determines the first value of the TCI state based on the indicator, and obtains the second value among the multiple values ​​of the TCI state based on a result of successfully descrambling the CRC appended to the DCI using the RNTI candidate indicating a TCI state to be used as a second value among the K TCI states as the RNTI.

[0149] For example, the indicator indicates a first value among the multiple values ​​of the TCI state, and during operation, 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, a first of the K RNTI candidates being included in the configuration, and the RNTI candidate being K subsequent integers respectively indicating K configured TCI states signaled by an RRC, and during operation, the circuit determines the first value of the TCI state based on the indicator, and obtains the second value among the multiple values ​​of the TCI state based on a result of successfully descrambling the CRC attached to the DCI using the RNTI candidate indicating a TCI state used as a second value 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 for two or more TRPs.

[0151] In some embodiments, the configuration includes a set of mappings between a TRP set and a value candidate set of value candidates for the one or more transmission parameters, and at least one of the one or more indicators indicates a mapping from the set of mappings between one of the TRP sets to be used as the plurality of TRPs and one of the value candidate sets to be used as the plurality of values ​​of the one or more transmission parameters used for the plurality of transmissions or receptions.

[0152] In some embodiments, the set of mappings is M mappings among N statically configured mappings, M being less than or equal to N, and the transceiver receives M indices in operation signaled by RRC, each indicative of the M mappings, and the at least one indicator indicates an index indicating a mapping between the TRPs and the values ​​of the one or more transmission parameters used for the transmissions or receptions.

[0153] In some embodiments, the transceiver, during operation, receives contents of a mapping table defining said set of mappings, said contents of said mapping table being signalled by an RRC.

[0154] For example, the transceiver, during operation, receives an enabling parameter signaled by an RRC indicating that the multiple transmissions or receptions are to be performed based on the set of mappings, and the circuit, during operation, determines, based on the enabling parameter, that the multiple transmissions or receptions are to be performed based on the set of mappings.

[0155] For example, during operation, the circuitry descrambles a cyclic redundancy check (CRC) attached to the DCI using a Radio Network Temporary Identifier (RNTI) included in or derivable from the configuration, where the RNTI indicates that the multiple transmissions or receptions are performed based on the set of mappings, and determines that the multiple transmissions or receptions are performed based on the set of mappings based on the result of successfully descrambling the CRC attached to the DCI using the RNTI.

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

[0157] The present disclosure further provides a network node having a circuit for, during operation, determining multiple values ​​of one or more transmission parameters for multiple transmissions or receptions between multiple transmission / reception points (TRPs) and a user equipment (UE) on multiple channels, and generating downlink control information (DCI) for scheduling the multiple transmissions or receptions, the DCI including one or more indicators indicative of the one or more transmission parameters, respectively, the one or more indicators in combination with a configuration indicative of the multiple values ​​of the one or more transmission parameters, and a transceiver for, during operation, transmitting 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 a respective 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 transmission parameters include at least one of a demodulation reference signal (DMRS) port indication and a transmission configuration indication (TCI) state.

[0160] In some embodiments, the configuration includes or the RNTI is derivable from the configuration, and in operation the network node circuitry uses the RNTI to scramble a 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 value of the plurality of values ​​of the transmission parameter.

[0161] In some embodiments, the configuration includes a first DMRS port indication table and a second DMRS port indication table, and in operation, the circuit scrambles a cyclic redundancy check (CRC) 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 indication table is used for at least one of the multiple transmissions or receptions.

[0162] In some embodiments, the indicator indicates a first value among the multiple values ​​of the TCI state, and the RNTI is one of K RNTI candidates, a first of the K RNTI candidates being included in the configuration, and the RNTI candidates are K subsequent integers respectively indicating K configured 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 for two or more TRPs.

[0164] In some embodiments, the configuration includes a set of mappings between a TRP set and a value candidate set of value candidates for the one or more transmission parameters, and at least one of the one or more indicators indicates a mapping from the set of mappings between one of the TRP sets to be used as the plurality of TRPs and one of the value candidate sets to be used as the plurality of values ​​of the one or more transmission parameters used for the plurality of transmissions or receptions.

[0165] In some embodiments, the set of mappings is M mappings among N statically configured mappings, M being less than or equal to N, and the transceiver transmits M indices during operation, each indicative of the M mappings signaled by RRC, and the at least one indicator indicates an index indicating a mapping between the TRPs and the values ​​of the one or more transmission parameters used for the transmissions or receptions.

[0166] In some embodiments, the transceiver, during operation, transmits contents of a mapping table defining said set of mappings, said contents of said mapping table being signalled by an RRC.

