Method and apparatus for quasi-collocation prioritization

Abstract

Various aspects are provided to allow a first wireless device (such as a UE or a base station) to prioritize beams simultaneously received from or transmitted to cells with different parameter designs or asynchronous to each other. The device determines a time overlap between a first signal from a first cell and a second signal from a second cell, wherein the second cell includes at least one of: a different parameter design from the first cell, or asynchronous timing relative to the first cell. The device applies a beam prioritization rule to select a beam associated with a first signal or a second signal carrying information in a separate beam. The device transmits information to or receives information from a second wireless device based on the selected beam. Thus, simultaneous beam conflict resolution for cells with different parameter designs or asynchronous timing can be improved.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Provisional Application Serial No. 62 / 897,967, filed on September 9, 2019, entitled “QUASI-COLOCATION PRIORITIZATION FOR SECONDARY CELL GROUP CHANGE WITH DIFFERENT NUMEROLOGY OR ASYNCHRONIZATION,” and U.S. Patent Application No. 17 / 013,025, filed on September 4, 2020, entitled “QUASI-COLOCATION PRIORITIZATION FOR SECONDARY CELL GROUP CHANGE WITH DIFFERENT NUMEROLOGY OR ASYNCHRONIZATION,” which are expressly incorporated herein by reference in their entireties. Technical Field

[0003] The present disclosure relates generally to communication systems, and more particularly to wireless communication systems between user equipment (UE) and base stations. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. 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.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different wireless devices to communicate at city, country, region, and even global levels. An example telecommunication standard is 5G New Radio (NR). 5G NR is a part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)) and other requirements. 5GNR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). Some aspects of 5G NR can be based on 4G Long Term Evolution (LTE) standards. 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

[0006] A brief summary of one or more aspects is given below to provide a basic understanding of such aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define 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 a more detailed description that will be presented later.

[0007] When a UE is simultaneously connected to multiple cells (e.g., in carrier aggregation or during make-before-break handover), the UE may simultaneously receive downlink signals from base stations in the multiple cells in separate beams. Thus, the UE and the base station(s) may determine the time overlap between the downlink channels from each cell. In such a case, the UE and the base station(s) prioritize the beams of the multiple cells according to one or more beam prioritization rules (described below) and determine which beam corresponding to one of the cells is to be selected for reception or transmission. The UE and the base station(s) may prioritize / select each beam on a per-symbol basis (i.e., when the UE monitors each symbol of each cell). However, when different cells have different parameter designs or are asynchronous in time, their symbol durations may be different or their symbol boundaries may not be aligned. Various aspects presented herein provide beam prioritization rules that address beam conflict resolution for cells with different parameter designs and / or asynchronous timing. For example, when cells have different parameter designs, the aspects presented herein enable the UE and base station(s) to determine a beam with priority on a per-symbol basis based on a specific cell. Similarly, when cells are asynchronous with each other and have misaligned symbol boundaries, the aspects presented herein enable the UE and base station(s) to determine a cell to be used as a timing reference for the UE and base station(s) to determine a prioritized beam on a per-symbol basis.

[0008] The present disclosure allows UEs and base stations to prioritize beams simultaneously received from or transmitted to cells with different parameter designs or asynchronous to each other according to various aspects. In one aspect where the UE is simultaneously connected to multiple cells with different parameter designs, the UE and base stations may apply beam prioritization rules to determine the beam of one of the cells on a per-symbol basis relative to a preconfigured cell or an indicated cell. In one example, the UE and base stations may apply beam prioritization rules to determine beams based on cells with shorter symbol durations. In another example, the UE and base stations may apply beam prioritization rules to determine beams based on cells indicated in a message from a base station. In another aspect where the UE is simultaneously connected to multiple cells that are asynchronous to each other, the UE and base stations may apply beam prioritization rules to determine the beam of one of the cells on a per-symbol boundary basis relative to a fixed, preconfigured or indicated cell. In yet another aspect, the UE and base station(s) may apply beam prioritization rules to determine beams on a per-symbol boundary basis relative to the cell from which the most recent downlink communication was received or to which the most recent uplink communication was transmitted.

