Expanding uplink transmission with multiple beams

Abstract

The present disclosure provides a communications apparatus and method for enhancing uplink transmissions using multiple beams, the communications apparatus comprising: a transceiver unit that, in operation, receives control information indicating two or more beams for uplink transmissions; and a circuit that, in operation, uses the two or more beams for multiple uplink transmission occasions in response to satisfying at least one condition for beam switching based on the control information.

Description

[Technical Field]

[0001] The following disclosure relates to a communication apparatus and a communication method for New Radio (NR) communication, and more particularly to a communication apparatus and a communication method for enhancing uplink transmission using multiple beams. [Background technology]

[0002] Release 15 (Rel. 15) of the 3rd Generation Partnership Project (3GPP) supports slot-level (inter-slot) repetition, i.e., repetition type A, in which different repeated transmissions are performed in different slots with the same length and the same starting symbol. Such repetition applies to the physical downlink shared channel (PDSCH), the physical uplink control channel (PUCCH), and the physical uplink shared channel (PUSCH).

[0003] In 3GPP Release 16 (Rel. 16), minislot-level (intra-minislot) repetition is supported only for PUSCH, i.e., PUSCH repetition type B. The nominal repetition of PUSCH can be divided into multiple actual repetitions based on crossing slot boundaries or invalid symbols.

[0004] For both PUSCH repetition types A and B, the following observation (Observation 1) can be made according to the current Rel. 15 / 16 standard: all PUSCH repetitions are assumed to use the same uplink (UL) beam and the same UL transmission parameter set, as shown in Figure 6. Similarly, Observation 1 still holds for PUCCH repetitions.

[0005] According to the agreement in TS 365, a performance and standard impact study for time-domain based solutions for PUSCH extension is prioritized, including (i) increasing the number of repetitions for PUSCH repetition type A, such as PUSCH repetition using non-contiguous slots / PUSCH repetition based on available slots for time division duplex (TDD) (note that increasing the number of PUSCH repetitions for frequency division duplex (FDD) depends on the outcome of agenda item 8.8.1.1 from the Chair's Note in TS 365), (ii) extending PUSCH repetition type B, such as actual repetition across slot boundaries or actual repetition length greater than 14 symbols, and (iii) processing of transport blocks (TBs) over at least a mini-slot PUSCH (e.g., a single TB sized for a single slot but partially transmitted across multiple slots and a single TB sized for multiple slots transmitted across multiple slots).

[0006] The agreement also discusses topics for further study, such as repetition based on spreading with Orthogonal Cover Codes (OCC), symbol-level repetition, TB interleaving, repetition with redundancy versions (RV), and early termination of PUSCH repetition. [Prior art documents] [Non-patent literature]

[0007] [Non-Patent Document 1] RAN1#102-e [Non-patent document 2] 3GPP TS 38.300 v16.3.0 [Non-patent document 3] 3GPP TS 38.211 v16.3.0 [Non-patent document 4] TS 23.502 [Non-Patent Document 5] ITU-R M.2083 [Non-patent document 6] TR 38.913 [Non-Patent Document 7] TS 23.287 v16.4.0 [Non-patent document 8] 3GPP technical specification (TS) 38.214 [Non-Patent Document 9] TS 38.213 Summary of the Invention [Problem to be solved by the invention]

[0008] In Rel.16, for the downlink (DL), multiple Physical Downlink Shared Channel (PDSCH) transmissions of the TB from separate transmission points are only supported. For the UL, multiple PUSCH transmissions of the TB using separate beams are not supported in the Rel.15 / 16 standard.

[0009] Therefore, there is a need to develop new communications devices and methods for addressing one or more of the above problems and for enhancing uplink transmissions using multiple beams. Furthermore, other desirable features and characteristics will become apparent from the following detailed description and the appended claims, taken in conjunction with the accompanying drawings and the background of this disclosure. [Means for solving the problem]

[0010] One non-limiting exemplary embodiment of the present invention serves to provide a communications apparatus and method for extending UL transmissions using multiple beams.

[0011] In a first aspect, the present disclosure provides a communications device comprising: a transceiver that, in operation, receives control information indicating two or more beams for uplink transmission; and a circuit that, in operation, uses the two or more beams for multiple uplink transmission occasions in response to satisfying at least one condition for beam switching based on the control information.

[0012] In a second aspect, the present disclosure provides a communication method that receives control information indicating two or more beams for uplink transmission, and uses the two or more beams for multiple uplink transmission occasions in response to satisfying at least one condition for beam switching based on the control information.

[0013] It should be noted that the general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

[0014] 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 the various embodiments and features of the specification and drawings, and it is not necessary for all embodiments and features to be present in order to obtain one or more of such benefits and / or advantages. [Brief explanation of the drawings]

[0015] Embodiments of the present disclosure, by way of example only, will be better understood and readily apparent to those skilled in the art from the following description and in conjunction with the drawings in which: [Figure 1] FIG. 1 illustrates an exemplary 3GPP NR-RAN architecture. [Figure 2]FIG. 1 is a schematic diagram showing the functional division between NG-RAN and 5GC. [Figure 3] Sequence diagram of the radio resource control (RRC) connection setup / reconfiguration procedure [Figure 4] Schematic diagram showing usage scenarios for enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), and Ultra Reliable and Low Latency Communications (URLLC) [Figure 5] Block diagram illustrating an exemplary 5G system architecture for V2X communications in a non-roaming scenario [Figure 6] FIG. 1 illustrates exemplary Physical Uplink Shared Channel (PUSCH) repetition types A and B, where the same uplink (UL) beam is applied to all repetitions of the PUSCH. [Figure 7] 1 is a schematic diagram illustrating an exemplary shielding of multiple beams for uplink transmission. [Figure 8] 1 illustrates a schematic example of a communications device according to various embodiments, which may be implemented as a UE or a gNB / base station and configured to extend uplink transmissions using multiple beams in accordance with various embodiments of the present disclosure. [Figure 9] 1 is a flow diagram illustrating a communication method for enhancing uplink transmission using multiple beams, in accordance with various embodiments of the present disclosure. [Figure 10] FIG. 1 illustrates a PUSCH repetition type A in which two beams are used according to a first example of the first embodiment of the present disclosure. [Figure 11] FIG. 11 is a schematic diagram illustrating two beams mapped to two iterations of FIG. 10 under a multiple TRP (Transmission Reception Point) transmission scenario according to a first example of the first embodiment of the present disclosure. [Figure 12]FIG. 1 illustrates an exemplary configuration of time domain resource allocation for beam switching for multiple uplink transmission occasions according to a first embodiment of the present disclosure. [Figure 13] FIG. 10 illustrates an exemplary configuration of new invalid symbols in uplink transmission occasions under PUSCH repetition type B according to a second embodiment of the present disclosure. [Figure 14A] Figure 10 shows PUSCH repetition type B with invalid symbols in Rel. 16 [Figure 14B] FIG. 10 illustrates PUSCH repetition type B with new invalid symbols according to an example of the second embodiment of the present disclosure. [Figure 15A] Figure 10 shows PUSCH repetition type B with invalid symbols in Rel. 16 [Figure 15B] FIG. 10 illustrates PUSCH repetition type B with invalid symbols of Rel. 16 and new invalid symbols according to another example of the second embodiment of the present disclosure. [Figure 15C] FIG. 10 illustrates PUSCH repetition type B with invalid symbols of Rel. 16 and new invalid symbols according to yet another example of the second embodiment of the present disclosure. [Figure 16] FIG. 10 illustrates an exemplary symbol level repetition according to a third embodiment of the present disclosure. [Figure 17] FIG. 10 illustrates an exemplary PUSCH allocation configuration for beam switching for multiple uplink transmission occasions according to a third embodiment of the present disclosure.

[0016] Those skilled in the art will appreciate that the elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures, block diagrams, or flowcharts may be exaggerated relative to other elements to help improve understanding of the embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0017] Some embodiments of the present disclosure will now be described, by way of example only, with reference to the drawings in which like reference numbers and letters indicate similar or equivalent elements.

[0018] 3GPP continues work on the next release of fifth-generation cellular technology (also known simply as "5G"), which includes the development of New Radio Access Technology (NR) operating in the frequency range up to 100 GHz. The first version of the 5G standard was completed in late 2017, allowing for the prototyping and commercial deployment of 5G NR-compliant smartphones. The second version of the 5G standard was completed in June 2020, further expanding the reach of 5G to new services, spectrum, and deployments such as unlicensed spectrum (NR-U), non-public networks (NPN), time-sensitive networking (TSN), and cellular V2X.

[0019] In particular, the system architecture as a whole assumes an NG-RAN (Next Generation-Radio Access Network) including gNBs. The gNBs provide UE-side termination of NG radio access user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocols. The gNBs are connected to each other via an Xn interface. The gNBs are also connected to an NGC (Next Generation Core) via a Next Generation (NG) interface, more specifically to an AMF (Access and Mobility Management Function) (e.g., a specific core entity that performs AMF) via an NG-C interface, and to a UPF (User Plane Function) (e.g., a specific core entity that performs UPF) via an NG-U interface. The NG-RAN architecture is shown in Figure 1 (see, for example, Non-Patent Document 2).

[0020] The NR user plane protocol stack (see, for example, Section 4.4.1 of Non-Patent Document 2) includes a Packet Data Convergence Protocol (PDCP) sublayer (see, for example, Section 6.4 of Non-Patent Document 2), a Radio Link Control (RLC) sublayer (see, for example, Section 6.3 of Non-Patent Document 2), and a Medium Access Control (MAC) sublayer (see, for example, Section 6.2 of Non-Patent Document 2), which are terminated on the network side at the gNB. A new Access Stratum (AS) sublayer (Service Data Adaptation Protocol (SDAP)) is also introduced on top of PDCP (see, for example, Section 6.5 of Non-Patent Document 2). A control plane protocol stack is also defined for NR (see, for example, Section 4.4.2 of Non-Patent Document 2). An overview of Layer 2 functions is described in Section 6 of Non-Patent Document 2. The functions of the PDCP sublayer, RLC sublayer, and MAC sublayer are listed in Sections 6.4, 6.3, and 6.2 of Non-Patent Document 2, respectively. The functions of the RRC layer are listed in section 7 of Non-Patent Document 2.

