Cell identifier used for PUCCH / PUSCH path loss reference or beam reference signal

Abstract

The apparatus is configured to provide beam indications, TCI states, or spatial relationships based on reference signals of non-serving cells and to receive beam indications based on RSs of non-serving cells and possibly receive path loss RS configurations.

Description

Technical Field

[0001] The present disclosure relates generally to communication systems, and more particularly, to directional beam-based wireless communications. Background Art

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies 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 technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. One example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continued mobile broadband evolution released by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (for example, in the case of the Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvements to 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 is a simplified summary of one or more aspects in order to provide a basic understanding of such 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 will be presented later.

[0005] Aspects presented herein provide additional mobility between different cells and enable a base station to provide improved service to a UE by beam switching across a serving cell and one or more non-serving cells. In some examples, these aspects may be applied to layer 1 (L1) or layer 2 (L2) inter-cell mobility based on beam management for a serving cell and one or more non-serving cells. Each serving cell may have: a single TRP with a PCI or multiple TRPs using the same PCI. Each TRP in a serving cell with multiple TRPs may have a different TRP ID.

[0006] In order to provide improved mobility for the UE, the base station may indicate a TCI state for downlink communication or a spatial relationship for uplink communication based on a quasi-co-location (QCL) relationship with a reference signal of another cell (e.g., a neighboring cell or a non-serving cell). For example, the base station may indicate a TCI state or spatial relationship for the UE that is QCLed with an SSB of a non-serving cell. In other examples, the base station may indicate a TCI state or spatial relationship for the UE based on a QCL relationship with a CSI-RS of a non-serving cell or a PRS of a non-serving cell. When the base station indicates an uplink beam for the UE based on a QCL relationship with a reference signal from a non-serving cell, the UE may determine the path loss based on a signal from the non-serving cell.

[0007] In one aspect of the present disclosure, methods, computer-readable media, and apparatus are provided.

[0008] To accomplish the foregoing and related ends, one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features are indicative of only some of the various ways in which the principles of the various aspects may be employed, and this description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram illustrating an example of a wireless communication system and an access network.

[0010] Figure 2A is a diagram illustrating an example of a first frame according to various aspects of the present disclosure.

[0011] Figure 2B is a diagram illustrating an example of DL channels within a subframe according to various aspects of the present disclosure.

[0012] Figure 2C is a diagram illustrating an example of a second frame according to various aspects of the present disclosure.

[0013] Figure 2D is a diagram illustrating an example of UL channels within a subframe according to various aspects of the present disclosure.

[0014] Figure 3 is a schematic diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0015] Figure 4 is a schematic diagram illustrating an example of a beam switching process. Figure 5 is a communication flow illustrating example communications between a UE, a serving cell, and a non-serving cell, including utilizing a PL RS from the non-serving cell for transmission of PUCCH, PUSCH, PRACH, and non-positioning SRS from the UE.

[0016] Figure 6 FIG. 4 is a communication flow illustrating example communications between a UE, a serving cell, and a non-serving cell, including transmission of a beam indication reference signal from the non-serving cell. Figure 7 is a flow chart of an example method for wireless communication at a user equipment served by a serving cell of a base station.

[0017] Figure 8 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0018] Figure 9 is a flow chart of an example method of conducting wireless communications at a base station.

[0019] Figure 10 is a diagram illustrating an example of a hardware implementation for an example apparatus. DETAILED DESCRIPTION

[0020] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be implemented. In order to provide a thorough understanding of the various concepts, the detailed description includes specific details. However, it will be apparent to those skilled in the art that these concepts may be implemented without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0021] Several aspects of telecommunications systems will now be presented with reference to various apparatuses and methods. These apparatuses and methods will be described in the following detailed description and illustrated in the accompanying drawings by means of various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may 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.

[0022] For example, an element or any part of an element or any combination of elements can be implemented as a "processing system", which includes one or more processors. The example of a processor includes: a microprocessor, a microcontroller, a graphics processing unit (GPU), a central processing unit (CPU), an application processor, a digital signal processor (DSP), a reduced instruction set operation (RISC) processor, a system on a chip (SoC), a baseband processor, a field programmable gate array (FPGA), a programmable logic device (PLD), a state machine, a gated logic, a discrete hardware circuit, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in a processing system can execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language or other names, software should be broadly interpreted as meaning an instruction, an instruction set, a code, a code segment, a program code, a program, a subroutine, a software component, an application, a software application, a software package, a routine, a subroutine, an object, an executable file, a thread of execution, a process, a function etc.

[0023] Accordingly, in one or more exemplary embodiments, the described functions can be implemented with hardware, software, or any combination thereof. If implemented with software, the functions can be stored on a computer-readable medium or encoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. The storage medium can be any available medium 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, a combination of the above-mentioned types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0024] Figure 1 1 is a schematic 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 a base station 102, a UE 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). A macro cell includes a base station. Small cells include femto cells, pico cells, and micro cells.

[0025] Base stations 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via a first backhaul link 132 (e.g., an S1 interface). Base stations 102 configured for 5G NR (collectively referred to as the Next Generation RAN (NG-RAN)) can interface with the core network 190 via a second backhaul link 184. Among other functions, the base stations 102 can also perform one or more of the following functions: transmission 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 transmission of warning messages. Base stations 102 can communicate with each other directly or indirectly (eg, through EPC 160 or core network 190) via a third backhaul link 134 (eg, an X2 interface). First backhaul link 132, second backhaul link 184, and third backhaul link 134 can be wired or wireless.

[0026] Base stations 102 can communicate wirelessly with UEs 104. Each of base stations 102 can provide communication coverage for a corresponding geographic coverage area 110. There can be overlapping geographic coverage areas 110. For example, a 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 that includes both small cells and macro cells can be referred to as a heterogeneous network. A heterogeneous network can also include a home evolved Node B (eNB) (HeNB), which can provide services to a restricted group called a closed subscriber group (CSG). The communication link 120 between base station 102 and UE 104 can include uplink (UL) (also known as reverse link) transmissions from UE 104 to base station 102 and / or downlink (DL) (also known as forward link) transmissions from base station 102 to UE 104. The communication link 120 can use multiple-input multiple-output (MIMO) antenna technology, which includes spatial multiplexing, beamforming, and / or transmit diversity. The communication link can be over one or more carriers. Base station 102 / UE 104 can use spectrum with a bandwidth of up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) for transmission in each direction. The carriers may be adjacent to each other 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 a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

[0027] Certain UEs 104 may communicate with each other using device-to-device (D2D) communication links 158. The D2D communication links 158 may use the DL / UL WWAN spectrum. The D2D communication links 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be performed over a variety of wireless D2D communication systems, such as WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0028] 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 in, for example, the 5 GHz unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) before communicating to determine whether the channel is available.

[0029] The small cell 102' can operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell 102' can adopt NR and use the same unlicensed spectrum (e.g., 5 GHz, etc.) used by the Wi-Fi AP 150. The small cell 102' adopting NR in the unlicensed spectrum can improve the coverage of the access network and / or increase the capacity of the access network.