[0167] For example, the transceiver, during operation, transmits enabling parameters signaled by the RRC indicating that the transmissions or receptions are performed based on the set of mappings.

[0168] For example, during operation, the circuitry scrambles 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 indicating that the multiple transmissions or receptions are performed based on the set of mappings.

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

[0170] The present disclosure further provides a communication method for a user equipment, the method comprising: receiving, on a physical downlink control channel (PDCCH), downlink control information (DCI) for scheduling multiple transmissions or receptions between the UE and multiple transmission / reception points (TRPs) on multiple channels, where the DCI includes one or more indicators respectively indicative of one or more transmission parameters; obtaining multiple values ​​for each of the one or more transmission parameters based on the one or more indicators and a configuration; and performing the multiple transmissions or receptions using a respective one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0171] In some embodiments, the one or more transmission parameters include at least one of a demodulation reference signal (DMRS) port indication and a transmission 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, the RNTI alone or in combination with the at least one indicator in the DCI signaling indicating at least one value of the plurality of values ​​of the transmission parameter.

[0173] In some embodiments, the configuration includes a first DMRS port indication table and a second DMRS port indication table, and the method includes descrambling a cyclic redundancy check (CRC) attached 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 indication table is used for at least one of the plurality of transmissions or receptions, and performing the at least one of the plurality of transmissions or receptions using the second DMRS port indication table according to a result of successfully descrambling the CRC using the RNTI, where the one or more indicators indicate a DMRS port indication from the second DMRS port indication table.

[0174] For example, the indicator indicates a first value among the multiple values ​​of the TCI state, the RNTI being one of K RNTI candidates, a first of the K RNTI candidates being included in the configuration, and the RNTI candidates being K subsequent integers respectively indicating K configured TCI states signaled by a 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 among the multiple values ​​of the TCI state based on a result of successfully descrambling the CRC appended to the DCI using the RNTI candidate indicating a TCI state to be used as a second value among the K TCI states as the RNTI.

[0175] For example, the indicator indicates a first value from among the multiple values ​​of the TCI state, and during operation, 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, a first of the K RNTI candidates being included in the configuration, and the RNTI candidate being K subsequent integers respectively indicating K configured TCI states signaled by an RRC, and the method includes determining the first value of the TCI state based on the indicator, and obtaining the second value from among the multiple values ​​of the TCI state based on a result of successfully descrambling the CRC attached to the DCI using the RNTI candidate indicating a TCI state used as a 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 for two or more TRPs.

[0177] In some embodiments, the configuration includes a set of mappings between a TRP set and a value candidate set of value candidates for the one or more transmission parameters, and at least one of the one or more indicators indicates a mapping from the set of mappings between one of the TRP sets to be used as the plurality of TRPs and one of the value candidate sets to be used as the plurality of values ​​of the one or more transmission parameters used for the plurality of transmissions or receptions.

[0178] In some embodiments, the set of mappings is M mappings among N statically configured mappings, M being less than or equal to N, and the method includes receiving M indices respectively indicating the M mappings signaled by an RRC, and the at least one indicator indicates an index indicating a mapping between the TRPs and the values ​​of the one or more transmission parameters used for the transmissions or receptions.

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

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

[0181] For example, the method may include descrambling a cyclic redundancy check (CRC) attached to the DCI using a Radio Network Temporary Identifier (RNTI) included in or derivable from the configuration, where the RNTI indicates that the multiple transmissions or receptions are performed based on the set of mappings, and determining that the multiple transmissions or receptions are performed based on the set of mappings based on a result of successfully descrambling the CRC attached to the DCI using the RNTI.

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

[0183] The present disclosure further provides a communications method for a network node to determine multiple values ​​of one or more transmission parameters for multiple transmissions or receptions between multiple transmission / reception points (TRPs) and a user equipment (UE) on multiple channels, generate downlink control information (DCI) for scheduling the multiple transmissions or receptions, wherein the DCI includes one or more indicators indicative of the one or more transmission parameters, respectively, the one or more indicators in combination with a configuration indicative of the multiple values ​​of the one or more transmission parameters, and transmit 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 a respective 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 transmission parameters include at least one of a demodulation reference signal (DMRS) port indication and a transmission 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 attached to the DCI, the RNTI alone or in combination with the at least one indicator in the DCI signaling indicating at least one value of the plurality of values ​​of the transmission parameter.