[0021] For example, the Medium-Access-Control layer handles logical channel multiplexing and scheduling and scheduling-related functions, including handling various numerologies.

[0022] For example, the physical layer (PHY) is responsible for coding, PHY hybrid automatic repeat request (HARQ) processing, modulation, multi-antenna processing, and mapping of signals to the appropriate physical time-frequency resources. The physical layer also handles mapping of transport channels to physical channels. The physical layer provides services to the MAC layer in the form of transport channels. A physical channel corresponds to a set of time-frequency resources used for the transmission of a particular transport channel, and each transport channel is mapped to a corresponding physical channel. For example, the physical channels are the Physical Random Access Channel (PRACH), the Physical Uplink Shared Channel (PUSCH), and the Physical Uplink Control Channel (PUCCH) in the uplink, the Physical Downlink Shared Channel (PDSCH), the Physical Downlink Control Channel (PDCCH), and the Physical Broadcast Channel (PBCH) in the downlink, and the Physical Sidelink Shared Channel (PSSCH), the Physical Sidelink Control Channel (PSCCH), and the Physical Sidelink Feedback Channel (PSFCH) in the sidelink (SL).

[0023] NR use cases / deployment scenarios may include enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communication (mMTC), which have diverse requirements in terms of data rate, latency, and coverage. For example, eMBB is expected to support peak data rates (20 Gbps in the downlink and 10 Gbps in the uplink) and effective (user-experienced) data rates that are approximately three times higher than those offered by IMT-Advanced. On the other hand, for URLLC, more stringent requirements are placed on ultra-low latency (0.5 ms for user plane latency in both UL and DL) and high reliability (1-10 ms within 1 ms). -5 Finally, mMTC is preferably designed for high connection density (1,000,000 devices / km in urban environments). 2 ), wide coverage in adverse environments, and extremely long battery life (15 years) for low-cost devices may be desired.

[0024] Therefore, OFDM numerology (e.g., subcarrier spacing, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval) suitable for one use case may not be valid for another use case. For example, low-latency services may preferably require a shorter symbol length (and therefore a larger subcarrier spacing) and / or fewer symbols per scheduling interval (also called TTI) than mMTC services. Furthermore, deployment scenarios with large channel delay spreads may preferably require a longer CP length than scenarios with small delay spreads. The subcarrier spacing should be optimized accordingly to maintain similar CP overhead. NR may support one or more subcarrier spacing values. Correspondingly, subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, etc. are currently considered. The symbol length T u and the subcarrier spacing Δf is given by the formula Δf=1 / T u Similar to LTE systems, the term "resource element" can be used to mean the smallest resource unit consisting of one subcarrier for the length of one OFDM / SC-FDMA symbol.

[0025] In the new wireless system 5G-NR, for each numerology and each carrier, a resource grid of subcarriers and OFDM symbols is defined for each uplink and downlink. Each element of the resource grid is called a resource element and is identified based on a frequency index in the frequency domain and a symbol position in the time domain (see Non-Patent Document 3).

[0026] Figure 2 shows the functional separation between NG-RAN and 5GC. The logical node of NG-RAN is gNB or ng-eNB. 5GC has logical nodes AMF, UPF, and SMF.

[0027] In particular, the gNB and ng-eNB host the following main functions: - Radio Resource Management functions such as Radio Bearer Control, Radio Admission Control, Connection Mobility Control, dynamic allocation (scheduling) of resources to UEs in both uplink and downlink; - IP header compression, encryption, and integrity protection of data; - AMF selection at UE attach time if routing to the AMF cannot be determined from the information provided by the UE; - Routing of user plane data towards UPF; - Routing of control plane information towards AMF; - Setting up and tearing down connections; - scheduling and sending of paging messages; - Scheduling and transmission of system broadcast information (originating from AMF or Operation, Admission, and Maintenance Function (OAM)); - Setting up measurements and reporting of measurements for mobility and scheduling; - Transport level packet marking in the uplink; - Session management; - Network slicing support; - QoS flow management and mapping to data radio bearers; - Support for UEs in RRC_INACTIVE state; - Non-Access Stratum (NAS) message delivery functions; - Sharing of radio access networks; - Dual connectivity; - Close cooperation between NR and E-UTRA.

[0028] The Access and Mobility Management Function (AMF) hosts the following main functions: - Terminating Non-Access Stratum (NAS) signaling; - NAS signaling security; - Access Stratum (AS) security control; - 3GPP Core Network (CN) inter-node signaling for mobility between access networks; - Reachability to idle mode UEs (including control and execution of paging retransmissions); - Managing the registration area; - Support for intra-system and inter-system mobility; - Access authentication; - Access authorization, including checking roaming privileges; - Mobility management control (subscription and policy); - Network slicing support; - Selection of Session Management Function (SMF).

[0029] Additionally, the User Plane Function (UPF) hosts the following main functions: - Anchor points for intra-RAT / inter-RAT mobility (if applicable); - External PDU (Protocol Data Unit) session points for interconnection with data networks; - Packet routing and forwarding; - Packet inspection and policy rule enforcement for the user plane part; - Traffic usage reporting; - uplink classifier that supports routing of traffic flows to the data network; - Branching Point to support multi-homed PDU sessions; - QoS processing for the user plane (e.g., packet filtering, gating, UL / DL rate enforcement); - Uplink traffic validation (mapping of SDF to QoS flows); - Downlink packet buffering and downlink data notification triggering functions.

[0030] Finally, the Session Management Function (SMF) hosts the following main functions: - Session management; - Allocation and management of IP addresses for UEs; - UPF selection and control; - Ability to configure traffic steering in the User Plane Function (UPF) to route traffic to the appropriate destination; - Controls policy enforcement and QoS; - Notification of downlink data.

[0031] Figure 3 shows some of the interactions between the UE, gNB, and AMF (5GC entity) when the UE transitions from RRC_IDLE to RRC_CONNECTED in the NAS part (see Non-Patent Document 2). The transition steps are as follows: 1. The UE requests to set up a new connection from the RRC_IDLE state. 2 / 2a. The gNB completes the RRC setup procedure. (Note: Scenarios in which the gNB may reject a request are described below.) 3. The first NAS message from the UE, sent in piggyback fashion in RRCSetupComplete, is sent to the AMF. 4 / 4a / 5 / 5a. Additional NAS messages may be exchanged between the UE and the AMF (see non-patent document 4). 6. The AMF prepares and sends UE context data (including PDU session context, security keys, UE radio capabilities, and UE security capabilities, etc.) to the gNB. 7 / 7a.gNB activates AS security with UE. 8 / 8a.gNB performs reconfiguration to set up SRB2 and DRB. 9. The gNB notifies the AMF that the setup procedure is complete.

[0032] RRC is a higher layer signaling protocol used to configure the UE and the gNB. In particular, with this transition, the AMF prepares UE context data (including, for example, PDU session context, security keys, UE radio capabilities, and UE security capabilities) and sends it to the gNB with an INITIAL CONTEXT SETUP REQUEST. The gNB then activates AS security with the UE. This is done by the gNB sending a SecurityModeCommand message to the UE, and the UE responding with a SecurityModeComplete message. The gNB then sends an RRCReconfiguration message to the UE, and upon receiving an RRCReconfigurationComplete from the UE, the gNB reconfigures the UE to set up a Signaling Radio Bearer 2 (SRB2) and a Data Radio Bearer (DRB). For signaling-only connections, the RRCReconfiguration steps are omitted because SRB2 and DRB are not set up. Finally, the gNB notifies the AMF that the setup procedure is complete with an INITIAL CONTEXT SETUP RESPONSE.

[0033] Figure 4 illustrates some use cases for 5G NR. The 3rd Generation Partnership Project New Radio (3GPP NR) is considering three use cases envisioned by IMT-2020 to support a wide variety of services and applications. The first phase of standards development for enhanced mobile broadband (eMBB) has been completed. Current and future work includes standardization for ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC), in addition to expanding support for eMBB. Figure 4 illustrates some examples of expected usage scenarios for IMT beyond 2020 (see, for example, Figure 2 in Non-Patent Document 5).

[0034] URLLC use cases have stringent performance requirements such as throughput, latency, and availability, and are envisioned as one of the necessary enablers for future applications such as wireless control of industrial production or manufacturing processes, remote medical surgery, automated power transmission and distribution in smart grids, and road safety. URLLC's ultra-high reliability is supported by identifying technologies that meet the requirements set by [Non-Patent Document 6]. Key requirements for NR URLLC in Release 15 include a target user plane latency of 0.5 ms on the uplink (UL) and 0.5 ms on the downlink (DL). A typical URLLC requirement for a single packet transmission is a block error rate (BLER) of 1E-5 for a 32-byte packet size with a user plane latency of 1 ms.

[0035] From a physical layer perspective, reliability can be improved in many possible ways. Current room for reliability improvement includes defining a separate CQI table for URLLC, a more compact DCI format, PDCCH repetition, etc. However, this room can be expanded to achieve ultra-high reliability as NR (with respect to the key requirements of NR URLLC) becomes more stable and developed. Specific use cases for NR URLLC in Release 15 include augmented reality / virtual reality (AR / VR), e-health, e-safety, and mission-critical applications.

[0036] Additionally, technology enhancements targeted by NR URLLC aim to improve latency and reliability. Technology enhancements for latency improvement include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplink, slot-level repetition in the data channel, and preemption in the downlink. Preemption means that a transmission with already allocated resources is stopped and the allocated resources are used for another transmission with a later requested lower latency / higher priority requirement. Thus, a previously allowed transmission is preempted by a later transmission. Preemption is applicable regardless of the specific service type. For example, a transmission of service type A (URLLC) may be preempted by a transmission of service type B (eMBB, etc.). Technology enhancements for reliability improvement include dedicated CQI / MCS tables for a target BLER of 1E-5.

[0037] The use case for massive machine-type communication (mMTC) is characterized by a very large number of connected devices that typically transmit relatively small amounts of data that are not sensitive to latency. These devices are required to be low cost and have very long battery life. From an NR perspective, using very narrow bandwidth portions is one solution that saves power and allows for long battery life from the UE perspective.