[0009] In an additional aspect, when the UE and the base station(s) determine to receive a beam from or transmit a beam to one of the first cell or the second cell as described above, the UE may further feed back to the base station the timing difference between receiving each beam from each cell or transmitting each beam to each cell. The base station may then determine the beam that was successfully (or unsuccessfully) transmitted / received based on the timing difference. In an alternative aspect, the UE and the base station(s) may apply a beam prioritization rule to determine each beam only after completing the reception or transmission of consecutive transmissions with the same known beam indication (rather than on a per-symbol or per-symbol boundary basis). Alternatively, the UE may be restricted from simultaneously connecting to cells with different symbol durations or misaligned symbol boundaries (e.g., based on a beam prioritization rule or restricted by a base station). In this way, simultaneous beam conflict resolution for cells with different parameter designs or asynchronous with each other may be improved.

[0010] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a first wireless device, such as a UE or a base station. The apparatus determines a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a different parameter design from the first cell, or asynchronous timing relative to the first cell. The apparatus applies a beam prioritization rule for selecting a beam associated with a first signal of the first cell or a second signal of the second cell carrying information in a separate beam. The apparatus transmits information to a second wireless device (such as a base station or a UE) or receives information from the second wireless device based on the selected beam.

[0011] To achieve the foregoing and related ends, the one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and drawings set forth in detail certain illustrative features of the one or more aspects. However, these features are merely indicative of several of the various ways in which the principles of the various aspects may be employed, and this description is intended to cover all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0013] Figure 2A , 2B , 2C, and 2D are diagrams illustrating examples of a first 5G / NR frame, a DL channel within a 5G / NR subframe, a second 5G / NR frame, and a UL channel within a 5G / NR subframe, respectively.

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

[0015] Figure 4 is a diagram illustrating an example in which a UE is in communication with one or more base stations of different serving cells.

[0016] Figure 5 is a diagram illustrating an example make-before-break (MBB) handover procedure of a UE from a source base station to a target base station.

[0017] Figure 6 is a diagram illustrating an example of a UE undergoing an MBB handover from a source base station in a first cell to a target base station in a second cell.

[0018] Figure 7 is a diagram illustrating an example call flow between a UE and one or more base stations in one or more serving cells.

[0019] Figure 8is a flow chart of a wireless communication method.

[0020] Fig. 9 is a conceptual data flow diagram illustrating the flow of data between different devices / components in an example apparatus.

[0021] Fig.10 is a diagram illustrating an example of a hardware implementation for a device employing a processing system.

[0022] Fig.11 is a flow chart of a wireless communication method.

[0023] Fig.12 is a conceptual data flow diagram illustrating the flow of data between different devices / components in an example apparatus.

[0024] Fig.13 is a diagram illustrating an example of a hardware implementation for a device employing a processing system. DETAILED DESCRIPTION

[0025] 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 practiced. This detailed description includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid diluting such concepts.

[0026] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by 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 such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0027] As an example, an element, or any part of an element, or any combination of elements may be implemented as a "processing system" including one or more processors. Examples of processors include: microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout this disclosure. One or more processors in a processing system may execute software. Software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether it is described in software, firmware, middleware, microcode, hardware description languages, or other terms.

[0028] Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, these functions may be stored or encoded on a computer-readable medium as one or more instructions or codes. Computer-readable media include computer storage media. Storage media may be any available medium that can be accessed by a computer. As an example and not limitation, such computer-readable media may 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 computer-readable media of the above types, or any other medium that may be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0029] Figure 1 1 is a diagram illustrating an example of a wireless communication system and access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes 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. A small cell includes a femto cell, a pico cell, and a micro cell.

[0030] The base station 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via a first backhaul link 132 (e.g., an S1 interface). The base station 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 station 102 can also perform one or more of the following functions: delivery 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 equipment tracking, RAN information management (RIM), paging, positioning, and delivery of alert messages. The base stations 102 may communicate with each other directly or indirectly (eg, through the EPC 160 or the core network 190) over a third backhaul link 134 (eg, an X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 may be wired or wireless.

[0031] Base stations 102 may communicate wirelessly with UEs 104. Each base station 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102' may 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 may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group called a closed subscriber group (CSG). A communication link 120 between a base station 102 and a UE 104 may include an uplink (UL) (also known as a reverse link) transmission from the UE 104 to the base station 102 and / or a downlink (DL) (also known as a forward link) transmission from the base station 102 to the UE 104. The communication link 120 may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. These communication links may be over one or more carriers. The base station 102 / UE 104 may use spectrum of up to Y MHz (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.) bandwidth for each carrier allocated in a carrier aggregation for a total of up to Yx MHz (x component carriers) for transmission in each direction. The carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL compared to UL). The 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).