[0030] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified with the frequency range names FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). Frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the "sub-6 GHz" band in various documents and articles. Similar naming issues sometimes arise with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0031] In view of the above, unless otherwise specified, it should be understood that if the term "sub-6 GHz" is used herein, it can be broadly referred to as a frequency that can be less than 6 GHz, can be within FR1, or can include mid-band frequencies. In addition, unless otherwise specified, it should be understood that if the term "millimeter wave" is used herein, it can be broadly referred to as a frequency that can include mid-band frequencies, can be within FR2, or can be within the EHF band.

[0032] Base station 102 (whether a small cell 102' or a large cell (e.g., a macro base station)) can include and / or be referred to as an eNB, a gNodeB (gNB), or another type of base station. Some base stations, such as gNB 180, can operate in the traditional sub-6 GHz spectrum, in millimeter wave frequencies, and / or near millimeter wave frequencies to communicate with UE 104. When gNB 180 operates in 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 with 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.

[0033] Base station 180 may transmit beamformed signals in one or more transmit directions 182′ to UE 104. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 182″. UE 104 may also transmit beamformed signals in one or more transmit directions to base station 180. Base station 180 may receive beamformed signals in one or more receive directions from UE 104. Base station 180 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of base station 180 / UE 104. The transmit direction and receive direction for base station 180 may be the same or different. The transmit direction and receive direction for UE 104 may be the same or different.

[0034] EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. MME 162 may communicate with a Home Subscriber Server (HSS) 174. MME 162 is a control node that handles signaling between UE 104 and EPC 160. Generally, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transmitted through Serving Gateway 166, which itself is 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, an intranet, an IP Multimedia Subsystem (IMS), PS streaming services, and / or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The 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. The MBMS gateway 168 may be used to distribute MBMS services to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area broadcasting a specific service, and may be responsible for session management (start / stop) and collecting eMBMS-related billing information.

[0035] 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 handles signaling between the UE 104 and the core network 190. Typically, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are transported through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to the IP services 197. The IP services 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), packet switched (PS) stream (PSS) services, and / or other IP services.

[0036] A 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 functional unit, basic service set (BSS), extended service set (ESS), transmit reception point (TRP), or some other appropriate terminology. Base station 102 provides an access point to EPC 160 or core network 190 for UE 104. Examples of UE 104 include a cellular phone, a smartphone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio unit, 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 device, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, or any other similarly functional device. Some of UE 104 may be referred to as IoT devices (e.g., a parking meter, a gas pump, an oven, a vehicle, a heart monitor, etc.). 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 appropriate terminology.

[0037] The beam indication component 198 and the beam determination component are configured to provide beam indications (TCI status or spatial relationship) based on reference signals of non-serving cells and receive beam indications (and possible path loss RS configuration) based on RSs of non-serving cells.

[0038] Reference again Figure 1 In certain aspects, the UE 104 / base station 180 may be configured to provide beam indications (TCI status or spatial relationship) based on reference signals of non-serving cells, and to receive beam indications (and possibly path loss RS configuration) based on RSs of non-serving cells.

[0039] Figure 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. Figure 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. Figure 2Dis a diagram 280 showing an example of UL channels within a 5G NR subframe. The 5G NR frame structure can be frequency division duplex (FDD) (wherein, for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either DL or UL), or can be time division duplex (TDD) (wherein, for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both DL and UL). Figure 2A 、 2C In the example provided, the 5G / NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (most of which are DL), where D is DL, U is UL, and F is flexible between DL / UL, and subframe 3 is configured with slot format 1 (with full UL). Although subframes 3 and 4 are shown as having slot formats 1 and 28, respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2-61 include a mix of DL, UL and flexible symbols. The UE is configured to have a slot format (dynamically configured via DL control information (DCI) or semi-statically / statically configured via radio resource control (RRC) signaling) via a received slot format indicator (SFI). It should be noted that the following description also applies to the 5G NR frame structure as TDD.

[0040] Other wireless communication technologies may have different frame structures and / or different channels. A frame (10ms) may be divided into 10 equally sized subframes (1ms). Each subframe may include one or more time slots. A subframe may also include mini-slots, which may include 7, 4, or 2 symbols. Each time slot may include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot may include 14 symbols, while for time slot configuration 1, each time slot may include 7 symbols. The symbols on the DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL may 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 time slots within a subframe may be based on the time slot configuration and numerology. For slot configuration 0, different digital schemes μ0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For slot configuration 1, different digital schemes 0 to 2 allow 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and digital scheme μ, there are 14 symbols / slot and 2 μtime slots / subframes. The subcarrier spacing and symbol length / duration are functions of the digital scheme. The subcarrier spacing can be equal to 2 μ *15kHz, where μ is the digital scheme 0 to 4. Thus, digital scheme μ=0 has a subcarrier spacing of 15kHz, and digital scheme μ=4 has a subcarrier spacing of 240kHz. Symbol length / duration is inversely related to the subcarrier spacing. Figures 2A-2D An example is provided for slot configuration 0 with 14 symbols per slot and a digital scheme μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Within a frame set, there may be one or more different bandwidth parts (BWPs) that are frequency-division multiplexed (see Figure 2B ). Each BWP can have a specific number scheme.

[0041] The resource grid can be used to represent the frame structure. Each time slot includes a resource block (RB) (also known as a physical RB (PRB)), which extends over 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.

[0042] like Figure 2A As shown, some of the REs carry reference (pilot) signals (RS) for the UE. The RSs may include demodulation RSs (DM-RSs) (indicated 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 may also include beamforming RSs (BRSs), beam refinement RSs (BRRSs), and phase tracking RSs (PT-RSs).

[0043] Figure 2BExamples of various DL channels within a subframe of a frame are shown. 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), each CCE comprising six RE groups (REGs), each REG comprising 12 consecutive REs of an RB in an OFDM symbol. The PDCCH within a BWP may be referred to as a control resource set (CORESET). The UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during a PDCCH monitoring opportunity on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at larger and / or lower frequencies across the channel bandwidth. The primary synchronization signal (PSS) may be within symbol 2 of a particular subframe of the frame. The PSS is used by the UE 104 to determine subframe / symbol timing and physical layer identification. The secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of the frame. The SSS is used by the UE to determine the physical layer cell identity group number and 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 position of the above-mentioned DM-RS. The physical broadcast channel (PBCH) (which carries 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 that is not sent through the PBCH (e.g., system information block (SIB)), and paging messages.

[0044] like Figure 2C As shown, some of the REs carry DM-RSs for channel estimation at the base station (indicated as R for one specific configuration, but other DM-RS configurations are possible). The UE may send DM-RSs for the physical uplink control channel (PUCCH) and DM-RSs for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be sent in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be sent in different configurations depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used. The UE may send a sounding reference signal (SRS). The SRS may be sent in the last symbol of the subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the combs. The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0045] Figure 2D Examples of various UL channels within a subframe of a frame are shown. The PUCCH may be positioned as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), and hybrid automatic repeat request (HARQ) ACK / NACK feedback. The PUSCH carries data and may additionally be used to carry buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0046] Figure 3 3 is a block diagram of a base station 310 communicating with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to the controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functions. Layer 3 includes the radio resource control (RRC) layer, and layer 2 includes the service data adaptation protocol (SDAP) layer, the packet data convergence protocol (PDCP) layer, the radio link control (RLC) layer, and the medium access control (MAC) layer. The controller / processor 375 provides: RRC layer functions associated with the following: 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), inter-radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functions associated with the following: header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with the following: transmission of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with the following: 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 through HARQ, priority handling, and logical channel prioritization.