[0038] As mentioned above, the scope of reliability improvement in NR is expected to become broader. One of the key requirements for all cases, especially for URLLC and mMTC, is high or ultra-high reliability. Several mechanisms can improve reliability from a radio perspective and a network perspective. Generally, there are two to three key areas that can help improve reliability. These areas include compact control channel information, data channel / control channel repetition, and diversity in the frequency, time, and / or spatial domains. These areas are generally applicable to reliability improvement regardless of the specific communication scenario.

[0039] Further use cases with more stringent requirements are envisioned for NR URLLC, such as factory automation, transportation, and power distribution. The stringent requirements include high reliability (10 -6 level of reliability), high availability, packet sizes up to 256 bytes, time synchronization up to a few microseconds (depending on the use case, the value can be 1 microsecond or a few microseconds depending on the frequency range and low latency in the 0.5ms-1ms range (especially for targeted user plane latency of 0.5ms).

[0040] Furthermore, for NR URLLC, there are several possible technology enhancements from the physical layer perspective. These include PDCCH (Physical Downlink Control Channel) enhancements for compact DCI, PDCCH repetition, and increased PDCCH monitoring. Also, UCI (Uplink Control Information) enhancements relate to enhanced Hybrid Automatic Repeat Request (HARQ) and CSI feedback enhancements. There are also possible PUSCH enhancements related to minislot (intra-slot) level hopping and retransmission / repetition enhancements. The term "minislot" refers to a Transmission Time Interval (TTI) that contains fewer symbols than a slot (a slot comprises 14 symbols).

[0041] The 5G Quality of Service (QoS) model is based on QoS flows and supports both QoS flows that require a guaranteed flow bit rate (GBR (Granteed Bit Rate) QoS flow) and QoS flows that do not require a guaranteed flow bit rate (non-GBR QoS flow). Therefore, at the NAS level, a QoS flow is the finest granularity of QoS classification in a PDU session. A QoS flow is identified within a PDU session by a QoS Flow ID (QFI) carried in the encapsulation header over the NG-U interface.

[0042] For each UE, the 5GC establishes one or more PDU sessions. For each UE, the NG-RAN establishes at least one Data Radio Bearer (DRB) for each PDU session, e.g., as shown above with reference to Figure 3. Additional DRBs for the QoS flows of that PDU session can be configured later (when this is up to the NG-RAN). The NG-RAN maps packets belonging to different PDU sessions to different DRBs. NAS-level packet filters in the UE and the 5GC associate UL packets and DL packets with QoS flows, while AS-level mapping rules in the UE and the NG-RAN associate UL QoS flows and DL QoS flows with DRBs.

[0043] Figure 5 shows the non-roaming reference architecture for 5G NR (see Section 4.2.1.1 of Non-Patent Document 7). An Application Function (AF) (e.g., an external application server hosting 5G services as illustrated in Figure 4) interacts with the 3GPP core network to provide services, for example, to support application influence on traffic routing, access to a Network Exposure Function (NEF), or to interact with a policy framework for policy control (e.g., QoS control) (see Policy Control Function (PCF)). Based on the operator's deployment, Application Functions that are considered trusted by the operator can interact directly with the relevant Network Functions. Application Functions that are not permitted by the operator to directly access Network Functions interact with the relevant Network Functions using an external exposure framework via the NEF.

[0044] Figure 5 further illustrates additional functional units of the 5G architecture for V2X communication, namely, Unified Data Management (UDM), Policy Control Function (PCF), Network Exposure Function (NEF), Application Function (AF), Unified Data Repository (UDR), Access and Mobility Management Function (AMF), Session Management Function (SMF), and User Plane Function (UPF) in 5G, as well as a V2X Application Server (V2AS) and Data Network (DN; e.g., operator-provided services, Internet access, or third-party services). All or part of the core network functions and application services may be deployed and run in a cloud computing environment.

[0045] Therefore, the present disclosure provides an application server (e.g., an AF in a 5G architecture) comprising: a transmitter that, in operation, sends a request including QoS requirements for at least one of a URLLC service, an eMMB service, and an mMTC service to at least one of 5GC functions (e.g., an NEF, an AMF, an SMF, a PCF, an UPF, etc.) to establish a PDU session including a radio bearer between a gNodeB and a UE according to the QoS requirements; and a control circuit that, in operation, performs a service using the established PDU session.

[0046] In the present disclosure, the downlink control signal (information) according to the present disclosure may be a signal (information) transmitted via a PDCCH of a physical layer, or may be a signal (information) transmitted via a MAC Control Element (CE) of a higher layer or an RRC. The downlink control signal may be a predefined signal (information).

[0047] The uplink control signal (information) according to the present disclosure may be a signal (information) transmitted via a PUCCH of a physical layer, or may be a signal (information) transmitted via a MAC CE of a higher layer or RRC. The uplink control signal may also be a predefined signal (information). The uplink control signal may be uplink control information (UCI), first-stage sidelink control information (SCI), or second-stage SCI.

[0048] In the present disclosure, a base station may be, for example, a Transmission Reception Point (TRP), a cluster head, an access point, a Remote Radio Head (RRH), an eNodeB (eNB), a gNodeB (gNB), a Base Station (BS), a Base Transceiver Station (BTS), a base unit, or a gateway. Furthermore, in sidelink communication, a terminal may be used instead of a base station. The base station may be a relay device that relays communication between an upper node and a terminal. The base station may be a roadside unit.

[0049] The present disclosure may be applied to any of the uplink, downlink, and sidelink, for example, uplink channels such as PUSCH, PUCCH, and PRACH, downlink channels such as PDSCH, PDCCH, and PBCH, and sidelink channels such as a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and a physical sidelink broadcast channel (PSBCH).

[0050] The PDCCH, PDSCH, PUSCH, and PUCCH are examples of a downlink control channel, a downlink data channel, an uplink data channel, and an uplink control channel, respectively. The PSCCH and PSSCH are examples of a sidelink control channel and a sidelink data channel, respectively. The PBCH and PSBCH are examples of a broadcast channel, and the PRACH is an example of a random access channel.

[0051] The present disclosure may be applied to both data channels and control channels. The channels in the present disclosure may be replaced with data channels including PDSCH, PUSCH, and PSSCH, and / or control channels including PDCCH, PUCCH, PBCH, PSCCH, and PSBCH.

[0052] In this disclosure, a reference signal is a signal known to both a base station and a mobile station, and each reference signal may be referred to as a reference signal (RS) or a pilot signal. A reference signal may be any of a DMRS, a Channel State Information - Reference Signal (CSI-RS), a Tracking Reference Signal (TRS), a Phase Tracking Reference Signal (PTRS), a Cell-specific Reference Signal (CRS), and a Sounding Reference Signal (SRS).

[0053] An antenna port refers to a logical antenna (antenna group) formed from one or more physical antennas. That is, an antenna port does not necessarily refer to a single physical antenna, but may refer to an array antenna consisting of multiple antennas, etc. For example, the number of physical antennas constituting an antenna port is not defined; instead, an antenna port is defined as the smallest unit through which a terminal is permitted to transmit a reference signal. An antenna port may also be defined as the smallest unit for multiplication of precoding vector weights. While some characteristics of various embodiments are described with reference to devices, it will be understood that corresponding characteristics also apply to the methods of various embodiments, and vice versa.

[0054] New communications apparatus and methods for enhancing uplink transmissions using multiple beams need to be developed to address one or more of the above challenges, particularly to enhance (i) performance of cell-edge UEs or UEs in coverage extension areas, (ii) use cases for these UEs, (iii) beam-directed operation (or beam management) in 5G, and (iv) multiple TRP transmission operation. Other desirable features and characteristics will become apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings and the background of this disclosure.

[0055] In various embodiments below, an uplink transmission occasion refers to a nominal / actual repetition or a group / set of nominal / actual repetitions, where a nominal / actual repetition may be one or more consecutive symbols.

[0056] Figure 6 shows exemplary PUSCH repetition type A 600 and PUSCH repetition type B 602, where the same UL beam is applied for all PUSCH repetitions. As mentioned above, in Rel. 15, separate repetition transmissions 610, 612, 614 occur in separate slots 604, 606, 608 with the same length and the same starting symbol, while in Rel. 16, a nominal PUSCH repetition may be split into multiple actual repetitions 624, 626, 628 based on crossing slot boundaries 616 or invalid symbols (not shown). All PUSCH repetitions are assumed to use the same UL beam (i.e., spatial relationship information) and the same UL transmission parameter settings, in accordance with Observation 1 in the current Rel. 15 / 16 standards.

[0057] One of the main technical challenges of using high frequency bands for 5G New Radio (NR) networks is the severe shadowing caused by people / buildings, which leads to shadow fading and penetration loss. For example, human shadowing can cause significant propagation channel attenuation of 30–40 dB. Because the same UL beam is used for all PUCCH / PUSCH repetitions, the beam can be blocked by human bodies, resulting in significant degradation of coverage and reliability. To overcome shadowing, multiple beams can be used for PUCCH / PUSCH repetitions. However, how to address the latency aspect of beam switching remains an open issue for supporting PUCCH / PUSCH repetitions using multiple beams.

[0058] 7 shows a schematic diagram 700 illustrating one example shading of multiple beams for uplink transmission. A UE (e.g., a mobile device) 702 may initiate an UL transmission to a base station 704. The UL transmission via beam 1 706 is shading by a person's hand 708, causing the UL transmission to fail, while beam 2 710 is not shading by the person's hand 708 and therefore may reach the base station 704. Therefore, beam 2 710 can be used for the UL transmission.

[0059] Therefore, there is a need to develop a new communication apparatus and method for addressing one or more of the above-mentioned problems and enhancing uplink transmission using multiple beams. According to the present disclosure, a UE is configured to use two or more beams to transmit multiple uplink transmission occasions in response to satisfying at least one condition. Such at least one condition relates to at least one of explicit network instruction and required latency of beam switching. Advantageously, this may improve performance in terms of coverage and reliability of uplink transmission using multiple beams.