[0032] Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL / UL WWAN spectrum. The D2D communication link 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). The D2D communication may be through a variety of wireless D2D communication systems, such as, for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0033] The wireless communication system may further include a Wi-Fi access point (AP) 150 communicating with a Wi-Fi station (STA) 152 in the 5 GHz unlicensed spectrum via a communication link 154. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether the channel is available prior to communication.

[0034] The small cell 102' may operate in a licensed and / or unlicensed spectrum. When operating in an unlicensed spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed spectrum as used by the Wi-Fi AP 150. The small cell 102' employing NR in the unlicensed spectrum may boost the coverage of the access network and / or increase the capacity of the access network.

[0035] Whether a small cell 102' or a large cell (e.g., a macro base station), the base station 102 may include and / or be referred to as an eNB, a gB node (gNB), or another type of base station. Some base stations (such as gNB 180) may operate in traditional sub-6 GHz spectrum, millimeter wave (mmW) frequencies, and / or near mmW frequencies to communicate with UE 104. When the gNB 180 operates in mmW or near mmW frequencies, the gNB 180 may be referred to as a mmW base station. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 mm and 10 mm. The radio waves in this band may be referred to as millimeter waves. Near mmW can extend down to 3 GHz frequencies with a wavelength of 100 mm. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, which is also referred to as centimeter waves. The frequency range bands include frequency range 1 (FR1), which includes frequency bands below 7.225 GHz, and frequency range 2 (FR2), which includes frequency bands above 24.250 GHz. Communications using mmW / near mmW radio frequency (RF) bands (e.g., 3 GHz–300 GHz) have extremely high path loss and short range. The base station / UE may operate within one or more frequency range bands. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range. The base station 180 and the UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate beamforming.

[0036] Base station 180 may transmit beamformed signals to UE 104 in one or more transmit directions 182'. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 182". UE 104 may also transmit beamformed signals to base station 180 in one or more transmit directions. Base station 180 may receive beamformed signals from UE 104 in one or more receive directions. 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 of base station 180 may be the same or may be different. The transmit direction and receive direction of UE 104 may be the same or may be different.

[0037] The 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. The MME 162 may be in communication with a home subscriber server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. In general, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are delivered through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation and other functions. The PDN gateway 172 and the BM-SC 170 are connected to IP services 176. The IP services 176 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, 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 traffic to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area that broadcasts a specific service, and may be responsible for session management (start / stop) and for collecting eMBMS-related charging information.

[0038] 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 be in communication 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. In general, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are delivered through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to an IP service 197. The IP service 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a packet switching (PS) streaming (PSS) service, and / or other IP services.

[0039] A base station may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmission reception point (TRP), or some other suitable term. The base station 102 provides an access point to the EPC 160 or the core network 190 for the UE 104. Examples of UE 104 include a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a tablet device, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a health care device, an implant, a sensor / actuator, a display, or any other similar functional device. Some UEs 104 may be referred to as IoT devices (e.g., parking meters, gas pumps, ovens, vehicles, heart monitors, 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 suitable terminology.

[0040] Refer again Figure 1In certain aspects, the UE 104 and the base station 180 may each include a beam prioritization component 198. The beam prioritization component 198 may be configured to determine a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a different parameter design than the first cell, or asynchronous timing relative to the first cell. The beam prioritization component 198 may be configured to apply a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell that carries information in a separate beam. The beam prioritization component 198 may be configured to transmit information to or receive information from another wireless device (e.g., the other of the UE and the base station) based on the selected beam. Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar fields, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0041] Figure 2A 200 is a diagram illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2B FIG230 is a diagram illustrating an example of DL channels within a 5G / NR subframe. Figure 2C 250 is a diagram illustrating an example of a second subframe within a 5G / NR frame structure. Figure 2D 280 is a diagram illustrating an example of an UL channel within a 5G / NR subframe. The 5G / NR frame structure can be frequency division duplex (FDD), where 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), where 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 (mostly DL) and subframe 3 is configured with slot format 34 (mostly UL), where D is DL, U is UL, and F is for flexible use between DL / UL. Although subframes 3 and 4 are shown as having slot formats 34 and 28, respectively, any particular subframe may 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 mixture of DL, UL, and flexible symbols. The UE is configured with a slot format (dynamically configured by DL control information (DCI) or semi-statically / statically configured by radio resource control (RRC) signaling) through the received slot format indicator (SFI). Note that the following description also applies to the 5G / NR frame structure for TDD.