[0047] The transmit (TX) processor 316 and receive (RX) processor 370 implement layer 1 functions associated with various signal processing functions. Layer 1 (which includes the physical (PHY) layer) may include error detection on 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 handles 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)). The coded and modulated symbols can then be split into parallel streams. Each stream can then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time-domain OFDM symbol stream. The OFDM stream is spatially precoded to generate multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation schemes, as well as for spatial processing. The channel estimates may be derived based on a reference signal and / or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0048] At the UE 350, each receiver 354RX receives a signal via its respective antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement 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, the RX processor 356 can combine them into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols and reference signals on each subcarrier are recovered and demodulated by determining the most likely signal constellation point transmitted by the base station 310. These soft decisions can be based on channel estimates calculated by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally sent on the physical channel by the base station 310. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functionality.

[0049] The controller / processor 359 may be associated with a memory 360 that stores program codes 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 packets from the EPC 160. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0050] Similar to the functions described for DL ​​transmissions performed in conjunction 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: transmission of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with: mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0051] The TX processor 368 may select an appropriate coding and modulation scheme and facilitate spatial processing using channel estimates derived by the channel estimator 358 from a reference signal or feedback transmitted by the base station 310. The spatial streams generated by the TX processor 368 may be provided via separate transmitters 354TX to different antennas 352. Each transmitter 354TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0052] At the base station 310, the UL transmission is processed in a manner similar to that described in conjunction with the receiver functionality at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to an RX processor 370.

[0053] The controller / processor 375 may be associated with a memory 376 that stores program codes 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, and 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 ACK and / or NACK protocols to support HARQ operations.

[0054] Figure 4 4 is a diagram illustrating an example of a beam switching process. The diagram 400 includes a UE 402 and a plurality of base stations 404. The UE is being served by PCI0 associated with the base station 404, while PCI3 and PCI4 are neighboring cells. Figure 4 In the diagram 400 of FIGURE 4, L1 / L2 inter-cell mobility may occur via beam switching across serving and non-serving cells. In some cases, each serving cell may have a single or multiple TRPs (e.g., base stations) that share the same PCI. Figure 4 Examples include configurations with a single TRP per serving cell. The TCI state or spatial relationship of the downlink / uplink beams for the serving cell can be quasi-co-located (QCL) with the SSBs of the PCI from the same serving cell or an adjacent non-serving cell. For example, Figure 4 As shown, the TCI state can be QCL with SSB from PCI 0. In some cases, the neighboring non-serving cell can be used to provide beam indication.

[0055] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform a combined Figure 1 All aspects of 198 / 199.

[0056] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform a combined Figure 1 All aspects of 198 / 199.

[0057] The aspects presented herein provide additional mobility between different cells and enable a base station to provide improved service to a UE by beam switching across a serving cell and one or more non-serving cells. In some examples, these aspects can be applied to layer 1 (L1) or layer 2 (L2) inter-cell mobility based on beam management for a serving cell and one or more non-serving cells. Figure 4As described, each serving cell may have: a single TRP with a PCI, or multiple TRPs using the same PCI. Each TRP in a serving cell with multiple TRPs may have a different TRPID. Although aspects described herein illustrate a single TRP for a serving cell, these aspects may also be applied by a serving cell with multiple TRPs.

[0058] To provide improved mobility for the UE, the base station may indicate a TCI state for downlink communication or a spatial relationship for uplink communication based on a quasi-co-location (QCL) relationship with a reference signal of another cell (e.g., a neighboring cell or a non-serving cell). For example, the base station may indicate a TCI state or spatial relationship for the UE that is QCLed with an SSB of a non-serving cell. In other examples, the base station may indicate a TCI state or spatial relationship for the UE based on a QCL relationship with a CSI-RS of a non-serving cell or a PRS of a non-serving cell. When the base station indicates an uplink beam for the UE based on a QCL relationship with a reference signal from a non-serving cell, the UE may determine the path loss based on a signal from the non-serving cell.

[0059] refer to Figure 5, illustrates a communication flow 500 for communication between a UE, a serving cell, and a non-serving cell, including the use of a PL RS from a non-serving cell for transmission of PUCCH, PUSCH, PRACH, and non-positioned SRS from the UE. The term "non-positioned SRS" may be used herein to refer to an SRS used for beam management, an SRS used for codebook-based antenna switching, or an SRS used for non-codebook-based antenna switching. Communication flow 500 includes an exchange of communications between a UE 502, a serving cell 504, and a non-serving cell 506. Serving cell 504 may send a spatial relationship indication 508 based on an RS of non-serving cell 506 (with the PCI / TRP of non-serving cell 506) to UE 502. For example, serving cell 504 may configure multiple spatial relationships for UE 502, and one or more of the configured spatial relationships may have a QCL relationship with a reference signal from non-serving cell 506. Serving cell 504 may then indicate one of the spatial relationships configured for UE 504. If UE 504 moves, serving cell 504 may indicate a spatial relationship that is different from the spatial relationship configured for the UE. UE 502 may use the spatial relationship to determine one or more parameters for uplink transmissions. For example, UE 502 may use the spatial relationship to determine a directional beam to use for transmitting an uplink transmission. In some examples, UE 502 may use the spatial direction to determine a beam to use for uplink transmissions to the serving cell. Optionally, serving cell 504 may send a path loss reference signal configuration 510 that instructs UE 502 to use reference signals from non-serving cell 506 to calculate path loss as part of determining the transmit power for uplink transmissions. Serving cell 504 may indicate the path loss reference signal using the PCI / TRP ID of non-serving cell 506. Although spatial relationship indication 508 and path loss reference signal configuration 510 are shown as separate lines, in some examples, serving cell 504 may send the indication of the spatial relationship and the indication of the path loss reference signal in the same message. In some examples, the same indication can indicate both the spatial relationship and the path loss reference signal. For example, if serving cell 504 indicates a spatial relationship for uplink transmissions from the UE based on reference signals of non-serving cells, UE 502 can also determine the path loss based on the indicated reference signals of the non-serving cells.