[0060] 8 illustrates a schematic example of a communications device according to various embodiments. The communications device may be implemented as a UE or a gNB / base station and may be configured to extend uplink transmissions using multiple beams in accordance with various embodiments of the present disclosure.

[0061] As shown in FIG. 8, the communications device 800 may include a circuit 814, at least one wireless transmitter 802, at least one wireless receiver 804, and at least one antenna 812 (for simplicity, only one antenna is shown in FIG. 8 for illustrative purposes). The circuit 814 may include at least one controller 806. The controller 806 is used to perform, with the assistance of software and hardware, tasks that the at least one controller 806 is designed to perform, including controlling communications with one or more other communications devices in a wireless network. The circuit 814 may further include at least one transmit signal generator 808 and at least one receive signal processor 810. The at least one control unit 806 can control, under the control of the at least one control unit 806, at least one transmit signal generating unit 808 for generating a signal (e.g., a baseband signal) to be transmitted to one or more other communication devices (e.g., a base communication device) via the at least one wireless transmitting unit 802, and at least one receive signal processing unit 810 for processing a signal (e.g., a baseband signal) received from one or more other communication devices via the at least one wireless receiving unit 804 under the control of the at least one control unit 806. The at least one transmit signal generating unit 808 and the at least one receive signal processing unit 810 may be standalone modules of the communication device 800 that communicate with the at least one control unit 806 for the above-mentioned functions, as shown in FIG. 8 . Alternatively, the at least one transmit signal generating unit 808 and the at least one receive signal processing unit 810 may be included in the at least one control unit 606. It is apparent to those skilled in the art that the arrangement of these functional modules is flexible and may change according to actual needs and / or requirements. Data processing, virtual memory, and other related controls may be provided on an appropriate circuit board and / or within a chipset. In various embodiments, in operation, the at least one wireless transmitter 602, the at least one wireless receiver 804, and the at least one antenna 812 may be controlled by the at least one controller 806.

[0062] In various embodiments of the present disclosure, the wireless transmitter 802 and the wireless receiver 804 may be collectively referred to as a transceiver. Thus, the communications device 800 may include at least one transceiver for transmitting and receiving signals via at least one antenna 812.

[0063] The communications device 600, in operation, provides functionality necessary for enhanced uplink transmission using multiple beams. For example, the communications device 600 may be a UE, and the at least one radio receiver 804, in operation, may receive control information indicating two or more beams for uplink transmission, and the circuitry 614, in operation, may use the two or more beams for multiple uplink transmission occasions in response to satisfying at least one condition for beam switching based on the control information.

[0064] 9 illustrates a flow diagram 900 illustrating a communication method for enhancing uplink transmission using multiple beams, according to various embodiments of the present disclosure. At step 902, receiving control information indicating two or more beams for uplink transmission is performed. At step 904, using the two or more beams for multiple uplink transmission occasions is performed in response to satisfying at least one condition for beam switching.

[0065] In the following paragraphs, some examples related to the first embodiment of the present disclosure will be described in relation to uplink transmission using multiple beams, particularly to a UE under PUSCH repetition type A using multiple beams.

[0066] 10 illustrates a PUSCH repetition type A in which two beams are used according to a first example of the first embodiment of the present disclosure. Under PUSCH repetition type A, different transmission occasions (e.g., repetitions 1006, 1008) are transmitted in different slots 1002, 1004, respectively, having the same length and the same starting symbol. In this embodiment, the interval (T) between two consecutive transmission occasions (e.g., repetitions 1006, 1008 in consecutive slots 1002, 1004) is set equal to the required latency (T) of beam switching for the UE. BSw ), beam switching between multiple beams is applied. The spacing can be calculated using equation (1), T BSw The above condition for T related to can be expressed using equation (2).

number

number

[0067] where L is the length of each repetition, T is the interval between two consecutive transmission occasions (in this case, 1006, 1008), and T BSw is the required latency of beam switching. If the condition expressed by Equation 2 is satisfied, that is, if iteration #1 1006 and iteration #2 1008 have an interval greater than the required latency of beam switching (T=14-L≧T BSw ), two beams (Beam #1 1010 and Beam #2 1012) are configured to be used to transmit Repetition #1 1006 and Repetition #2 1008, respectively.

[0068] In one embodiment, the beam switching decision is made by the base station gNB. In such an embodiment, a new explicit indication indicates this decision to the UE by using at least one of downlink control information (DCI) signaling, medium access control layer control element (MAC CE) signaling, or radio resource control (RRC) signaling. Instead of using {S,L} or {SLIV} (where S is the start symbol of the PUSCH assignment, L is the length of each repetition, and SLIV is the start length indicator) as specified in the Rel. 15 / 16 standard, the new explicit indication indicates that the time-domain resource assignment (TDRA) is {S,L,14-L≧T BSw} or {SLIV,14-L≧T BSw Additionally or alternatively, the DCI may be used to indicate the TDRA value.

[0069] Beam switching may be applicable within each slot (e.g., slot 1002, slot 1004). In other words, inter-slot level beam switching and mapping may be applicable on a slot-by-slot basis. As shown in FIG. 10, a periodic beam mapping pattern, i.e., a first beam (e.g., beam #1 1010) and a second beam (e.g., beam #2 1012) may be applied to the first repetition (e.g., repetition #1 1006) and the second repetition (e.g., repetition #2 1008) of a slot, respectively. Assuming there are no beams other than the first beam 1010 and the second beam 1012, the first beam and the second beam are applied to the third and fourth repetitions (not shown), respectively. The same beam mapping pattern is subsequently used for the remaining repetitions.

[0070] In a first modification of the first embodiment, a subset of {S, L} or {SLIV} can be set. This subset is defined in Section 5.1.2.1 on time domain resource allocation in Non-Patent Document 8, and satisfies the conditions expressed by equations (1) and (2).

[0071] In a second variation of the first embodiment, a sequential mapping pattern is used instead of the periodic beam mapping pattern.

[0072] For example, a first beam 1010 may be applied to the first and second iterations 1006, 1008, a second beam 1012 may be applied to the third and fourth iterations (not shown), a third beam (not shown) may be applied to the fifth and sixth iterations (not shown), and the same beam mapping pattern may be subsequently used for the remaining iterations.

[0073] In a third variation of the first embodiment, a half-half mapping pattern is used instead of the periodic beam mapping pattern. Specifically, if there are a total of four repetitions in the PUSCH, the first beam 1010 is applied to the first half of the four repetitions, i.e., the first and second repetitions, while the second beam 1012 is applied to the second half of the four repetitions, i.e., the third and fourth repetitions.

[0074] In a fourth variant of the first embodiment, instead of a periodic beam mapping pattern, the use of multiple beams for multiple repetitions, i.e., each of the first beam 1010 and the second beam 1012, is configurable. This beam mapping pattern is also referred to as a configurable beam mapping pattern.

[0075] In a fifth modification of the first embodiment, the interval between two consecutive repetitions is determined based on the length of each repetition.

[0076] In a sixth variant of the first embodiment, if the interval between two consecutive repetitions is less than the required latency of beam switching and therefore the condition is not met, only one of the multiple beams will be used to transmit the multiple repetitions.

[0077] In a seventh variant of the first embodiment, if the interval between two consecutive repetitions is less than the required latency of beam switching, and therefore the condition is not met and the first beam is the strongest beam among the multiple beams, other repetitions mapped to beams other than the first beam are dropped so that only the repetitions mapped to the first beam are transmitted.

[0078] In an eighth variant of the first embodiment, in the case of PUSCH repetitions in non-consecutive slots, for example, the first slot 1002 and a third slot (not shown) adjacent to the second slot 1004, if the interval between two consecutive repetitions is less than the required latency for beam switching and therefore the condition is not met and the first beam is the strongest beam among the multiple beams, the repetitions mapped to beams other than the first beam are postponed or moved until the condition is met, i.e., until the interval between two consecutive repetitions is greater than or equal to the required latency for beam switching.

[0079] In a ninth variant of the first embodiment, with reference to the seventh and eighth variants, the first beam may be the set beam having the smallest index.

[0080] In a tenth modification of the first embodiment, the interval between two consecutive repetitions varies for each UE.

[0081] In an eleventh variation of the first embodiment, a slot may be a virtual slot that includes several consecutive virtual symbols in a symbol-level repetition framework. The virtual symbol includes multiple consecutive symbols. Furthermore, sequential mapping patterns and half-half mapping patterns may be used in mapping the repetition of the virtual symbols across the virtual slot.

[0082] In a twelfth variant, the repetition length of the PUSCH allocation can be shorter for multiple beams.

[0083] It should be noted that the uplink transmission occasions using multiple beams mentioned above can be directly single and multiple in a single-TRP (Transmission Reception Point) or multi-TRP transmission scenario. In the single-TRP case, the first beam 1010 and the second beam 1012 are used for the first repetition 1006 and the second repetition 1008, respectively, while in the multi-TRP case, both the first beam 1010 and the second beam 1012 are used to map both the first repetition 1006 and the second repetition 1008. Figure 11 shows a schematic diagram illustrating two beams mapped to two repetitions of Figure 10 under a multiple-TRP (Transmission Reception Point) transmission scenario according to a first example of the first embodiment of the present disclosure. A UE 1101 may transmit signals to a first base station 1102 and a second base station 1104 via a first beam (e.g., beam #1 1010) and a second beam (e.g., beam #2 1012), respectively. In the schematic diagram 1100 of Figure 11, beam #1 and beam #2 that are the same as beam #1 and beam #2 in Figure 10 are given the same reference numerals in the drawing, and their description will be omitted.

[0084] Under a multi-TRP transmission scenario, the UE may be configured to use beam #1 1010 and beam #2 1012 for all iterations (e.g., first iteration 1006 and second iteration 1008). In this scenario, even if beam #1 1010 is blocked by a hand 1106 and cannot reach the intended first base station 1102, iterations 1006, 1008 may be transmitted to the second base station 1104 via beam #2 1012.

