Associate Transmission / Reception Points with Control Resource Sets

Abstract

In small cell mobility, the association between the CORESET and the TRP can be dynamically updated through L1 / L2 beam switching signaling, which may lead to RRC reconfiguration latency. To address the latency issue, in one aspect of the present disclosure, the UE: (1) receives the configuration of the CORESET and the configuration of the TRP set from the cell; (2) receives an index indication of the index of the CORESET from the cell; and (3) determines the TRP in the TRP set to be associated with the CORESET based on the index indication.

Description

Technical Field

[0001] The present disclosure generally relates to communication systems, and more particularly, to dynamically updating the association between a transmission reception point and a control resource set using L1 / L2 signaling. Background Art

[0002] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ multiple access techniques capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access techniques include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems.

[0003] These multiple access techniques have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at the urban, national, regional, or even global level. An example of a telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous evolution of mobile broadband promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvement in 5G NR technology. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the Invention

[0004] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of these aspects. This summary is not an extensive overview of all contemplated aspects, and is neither intended to identify key or critical elements of all aspects nor to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0005] In the multiple transmission and reception points (TRPs) based on multiple downlink control information (multi-DCI) in 5G NR, each control resource set (CORESET) can be associated with a TRP using parameters configured by radio resource control (RRC) (e.g., CORESETPoolindex), which can lead to RRC reconfiguration latency. However, in the L1 / L2-based inter-cell mobility, the CORESET beam can be dynamically switched across serving cells and non-serving cells. That is, the association between the CORESET and the TRP can be dynamically updated through L1 / L2 beam switching signaling.

[0006] To overcome the reconfiguration latency, the TRP index of each CORESET can be dynamically updated through L1 / L2 signaling. In particular, once the configuration of the CORESET and the configuration of the TRP set and the index indication of the index of the CORESET using L1 / L2 signaling are received at the user equipment (UE), the UE determines the TRP in the TRP set to be associated with the CORESET based on the index indication. Then, the communication between the UE and the base station can be based on the index of the CORESET.

[0007] To achieve the above and related purposes, one or more aspects include features that are fully described hereinafter and specifically pointed out in the claims. The following description and the accompanying drawings elaborate certain illustrative features of one or more aspects. However, these features are only several ways in which the principles of the various aspects can be adopted, and this specification is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a diagram showing an example of a wireless communication system and an access network.

[0009] Figure 2A is a diagram showing an example of a first frame according to aspects of the present disclosure.

[0010] Figure 2B is a diagram showing an example of downlink channels within a subframe according to aspects of the present disclosure.

[0011] Figure 2C is a diagram showing an example of a second frame according to aspects of the present disclosure.

[0012] Figure 2D is a diagram showing an example of uplink channels within a subframe according to aspects of the present disclosure.

[0013] Figure 3 is a diagram showing an example of a base station and a user equipment (UE) in an access network.

[0014] Figure 4It is a diagram showing an example of beam switching processing. The diagram includes a UE and multiple base stations.

[0015] Figure 5 It is a diagram showing an example of beam switching processing.

[0016] Figure 6 It shows the data flow between the UE and the base station, which according to some aspects of the present disclosure can overcome the latency of RRC reconfiguration.

[0017] Figure 7 It shows a flowchart of a wireless communication method according to some aspects of the present disclosure.

[0018] Figure 8 It is a diagram showing an example of the hardware implementation of a device. Detailed Description

[0019] The following detailed description related to the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configuration in which the concepts herein can be implemented. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be implemented without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring these concepts.

[0020] Several aspects of a telecommunications system will now be presented with reference to various devices and methods. These devices and methods will be described in the following detailed description and illustrated in the drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using electronic hardware, computer software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0021] By way of example, an element, or any portion of an element, or any combination of elements can be implemented as a "processing system" that includes one or more processors. Examples of processors include: microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system can execute software. Software should be construed broadly to mean: instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0022] Thus, in one or more exemplary embodiments, the described functionality can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include random access memory (RAM), read only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can store computer-executable code in the form of instructions or data structures and that can be accessed by a computer.

[0023] Figure 1 is a diagram illustrating an example of a wireless communication system and access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes base stations 102, UEs 104, evolved packet core (EPC) 160, and another core network 190 (e.g., 5G core (5GC)). Base stations 102 can include macro cells (high-power cellular base stations) and / or small cells (low-power cellular base stations). Macro cells include base stations. Small cells include femtocells, picocells, and microcells.

[0024] The base station 102 configured for 4G LTE (collectively referred to as the evolved universal mobile telecommunications system (UMTS) terrestrial radio access network (E-UTRAN)) can be connected to the EPC 160 via a first backhaul link 132 (e.g., the S1 interface). The base station 102 configured for 5G NR (collectively referred to as the next-generation RAN (NG-RAN)) can be connected to the core network 190 via a second backhaul link 184. Among other functions, the base station 102 can perform one or more of the following functions: transfer of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and device tracking, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 can communicate with each other directly or indirectly (e.g., via the EPC 160 or the core network 190) via a third backhaul link 134 (e.g., the X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 can be wired or wireless.