[0042] 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, and 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 is based on the time slot configuration and parameter design. For slot configuration 0, different parameter designs μ0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For slot configuration 1, different parameter designs 0 to 2 allow 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and parameter design μ, there are 14 symbols per slot and 2 per subframe. μ time slots. The subcarrier spacing and symbol length / duration vary depending on parameter design. The subcarrier spacing can be equal to 2 μ *15kHz, where μ is parameter design 0 to 4. Thus, parameter design μ=0 has a subcarrier spacing of 15kHz, while parameter design μ=4 has a subcarrier spacing of 240kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A-2D An example of a slot configuration 0 with 14 symbols per slot and a parameter design μ=2 with 4 slots per subframe is provided. 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 2B). Each BWP may have a specific parameter design.

[0043] A resource grid may be used to represent the frame structure. Each slot includes a resource block (RB) (also called a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a number of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0044] like Figure 2A As explained in the illustration, some REs carry reference (pilot) signals (RS) for UEs. RSs may include demodulation RSs (DM-RSs) for channel estimation at the UE (indicated as R for a particular configuration). x, where 100x is the port number, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS). RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0045] Figure 2B An example of various DL channels within a subframe of a frame is illustrated. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including 9 RE groups (REGs), each REG including 4 consecutive REs in an OFDM symbol. The PDCCH within a BWP may be referred to as a control resource set (CORESET). Additional BWPs may be located at higher and / or lower frequencies across the channel bandwidth. The primary synchronization signal (PSS) may be within symbol 2 of a particular subframe of a frame. The PSS is used by the UE 104 to determine subframe / symbol timing and physical layer identity. The secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of a 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 may determine the physical cell identifier (PCI). Based on the PCI, the UE may determine the location of the aforementioned DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth, and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted over the PBCH (such as the system information block (SIB)), and paging messages.

[0046] As in Figure 2C As explained in , some 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 transmit 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 transmitted in the first or first two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short PUCCH or a long PUCCH is transmitted and on the specific PUCCH format used. The UE may transmit a sounding reference signal (SRS). The SRS may be transmitted in the last symbol of the subframe. The SRS may have a comb structure, and the UE may transmit the SRS on one of the comb teeth. The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0047] Figure 2D An example of various UL channels within a subframe of an illustration frame. The PUCCH may be located at a position 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 a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0048] Figure 3 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a media access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting 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 of UE measurement reports; PDCP layer functionality associated with header compression / decompression, security (ciphering, cipher decryption, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with delivery of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with 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.

[0049] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, including the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) encoding / decoding of the transport 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 may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time domain 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 coding and modulation schemes and for spatial processing. The channel estimates may be derived from reference signals 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.

[0050] At the UE 350, each receiver 354RX receives a signal through its corresponding 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 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for the UE 350. If there are multiple spatial streams destined for the UE 350, they can be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then transforms 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 on each subcarrier, as well as the reference signal, are recovered and demodulated by determining the signal constellation point most likely transmitted by the base station 310. These soft decisions can be based on the channel estimates calculated by the channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the data and control signals originally transmitted on the physical channel by the base station 310. These data and control signals are then provided to the controller / processor 359 which implements layer 3 and layer 2 functionality.

[0051] 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 channels and logical channels, packet reassembly, cipher interpretation, 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.

[0052] Similar to the functionality described in conjunction with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with delivery 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 functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto TBs, demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0053] Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by a TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0054] UL transmissions are processed at the base station 310 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 a RX processor 370.

[0055] 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 channels and logical channels, packet reassembly, cipher decoding, header decompression, control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0056] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The beam prioritization component 198 combines various aspects.

[0057] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform operations related to Figure 1 The beam prioritization component 198 combines various aspects.

[0058] In carrier aggregation (CA), two or more component carriers may be aggregated to support a wider transmission bandwidth. Each component carrier is associated with a serving cell (eg, a primary cell or a secondary cell). Figure 4 An example 400 of a serving cell 401 is illustrated, which includes coverage of a primary cell 406 and coverage of a secondary cell 408, in which one or more base stations 402 can communicate with a UE 404. The primary cell 406 is served by a primary component carrier (PCC), which the base station 402 can use to signal control and user data to the UE 404. The secondary cell 408 is served by a secondary component carrier (SCC), which the base station 402 can use to signal user data to the UE 404 in additional radio resources. Although Figure 4 Only a single secondary cell 408 is illustrated, but multiple component carriers / secondary cells may be configured for communication between the base station 402 and the UE 404 .