[0085] 12 illustrates an example configuration 1200 of time-domain resource allocation for beam switching for multiple uplink transmission occasions according to the first embodiment of the present disclosure. PUSCH-Allocation-r16 in PUSCH-TimeDomainResourceAllocation is extended to indicate beam switching by adding a new item, beam-switching. When beam-switching is enabled and the value indicated by numberOfRepetition0r16 is greater than 1, the UE may be further configured to enable one of the beam mapping patterns in beam-mapping-pattern. Here, CycBeamMap, SeqBeamMap, HalfBeamMap, and ConfigBeamMap indicate a periodic beam mapping pattern, a sequential beam mapping pattern, a half-half beam mapping pattern, and a configurable beam mapping pattern, respectively.

[0086] According to a second example of the first embodiment of the present disclosure, a new explicit indication to enable beam switching may be used to instruct the UE. In such a case, unlike the first example, if the interval between two consecutive repetitions (e.g., the interval represented by Equations (1) and (2)) is equal to or greater than the required latency for beam switching, the beam switching decision is made by the UE. If it is less than the required latency, beam mapping and switching cannot be applied. The new explicit indication is indicated using at least one of DCI signaling, MAC / CE signaling, and RRC signaling. When the new explicit indication is configured by the gNB, the UE understands that the gNB supports beam mapping based on the current TDRA for PUSCH allocation repetitions used based on {S, L} or {SLIV} specified in the Rel. 15 / 16 technical specifications.

[0087] As in the first example, any one of beam mapping patterns such as a periodic beam mapping pattern, a sequential beam mapping pattern, a half-half beam mapping pattern, and a configurable beam mapping pattern may be used in the second example.

[0088] To perform the operation of the second example of the first embodiment, when the UE first receives control information and a new explicit instruction to enable beam switching from the gNB, the UE may determine the starting symbol S and allocation length L for the repetition of PUSCH allocation from the current TDRA setting and the new explicit instruction to enable beam switching, and then calculate the required latency T for beam switching based on the UE's performance. BSwIn response to the instruction, the UE determines whether to perform actual beam switching if the conditions expressed in equations (1) and (2) are satisfied. The UE understands that the gNB supports beam mapping based on the new instruction. The UE may be further configured to provide assistance information to the gNB based on the UE's capabilities, where the assistance information includes at least a beam mapping pattern, required beam switching latency preferences, processing timeline parameters, antenna configurations, bandwidth fractions, channel state information measurements, and / or spatial information. Such assistance information is provided for use in subsequent configuration for UE adaptation to effectively perform uplink transmission.

[0089] In particular, the difference between the first example and the second example of the first embodiment of the present disclosure is that in the first example, the beam switching decision is made by the gNB, and in the second example, the beam switching decision is made by the UE. Beam switching is applicable within each slot in the first example, but may not be applicable in the second example due to the derivation of TDRA including S and L for PUSCH repetition. TDRA is defined based on {S, L, 14 - L ≥ T_BSw} or {SLIV, 14 - L ≥ T_BSw} in the first example, and based on {S, L} or {SLIV} in the second example.

[0090] In the following paragraphs, some examples related to the second embodiment of the present disclosure are described in relation to a UE for uplink transmission using multiple beams, particularly under PUSCH repetition type B using multiple beams.

[0091] Under PUSCH repetition type B, the nominal repetition of the PUSCH can be divided into multiple actual repetitions based on crossing slot boundaries or invalid symbols. According to a second embodiment, to enable beam switching between multiple beams for PUSCH repetition type B, T BSw is taken into account and new invalid symbols are defined by the UE.

[0092] In a first example of the second embodiment, the new invalid symbol is set according to the following equation (3).

number

[0093] Here, Rel.16_invalid_symbols are Rel.16 invalid symbols indicated using tdd-UL-DL-ConfigurationCommon / tdd-UL-DLConfigurationDedicated, ssb-PositionsInBurst / ssb-PositionsInBurst, numberInvalidSymbolsForDL-UL-Switching, or InvalidSymbolPattern, etc.

[0094] According to Section 6.1.2.1 of version 16.2.0 of Non-Patent Document 8, when multiple serving cells are configured for a UE, half-duplex-behavior-r16 is "enable", the UE is not capable of simultaneous transmission and reception in any of the multiple serving cells, and the UE is in an unpaired spectrum. If the UE indicates support for the capability of half-duplex operation with CA over the UL-10000 spectrum and is not configured to monitor the PDCCH for detection of DCI format 2_0 in any of the multiple serving cells, the symbol is considered an invalid symbol in any of the multiple serving cells for PUSCH repetition Type B transmissions if indicated to the UE for reception of SS / PBCH blocks in any of the multiple serving cells by ssb-PositionsInBurst in SIB1 or ssb-PositionInBurst in ServingCellConfigCommon, the symbol is considered an invalid symbol in any of the multiple serving cells for PUSCH repetition Type B transmissions with Type 1 or Type 2 configured grants except for the first Type 2 PUSCH transmission (including all repetitions) after activation if indicated for downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated in the reference cell, or the UE is configured by higher layers to receive PDCCH, PDSCH, or CSI-RS in the reference cell at the symbol.

[0095] For PUSCH repetition type B, after determining the invalid symbols for PUSCH repetition type B transmission for each of the K nominal repetitions, the remaining symbols are considered as potentially valid symbols for PUSCH repetition type B transmission. If the number of potentially valid symbols for PUSCH repetition type B transmission is greater than zero for a nominal repetition, the nominal repetition consists of one or more actual repetitions, where each actual repetition consists of a contiguous set of all potentially valid symbols that may be used for PUSCH repetition type B transmission in a slot. Except for the L-1 case, actual repetitions by one symbol are omitted. Actual repetitions are omitted according to the conditions in Section 11.1 of Non-Patent Document 9. The redundancy version applied to the nth actual repetition (the count includes omitted actual repetitions) is determined according to Table 2.

[0096] For PUSCH repetition type B, when a UE receives a DCI that schedules aperiodic CSI reporting or activates semi-persistent CSI reporting on a PUSCH without a transport block via the CSI request field in the DCI, the number of nominal repetitions is always assumed to be 1, regardless of the value of numberofrepetitions. When a UE is scheduled to transmit PUSCH repetition type B with aperiodic or semi-persistent SCI reporting without a transport block via the SCI request field in the DCI, the first nominal repetition is expected to be identical to the first actual repetition. For PUSCH repetition type B that includes semi-persistent SCI reporting on a PUSCH without a corresponding PDCCH after being activated via the CSI request field in the DCI, if the first nominal repetition is not identical to the first actual repetition, the first nominal repetition is omitted; otherwise, the first nominal repetition is omitted according to the conditions in Section 11.1 of 3GPP TS 36.210.

[0097] For PUSCH repetition type B, if a UE is scheduled to transmit a transport block and an aperiodic CSI report on the PUSCH by the CSI request field in the DCI, the CSI report is multiplexed only in the first actual repetition. The UE does not expect the first actual repetition to have a single symbol duration.

[0098] If pusch-TimeDomainAllocationList in pusch-Config contains rows indicating resource allocations for 2 to 8 consecutive PUSCHs, K2 indicates the slot in which the UE transmits the first of multiple PUSCHs, each with a distinct SLIV and mapping type. The number of scheduled PUSCHs is signaled by the number of indicated valid SLIVs in the row of pusch-TimeDomainAllocationList signaled in DCI format 0_1.

[0099] If minimumSchedulingOffsetK2 in the active UL Bandwidth Part (BWP) is configured for the UE, it shall apply the minimum scheduling offset restriction indicated by the "Minimum applicable scheduling offset indicator" field in DCI format 0_1 ​​or DCI format 1_1, if the same field is available. If minimumSchedulingOffSetK2 in the active UL BWP is configured for the UE and the "Minimum applicable scheduling offset indicator" field is not received in DCI format 0_1 ​​or 1_1, the UE shall apply the indicated minimum scheduling offset restriction based on the "Minimum applicable scheduling offset indicator" value "0". If the minimum scheduling offset restriction applies, the UE will not have a DCI scheduled in slot n and will have a K 2min′ 2 μ′ / 2 μ It is expected that a PUSCH scheduled with a C-RNTI, CS-RNTI, MCS-C-RNTI, or SP-CSI-RNTI with a smaller K2 is transmitted, where K 2min where μ and μ are the applied minimum scheduling offset limit and the numerology of the active UL BWP of the scheduled cell when receiving DCI in slot n, respectively, and μ′ is the numerology of the new active UL BWP in the case of changing the active UL BWP in the scheduled cell, and is equal to μ otherwise. The minimum scheduling limit does not apply when PUSCH transmission is scheduled by a RAR UL grant or a fallback RAR UL grant for a RACH procedure, or when PUSCH is scheduled by TC-RNTI. The application delay of a change in the minimum scheduling offset limit is determined in Section 5.3.1.

[0100] In a first example of the second embodiment, such new invalid symbols according to Equation (3) are applied to any occasion or event of Rel. 16 invalid symbols. In particular, one occasion or event may include a single or multiple consecutive Rel. 16 invalid symbols. Such new_invalid_symbols may be indicated to the UE by using at least DCI signaling, MAC CE signaling, and RRC signaling.

[0101] 13 illustrates an example configuration of new invalid symbols in uplink transmission occasions under PUSCH repetition type B according to the second embodiment of the present disclosure. NewInvalidSymbolPattern and T_BSw are further proposed, value1 and value2 correspond to durations of 3 and 6 symbols, and InvalidSymbolPattern-r16 is specified in Rel.16.

[0102] After applying the new invalid symbols to all occasions or events of the Rel. 16 invalid symbols in PUSCH recurrence type B, the nominal / actual recurrence of PUSCH recurrence type B is based on the new invalid symbols. The nominal recurrence of PUSCH is divided into multiple actual recurrences based on the new invalid symbols. Each of multiple beams may be used for a group of actual recurrences. Beam switching between multiple beams is applied during the time occupied by the new invalid symbols. Similarly, in this embodiment, any one of beam mapping patterns such as a periodic beam mapping pattern, a sequential beam mapping pattern, a half-half beam mapping pattern, and a configurable beam mapping pattern may be used.