[0025] The base station 102 can communicate wirelessly with the UE 104. Each of the base stations 102 can provide communication coverage for a corresponding geographical coverage area 110. There can be overlapping geographical coverage areas 110. For example, the small cell 102' can have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network including small cells and macro cells can be referred to as a heterogeneous network. The heterogeneous network can also include a home evolved node BS (eNB) (HeNB), which can provide services to a restricted group (such as a closed subscriber group (CSG)). The communication link 120 between the base station 102 and the UE 104 can include an uplink (UL) (also referred to as the reverse link) transmission from the UE 104 to the base station 102 and / or a downlink (DL) (also referred to as the forward link) transmission from the base station 102 to the UE 104. The communication link 120 can use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication link can be via one or more carriers. The base station 102 / UE 104 can use a spectrum of up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz), with each carrier having a total of Yx MHz for transmission in each direction xallocate bandwidth in carrier aggregation of component carriers). The carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). Component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as the primary cell (PCell), and the secondary component carriers may be referred to as secondary cells (SCells).

[0026] Some UEs 104 may communicate with each other using device-to-device (D2D) communication links 158. The D2D communication links 158 may use DL / UL WWAN spectrum. The D2D communication links 158 may use one or more sidelink channels, such as the Physical Sidelink Broadcast Channel (PSBCH), Physical Sidelink Discovery Channel (PSDCH), Physical Sidelink Shared Channel (PSSCH), and Physical Sidelink Control Channel (PSCCH). D2D communication may be through various wireless D2D communication systems, such as, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards, LTE, or NR.

[0027] The wireless communication system may also include a Wi-Fi Access Point (AP) 150 that communicates with a Wi-Fi Station (STA) 152 via a communication link 154, e.g., in the 5 GHz unlicensed spectrum or a similar spectrum. When communicating in the unlicensed spectrum, the STA152 / AP 150 may perform a Clear Channel Assessment (CCA) before communication to determine if the channel is available.

[0028] The small cell 102' may operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell 102' may adopt NR and use the same unlicensed spectrum (e.g., 5 GHz, or similar) as that used by the Wi-Fi AP 150. The small cell 102' adopting NR in the unlicensed spectrum may improve the coverage of the access network and / or increase the capacity of the access network.

[0029] The electromagnetic spectrum is typically subdivided into various classes, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bandwidths have been defined as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). The frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, in various documents and articles, FR1 is often referred to (interchangeably) as the "sub-6 GHz" band. Similar naming issues sometimes occur with FR2 as well, which, although different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) defined by the International Telecommunication Union (ITU), is often referred to (interchangeably) as the "millimeter wave" band in documents and articles.

[0030] Taking the above aspects into account, unless specifically stated, it should be understood that the term "sub-6 GHz" or similar terms, if used in this document, can be broadly interpreted to mean frequencies that can be below 6 GHz, can be within FR1, or can include mid-band frequencies. Additionally, unless otherwise specified, it should be understood that the term "millimeter wave" or similar terms, if used in this document, can be broadly interpreted to mean frequencies that can include mid-band frequencies, can be within FR2, or can be within the EHF band.

[0031] Whether it is small cell 102' or large cell (e.g., macro cell), base station 102 can include and / or be referred to as an eNB, gNodeB (gNB), or other types of base stations. Some base stations, such as gNB 180, can operate in traditional sub-6 GHz spectrum, millimeter wave frequencies, and / or near millimeter wave frequencies to communicate with UE 104. When gNB 180 operates at millimeter wave or near millimeter wave frequencies, gNB 180 can be referred to as a millimeter wave base station. Millimeter wave base station 180 can utilize beamforming 182 of UE 104 to compensate for path loss and short range. Base station 180 and UE 104 can each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate beamforming.

[0032] Base station 180 may transmit beamformed signals to UE 104 in one or more transmission directions 182'. UE 104 may receive beamformed signals from base station 180 in one or more reception directions 182''. UE 104 may also transmit beamformed signals to base station 180 in one or more transmission directions. Base station 180 may receive beamformed signals from UE 104 in one or more reception directions. Base station 180 / UE 104 may perform beam training to determine the optimal reception and transmission directions for each of base station 180 / UE 104. The transmission and reception directions of base station 180 may or may not be the same. The transmission and reception directions of UE 104 may or may not be the same.

[0033] EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, Serving Gateway 166, Multimedia Broadcast Multicast Service (MBMS) Gateway 168, Broadcast Multicast Service Center (BM-SC) 170, and Packet Data Network (PDN) Gateway 172. MME 162 may communicate with a Home Subscriber Server (HSS) 174. MME 162 is a control node that processes signaling between UE 104 and EPC 160. Generally, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transferred through Serving Gateway 166, which is itself connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation and other functions. PDN Gateway 172 and BM-SC 170 are connected to IP services 176. IP services 176 may include the Internet, intranet, IP Multimedia Subsystem (IMS), PS streaming services, and / or other IP services. BM-SC 170 may provide MBMS user service activation and delivery functions. BM-SC 170 may serve as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and may be used to schedule MBMS transmissions. MBMS Gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area for a particular broadcast service, and may be responsible for session management (start / stop) and collecting eMBMS-related charging information.

[0034] The core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may communicate with a unified data management (UDM) 196. The AMF 192 is a control node that processes signaling between the UE 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to an IP service 197. The IP service 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a packet switched (PS) streaming (PSS) service, and / or other IP services.

[0035] The base station may include and / or be referred to as a gNB, Node B, eNB, access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmission reception point (TRP), or some other suitable term. The base station 102 provides an access point for the UE 104 to the EPC 160 or the core network 190. Examples of the UE 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop computer, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a tablet computer, a smart device, a wearable device, a vehicle, a meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, or any other similar functional device. Some of the UEs 104 may be referred to as IoT devices (e.g., a parking meter, a gas pump, a toaster, a vehicle, a heart monitor, etc.). The UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.