[0060] Non-serving cell 506 transmits a reference signal 512, such as an SSB, CSI-RS, or PRS. UE 502 receives reference signal 512 from the non-serving base station based on the serving cell's indication of a path loss reference signal. At 514, UE 502 measures the path loss of reference signal 512 from non-serving cell 506. At 516, the UE determines an uplink transmission power based at least in part on the measured path loss. The UE may calculate the uplink transmission power based on a formula including multiple factors. The measured path loss may be one factor used to determine the uplink transmission power. UE 502 then transmits an uplink transmission 518 using a spatial relationship with a QCL relationship to the reference signal from non-serving cell 506. UE 502 may also transmit uplink transmission 518 using the uplink transmission power determined at 516. As shown at 518, the uplink transmission may include one or more of a PUCCH, a PUSCH, a PRACH, or an SRS. In some examples, the SRS may be a non-positioning SRS, such as an SRS used for beam management or antenna switching. UE 502 may transmit an uplink transmission 518 using an uplink beam having a spatial relationship with an RS of a non-serving cell. In some examples, uplink transmission 518 may be transmitted from UE 502 to serving cell 504.

[0061] In addition to the identifier of the non-serving cell, at 508 and / or 510, the serving cell 504 may also indicate additional information about the beam indication RS and / or path loss reference signal. The identifier of the non-serving cell may include a PCI ID or a TRP ID in the non-serving cell. If the reference signal of the non-serving beam is an SSB, the serving cell may provide additional information about the SSB. For example, the serving cell may indicate configuration information about the SSB, such as one or more of the following: the SSB carrier frequency of the non-serving cell SSB, the half-frame index of the non-serving cell SSB, the SCS of the non-serving cell SSB, the periodicity of the non-serving cell SSB, the SMTC window configuration of the non-serving cell SSB, the SFN offset of the non-serving cell SSB, or the transmission power of the non-serving cell SSB. If the reference signal of the non-serving cell is a CSI-RS or a PRS, the serving cell may indicate the corresponding resource ID and / or resource set ID for the non-serving cell CSI-RS or PRS.

[0062] refer to Figure 6, describes a communication flow 600 that includes the transmission of a beam indication reference signal from a non-serving cell. A "beam indication RS" may refer to a reference signal used to indicate a beam for use by a UE. For example, for a downlink beam used by UE 602 to receive downlink transmissions from a base station, the beam indication reference signal may be a reference signal indicated in a TCI state configuration for UE 502. For example, the TCI state may indicate a QCL relationship between a beam used for downlink transmission and a particular reference signal. A reference signal having a QCL relationship with the beam may be referred to as a beam indication reference signal. Similarly, a base station may indicate a beam for uplink transmission by a UE in a spatial relationship configured for the UE. The spatial relationship may indicate a QCL relationship between an intended beam and a reference signal. A reference signal indicated in a spatial relationship may be referred to as a beam indication reference signal.

[0063] Figure 6 The communication flow 600 in FIG. 6 includes communications exchanged between a UE 602, a serving cell 604, and a non-serving cell 606. Optional aspects are illustrated using dashed lines. The serving cell 604 may send a TCI state indication 614 that indicates a TCI state for the UE 602 based on a reference signal of the non-serving cell 606. For example, when indicating the TCI state to the UE 602, the serving cell 604 may indicate that the reference signal is for the non-serving cell by including an identifier for the non-serving cell (e.g., with the PCI / TRP of the non-serving cell 606). The identifier of the non-serving cell may include the PCI ID or TRP ID of the non-serving cell. For example, the serving cell 604 may configure multiple TCI states for the UE 602, and one or more of the configured TCI states may have a QCL relationship with a reference signal from the non-serving cell 606. The serving cell 604 may then indicate a TCI state among the TCI states configured for the UE 602. If UE 602 moves, serving cell 604 can indicate a TCI state that is different from the TCI state configured for UE 602. UE 602 can use the TCI state to determine one or more parameters for receiving downlink transmission 618. For example, UE 602 can use the TCI state to determine a directional beam to use for receiving downlink transmission 618 from a base station. In some examples, UE 602 can use the TCI state to determine a beam to use for receiving downlink transmission 618 from serving cell 504.

[0064] In some examples, serving cell 604 may send a TCI state indication 614 based on measurement results from UE 602. For example, UE 602 may measure one or more reference signals 608 from serving cell 604 and one or more reference signals 610 from non-serving cell 606. Reference signal 608 from serving cell 604 may include any one of an SSB, a CSI-RS, or a PRS. Reference signal from non-serving cell 606 may include any one of an SSB, a CSI-RS, or a PRS. The UE may send measurement results 612 for reference signals of serving and non-serving cells to serving cell 604. Serving cell 604 may update the TCI state for UE 602 based on measurement results 612 from UE 602, e.g., activate the TCI state. For example, if the measurement results indicate better measurement results for reference signals from the non-serving cell (compared to the measurement results for reference signals from serving cell 604), serving cell 604 may indicate the TCI state based on the reference signals from the non-serving cell.

[0065] In addition to the identifier of the non-serving cell, at 614, the serving cell 604 may also indicate additional information about the beam indicator RS. If the reference signal of the non-serving beam is an SSB, the serving cell may, for example, provide additional information about the SSB at 614. For example, the serving cell may indicate configuration information about the SSB, such as one or more of the following: the SSB carrier frequency of the non-serving cell SSB, the half-frame index of the non-serving cell SSB, the SCS of the non-serving cell SSB, the periodicity of the non-serving cell SSB, the SMTC window configuration of the non-serving cell SSB, the SFN offset of the non-serving cell SSB, or the transmission power of the non-serving cell SSB. If the reference signal of the non-serving cell is a CSI-RS or a PRS, the serving cell may indicate the corresponding resource ID and / or resource set ID for the non-serving cell CSI-RS or PRS.

[0066] At 616, UE 602 determines beam information for receiving downlink communications based on a QCL relationship with a reference signal from a non-serving base station. For example, the beam indication reference signal can be a QCL type A, QCL type B, QCL class C, and / or QCL type D reference signal in a TCI state for indicating a downlink beam for UE 602 to use to receive downlink communications 618. A QCL type A relationship with the reference signal can indicate a relationship with a Doppler shift, Doppler spread, average delay, and / or delay spread with the reference signal from the non-serving base station. A QCL type B relationship with the reference signal can indicate a relationship with a Doppler shift and / or Doppler spread with the reference signal from the non-serving base station. A QCL type C relationship with the reference signal can indicate a relationship with a Doppler shift or average delay with the reference signal from the non-serving base station. A QCL type D relationship with the reference signal can indicate a relationship with a spatial or directional parameter of the reference signal from the non-serving base station. The indication 614 may instruct the UE 602 to use the TCI state for the downlink beam to receive one or more of the PDCCH, PDSCH, CSI-RS, or PRS.

[0067] The UE 602 then uses the determined beam information to receive downlink communications 618 from the base station. For example, the UE 602 may use the beam to receive one or more of a PDCCH, a PDSCH, a CSI-RS, or a PRS. In some examples, the downlink communications 618 may be sent from the serving cell 604 to the UE 602.

[0068] Figure 7 Flowchart 700 is a method for wireless communication at a UE served by a serving cell of a base station. Method 700 may be performed by a UE (e.g., UE 104, 350, 502, 602; apparatus 802). Optional aspects are illustrated using dashed lines. The method may enable the base station to provide additional mobility for the UE by indicating a spatial relationship based on a non-serving cell reference signal and / or a path loss reference signal.