[0103] Figure 14A shows PUSCH repetition type B 1400a with Rel. 16 invalid symbols. In Figure 14A, the UE determines six actual repetitions #1-6 from three nominal repetitions #1-3 based on the Rel. 16 (legacy) invalid symbols (e.g., symbols #4-5 and #11 in the UL slot).

[0104] In this example, the new invalid symbol is determined based on a single symbol (e.g., the Rel. 16 invalid symbol in symbol #11 of FIG. 14A) or multiple consecutive legacy invalid symbols (e.g., the Rel. 16 (legacy) invalid symbols in symbols #4-5 of FIG. 14A). FIG. 14B illustrates a PUSCH repetition type B with a new invalid symbol 1400b according to an example of the second embodiment of the present disclosure. BSw Assume that it is determined that Rel. 16 has a value of three symbols, then in the UL slot, three new invalid symbols at symbols #4-6 and symbols #11-13 are determined for the first occasion / event (based on consecutive Rel. 16 invalid symbols at symbols #4-5) and the second occasion / event (based on a single Rel. 16 invalid symbol at symbol #11).

[0105] Using the new invalid symbol, the UE determines five actual repetitions #1-5 from the three nominal repetitions #1-3. The introduction of such a new invalid symbol creates an interval between two actual repetitions that is equal to or greater than the required latency of beam switching, thus enabling beam switching. Beam switching between multiple beams can be applied during the time occupied by the new invalid symbol, in this case at symbols #4-6, with the first beam #1 1402 being used for the set of actual repetitions #1-3 and the second beam #2 1404 being used for the set of actual repetitions #4-5.

[0106] According to the second example of the second embodiment, the new invalid symbol is set according to the following equation (4).

number

[0107] In the formula, Rel.16_invalid_symbols is the Rel.16 invalid symbol indicated using tdd-UL-DL-ConfigurationCommon / tdd-UL-DLConfigurationDedicated, ssb-PositionsInBurst / ssb-PositionsInBurst, numberInvalidSymbolsForDL-UL-Switching, or InvalidSymbolPattern, etc., as specified in Section 6.1.2.1 of the technical standard, Non-Patent Document 8.

[0108] Figure 15A shows PUSCH repetition type B 1500a with Rel. 16 invalid symbols. In Figure 15A, the UE determines six actual repetitions #1-6 from three nominal repetitions #1-3 based on the Rel. 16 (legacy) invalid symbols, e.g., symbols #4-5 and #11 in the UL slot.

[0109] In this second embodiment, new invalid symbols are determined and T for beam switching is performed. BSw In other words, the settings of T BSw is the time domain resource allocation for beam switching. In one case, Rel. 16 invalid symbols and T BSw where the Rel. 16 (legacy) invalid symbols are T BSw (i.e., non-overlapped case). Here, as shown in Figure 15C, T BSw Beam switching is set to be applicable only during the period specified in 1508.

[0110] In other cases in this second example, Rel. 16 (legacy) invalid symbols and T BSwA new invalid symbol can be determined by integrating the Rel. 16 invalid symbols, T BSw (i.e., overlapped case). Furthermore, unlike the first example, the determination of new invalid symbols in both the non-overlapping and overlapping cases may not apply to all occasions / events of single or multiple consecutive Rel. 16 invalid symbols. In the overlapping case, the Rel. 16 (legacy) invalid symbol and the T BSw The length of the integration of BSw is at least as long as

[0111] Therefore, beam switching is performed by T BSw (For example, in FIG. 15B, in the UL slot, Rel. 16 (legacy) invalid symbols and T BSw The integrated symbols are symbols #2 to #5, and T BSw contains three symbols, and beam switching is configured only between symbols #2 to #4 in the UL slot (hereafter referred to as case i), or Rel. 16 (legacy) invalid symbols and T BSw It is set so as to be applicable to either the case ii) or the case iii) which is flexibly set during the duration of integration of the above.

[0112] In particular, Figure 15B illustrates a PUSCH repetition type B 1500b with new invalid symbols according to another example of the second embodiment of the present disclosure. BSw 1506 is independently determined and includes three symbols such as symbols #2 to #4 in the uplink slot, and symbol #4 overlaps with the symbol of the Rel.16 (legacy) invalid symbol. BSwThe new invalid symbols, which are the aggregated symbols with the Rel. 16 invalid symbols, are symbols #2-5, including the Rel. 16 invalid symbols in symbols #4-5 of the uplink slot. The UE further determines five actual repetitions #1-5 from three nominal repetitions #1-3 based on the new invalid symbols as in equation (4). For case i, beam switching is configured to be applied between symbols #2-4 in the UL slot. For case ii, beam switching may be configured between symbols #2-4 in the UL slot, and another possibility is that beam switching is flexibly configured between symbols #3-5 in the UL slot, i.e., flexibly configurable within the aggregated symbols. For example, the first beam #1 1502 is used for the actual repetition group #1-2, and the second beam #2 1504 is used for the actual repetition group #3-5. In other embodiments, independently configured T BSw may not overlap with the Rel. 16 invalid symbols, as shown in Figure 15C. BSw 1508 is independently determined and includes three symbols, such as symbols #1-3, in the uplink slot, but does not overlap with the Rel. 16 (legacy) invalid symbols in symbols #4-5. Beam switching is configured to be applied between symbols #1-3 of the UL slot. It should be understood that the time resource allocation for actual repetition in the non-overlapping case differs from the resource allocation in the overlapping case, and within the overlapping case, the time resource allocation for actual repetition is similar for both cases i and ii.

[0113] In the following paragraphs, some examples regarding the third embodiment of the present disclosure will be described with reference to a UE for uplink transmission using multiple beams with symbol-level repetition.

[0114] Symbol-level repetition includes the concepts of virtual symbols and virtual slots. A virtual symbol includes multiple consecutive symbols corresponding to the virtual symbol length, while a virtual slot consists of multiple consecutive virtual symbols. This is because it assumes the use of a combination of symbol-level repetition and slot-level repetition (repetition type A specified in Rel. 15, where separate repeated transmissions are performed in separate (virtual) slots with the same length and the same starting symbol), i.e., virtual slot-level repetition. In particular, a virtual symbol (repetition) is repeated across multiple virtual slots. Therefore, the Rel. 15 repetition procedure can be reused by replacing symbol / slot with virtual symbol / virtual slot.

[0115] Beam switching between multiple beams is performed when the interval (e.g., duration) between two consecutive repetitions of a virtual symbol is T BSw This applies to cases where the above is true. This is sometimes called inter-virtual slot level beam switching / mapping. Such beam switching in this embodiment is similar to that in the first embodiment, but involves symbol-level repetition (virtual symbols and virtual slots). Therefore, all modifications of the first embodiment of the present disclosure can be used in this third embodiment and its modifications by replacing virtual symbols / virtual slots with symbols / slots, and a description of various modifications of this embodiment will be omitted. For example, one of beam mapping patterns, such as a periodic beam mapping pattern, a sequential beam mapping pattern, a half-half beam mapping pattern, and a configurable beam mapping pattern, can be used to perform beam mapping for virtual symbol repetition across multiple virtual slots.

[0116] 16 illustrates an exemplary symbol-level repetition according to the third embodiment of the present disclosure. Six virtual symbols 1506a are mapped to virtual slot n+1 1502, where each virtual symbol 1506a includes two consecutive symbols (virtual symbolLength=2). A repetition 1506b of these virtual symbols is mapped to virtual slot n+2 1504. Two consecutive repetitions of virtual symbols 1506a, 1506b are mapped to T BSw If the spacing (e.g., duration) is equal to or greater than T, beam switching between multiple beams becomes possible. BSw In this case, beam #1 1608 and beam #2 1610 are used for the first repetition 1506a and second repetition 1506b of the virtual symbol, respectively.

[0117] To perform the operation of the third embodiment, the UE is provided with the number of symbols per virtual symbol (virtualsymbolLength), the number of virtual symbols per virtual slot, and / or the number of virtual slot repetitions by using at least one of DCI signaling, MAC CE signaling, or RRC signaling, as well as beam mapping and beam switching information.

[0118] 17 illustrates an exemplary PUSCH allocation configuration for beam switching for multiple uplink transmission occasions according to a third embodiment of the present disclosure. Similar to the first embodiment, PUSCH-Allocation-r16 is extended to indicate symbol-level repetition by adding a new item, symbol_level, to indicate the time-domain resource allocation (TDRA) of virtual symbols for PUSCH allocation and beam switching. When symbol_level is configured and numberOfRepetitions-r16>1, the UE may be further configured to enable one of the beam mapping patterns in beam-mapping-pattern.

[0119] In a variation of the third embodiment of the present disclosure, a frequency hopping procedure is used based on at least virtual symbols / virtual slots. Demodulation reference signals for frequency hopping can be enabled based on the virtual symbols / virtual slots. In particular, each repetition of a virtual symbol can correspond to a frequency hop. Therefore, if the interval (e.g., duration) between two consecutive frequency hops is T BSw If so, beam switching between multiple beams is applied. All variants of the first embodiment may still be applied to this variant of the third embodiment of the present disclosure. For example, beam mapping for frequency hopping may be performed using one of beam mapping patterns, such as a periodic beam mapping pattern, a sequential beam mapping pattern, a half-half beam mapping pattern, and a configurable beam mapping pattern. To perform such an operation, the inter-slot frequency hopping procedure of Rel. 15 / 16 can be reused by replacing inter-slot with virtual inter-slot. Advantageously, this variant may help to realize frequency hopping gains.

[0120] While the above example describes symbol-level repetition using the concept of repetition type A (with inter-virtual slot level beam switching / mapping), in another consideration of the third embodiment, a combination of symbol-level repetition and the concept of repetition type B may be used. In such a variation, beam switching between multiple beams may be applied as in the second embodiment, where new null symbols may be introduced with symbol-level repetition (virtual symbols) across virtual slots.

[0121] In the following paragraphs, some examples related to the fourth embodiment of the present disclosure are described with reference to a UE for uplink transmission with transport block (TB) processing across multiple slots and multiple beams.