[0036] Figure 2A FIG. 200 is an example showing a first subframe within the 5G NR frame structure. Figure 2B FIG. 230 is an example showing DL channels within a 5G NR subframe. Figure 2C FIG. 250 is an example showing a second subframe within the 5G NR frame structure. Figure 2DFIG. 280 is an example showing the UL channels within a 5G NR subframe. The 5G NR frame structure can be Frequency Division Duplexing (FDD), where for a particular set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to either DL or UL only, or it can be Time Division Duplexing (TDD), where for a particular set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to both DL and UL. In Figure 2A 、 2C the example provided, the 5G NR frame structure is assumed to be TDD, and subframe 4 is configured with slot format 28 (mostly DL), where D is DL, U is UL, and F is flexibly used between DL / UL, while subframe 3 is configured with slot format 1 (full UL). Although subframes 3 and 4 are shown as slot formats 1 and 28 respectively, any particular subframe can be configured with any one of the various available slot formats 0 - 61. Slot formats 0 and 1 are full DL and UL respectively. The other slot formats 2 - 61 include a mixture of DL, UL, and flexible symbols. The UE configures the slot format through the received Slot Format Indicator (SFI) (dynamically configured via Downlink Control Information (DCI), or semi-statically / statically configured via Radio Resource Control (RRC) signaling). Note that the following description also applies to the 5G NR frame structure of TDD.

[0037] Other wireless communication technologies can have different frame structures and / or different channels. A frame (10 ms) can be divided into 10 equally sized subframes (1 ms). Each subframe can include one or more time slots. A subframe can also include mini - slots, and a mini - slot can include 7, 4, or 2 symbols. Depending on the slot configuration, each slot can include 7 or 14 symbols. For slot configuration 0, each slot can include 14 symbols, while for slot configuration 1, each slot can include 7 symbols. The symbols on the DL can be Cyclic Prefix (CP) OFDM (CP - OFDM) symbols. The symbols on the UL can be CP - OFDM symbols (for high - throughput scenarios) or Discrete Fourier Transform (DFT) spread OFDM (DFT - s - OFDM) symbols (also known as Single - Carrier Frequency Division Multiple Access (SC - FDMA) symbols) (for power - limited scenarios; limited to single - stream transmission). The number of slots within a subframe is based on the slot configuration and numerology. For slot configuration 0, different numerologies μ0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe respectively. For slot configuration 1, different numerologies 0 to 2 allow 2, 4, and 8 slots per subframe respectively. Thus, for slot configuration 0 and numerology μ, there are 14 symbols / slot and 2 µtime slots / sub-frames. The subcarrier spacing and symbol length / duration are functions of the parameter set. The subcarrier spacing can be equal to 2 µ * 15 kHz, where μ is the parameter set from 0 to 4. Thus, the subcarrier spacing for parameter set μ = 0 is 15 kHz, and the subcarrier spacing for parameter set μ = 4 is 240 kHz. The symbol length / duration is inversely proportional to the subcarrier spacing. Figures 2A - 2D An example of time slot configuration 0 is provided, with 14 symbols per time slot and 4 time slots per sub-frame for parameter set μ = 2. The time slot duration is 0.25 ms (milliseconds), the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs (microseconds). Within a set of frames, there may be one or more frequency-division multiplexed different bandwidth parts (BWPs) (see Figure 2B ). Each BWP can have a specific parameter set.

[0038] The resource grid can be used to represent the frame structure. Each time slot includes resource blocks (RBs) (also known as physical RBs (PRBs)) that extend 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0039] As Figure 2A shown, some of the REs carry reference (pilot) signals (RSs) for the UE. The RSs can include demodulation RSs (DM-RSs) (denoted as R for a specific configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RSs) for channel estimation at the UE. The RSs can also include beam measurement RSs (BRSs), beam refinement RSs (BRRSs), and phase tracking RSs (PT-RSs).

[0040] Figure 2BShows an example of various DL channels within a subframe of a frame. The Physical Downlink Control Channel (PDCCH) carries DCI within one or more Control Channel Elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), where each CCE includes six Resource Element Groups (REGs), and each REG includes 12 consecutive Resource Elements (REs) in the OFDM symbols of an RB. The PDCCH within a BWP can be referred to as a Control Resource Set (CORESET). The UE is configured to monitor PDCCH candidates in the PDCCH search space (e.g., common search space, UE-specific search space) during the PDCCH monitoring occasion on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs can be located at higher and / or lower frequencies across the entire channel bandwidth. The Primary Synchronization Signal (PSS) can be in symbol 2 of a specific subframe of the frame. The PSS is used by the UE 104 to determine the subframe / symbol timing and the physical layer identity. The Secondary Synchronization Signal (SSS) can be in symbol 4 of a specific subframe of the frame. The SSS is used by the UE to determine the physical layer cell identity group number and the radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the Physical Cell Identifier (PCI). Based on the PCI, the UE can determine the location of the above-mentioned DM-RS. The Physical Broadcast Channel (PBCH) carrying the Master Information Block (MIB) can be logically grouped with the PSS and SSS to form a Synchronization Signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth and the System Frame Number (SFN). The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH, such as System Information Blocks (SIBs) and paging information.