[0187] In some embodiments, the configuration includes a first DMRS port indication table and a second DMRS port indication table, and the method includes scrambling 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 indicating that the second DMRS port indication table is used for at least one of the multiple transmissions or receptions.

[0188] In some embodiments, the indicator indicates a first value among the multiple values ​​of the TCI state, and the RNTI is one of K RNTI candidates, a first of the K RNTI candidates being included in the configuration, and the RNTI candidates are K subsequent integers respectively indicating K configured 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 for two or more TRPs.

[0190] In some embodiments, the configuration includes a set of mappings between a TRP set and a value candidate set of value candidates for the one or more transmission parameters, and at least one of the one or more indicators indicates a mapping from the set of mappings between one of the TRP sets to be used as the plurality of TRPs and one of the value candidate sets to be used as the plurality of values ​​of the one or more transmission parameters used for the plurality of transmissions or receptions.

[0191] In some embodiments, the set of mappings is M mappings among N statically configured mappings, M being less than or equal to N, and the method includes transmitting M indexes respectively indicating the M mappings signaled by RRC, and the at least one indicator indicates an index indicating a mapping between the TRPs and the values ​​of the one or more transmission parameters used for the transmissions or receptions.

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

[0193] For example, the method includes transmitting an enabling parameter signaled by an RRC indicating that the multiple transmissions or receptions are performed based on the set of mappings.

[0194] For example, the method may include scrambling 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 indicating that the multiple transmissions or receptions are performed based on the set of mappings.

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

[0196] In summary, the present disclosure relates to a user equipment (UE), a network node, and a communication method for the UE and the network node, respectively, the UE having a transceiver that, during operation, receives on a physical downlink control channel (PDCCH) downlink control information (DCI) for scheduling a plurality of transmissions or receptions between the UE and a plurality of transmission / reception points (TRPs) on a plurality of channels, the DCI including one or more indicators indicative of one or more transmission parameters, respectively, and a circuit that, during operation, obtains a plurality of values ​​of each of the one or more transmission parameters based on the one or more indicators and a configuration. The transceiver, during operation, performs the plurality of transmissions or receptions using a respective one of the plurality of values ​​of the one or more transmission parameters for each of the plurality of transmissions or receptions.

Claims

1. a transceiver for transmitting downlink control information on a physical downlink control channel, the downlink control information including one or more indicators relating to one or more transmission parameters and a transmission configuration indication field; and a control circuit that determines the one or more transmission parameters based on the one or more indicators and a configuration indicated by the transmission configuration indication field; the transceiver performs transmission or reception using the one or more transmission parameters; If the configuration indicated by the transmission configuration indication field corresponds to single, the one or more transmission parameters are determined using a first table; If the configuration indicated by the transmission configuration indication field corresponds to a plurality of 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 an index in the second table is the same as the number of bits representing an index in the first table; Terminal.

2. The one or more transmission parameters include an antenna port number of a demodulation reference signal. The terminal according to claim 1.

3. each of the modified or added entries for the second table indicating a plurality of antenna port numbers of demodulation reference signals; The terminal according to claim 1.

4. Some values ​​of the transmission configuration indication field indicate a single case, and other values ​​indicate a multiple case. The terminal according to claim 1.

5. transmitting downlink control information on a physical downlink control channel, the downlink control information including one or more indicators relating to one or more transmission parameters and a transmission configuration indication field; determining the one or more transmission parameters based on the one or more indicators and the configuration indicated by the transmission configuration indication field; performing transmission or reception using the one or more transmission parameters; If the configuration indicated by the transmission configuration indication field corresponds to single, the one or more transmission parameters are determined using a first table; If the configuration indicated by the transmission configuration indication field corresponds to a plurality of 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 an index in the second table is the same as the number of bits representing an index in the first table; Communication methods.

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

7. each of the modified or added entries for the second table indicating a plurality of antenna port numbers of demodulation reference signals; The communication method according to claim 5.

8. Some values ​​of the transmission configuration indication field indicate a single case, and other values ​​indicate a multiple case. The communication method according to claim 5.

9. transmitting downlink control information on a physical downlink control channel, the downlink control information including one or more indicators related to one or more transmission parameters and a transmission configuration indication field; determining the one or more transmission parameters based on the one or more indicators and the configuration indicated by the transmission configuration indication field; performing transmission or reception using the one or more transmission parameters; Control the If the configuration indicated by the transmission configuration indication field corresponds to single, the one or more transmission parameters are determined using a first table; If the configuration indicated by the transmission configuration indication field corresponds to a plurality of 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 an index in the second table is the same as the number of bits representing an index in the first table; Integrated circuits.

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