[0069] At 702, the UE receives an indication from a serving cell for a beam or path loss reference signal based on a reference signal from a non-serving cell. As shown at 704, the beam indication of receiving action 702 may include a TCI state based on the reference signal from the non-serving cell. Figure 6 An example is shown where UE 602 receives a TCI status indication based on a reference signal from a non-serving cell 606. As shown at 706, the indication of receiving step 702 may include a spatial relationship based on a reference signal from a non-serving cell. For example, Figure 5An example of UE 502 receiving an indication of a spatial relationship based on a reference signal from a non-serving cell is shown. This reception may be performed, for example, by Figure 8 The receiving of the reference signal may be performed by the TCI state component 840 and / or the spatial relation component 842 of the apparatus 802. For example, if the reference signal is indicated as spatial relation, the receiving may be performed by the spatial relation component 842, and if the reference signal is indicated as being for TCI state, the receiving may be performed by the TCI state component 840, for example.

[0070] At 714, the UE exchanges communications with the serving cell based on the reference signal from the non-serving cell. For example, if the UE receives an indication of a TCI state at 704, exchanging communications with the serving cell at 714 may include receiving downlink communications from the serving cell using the TCI state based on the reference signal from the non-serving cell, as shown at 716. If the UE receives an indication of a spatial relationship at 706, exchanging communications with the serving cell at 714 may include sending uplink communications to the serving cell using the spatial relationship based on the reference signal from the non-serving cell, as shown at 718. The exchange of communications may be performed, for example, by Figure 8 The receiving component 830 and / or the sending component 834 of the device 802 are executed.

[0071] At 708, the indication is used to indicate the beam identifier and path loss reference signal for uplink transmission based on the reference signal for the non-serving cell. Such indication can be, for example, Figure 8 804 of the apparatus 802. In the case where the indication includes a path loss reference signal for uplink transmission indicated based on a reference signal of a non-serving cell, at optional 710, including measuring the path loss reference signal from the non-serving cell, and at also optional 712, including determining a transmission power for uplink transmission based on the path loss reference signal from the non-serving cell. The path loss reference signal measurement can be performed, for example, by the path loss reference signal measurement component 846, and determining the transmission power for uplink transmission can be performed, for example, by Figure 8 The transmission power component 848 of the device 802 is executed.

[0072] Exchanging communications with the serving cell with respect to 710, 712, 714 may include sending uplink transmissions using a transmission power determined based on a path loss reference signal from a non-serving cell.

[0073] With respect to 710-714, one option is that the uplink transmission includes at least one of PUCCH, PUSCH, PRACH, or SRS. An additional option is that the uplink transmission includes non-positional SRS, and that the UE transmits the non-positional SRS as part of beam management, codebook antenna switching, or non-codebook antenna switching.

[0074] Options for 708 include indicating a cell identifier for a non-serving cell. Additional options are that the cell identifier includes a PCI for a non-serving cell or a TRP identifier for a non-serving cell.

[0075] Another option regarding 708 includes: the path loss reference signal is the SSB of the non-serving cell, the CSI-RS of the non-serving cell, or the PRS of the non-serving cell. An additional option is: the indication is included in the configuration of the path loss reference signal, the configuration including at least one of the following: the carrier frequency of the SSB of the non-serving cell, the half-frame index of the SSB of the non-serving cell, the subcarrier spacing (SCS) of the SSB of the non-serving cell, the period of the SSB of the non-serving cell, the SMTC window configuration of the SSB of the non-serving cell, the time offset of the SSB of the non-serving cell, and / or the transmission power of the SSB of the non-serving cell. Another option is: the indication is included in the configuration of the path loss reference signal, the configuration including at least one of the following: the resource identifier (ID) of the CSI-RS of the non-serving cell and / or the resource set ID of the CSI-RS of the non-serving cell. A further option is that the indication is included in a configuration of a path loss reference signal, the configuration including at least one of: an ID for PRS from a non-serving cell and / or a resource set ID for PRS from a non-serving cell.

[0076] Another option is: wherein the beam indication includes a TCI state based on a reference signal from a non-serving cell, and exchanging communications with the serving cell includes receiving downlink communications using the TCI state based on the reference signal from the non-serving cell, including: the downlink communications received using the TCI state based on the reference signal from the non-serving cell include one or more of a PDCCH, a PDSCH, a CSI-RS, or a PRS. A further option includes: the TCI state includes a QCL relationship with the reference signal from the non-serving cell. Regarding the QCL relationship, one option includes: the QCL relationship is based on at least one of a Doppler shift, Doppler spread, average delay, delay spread, or spatial parameter relative to the reference signal of the non-serving cell.

[0077] Another option is: wherein the indication includes a spatial relationship based on a reference signal from a non-serving cell, and exchanging communications with the serving cell includes sending uplink communications using the spatial relationship based on the reference signal from the non-serving cell, which includes: the uplink communication sent using the TCI state based on the reference signal from the non-serving cell includes one or more of PUCCH, PUSCH, PRACH or SRS.

[0078] One option of method 700 for wireless communication at a user equipment (UE) served by a serving cell of a base station includes: the reference signal on which the indication is based is an SSB of a non-serving cell, a CSI-RS of a non-serving cell, or a PRS of a non-serving cell. Another option is: the indication is based on the SSB of the non-serving cell, and the UE further receives from the serving cell at least one of the following: a carrier frequency for the SSB of the non-serving cell, a half-frame index for the SSB of the non-serving cell, an SCS for the SSB of the non-serving cell, a period for the SSB of the non-serving cell, an SMTC window configuration for the SSB of the non-serving cell, a time offset for the SSB of the non-serving cell, and / or a transmit power for the SSB of the non-serving cell. A further option is: the indication is based on the CSI-RS of the non-serving cell, and the UE further receives from the serving cell at least one of the following: an ID for the CSI-RS of the non-serving cell and / or a resource set ID for the CSI-RS of the non-serving cell. A further option is that the indication is based on the PRS of the non-serving cell, and the UE also receives from the serving cell at least one of: a resource identifier (ID) for the PRS from the non-serving cell, and / or a resource set ID for the PRS from the non-serving cell.

[0079] Figure 9 Flowchart 900 is a method for wireless communication at a base station, wherein a UE is served by a serving cell of the base station. Method 900 may be performed by a base station (e.g., base station 102 / 180; apparatus 1002). Optional aspects are illustrated using dashed lines. The method may enable the base station to provide additional mobility for the UE by indicating a spatial relationship based on a non-serving cell reference signal and / or a path loss reference signal.