[0041] As Figure 2C shown, some of the REs carry DM-RS (indicated as R for a specific configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE can transmit DM-RS for the Physical Uplink Control Channel (PUCCH) and for the Physical Uplink Shared Channel (PUSCH). The PUSCH DM-RS can be transmitted in the previous one or two symbols of the PUSCH. The PUCCH DM-RS can be transmitted with different configurations, depending on whether a short PUCCH or a long PUCCH is being transmitted, and depending on the specific PUCCH format used. The UE can transmit a Sounding Reference Signal (SRS). The SRS can be transmitted in the last symbol of the subframe. The SRS can have a comb structure, and the UE can transmit the SRS in one of the combs. The SRS can be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0042] Figure 2D FIG. 2 shows an example of various UL channels within a subframe of a frame. The position of the PUCCH can be as indicated in a configuration. The PUCCH carries uplink control information (UCI), such as a scheduling request, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and a hybrid automatic repeat request (HARQ) ACK / NACK feedback. The PUSCH carries data and can additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0043] Figure 3 FIG. 3 is a block diagram of a base station 310 that communicates with a UE 350 in an access network. In the DL, IP packets from the EPC 160 can be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functions. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a media access control (MAC) layer. The controller / processor 375 provides RRC layer functions associated with the broadcast of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), mobility between radio access technologies (RATs), and measurement configuration for UE measurement reporting; PDCP layer functions associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with the transfer of upper layer packet data units (PDUs), error correction via ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functions associated with the mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and prioritized handling of logical channels.

[0044] The transmit (TX) processor 316 and the receive (RX) processor 370 implement the layer 1 functions associated with various signal processing functions. Layer 1 includes the physical (PHY) layer, which may include error detection of the transmission channel, forward error correction (FEC) encoding / decoding of the transmission channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 processes the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). Then, the encoded and modulated symbols can be split into parallel streams. Then, each stream can be mapped to OFDM subcarriers, multiplexed with reference signals (such as pilot signals) in the time domain and / or frequency domain, and then combined using the inverse fast Fourier transform (IFFT) to generate a physical channel carrying a stream of time-domain OFDM symbols. The OFDM stream is precoded spatially to generate multiple spatial streams. Channel estimates from the channel estimator 374 can be used to determine the encoding and modulation schemes, as well as for spatial processing. The channel estimates can be derived from reference signals transmitted by the UE 350 and / or channel condition feedback. Then, each spatial stream can be provided to a different antenna 320 via a separate transmitter 318 TX. Each transmitter 318 TX can modulate an RF carrier with the corresponding spatial stream for transmission.

[0045] At the UE 350, each receiver 354 RX receives signals via its corresponding antenna 352. Each receiver 354 RX recovers the information modulated onto the RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement the layer 1 functions associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined by the RX processor 356 into a single stream of OFDM symbols. Then, the RX processor 356 uses the fast Fourier transform (FFT) to convert the stream of OFDM symbols from the time domain to the frequency domain. The frequency-domain signal includes a separate stream of OFDM symbols for each subcarrier of the OFDM signal. The symbols on each subcarrier, as well as the reference signals, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions can be based on the channel estimates computed by the channel estimator 358. Then, the soft decisions are decoded and deinterleaved to recover the data and control signals originally transmitted by the base station 310 on the physical channel. Then, the data and control signals are provided to the controller / processor 359, which implements the layer 3 and layer 2 functions.

[0046] The controller / processor 359 may be associated with a memory 360 that stores program code and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP data packets from the EPC 160. The controller / processor 359 is also responsible for error detection using the ACK and / or NACK protocols to support HARQ operations.

[0047] Similar to the functions related to DL transmission with the base station 310, the controller / processor 359 provides RRC layer functions associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functions associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functions associated with transfer of upper layer PDUs, error correction via ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functions associated with mapping between logical and transport channels, multiplexing of MAC SDUs on TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel prioritization.

[0048] Channel estimates derived by the channel estimator 358 from reference signals or feedback transmitted by the base station 310 may be used by the TX processor 368 to select an appropriate coding and modulation scheme and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with the corresponding spatial stream for transmission.

[0049] UL transmission is processed at the base station 310 in a manner similar to that related to the receiver function of the UE 350. Each receiver 318RX receives signals via its corresponding antenna 320. Each receiver 318RX recovers the information modulated onto the RF carrier and provides the information to the RX processor 370.

[0050] The controller / processor 375 may be associated with a memory 376 that stores program code and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using the ACK and / or NACK protocols to support HARQ operations.

[0051] Figure 4 FIG. 400 is a diagram illustrating an example of beam switching processing. FIG. 400 includes a UE 402 and multiple base stations 404. The UE is served by PCI 0 associated with the base station 404, while PCI 3 and PCI 4 are neighboring cells. In Figure 4 FIG. 400, L1 / L2 inter-cell mobility may occur via beam switching across serving and non-serving cells. In some instances, each serving or non-serving cell may have a single or multiple TRPs (e.g., base stations) sharing the same PCI. Figure 4 Examples include configurations with a single TRP per serving or non-serving cell. The TCI state or spatial relationship of the downlink / uplink beam of a serving cell may be quasi-co-located (QCL) with the SSB of the PCI from the same serving cell or an adjacent non-serving cell. For example, as Figure 4 shown, the TCI state may be QCL with the SSB from PCI 0. In some instances, adjacent non-serving cells may be utilized to provide beam indication.