[0059] As UE 404 moves relative to base station 402, the UE may be better served by different base stations 410 in different serving cells 412 (which may include its own primary cell and secondary cell). Thus, a handover from a source base station (e.g., base station 402) currently serving the UE to other base stations (e.g., a target base station (e.g., base station 410)) may be performed. In order to reduce the handover interruption latency, a connect-before-break (MBB) handover may be utilized. In the case of MBB handover, when the source base station sends a handover command including an MBB handover indication (RRC connection reconfiguration message with mobility control information) to the UE, the UE will continue to use a protocol stack associated with the source base station to maintain an active connection with the source base station. The UE may configure another protocol stack with the target base station configuration and perform a handover to the target base station. During the handover execution period, the UE may use different RF chains to have simultaneous data downlink and uplink communications with both the source base station and the target base station.

[0060] Figure 5 An MBB handover (MBB HO) procedure 500 for a UE from a source base station to a target base station is illustrated. The communication flow may correspond to an inter-radio access technology (RAT) handover based on a dual active stack, which enables the UE to have simultaneous active data transfer with the source base station and with the target base station during the handover execution procedure. For example, the RAT may include NR. For example, the source base station and the target base station may each include a gNB. The distributed unit (DU) of the source base station and the DU of the target base station may be connected to a common central unit (CU). The base stations may be connected to the same core network, for example, a 5G core network (such as a combined Figure 1 Core network 190 described).

[0061] In one aspect, MBB HO may occur between a source base station and a target base station in different secondary cell groups (SCGs), where the source base station is in a source SCG and the target base station is in a target SCG. Alternatively, the source base station and the target base station may be in different primary cell groups (MCGs). For example, a UE with dual connectivity (DC) capability may communicate with different base stations that separately control the MCG and the SCG. In millimeter wave (mmW) frequencies (e.g., above 6 GHz or FR2) where limited coverage scenarios may occur, the UE may need to switch from a source SCG to a target SCG. The source SCG and the target SCG may be managed by different gNB DUs that are controlled under the same gNB CU. Each SCG may include a primary secondary cell group cell (PSCell) and optionally one or more secondary cells (SCells).

[0062] Accordingly, Figure 5MBB HO between a source base station and a target base station in different SCGs is illustrated. The source base station may correspond to a source base station 402 in a first cell 406 or 408, and the target base station may correspond to a target base station 410 in a second cell 412, as shown in FIG. Figure 4 As explained in . In some aspects, a handover event may be triggered when the UE is connected to the source base station, causing the UE to communicate a measurement report with the gNB-CU. For example, in step 1, the measurement report may indicate to the gNB-CU that the UE initiated an MBB HO. Accordingly, the gNB-CU may make an SCG change decision in response to receiving the measurement report. The gNB-CU and the target base station may then implement handover signaling. For example, in step 2, the gNB-CU and the target gNB-DU may generate a UE context setup request / response.

[0063] The gNB-CU may then transmit a reconfiguration message to the UE, such as a target SCG connection setup message. For example, in step 3, the gNB-CU may transmit an RRC reconfiguration to the UE. For example, the RRC reconfiguration message may include cell group configuration (reconfiguration with synchronization) information together with an indication that the UE is to initiate an MBB HO procedure. Upon receiving the RRC reconfiguration message, the UE may maintain connection with both the source cell and the target cell until the handover is complete. For example, in step 4a, the UE may continue data transmission and reception on the source gNB-DU. Packet data may be exchanged between the UE and the source base station and between the source base station and the UPF.

[0064] The UE may connect to the target base station by switching RACH procedures. For example, in step 4b, the UE may connect to the target gNB-DU (including synchronization and RACH on the PSCell in the target SCG). The UE may then transmit an RRC Connection Reconfiguration Complete message to the target base station. For example, upon connecting to the target gNB-DU, in step 5, the UE may transmit an RRC Connection Reconfiguration Complete message to the gNB-CU. Packet data may then be exchanged between the UE and the target base station. Upon receiving the RRC Connection Reconfiguration Complete message, the gNB-CU may determine the source gNB-DU release decision.