[0122] In the case of TB processing across multiple slots, the TB size is obtained for a single slot, but is mapped and transmitted in multiple portions across multiple slots. Beam switching between multiple beams is performed when the interval (e.g., duration) between two consecutive portions mapped (across two consecutive or non-consecutive slots) is T BSw This applies to the above cases. All variants of the first embodiment of the present disclosure can be used in this fourth embodiment and its variants by replacing the mapped portions with repetitions or uplink transmission occasions. Advantageously, this can realize coding and time diversity gains.

[0123] In a first variant of the fourth embodiment, joint repletion and TB processing across multiple slots is applied. The TB size is obtained for a single slot (or virtual slot) or multiple slots (or multiple virtual slots). The TB (TB across a single slot of multiple slots) is repeated for multiple transmissions in the time domain, with each repetition corresponding to a transmission occasion of the TB. Beam switching between multiple beams is performed when the interval (e.g., duration) between two consecutive repetitions is T BSw This applies when the above conditions are met.

[0124] In a second variant of the fourth embodiment, a frequency hopping procedure is applied to each of the multiple portions (across multiple slots). The beam switching between multiple beams is performed such that the interval (e.g., duration) between two consecutive frequency hops is T BSw This applies when the above conditions are met.

[0125] In a third variant of the fourth embodiment, a TB may be partially mapped and transmitted across multiple virtual slots.

[0126] In the following paragraphs, some example embodiments of the present disclosure are described with reference to UEs supporting other considerations for enhancing uplink transmission using multiple beams.

[0127] In various embodiments, the required latency of beam switching, T BSw is expressed in symbols. In one embodiment, T BSw If is very small or negligible, then at least intra-slot (or virtual intra-slot) level beam switching can be applied. In this embodiment, each beam of the multiple beams is used for one of the nominal / actual repetitions.

[0128] For example, for low subcarrier spacing (SCS), e.g., 15 kHz, 30 kHz, etc., the required latency of beam switching, T BSwis less than or equal to the duration of the cyclic prefix of the OFDM symbol, and the UE can perform beam switching within this cyclic prefix. It is sufficient to apply both intra-slot (or intra-virtual slot) level beam switching and inter-slot (or inter-virtual slot) level beam switching. In another example, if the guard duration between two consecutive slots for inter-slot (or inter-virtual slot) level beam switching is greater than or equal to the required latency of beam switching, the UE can switch beams within this guard duration. For high SCSs for NR operation in millimeter wave (mmWave), e.g., 480 kHz and 960 kHz SCSs for NR operation from 52.6 GHz to 71 GHz or higher, the duration of the OFDM symbol is short, so the required latency of beam switching is greater than or equal to the duration of the OFDM symbol. This makes it sufficient to apply inter-slot (or inter-virtual slot) level beam switching rather than intra-slot (or intra-virtual slot) level beam switching. Note that intra-slot (or virtual intra-slot) level beam switching is applicable as well, provided the required latency of the beam switching is met.

[0129] Also, in one embodiment, each of the multiple beams for beam switching is configured using a set of power control parameters.

[0130] In a codebook-based transmission, to enable PUSCH repetition using multiple beams, in one embodiment, multiple PUSCH transmit precoders from the codebook are indicated by using multiple indications, such as a current Transmit Precoding Matrix Indicator (TPMI) and a new Sounding reference signal Resource Indicator (SRI), in DCI signaling. Each of the multiple beams is associated with one of the TPMIs from the codebook for codebook-based transmission based on control information received from the gNB. Each of the multiple beams may be associated with one of the SRS resource sets for codebook-based transmission, which is associated with channel state information reference signal (CSI-RS) resources. One of the SRS resource sets may be indicated using a new SRI in DCI signaling. In another embodiment, the current TPMI or SRI in the DCI signaling can be reinterpreted to indicate multiple PUSCH transmit precoders or SRS resource sets, respectively, to allow for PUSCH repetition with multiple beams.

[0131] In the case of non-codebook-based transmission, to enable PUSCH repetition with multiple beams, in one embodiment, for each TRP, one sounding reference signal (SRS) resource set is associated with multiple non-zero-power channel state information reference signals (NZP SCI-RS). The SRS resource set is configured by a higher layer parameter such as srs-ResourceSetToAddModList and is associated with the use of a higher layer parameter with the value "nonCodeBook". In one other embodiment, for each TRP, multiple SRS resource sets may be configured, each associated with one NZP CSI-RS and with the use of a higher layer parameter with the value "nonCodeBook".

[0132] In one embodiment, multiple Transmission Configuration Indicator (TCI) states can be indicated in DCI signaling to switch between multiple spatial information, replacing the multiple beams used for PUSCH transmission occasions in the above-described first to fourth embodiments of the present disclosure. When a unified TCI state is indicated for both UL and DL, the unified TCI state is used for both DL and UL repetitions.

[0133] In one embodiment, the above-described first to fourth embodiments of the present disclosure can be applied to a PUCCH repetition framework. Each embodiment can also be used for PUCCH / PUSCH repetition in non-consecutive slots. Each embodiment can also be directly applied to support more than two beams and / or more than two TRPs.

[0134] In yet another embodiment, multiple embodiments described above may be applied simultaneously in a single UE to extend uplink transmission using multiple beams.

[0135] This disclosure provides the following examples.

[0136] 1. A transceiver unit that, in operation, receives control information indicating two or more beams for uplink transmission; and a circuit that, in operation, uses two or more beams for a plurality of uplink transmission occasions in response to satisfying at least one condition for beam switching based on the control information. Communication equipment.

[0137] 2. The communications apparatus of example 1, wherein each of the plurality of uplink transmission occasions is a Physical Uplink Control Channel (PUCCH), a Physical Uplink Shared Channel (PUSCH) processing from one or more transport blocks, a Sounding Reference Signal (SRS), or a Physical Random Access Channel (PRACH) transmission occasion and is defined by a slot index, a starting symbol, and a plurality of consecutive symbols.

[0138] 3. The communications device of Example 1, wherein each of the plurality of uplink transmission occasions is a transmission occasion among a plurality of repetitions of a PUCCH or a PUSCH in an inter-slot level repetition framework, or a transmission occasion among a plurality of nominal / actual repetitions of a PUCCH or a PUSCH in an intra-slot level repetition framework.

[0139] 4. The communications device of Example 1, wherein at least one condition is receiving an explicit notification from a base communications device to perform beam switching in the time domain based on the control information.

[0140] 5. The communications device of Example 1, wherein the transceiver receives control information by using at least one of downlink control information (DCI) signaling, medium access control layer control element (MAC CE) signaling, or radio resource control (RRC) signaling.

[0141] 6. The communications device of example 1, wherein the at least one condition is that a first interval between two consecutive uplink transmission occasions of the plurality of uplink transmission occasions is greater than or equal to a required latency of beam switching.

[0142] 7. The communications device of Example 1, wherein the circuitry is further configured to provide assistance information to the base communications device regarding the configuration of two or more beams for a plurality of uplink transmission occasions.

[0143] 8. The communications device of Example 7, wherein the assistance information includes at least beam switching required latency preferences, processing timeline parameters, antenna configurations, bandwidth fractions, CSI measurements, and / or spatial information based on the communications device's capabilities.

[0144] 9. The communications device of Example 6, wherein the circuitry is further configured to determine a first interval between two consecutive uplink transmission occasions based on a respective length of the two consecutive uplink transmission occasions.

[0145] 10. The communications device of Example 1, wherein the circuitry is configured to use each of the two or more beams in a periodic or sequential pattern for a plurality of uplink transmission occasions in response to satisfying at least one condition.

[0146] 11. The communications device of Example 1, wherein the circuitry is configured to use a first half of the two or more beams for a first half of the plurality of uplink transmission occasions and a second half of the two or more beams for a second half of the plurality of uplink transmission occasions in response to satisfying at least one condition.

[0147] 12. The communications device of example 1, wherein the circuitry is configured to use one of two or more beams for a plurality of uplink transmission occasions in response to failure of at least one condition.

[0148] 13. The communications device of any one of Examples 1-3, wherein the circuitry is further configured to use a first beam of two or more beams for one or more uplink transmission occasions of the plurality of uplink transmission occasions, and to eliminate remaining uplink transmission occasions of the plurality of uplink transmission occasions in response to at least one condition not being satisfied, the first beam being the strongest beam of the two or more beams.

[0149] 14. The communications device of example 13, wherein the circuitry is configured to postpone or move remaining uplink transmission occasions if at least one condition is not satisfied.

[0150] 15. The communications device of example 1, wherein the use of each of two or more beams for multiple uplink transmission occasions is configurable.

[0151] 16. The circuit is determining a new invalid symbol having a length corresponding to a longer one of the length of the required latency of beam switching and the length of the single or multiple consecutive legacy invalid symbols based on the single or multiple consecutive legacy invalid symbols and the required latency of beam switching; determining a plurality of uplink transmission occasions based on the new invalid symbols; configured to use two or more beams for a plurality of uplink transmission occasions in response to the determination; A communication device according to any one of Examples 1 to 3.

[0152] 17. The communications device of example 16, wherein determining multiple uplink transmission occasions based on the new invalid symbol applies to all single or multiple consecutive legacy invalid symbols.

[0153] 18. The circuit is determining a new invalid symbol consisting of one or more consecutive legacy invalid symbols and a required beam switching latency, wherein the single or multiple consecutive legacy invalid symbols do not overlap the required beam switching latency; determining a plurality of uplink transmission occasions based on the new invalid symbols; configured to use two or more beams for multiple uplink transmission occasions in response to a determination; A communication device according to any one of Examples 1 to 3.

[0154] 19. The circuit determining a new null symbol that combines a single or multiple consecutive legacy null symbols and a required latency for beam switching; determining a plurality of uplink transmission occasions based on the new invalid symbols; and using two or more beams for multiple uplink transmission occasions in response to the determination. A communication device according to any one of Examples 1 to 3.

[0155] 20. The communications device of example 19, wherein the circuitry is flexibly configured to perform beam switching within integration of a single or multiple consecutive legacy invalid symbols and required latency of beam switching.

[0156] 21. The communications device of example 1, wherein the circuitry is configured to use each of two or more beams for a subset of a plurality of uplink transmission occasions if at least one condition is met.