[0052] Figure 5 FIG. 500 is a diagram illustrating an example of beam switching processing. FIG. 500 includes a UE 502 and multiple base stations 504 and is configured similar to Figure 4 the UE and multiple base stations. For example, the UE 502 may enter the connected mode state after initial access (IA) on a serving cell with PCI 0 504. The UE 502 may measure and report layer 3 (L3) metrics for detected neighboring PCIs (e.g., PCI 1 - PCI 6). The PCIs that may be included in the L3 measurement 506 may include PCI 1 - PCI 6, as Figure 5As shown. Based on the L3 measurement 506, the network can configure the TCI state associated with a subset of the measured neighboring PCIs. For example, the network can configure the TCI states associated with PCI 0, PCI 3, and PCI 4, where PCI 0, PCI 3, and PCI 4 are from neighboring non-serving cells. The UE 502 can also be configured to have L1 measurements for the configured TCI states. In some aspects, the PCIs (e.g., PCI 0, PCI 3, PCI 4) can be a set of PCIs defined for the L1 measurement 508. For example, the UE 502 can perform L1 measurements of PCI 0, PCI 3, and PCI 4. Based on the L1 measurements, the network can activate the TCI state associated with the neighboring PCI to serve the UE 502. For example, based on the L1 measurements of PCI 0, PCI 3, and PCI 4, the network can activate the TCI state associated with PCI 4 to serve the UE 502. The UE can perform an updated L3 report. For example, the updated L3 report can include a different set of PCIs (e.g., PCI 0, PCI 3 - PCI 5, and PCI 7 - PCI 9). Based on the updated L3 report, the network can hand over the serving cell from PCI 0 to PCI 4. The network can also configure a new TCI state associated with the updated L1 measurement PCI set (e.g., PCI 4, PCI 7, and PCI 8).

[0053] Figure 6 A data stream 600 between the UE 602 and the base station 604 is shown, which according to certain aspects of the present disclosure can overcome the reconfiguration latency of radio resource control (RRC). The UE 602 can correspond to Figure 1 the UE 104 in Figure 3 the UE 350 in Figure 4 the UE 402 in, or Figure 5 the UE 502 in Figure 1 the base station 102 in Figure 1 the gNB 180 in Figure 3 the base station 310 in Figure 4 the base station 404 in, or Figure 5 the base station 504 in. As described above, the UE 602 and the base station 604 can be configured to operate at millimeter wave frequencies and / or near millimeter wave frequencies. When the base station 604 operates at millimeter wave or near millimeter wave frequencies, the base station 604 can be referred to as a millimeter wave base station. The millimeter wave base station 604 can utilize beamforming with the UE 602 to compensate for path loss and short range. The base station 604 and the UE 602 can each include multiple antennas (such as antenna elements, antenna boards, and / or antenna arrays) to facilitate beamforming.

[0054] In L1 / L2-based inter-cell mobility, the control resource set (CORESET) beam can be dynamically switched across serving and non-serving cells. That is, the association between the CORESET and a set of transmission and reception points (TRPs) can be dynamically updated via L1 / L2 beam switching signaling, which can reduce the RRC reconfiguration latency. To overcome the reconfiguration latency, the TRP index of each CORESET can be dynamically updated via L1 / L2 signaling.

[0055] In Figure 6 , the UE 602 can receive the configuration for the CORESET and the TRP (i.e., 606) from the base station 604. The UE 602 can also receive an index indication 608 of the index of the CORESET using L1 / L2 signaling from the base station 604. At block 610, the UE 602 can also determine the TRP (or the TRP index in the set of TRP indices) in the set of TRPs to be associated with the CORESET based on the index indication. Then, the communication 612 between the UE 602 and the base station 604 can be based on the index of the CORESET.

[0056] In one aspect, the UE 602 can receive the index indication 608 via downlink control information (DCI). In another aspect, the UE 602 can receive the index indication 608 via a media access control (MAC) control element (CE) (MAC-CE) indicating the index. For example, once the CORESET beam is switched to a new TRP, the base station 604 can send DCI or MAC-CE to indicate the new TRP index associated with the CORESET.

[0057] The UE 602 can implicitly determine the index based on the activated transmission configuration indication (TCI) state. For example, once the TCI state of the CORESET is activated and the CORESET beam is switched to a new beam, the index of the new TRP to be associated with the CORESET is implicitly indicated by the index of the TRP transmitting the quasi-co-located (QCL) source reference signal in the TCI state.

[0058] In one aspect, the UE 602 can determine that the activated TCI state is for the CORESET and indicate the reference signal as QCL of QCL-TypeD. In this aspect, the index to be associated with the CORESET is determined to be the same as the index associated with the reference signal.

[0059] In another aspect, the UE 602 may determine that the activated TCI state is for a CORESET and indicate a synchronization signal block (SSB) of a physical cell identifier (PCI) as the quasi - co - location (QCL) of a QCL - TypeD source. In this aspect, the index to be associated with the CORESET is determined based on the reference signal of the SSB of the PCI that is the QCL - TypeD source.

[0060] For the above two aspects, the index may be one of the following: a TRP index indicating one of the TRPs; a TRP index associated with a PCI index indicating a physical cell identifier (PCI); or a TRP index associated with a cell index indicating a cell. Additionally, in the presence of a TRP index configured by RRC for the CORESET, the new TRP index will overwrite the RRC - configured TRP index. That is, the UE 602 may have received an RRC configuration that configures a second index that indicated a second TRP associated with the CORESET before the index indication, and the index indication may overwrite the second index with this index.

[0061] In Figure 6 In one aspect, the UE 602 may transmit a communication 612 of an acknowledgement (ACK) or a negative ACK (NACK) to the base station 604 based on the received physical downlink shared channel (PDSCH), where the PDSCH is scheduled by the received PDCCH of the CORESET based on an index indicating the association between the TRP and the CORESET.