[0080] At 902, a base station transmits an indication of a beam or path loss reference signal based on a reference signal from a non-serving cell from a serving cell serving a UE. As shown in 904, the beam indication of transmitting action 902 may include a TCI state based on the reference signal from the non-serving cell. Figure 6An example is shown of a serving cell 604 of a base station sending a TCI status indication based on a reference signal from a non-serving cell 606 to a UE 602. Option 904 is that the downlink communication sent using the TCI status based on the reference signal from the non-serving cell includes one or more of: a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a channel state information reference signal (CSI-RS), or a positioning reference signal (PRS). As shown in 906, the indication of sending action 902 may include a spatial relationship based on the reference signal from the non-serving cell. For example, Figure 5 An example of a base station's serving cell 504 transmitting an indication of a spatial relationship based on a reference signal from a non-serving cell is shown. This transmission may be performed by, for example, Figure 10 The receiving of the reference signal may be performed by the TCI state transmission component 1040 and / or the spatial relationship transmission component 1042 of the apparatus 1002. For example, if the indication reference signal is a spatial relationship, the receiving may be performed by the spatial relationship transmission component 1042, and if the indication reference signal is indicated for a TCI state, the receiving may be performed by the TCI state transmission component 1040, for example.

[0081] At 910, a serving cell for a base station exchanges communications with a UE based on a reference signal from a non-serving cell.

[0082] For example, if the serving cell for the base station sends an indication of a TCI state, then at 912, exchanging communications with the UE at 910 may include sending downlink communications to the UE using the TCI state based on a reference signal from a non-serving cell. If the serving cell for the base station sends an indication of a spatial relationship, then at 914, exchanging communications with the UE at 910 may include receiving uplink communications from the UE using a spatial relationship based on a reference signal from a non-serving cell.

[0083] The exchange of communications may be performed, for example, by a receiving component 1030 and / or a sending component 1034 of the apparatus 1002 of FIG.

[0084] At optional 908, the indication is used to indicate the path loss reference signal from the non-serving cell, which can be Figure 10 The path loss reference signal indicator component 1044 is executed.

[0085] Additional options at 914 include: the indication includes a cell identifier for the non-serving cell. A further option is: the cell identifier includes a PCI for the non-serving cell or a TRP identifier for the non-serving cell. A further option is: the path loss reference signal is an SSB of the non-serving cell, a CSI-RS of the non-serving cell, or a PRS of the non-serving cell. An additional option is: the indication is included in a configuration of the path loss reference signal, the configuration including at least one of the following: a carrier frequency for the SSB of the non-serving cell, a half-frame timing for the SSB of the non-serving cell, an SCS for the SSB of the non-serving cell, a period for the SSB of the non-serving cell, an SMTC window configuration for the SSB of the non-serving cell, a time offset for the SSB of the non-serving cell, and / or a transmit power for the SSB of the non-serving cell. Another option is: the indication is included in a configuration of the path loss reference signal, the configuration including at least one of the following: an ID of the CSI-RS for the non-serving cell and / or a resource set ID for the CSI-RS of the non-serving cell. A still further option is that the indication is included in a configuration of a path loss reference signal, the configuration comprising at least one of: an ID for PRS from a non-serving cell, and / or a resource set ID for PRS from a non-serving cell.

[0086] At optional 912, where the indication is for indicating a TCI state based on a reference signal from a non-serving cell, exchanging communications with the serving cell includes sending downlink communications to the UE using the TCI state based on the reference signal from the non-serving cell.

[0087] At optional 914, where the indication is used to indicate a spatial relationship based on a reference signal from a non-serving cell, exchanging communications with the serving cell includes receiving uplink communications from the UE using a spatial relationship based on a reference signal from a non-serving cell. Additional options for 914 include: uplink communications received using a TCI state based on a reference signal from a non-serving cell include one or more of PUCCH, PUSCH, PRACH, or SRS. Another option is: downlink communications sent using a TCI state based on a reference signal from a non-serving cell include one or more of PDCCH, PDSCH, CSI-RS, or PRS. A further option is: the TCI state includes a QCL relationship with a reference signal from a non-serving cell. A further option is: the QCL relationship is based on at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, or spatial parameters relative to the reference signal of the non-serving cell.

[0088] Another option of 900 is that the reference signal on which the indication is based is the SSB of the non-serving cell, the CSI-RS of the non-serving cell, or the PRS of the non-serving cell. An additional option is that the indication is based on the SSB of the non-serving cell, and the base station also sends to the UE at least one of the following: the carrier frequency used for the SSB of the non-serving cell, the half-frame index used for the SSB of the non-serving cell, the SCS used for the SSB of the non-serving cell, the period of the SSB of the non-serving cell, the SMTC window configuration for the SSB of the non-serving cell, the time offset for the SSB of the non-serving cell, and / or the transmit power for the SSB of the non-serving cell. Another option is that the indication is based on the CSI-RS of the non-serving cell, and the base station also sends to the UE at least one of the following: the ID of the CSI-RS for the non-serving cell, and / or the resource set ID for the CSI-RS of the non-serving cell. A further option is that the indication is based on the PRS of the non-serving cell, and the base station also sends to the UE at least one of: an ID for the PRS from the non-serving cell and / or a resource set ID for the PRS from the non-serving cell.

[0089] Figure 8Schematic diagram 800 illustrates an example of a hardware implementation for an apparatus 802. Apparatus 802 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. Cellular baseband processor 804 communicates with UE 104 and / or BS 102 / 180 via cellular RF transceiver 822. Cellular baseband processor 804 may include computer-readable media / memory. The computer-readable media / memory may be non-transitory. Cellular baseband processor 804 is responsible for general processing, including executing software stored on the computer-readable media / memory. When executed by cellular baseband processor 804, the software enables 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 executing software. The cellular baseband processor 804 also includes a receive component 830, a communication manager 832, and a transmit component 834. The communication manager 832 includes one or more of the components shown. 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 TX processor 368, the RX processor 356, and the controller / processor 359 and / or the memory 360. In one configuration, the apparatus 802 may be a modem chip and include only the baseband processor 804, and in another configuration, the apparatus 802 may be the entire UE (e.g., see Figure 3 350) and includes the additional modules of device 802 discussed above.

[0090] The communications manager 832 may be configured to receive an indication from a serving cell based on a reference signal from a non-serving cell, e.g., as described in conjunction with Figure 7 For example, the communication manager 832 may include a TCI status component 840 configured to receive an indication of a TCI status based on a reference signal of a non-serving cell, such as described in conjunction with 704. The communication manager 832 may include a spatial relationship component 842 configured to receive an indication of a spatial relationship based on a reference signal of a non-serving cell, such as described in conjunction with 706. The communication manager 832 may also be configured to exchange communications with the serving cell based on the reference signal from the non-serving cell, such as described in conjunction with Figure 7For example, the apparatus 802 may include a receiving component 830 configured to receive downlink communications and a transmitting component 834 configured to transmit uplink communications. The communication manager 832 also includes a beam and path loss component 844 configured to indicate a beam identifier and a path loss reference signal for uplink transmission based on a reference signal for a non-serving cell, for example, as described in conjunction with Figure 7 The communication manager 832 also includes a path loss reference signal measurement component 846, which is configured to measure the path loss reference signal from the non-serving cell, for example, as described in conjunction with Figure 7 The communication manager 832 also includes a transmission power component 848 configured to determine the transmission power based on the measured path loss, for example, as described in conjunction with Figure 7 as described in step 712.