[0157] 22. The communication device of any one of Examples 16 to 20, wherein the latency required for beam switching is set to be periodic or aperiodic by control information.

[0158] 23. The communications device of Example 1, wherein each of a plurality of uplink transmission occasions corresponds to one of a plurality of part processing from one or more transport blocks, and each of the plurality of part processing from the one or more transport blocks is mapped to one of a corresponding plurality of slots.

[0159] 24. The communications device of Example 1, wherein the one or more transport blocks are further configured by the control information to be repeated multiple times in the time domain, each of the multiple uplink transmission occasions corresponding to a transmission occasion of the one or more transport blocks, and wherein at least one condition is that a second interval between two consecutive repetitions of the one or more transport blocks is greater than or equal to a required latency of beam switching.

[0160] 25. The communications device of any one of Examples 1-3, wherein each of the multiple uplink transmission occasions corresponds to one of multiple repetitions of a virtual symbol across multiple virtual slots, the virtual symbol including a number of consecutive symbols, and the virtual slot including multiple consecutive virtual symbols at the symbol level repetition.

[0161] 26. The communications device of Example 1, wherein each of the plurality of uplink transmission occasions corresponds to one of a plurality of frequency hops, and wherein at least one condition is that a third interval between two consecutive frequency hops is greater than or equal to a required latency of beam switching.

[0162] 27. The communications device of Example 1, wherein each of the two or more beams is configured with a set of power control parameters.

[0163] 28. The communications device of Example 1, wherein the circuitry is further configured to associate, based on the control information, each of the two or more beams with at least one of a plurality of transmit precoders from a codebook for codebook-based transmission.

[0164] 29. The communications device of example 28, wherein one of the plurality of transmit precoders is indicated in the DCI signaling by using at least a transmit precoding matrix indicator (TPMI) and / or a sounding reference signal resource indicator (SRI).

[0165] 30. The communications device of example 28, wherein the multiple transmit precoders are indicated by reinterpreting at least the TPMI and / or the SRI in the DCI signaling.

[0166] 31. The communications device of example 1, wherein the circuitry is configured to associate each of the two or more beams with at least one of a sounding reference signal (SRS) resource set for codebook-based transmission, and at least one of the SRS resource sets is associated with a channel state information reference signal (CSI-RS) resource.

[0167] 32. The communications device of example 31, wherein one of the SRS resource sets is indicated by using at least an SRI in the DCI signaling.

[0168] 33. The communications device of example 31, wherein the SRS resource set is indicated by reinterpreting at least the SRI in the DCI signaling.

[0169] 34. The communications device of example 1, wherein the circuitry is configured to associate each of the two or more beams with one of a plurality of transmit configuration indicator (TCI) states.

[0170] 35. The communications device of any one of Examples 6, 8, 16-20, 22, 24, and 26, wherein the required latency of beam switching is expressed in symbols.

[0171] 36. The communications device of example 35, wherein the circuitry is configured to apply intra-slot level or virtual intra-slot level beam switching when the required latency of the beam switching is very small or negligible, and one of the two or more beams is used for one of the multiple uplink transmission occasions.

[0172] 37. The communications device of any one of Examples 1-36, wherein the circuitry is configured to use two or more beams for multiple uplink transmission occasions for a single or multiple transmission / reception points (TRPs), each of the two or more beams corresponding to one of the multiple TRPs.

[0173] 38. A circuit that, in operation, generates control information indicating explicit beam switching instructions and / or required latency for two or more beams for uplink transmission; a transmitter that, in operation, transmits control information to the communication device; Base communication equipment.

[0174] 39. Receive control information indicating two or more beams for uplink transmission; using two or more beams for a plurality of uplink transmission occasions in response to satisfying at least one condition for beam switching based on the control information; Communication method.

[0175] The present disclosure can be realized by software, hardware, or software in conjunction with hardware. Each functional block described in the above embodiments may be partially or entirely realized as an LSI, which is an integrated circuit. Each process described in the above embodiments may be partially or entirely controlled by a single LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of a single chip that includes some or all of the functional blocks. The LSI may have data inputs and outputs. Depending on the level of integration, the LSI may be referred to as an IC, system LSI, super LSI, or ultra LSI. The integration method is not limited to LSIs; it may also be realized by dedicated circuits, general-purpose processors, or dedicated processors. Furthermore, FPGAs (Field Programmable Gate Arrays), which can be programmed after LSI fabrication, or reconfigurable processors, which allow the connections and settings of circuit cells within the LSI to be reconfigured, may also be used. The present disclosure may be realized as digital or analog processing. Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology or other derivative technologies, it is natural that such technology can be used to integrate functional blocks. The application of biotechnology, etc. is also a possibility.

[0176] The present disclosure may be implemented in any type of apparatus, device, or system (collectively referred to as a communications apparatus) that has a communications function. The communications apparatus may include a radio transceiver and processing / control circuitry. The radio transceiver may include a receiver and a transmitter, or both as functions. The radio transceiver (transmitter, receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like.

[0177] The communications device may include a radio transceiver and processing / control circuitry. The radio transceiver may include a receiver and a transmitter, or both. The radio transceiver (transmitter, receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like.

[0178] Non-limiting examples of communication 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 (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, communication-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above devices.

[0179] Communications equipment is not limited to portable or mobile equipment, but also includes non-portable or fixed equipment, devices, and systems of any kind, such as smart home devices (appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines, and any other "things" that may exist on an Internet of Things (IoT) network.

[0180] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0181] A communications device also includes devices such as controllers and sensors connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications device.

[0182] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0183] Those skilled in the art will appreciate that numerous variations and / or modifications may be made to the present disclosure as illustrated in the specific embodiments without departing from the spirit or scope of the disclosure as broadly described, and the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. [Table 1] [Table 2]

Claims

1. a transceiver unit that, in operation, receives control information indicating two or more beams for uplink transmission; and a circuit that, in operation, uses the two or more beams for a plurality of uplink transmission occasions based on the control information, wherein the circuit satisfies at least one condition for beam switching. Communication equipment.

2. each of the plurality of uplink transmission occasions is a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) transmission occasion from one or more transport blocks, a sounding reference signal (SRS), or a physical random access channel (PRACH) transmission occasion, and is defined by a slot index, a starting symbol, and a plurality of consecutive symbols; The communication device according to claim 1 .

3. each of the plurality of uplink transmission occasions is a transmission occasion among a plurality of repetitions of a PUCCH or a PUSCH in an inter-slot level repetition framework, or a transmission occasion among a plurality of nominal / actual repetitions of a PUCCH or a PUSCH in an intra-slot level repetition framework; The communication device according to claim 1 .

4. the transceiver unit further receives an explicit instruction from a base communication device to perform beam switching in the time domain, and the at least one condition for beam switching is further based on the explicit instruction. The communication device according to claim 1 .

5. the transceiver unit receives the control information by using at least one of downlink control information (DCI) signaling, medium access control layer control element (MAC CE) signaling, or radio resource control (RRC) signaling. The communication device according to claim 1 .

6. the at least one condition being that a first interval between two consecutive uplink transmission occasions among the plurality of uplink transmission occasions is equal to or greater than a required latency of beam switching; The communication device according to claim 1 .

7. the circuitry being further configured to provide assistance information to a base communication device regarding configuration of the two or more beams for the plurality of uplink transmission occasions. The communication device according to claim 1 .

8. the circuitry is configured to use each of the two or more beams in a periodic or sequential pattern for the plurality of uplink transmission occasions in response to satisfying the at least one condition. The communication device according to claim 1 .

9. The circuit comprises: determining a new invalid symbol having a length corresponding to a longer one of a length of the required latency of beam switching and a length of the single or multiple consecutive invalid symbols based on the single or multiple consecutive invalid symbols and a required latency of beam switching; determining the plurality of uplink transmission occasions based on the new invalid symbols; configured to use the two or more beams for the plurality of uplink transmission occasions in response to the determination. The communication device according to any one of claims 1 to 3.

10. the determination of the plurality of uplink transmission occasions based on the new invalid symbol is applied to all of a single or multiple consecutive legacy invalid symbols; The communication device according to claim 9.

11. The circuit comprises: determining a new invalid symbol consisting of one or more consecutive legacy invalid symbols and a required beam switching latency, wherein the one or more consecutive legacy invalid symbols do not overlap the required beam switching latency; determining the plurality of uplink transmission occasions based on the new invalid symbols; and further configured to use two or more beams for the plurality of uplink transmission occasions in response to the determining. The communication device according to any one of claims 1 to 3.

12. The circuit comprises: determining a new null symbol that combines a single or multiple consecutive legacy null symbols and a required latency for beam switching; determining the plurality of uplink transmission occasions based on the new invalid symbols; and further configured to use the two or more beams for a plurality of uplink transmission occasions in response to the determination. The communication device according to any one of claims 1 to 3.

13. each of the two or more beams configured with a set of power control parameters; The communication device according to claim 1 .

14. the circuitry is further configured to associate each of the two or more beams with at least one of a plurality of transmit precoders from a codebook for codebook-based transmission based on the control information. The communication device according to claim 1 .

15. one of the plurality of transmit precoders is indicated in DCI signaling by using at least a transmit precoding matrix indicator (TPMI) and / or a sounding reference signal resource indicator (SRI); 15. The communication device of claim 14.

16. The plurality of transmit precoders are indicated by reinterpreting at least TPMI and / or SRI in DCI signaling.

15. The communication device of claim 14.

17. the circuitry is configured to associate each of the two or more beams with at least one of a sounding reference signal (SRS) resource set for codebook-based transmission, the at least one SRS resource set being associated with a channel state information reference signal (CSI-RS) resource. The communication device according to claim 1 .

18. One of the SRS resource sets is indicated by using at least an SRI in DCI signaling.

18. The communication device of claim 17.

19. The SRS resource set is indicated by at least reinterpreting the SRI in the DCI signaling.

18. The communication device of claim 17.

20. receiving control information indicating two or more beams for uplink transmission; using the two or more beams for a plurality of uplink transmission occasions based on the control information, and satisfying at least one condition for beam switching; Communication method.

Images