[0062] In another aspect, the UE 602 may receive a communication 612 from the base station 604 on a physical downlink shared channel (PDSCH), where the PDSCH is scheduled by the received PDCCH of the CORESET based on an index indicating the association between the TRP and the CORESET. The received communication 612 may include a PDSCH based on a PDSCH scrambling sequence that is based on the index.

[0063] In another aspect, the UE 602 may receive a communication 612 from the base station 604 on a physical downlink shared channel (PDSCH), where the PDSCH is scheduled by the received PDCCH of the CORESET based on an index indicating the association between the TRP and the CORESET. The received communication 612 may include a PDSCH based on a PDSCH rate - matching pattern that is based on the index.

[0064] Figure 7 FIG. 700 is a flowchart of a method of wireless communication according to certain aspects of the present disclosure. The method may be performed by a device in communication with a base station (e.g., Figure 1the base station 102 in Figure 1 the gNB 180 in Figure 3 the base station 310 in Figure 4 the base station 404 in, or Figure 5 the UE (e.g., Figure 1 the UE 104 in Figure 3 the UE 350 in Figure 4 the UE 402 in, or Figure 5 the UE 502 in) performs. In Figure 7 optional operations are indicated by dashed lines.

[0065] In Figure 7 at 702, the UE may receive the configuration of the CORESET and the configuration of the TRP set from the base station. At 704, the UE may also receive an index indication of the CORESET using L1 / L2 signaling from the base station. Then, the communication between the UE and the base station may be based on the index of the CORESET.

[0066] In one aspect, the UE may receive the index indication via downlink control information (DCI). In another aspect, the UE may receive the index indication via a media access control (MAC) control element (CE) (MAC-CE) indicating the index. For example, once the CORESET beam switches to a new TRP, the base station may send DCI or MAC-CE to indicate the new TRP index associated with the CORESET.

[0067] In Figure 7 at 706, the UE may implicitly determine the index based on the activated TCI state. For example, once the TCI state of the CORESET is activated and the CORESET beam switches to a beam or a new TRP, the new TRP index associated with the CORESET is implicitly indicated by the index of the TRP transmitting the quasi-co-location (QCL) source reference signal in the activated TCI state.

[0068] In one aspect, the UE may determine that the activated TCI state is for the CORESET and indicate a reference signal as the QCL of the QCL-TypeD source. In this aspect, the index to be associated with the CORESET is determined to be the same as the index associated with the reference signal.

[0069] In another aspect, the UE may determine that the activated TCI state is for the CORESET and indicate the SSB of the physical cell identifier (PCI) as the QCL of the QCL-TypeD source. In this aspect, the index to be associated with the CORESET is determined based on the SSB reference signal of the PCI as the QCL-TypeD source. For example, if the TCI state is activated for the CORESET and there is an SSB with PCI 4 in the TCI state as the QCL-TypeD RS, the TRP index associated with the CORESET is the TRP index that transmits the SSB with PCI 4.

[0070] For the above two aspects, the index may be one of the following: a TRP index indicating one of the TRPs; a TRP index associated with a PCI index indicating the PCI; or a TRP index associated with a cell index indicating the cell. In addition, in the presence of a TRP index configured in the RRC for the CORESET, the new TRP index will overwrite the RRC-configured TRP index. That is, the UE may have received an RRC configuration that configures a second index, which indicates a second TRP associated with the CORESET, and the index indication may overwrite the second index with this index.

[0071] In Figure 7 at 710, the UE may transmit an acknowledgement (ACK) or a negative ACK (NACK) to the base station based on the received physical downlink shared channel (PDSCH), which is scheduled by the received PDCCH of the CORESET based on an index indicating the association between the TRP and the CORESET. For example, the UE sends the ACK / NACK for the PDSCH scheduled by the CORESET associated with the TRP index 1 back to TRP 1 by using the uplink channel or resource associated with the TRP index 1.

[0072] In Figure 7In this case, the UE can also receive communications from the base station on the PDSCH, which is scheduled by the received PDCCH of the CORESET based on an index indicating the association between the TRP and the CORESET. In one aspect, at 712, the communications received from the base station can include a PDSCH based on a PDSCH scrambling sequence, which is based on the index. For example, the UE uses the PDSCH scrambling sequence associated with the TRP index 1 to descramble the PDSCH scheduled by the CORESET associated with the TRP index 1. In another aspect, at 714, the received communications can include a PDSCH based on a PDSCH rate matching pattern, which is based on the index. For example, the UE uses the rate matching pattern associated with the TRP index 1 to perform the rate matching pattern for the reception of the PDSCH scheduled by the CORESET associated with the TRP index 1.

[0073] Figure 8 FIG. 800 is a diagram illustrating an example of a hardware implementation of apparatus 802, which is a UE and includes a cellular baseband processor 804 (also referred to as a modem) coupled to a cellular RF transceiver 822 and one or more subscriber identity module (SIM) cards 820, an application processor 806 coupled to a secure digital (SD) card 808 and a screen 810, a Bluetooth module 812, a wireless local area network (WLAN) module 814, a global positioning system (GPS) module 816, and a power supply 818. The cellular baseband processor 804 communicates with the UE 104 and / or the BS 102 / 180 via the cellular RF transceiver 822. The cellular baseband processor 804 may include a computer-readable medium / memory. The computer-readable medium / memory may be non-transitory. The cellular baseband processor 804 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. When the software is executed by the cellular baseband processor 804, it causes the cellular baseband processor 804 to perform the various functions described above. The computer-readable medium / memory may also be used to store data manipulated by the cellular baseband processor 804 when the software is executed. The cellular baseband processor 804 further includes a receiving component 830, a communication manager 832, and a transmitting component 834. The communication manager 832 includes one or more of the illustrated components. The components within the communication manager 832 may be stored in the computer-readable medium / memory and / or configured as hardware within the cellular baseband processor 804. The cellular baseband processor 804 may be a component of the UE 350 and may include at least one of the memory 360 and / or the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the apparatus 802 may be a modem chip and only include the baseband processor 804, while in another configuration, the apparatus 802 may be the entire UE (e.g., see Figure 3of 350), and includes additional modules of the above-described apparatus 802.