[0091] The apparatus may include executing Figure 7 and Figure 9 Each of the boxes in the algorithm in the above flowchart has an additional component. Therefore, Figure 7 and Figure 9 Each block in the above flowchart may be performed by a component, and the apparatus may include one or more of those components. The component may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0092] In one configuration, the apparatus 802 (and specifically the cellular baseband processor 804) includes means for receiving from a serving cell an indication of a beam or path loss reference signal from a non-serving cell, e.g., as in conjunction with Figure 7 702 described; for receiving an indication of the TCI state of the unit, for example, as shown and described in conjunction with this document Figure 7 704 as described; for receiving an indication of a spatial relationship unit, for example, as shown and described in conjunction with this document Figure 7 706 as described; for indicating the beam identifier and path loss reference signal for uplink transmission based on the reference signal for the non-serving cell, for example, as shown and described in conjunction with this document Figure 7 708 described; for measuring the path loss reference signal from the non-serving cell unit, for example, as shown and described in conjunction with this document Figure 7 710 as described; for determining the transmission power unit based on the measured path loss, for example, as shown and described in conjunction with this document Figure 7712 described; for exchanging communications with a serving cell based on a reference signal from a non-serving cell, for example, as shown and described in conjunction with this document Figure 7 714 as described; for receiving a downlink transmission unit based on a TCI state of a reference signal of a non-serving cell, as shown and described in conjunction with Figure 7 and a unit for transmitting an uplink transmission based on a spatial relationship with a reference signal from a non-serving cell, for example, as shown and described in conjunction with the present invention. Figure 7 716. The aforementioned means may be one or more of the aforementioned components of the apparatus 802 configured to perform the functions recited by the aforementioned means. As described above, the apparatus 8002 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Therefore, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller / processor 359, which are configured to perform the functions recited by the aforementioned means.

[0093] Figure 10 1000 is a diagram illustrating an example hardware implementation for an apparatus 1002. Apparatus 1002 is a base station and includes a baseband unit 1004. Baseband unit 1004 can communicate with UE 104 via a cellular RF transceiver. Baseband unit 1004 may include computer-readable media / memory. Baseband unit 1004 is responsible for general processing, including executing software stored on the computer-readable media / memory. When executed by baseband unit 1004, the software enables baseband unit 1004 to perform the various functions described above. The computer-readable media / memory may also be used to store data manipulated by baseband unit 1004 when executing the software. Baseband unit 1004 also includes a receiving component 1030, a communication manager 1032, and a transmitting component 1034. Communication manager 1032 includes one or more of the components shown. Components within communication manager 1032 may be stored in computer-readable media / memory and / or configured as hardware within baseband unit 1004. The baseband unit 1004 may be a component of the BS 310 and may include at least one of the TX processor 316 , the RX processor 370 , and the controller / processor 375 , and / or the memory 376 .

[0094] The communication manager 1032 includes a TCI status transmission component 1040 that sends an indication of the TCI status, for example, as combined with Figure 9 The communication manager 1032 also includes a spatial relationship transmission component 1042 that sends an indication of the spatial relationship, for example, as described in conjunction with Figure 9The communication manager 1032 also includes a path loss reference signal indicator component 1044 that indicates a path loss reference signal from a non-serving cell, for example, as described in conjunction with Figure 9 908 described.

[0095] The apparatus may include executing Figure 7 and Figure 9 Each of the boxes in the algorithm in the above flowchart has an additional component. Therefore, Figure 7 and Figure 9 Each block in the above flowchart may be performed by a component, and the apparatus may include one or more of those components. The component may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0096] In one configuration, the apparatus 1002 (and specifically the baseband unit 1004) includes means for transmitting, from a serving cell serving a UE, an indication of a beam or path loss reference signal based on a reference signal from a non-serving cell, e.g., as in conjunction with Figure 9 902 described; for sending an indication of the TCI state, for example, as combined Figure 9 904 described; for sending an indication of the spatial relationship unit, for example, in combination with Figure 9 906 described; for indicating the path loss reference signal unit from the non-serving cell, for example, as combined Figure 9 908 as described; for using a beam based on a reference signal from a non-serving cell to exchange communications with the UE unit, for example, as combined Figure 9 910 as described; for using a beam based on a TCI state of a non-serving cell reference signal to send a downlink transmission unit, for example, as combined Figure 9 912 as described; and a unit for receiving an uplink transmission using a beam based on a spatial relationship with a reference signal from a non-serving cell, for example, as combined Figure 9 914. The above-mentioned means may be one or more of the above-mentioned components of the apparatus 1002 configured to perform the functions recited by the above-mentioned means. As described above, the apparatus 1002 may include the TX processor 316, the RX processor 370, and the controller / processor 375. Therefore, in one configuration, the above-mentioned means may be the TX processor 316, the RX processor 370, and the controller / processor 375, which are configured to perform the functions recited by the above-mentioned means.

[0097] It should be understood that the specific order or hierarchy of blocks in the disclosed process / flowchart is illustrative of example methods. It should be understood that the specific order or hierarchy of blocks in the disclosed process / flowchart may be rearranged based on design preferences. In addition, some blocks may be combined or omitted. The accompanying method claims provide elements of the various blocks in an example order and are not intended to be limited to the specific order or hierarchy provided.

[0098] The foregoing description is provided so that any person skilled in the art can implement 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 can be applied to other aspects. Therefore, the claims are not intended to be limited to the various aspects shown herein, but to be given the full scope consistent with the language claims, wherein, unless explicitly stated otherwise, reference to a singular element is not intended to mean "one and only one", but "one or more". Terms such as "if", "when ..." and "while ..." should be interpreted as "under the conditions of ...", rather than meaning an immediate time relationship or reaction. That is, these phrases (e.g., "when ...") do not mean immediate action in response to the occurrence of an action or during the occurrence of an action, but only mean that the action will occur if the condition is met, but do not require a specific or immediate time constraint for the occurrence of the action. The word "exemplary" is used herein to mean "used as an example, instance or illustration". Any aspect described as "exemplary" herein is not necessarily interpreted as being preferred over other aspects or having advantages over other aspects. Unless otherwise explicitly stated, the term "some" refers to 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 “A, B, C, or any combination 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 “A, B, C, or any combination thereof” may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, where any such combination may include one or more members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come 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. In addition, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module,” “mechanism,” “element,” “device,” etc. may not be substitutes for the word “unit.” Thus, no claim element should be construed as a functional unit unless the element is explicitly recited using the phrase “means for….”

[0099] The following examples are merely illustrative and may be combined with other embodiments or aspects of the teachings described herein without limitation.

Claims

1. A method for wireless communication at a user equipment (UE) served by a serving cell of a base station, comprising: receiving, from the serving cell, an indication of a beam and path loss reference signal based on a reference signal from a non-serving cell, wherein the indication comprises a transmission configuration indication (TCI) state based on the reference signal from the non-serving cell; and exchanging communications with the serving cell using a beam based on the reference signal from the non-serving cell, wherein exchanging the communications with the serving cell comprises receiving downlink communications using the TCI state based on the reference signal from the non-serving cell.