[0074] The communication manager 832 includes a determination component 840 configured to determine, based on an index indication, a TRP in the TRP set to be associated with a CORESET, e.g., as described in connection with Figure 7 described. The determination component 840 may also implicitly determine the index based on an activated TCI state.

[0075] The apparatus may include additional components that perform each block of the algorithms in the above-described Figure 7 flowcharts. Thus, each block in the above-described Figure 7 flowcharts may be performed by a component, and the apparatus may include one or more of these components. The components may be one or more hardware components specifically configured to perform the processing / algorithm, implemented by a processor configured to perform the processing / algorithm, stored within a computer-readable medium for implementation by the processor, or some combination thereof.

[0076] As described above, the apparatus 802 may include a TX processor 368, an RX processor 356, and a controller / processor 359. Thus, in one configuration, the above components may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited for the above components. In one configuration, the apparatus 802, particularly the cellular baseband processor 804, includes components for receiving a configuration of a control resource set (CORESET) and a configuration of a set of transmission and reception points (TRPs) from a cell; components for receiving an index indication of an index of the CORESET from the cell; and components for determining, based on the index indication, a TRP in the TRP set to be associated with the CORESET. The above components may be one or more of the components of the device 802 configured to perform the functions recited for the above components. As described above, the apparatus 802 may include a TX processor 368, an RX processor 356, and a controller / processor 359. Thus, in one configuration, the above components may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited for the above components.

[0077] It will be appreciated that the specific order or hierarchy of the blocks in the disclosed processing / flowcharts is an illustration of example methods. Depending on design preferences, it will be appreciated that the specific order or hierarchy of the blocks in the processing / flowcharts may be rearranged. Additionally, some blocks may be combined or omitted. The accompanying method claims present the elements of the various blocks in a sample order and are not meant to be limited to the specific order or hierarchy presented.

[0078] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects as well. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the claim language, wherein elements recited in the singular are not intended to mean "one and only one" unless explicitly stated, but rather "one or more." Terms such as "if," "when," and "whereas" are to be construed as "under the following conditions," rather than referring to an immediate temporal relationship or reaction. That is, these phrases, such as "when," do not refer to an immediate action in response or during the occurrence of an action, but rather only mean that if the condition is met, then the action will occur, without requiring a specific or immediate time limitation on the occurrence of the action. The term "exemplary" as used herein means "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated, the term "some" means one or more. Combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "any combination of A, B, C, or any thereof" include any combination of A, B, and / or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "any combination of A, B, C, or any thereof" can be only A, only B, only C, A and B, A and C, or A and B and C, where any such combination can include one or more members or multiple members of A, B, or C. All structural and functional equivalents of the elements of the aspects described in this disclosure, known or later coming to be known to those of ordinary skill in the art, are expressly incorporated herein by reference and are intended to be encompassed by the claims. Further, nothing disclosed herein is intended to be dedicated to the public, whether or not such disclosure is explicitly recited in the claims. The words "module," "mechanism," "element," "device," etc. shall not be used in place of the word "component." Thus, no claim element should be construed as a means-plus-function unless the phrase "means for" is expressly recited with respect to that element.

[0079] The following examples are merely illustrative and may be combined with other embodiments or aspects of the teachings described herein, but are not limited thereto.

Claims

1. A method for wireless communication of a user equipment (UE), comprising: Receiving a configuration of a control resource set (CORESET) and a configuration of a set of transmission and reception points (TRPs) from a cell; Receiving an index indication of the index of the CORESET from the cell using L1 / L2 signaling or implicit signaling; And Determining, based on the index indication, the TRP in the set of TRPs to be associated with the CORESET.

2. The method according to claim 1, wherein the index indication is received by at least one of downlink control information (DCI) or a media access control (MAC) control element (CE), MAC-CE indicating the index.

3. The method according to claim 1, further comprising implicitly determining the index based on an activated transmission configuration indication (TCI) state.

4. The method according to claim 3, further comprising determining that the activated TCI state is for the CORESET and indicates a quasi-co-location (QCL) of a reference signal as a QCL-TypeD source, wherein the index to be associated with the CORESET is determined to be the same as the index associated with the reference signal.

5. The method according to claim 3, further comprising determining that the activated TCI state is for the CORESET and indicates a synchronization signal block (SSB) of a physical cell identifier (PCI) as a QCL-TypeD source, wherein the index to be associated with the CORESET is determined based on the reference signal of the SSB of the PCI as the QCL-TypeD source.

6. The method according to claim 1, wherein the index is a TRP index indicating one of the TRPs.

7. The method according to claim 1, wherein the index is associated with a PCI index indicating a physical cell identifier (PCI).

8. The method according to claim 1, wherein the index is associated with a cell index indicating the cell.

9. The method according to claim 1, further comprising: Receiving a radio resource control (RRC) configuration configuring a second index, the second index indicating a second TRP to be associated with the CORESET; And Overwriting the second index with the index.

10. The method according to claim 1, further comprising based on a received physical downlink shared channel (PDSCH) transmission acknowledgement (ACK) or negative acknowledgement (NACK), NACK, the PDSCH being scheduled by a received physical downlink control channel (PDCCH) of the CORESET based on the index indicating the association between the TRP and the CORESET.

11. The method according to claim 1, further comprising receiving on a physical downlink shared channel (PDSCH), the PDSCH being scheduled by a received physical downlink control channel (PDCCH) of the CORESET based on the index indicating the association between the TRP and the CORESET, wherein the receiving comprises receiving the PDSCH based on a PDSCH scrambling sequence, the PDSCH scrambling sequence being based on the index.

12. The method according to claim 1 further includes receiving on a physical downlink shared channel (PDSCH), where the PDSCH is scheduled by the received physical downlink control channel (PDCCH) of the CORESET based on the index indicating the association between the transmission and reception point (TRP) and the CORESET, and where the receiving includes receiving the PDSCH based on a PDSCH rate matching pattern, and the PDSCH rate matching pattern is based on the index.

13. An apparatus for wireless communication includes: a memory; and at least one processor coupled to the memory and configured to: receive a configuration of a control resource set (CORESET) and a configuration of a set of transmission and reception points (TRPs) from a cell; receive an index indication of an index of the CORESET from the cell using L1 / L2 signaling or implicit signaling; and determine a TRP in the set of TRPs to be associated with the CORESET based on the index indication.

14. The apparatus according to claim 13, wherein the index indication is received through at least one of a downlink control information (DCI) or a media access control (MAC) control element (CE), MAC-CE indicating the index.

15. The apparatus according to claim 13, wherein the at least one processor is further configured to implicitly determine the index based on an activated transmission configuration indication (TCI) state.

16. The apparatus according to claim 15, wherein the at least one processor is further configured to determine that the activated TCI state is for the CORESET and indicates a quasi-co-location (QCL) of a reference signal as a QCL-TypeD source, and the index to be associated with the CORESET is determined to be the same as the index associated with the reference signal.

17. The apparatus according to claim 15, wherein the at least one processor is further configured to determine that the activated TCI state is for the CORESET and indicates a synchronization signal block (SSB) of a physical cell identifier (PCI) as a QCL-TypeD source, and the index to be associated with the CORESET is determined based on the reference signal of the SSB of the PCI as the QCL-TypeD source.

18. The apparatus according to claim 13, wherein the index is a TRP index indicating one of the TRPs.

19. The apparatus according to claim 13, wherein the index is associated with a PCI index indicating a physical cell identifier (PCI).

20. The apparatus according to claim 13, wherein the index is associated with a cell index indicating the cell.

21. The apparatus according to claim 13, wherein the at least one processor is further configured to: receive a radio resource control (RRC) configuration configuring a second index, where the second index indicates a second TRP associated with the CORESET; and override the second index with the index.

22. The apparatus according to claim 13, wherein the at least one processor is further configured to transmit an acknowledgement ACK or a negative acknowledgement NACK based on a received physical downlink shared channel PDSCH, the PDSCH being scheduled by a received physical downlink control channel PDCCH of the CORESET based on the index indicating the association between the TRP and the CORESET.

23. The apparatus according to claim 13, wherein the at least one processor is further configured to receive on a physical downlink shared channel PDSCH, the PDSCH being scheduled by a received physical downlink control channel PDCCH of the CORESET based on the index indicating the association between the TRP and the CORESET, wherein the receiving comprises receiving the PDSCH based on a PDSCH scrambling sequence, the PDSCH scrambling sequence being based on the index.

24. The apparatus according to claim 13, wherein the at least one processor is further configured to receive on a physical downlink shared channel PDSCH, the PDSCH being scheduled by a received physical downlink control channel PDCCH of the CORESET based on the index indicating the association between the TRP and the CORESET, wherein the receiving comprises receiving the PDSCH based on a PDSCH rate matching pattern, the PDSCH rate matching pattern being based on the index.

25. An apparatus for wireless communication, the apparatus being a device at a user equipment UE, comprising: means for receiving a configuration of a control resource set CORESET and a configuration of a set of transmission reception points TRP from a cell; means for receiving, using L1 / L2 signaling or implicit signaling, an index indication of the index of the CORESET from the cell; and means for determining, based on the index indication, a TRP in the set of TRPs to be associated with the CORESET.

26. The apparatus according to claim 25, wherein the index indication is received via at least one of a downlink control information DCI or a media access control MAC control element CE, MAC-CE indicating the index.

27. The apparatus according to claim 25, further comprising: means for implicitly determining the index based on an activated transmission configuration indication TCI state.

28. The apparatus according to claim 27, further comprising means for determining that the activated TCI state is for the CORESET and indicating a quasi co-location QCL of a reference signal as a QCL-TypeD source, wherein the index to be associated with the CORESET is determined to be the same as the index associated with the reference signal.

29. The apparatus according to claim 27, further comprising A component of quasi - co - location (QCL) that determines that the activated TCI state is for the CORESET and indicates a synchronization signal block (SSB) indicating a physical cell identifier (PCI) as a QCL - TypeD source, wherein the index to be associated with the CORESET is determined based on the reference signal of the SSB of the PCI of the QCL that is the QCL - TypeD source.

30. The apparatus according to claim 25, wherein the index is a TRP index indicating one of the TRPs.

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