2. The method according to claim 1, wherein The indication includes the path loss reference signal for uplink transmission indicated based on the reference signal of the non-serving cell, and the method further includes: measuring the path loss reference signal from the non-serving cell; and determining a transmission power for the uplink transmission based on the path loss reference signal from the non-serving cell, wherein exchanging the communications with the serving cell comprises sending the uplink transmission using the transmission power determined based on the path loss reference signal from the non-serving cell.

3. The method according to claim 2, wherein: The uplink transmission includes at least one of the following: a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical random access channel (PRACH), or a non-positioning sounding reference signal (SRS).

4. The method according to claim 3, wherein: The uplink transmission includes the non-positional SRS, and wherein the UE sends the non-positional SRS as part of beam management, codebook antenna switching, or non-codebook antenna switching.

5. The method according to claim 2, wherein: The indication is used to indicate the beam identifier and the path loss reference signal used for the uplink transmission based on the reference signal for the non-serving cell.

6. The method according to claim 2, wherein: The indication is used to indicate a cell identifier for the non-serving cell.

7. The method according to claim 6, wherein: The cell identifier includes a physical cell identity (PCI) for the non-serving cell or a transmit reception point (TRP) identifier for the non-serving cell.

8. The method according to claim 2, wherein: The path loss reference signal is a synchronization signal block (SSB) of the non-serving cell, a channel state information reference signal (CSI-RS) of the non-serving cell, or a positioning reference signal (PRS) of the non-serving cell.

9. The method according to claim 8, wherein The indication is included in a configuration of the path loss reference signal, the configuration comprising at least one of: a carrier frequency of the SSB used for the non-serving cell, a half-frame index of the SSB for the non-serving cell, a subcarrier spacing (SCS) of the SSB for the non-serving cell, a period of the SSB for the non-serving cell, a synchronization signal / physical broadcast channel block measurement time configuration (SMTC) window configuration for the SSB of the non-serving cell, a time offset for the SSB of the non-serving cell, or The transmission power of the SSB for the non-serving cell.

10. The method according to claim 8, wherein The indication is included in a configuration of the path loss reference signal, the configuration comprising at least one of: a resource identifier (ID) of the CSI-RS for the non-serving cell, or A resource set ID of the CSI-RS used for the non-serving cell.

11. The method according to claim 8, wherein The indication is included in a configuration of the path loss reference signal, the configuration comprising at least one of: a resource identifier (ID) for the PRS from the non-serving cell, or A resource set ID for the PRS from the non-serving cell.

12. The method according to claim 1, wherein The downlink communication received using the TCI state based on the reference signal from the non-serving cell includes one or more of: a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a channel state information reference signal (CSI-RS), or a positioning reference signal (PRS).

13. The method according to claim 1, wherein The TCI state includes a quasi co-location (QCL) relationship with the reference signal from the non-serving cell.

14. The method according to claim 13, wherein The QCL relationship is based on at least one of: a Doppler shift, a Doppler spread, an average delay, a delay spread, or a spatial parameter of the reference signal relative to the non-serving cell.

15. The method according to claim 1, wherein The indication includes a spatial relationship based on the reference signal from the non-serving cell, and Wherein exchanging the communications with the serving cell comprises sending uplink communications using the spatial relationship based on the reference signal from the non-serving cell.

16. The method according to claim 15, wherein The uplink communication includes one or more of the following: a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical random access channel (PRACH), or a sounding reference signal (SRS).

17. The method according to claim 1, wherein The reference signal on which the indication is based is a synchronization signal block (SSB) of the non-serving cell, a channel state information reference signal (CSI-RS) of the non-serving cell, or a positioning reference signal (PRS) of the non-serving cell.

18. The method according to claim 17, wherein: The indication is based on the SSB of the non-serving cell, and the UE further receives at least one of the following from the serving cell: a carrier frequency of the SSB used for the non-serving cell, a half-frame index of the SSB for the non-serving cell, a subcarrier spacing (SCS) of the SSB for the non-serving cell, a period of the SSB for the non-serving cell, a synchronization signal / physical broadcast channel block measurement time configuration (SMTC) window configuration for the SSB of the non-serving cell, a time offset for the SSB of the non-serving cell, or The transmission power of the SSB for the non-serving cell.

19. The method according to claim 17, wherein The indication is based on the CSI-RS of the non-serving cell, and the UE further receives at least one of the following from the serving cell: a resource identifier (ID) of the CSI-RS for the non-serving cell, or A resource set ID of the CSI-RS used for the non-serving cell.

20. The method according to claim 17, wherein The indication is based on the PRS of the non-serving cell, and the UE further receives at least one of the following from the serving cell: a resource identifier (ID) for the PRS from the non-serving cell, or A resource set ID for the PRS from the non-serving cell.

21. An apparatus for wireless communication at a user equipment (UE) served by a serving cell of a base station, comprising: Memory; as well as at least one processor coupled to the memory and configured to: receiving, from the serving cell, an indication of a beam and path loss reference signal based on a reference signal from a non-serving cell, wherein the indication comprises a transmission configuration indication (TCI) state based on the reference signal from the non-serving cell; and exchanging communications with the serving cell using a beam based on the reference signal from the non-serving cell, wherein exchanging the communications with the serving cell comprises receiving downlink communications using the TCI state based on the reference signal from the non-serving cell.

22. The device according to claim 21, wherein The indication includes the path loss reference signal for uplink transmission indicated based on the reference signal of the non-serving cell, wherein the at least one processor is further configured to: measuring the path loss reference signal from the non-serving cell; and determining a transmission power for the uplink transmission based on the path loss reference signal from the non-serving cell, wherein exchanging the communications with the serving cell comprises sending the uplink transmission using the transmission power determined based on the path loss reference signal from the non-serving cell.

23. The device according to claim 21, wherein The indication includes a spatial relationship based on the reference signal from the non-serving cell, and Wherein exchanging the communications with the serving cell comprises sending uplink communications using the spatial relationship based on the reference signal from the non-serving cell.

24. The apparatus according to claim 21, wherein The reference signal on which the indication is based is a synchronization signal block (SSB) of the non-serving cell, a channel state information reference signal (CSI-RS) of the non-serving cell, or a positioning reference signal (PRS) of the non-serving cell.

25. An apparatus for performing wireless communication at a base station, comprising: Memory; as well as at least one processor coupled to the memory and configured to: Transmitting, from a serving cell serving a user equipment (UE), an indication of a beam and path loss reference signal based on a reference signal from a non-serving cell, wherein the indication is used to indicate a spatial relationship based on the reference signal from the non-serving cell; and and exchanging communications with the UE using a beam based on the reference signal from the non-serving cell, wherein exchanging communications with the UE includes receiving uplink communications from the UE using the spatial relationship based on the reference signal from the non-serving cell.

26. The device according to claim 25, wherein The uplink communication includes one or more of the following: a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical random access channel (PRACH), or a sounding reference signal (SRS).

27. The apparatus according to claim 25, wherein The indication is used to indicate the path loss reference signal from the non-serving cell used for the uplink transmission.

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