[0065] The UE may maintain connections to both the source base station and the target base station (in the source SCG and the target SCG) and may receive from and transmit to both base stations for a period of time during the handover procedure. In MBB HO, the UE may maintain connections to the source base station and the target base station from the time the UE receives the RRC connection reconfiguration message until the UE releases the connection with the source base station. For example, in step 6, the source gNB-DU, the target gNB-DU, and the gNB-CU may determine a UE context modification request / response for the source gNB-DU, and in step 7, the gNB-CU may transmit an RRC reconfiguration message to release the source gNB-DU cell group. Upon receiving the RRC reconfiguration message, the UE may release the connection to the source gNB. For example, in step 8, the UE may transmit an RRC reconfiguration complete message to the gNB-CU, and in step 9, the gNB-CU and the target gNB-DU determine the UE context release with the source gNB-DU. Once the UE releases the connection with the source base station, the UE may communicate only with the target base station.

[0066] When a UE is simultaneously connected to multiple cells (e.g., in carrier aggregation, or during MBB SCG HO as described above), the UE may simultaneously receive downlink signals from base stations in the multiple cells in separate beams, and the UE may simultaneously transmit uplink signals to base stations in the multiple cells in separate beams. For example, physical downlink control channel (PDCCH) monitoring opportunities may overlap in different cells, and thus the UE may simultaneously receive control information from multiple cells in different beams (e.g., with different quasi-co-location (QCL) parameters). Similarly, the UE may receive data from multiple cells in different default physical downlink shared channel (PDSCH) beams that overlap in time, receive information (e.g., reference signals (RS)) from multiple cells in different downlink beams in other downlink channels that overlap in time, or transmit information (e.g., RS) to multiple cells in different uplink beams in uplink channels that overlap in time.

[0067] In such a scenario, the UE and the base station(s) may prioritize beams of the plurality of cells according to one or more beam prioritization rules (e.g., QCL prioritization rules), and may determine which beam corresponding to one of the cells to receive or transmit. In one example rule, if the UE simultaneously receives information from a first cell carried in a first downlink channel and information from a second cell in a second downlink channel, the UE and the base station(s) may determine that the information carried in the first downlink channel (or the first downlink channel itself) has a higher priority than the information carried in the second downlink channel (or the second downlink channel itself). The UE and the base station(s) may then select the beam(s) from the cell corresponding to the higher priority information / channel. Such downlink channels or information may include, for example, PDCCH, PDSCH, CSI-RS with on or off repetition, CSI-RS for CSI reporting, periodic / semi-persistent / aperiodic (P / SP / AP) CSI-RS, and synchronization signal blocks (SSBs). In another example rule, the UE and the base station(s) may determine that the first cell has a higher priority than the second cell. For example, the UE and the base station(s) may determine that the downlink channel / information from the target cell has a higher priority than the channel / message from the source cell, and thus may select the beam(s) from the target cell. In yet another example rule, the base station (e.g., gNB-CU) may configure different cells (e.g., source SCGPSCell and target SCGPSCell) to transmit information / downlink channels on the same beam (e.g., with the same QCL parameters). The UE and the base station(s) may prioritize beams used for uplink channels or information carried by uplink channels similarly as described above. Such uplink channels or information may include a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), and a sounding reference signal (SRS).

[0068] The above examples are not intended to be limiting.The UE and base station(s) may determine the beam(s) corresponding to one of the cells to receive or transmit information according to other beam prioritization rules. For example, the UE may monitor each PDCCH candidate in each CORESET of different cellular cells, and the UE and (these) base stations may determine the beam to receive / transmit the selected CORESET based on any combination of the following rules: a CORESET configured for a common search space (CSS) may have a higher priority than a CORESET used for a user-specific search space (USS), or vice versa; for the same synchronization signal block (SS) type, a CORESET configured for a cellular cell with a lower cellular cell ID may have a higher priority than a CORESET used for a cellular cell with a higher cellular cell ID, or vice versa; for the same SS type or cellular cell ID, a CORESET configured for an SS with a lower SSID may have a higher priority than a CORESET used for an SS with a higher SSID, or vice versa; or a CORESET configured for a target cellular cell may have a higher priority than a CORESET used for a source cellular cell, or vice versa. In another example, the UE and the base station(s) may determine a default PDSCH beam to receive / transmit for receiving / transmitting PDSCH when the scheduling offset is below the beam switching wait time threshold according to any of the following rules: a single default PDSCH beam corresponding to one cell (e.g., source cell or target cell), a single default PDSCH beam corresponding to each cell (e.g., default beam switching between two cells), two simultaneously received PDSCH beams corresponding to two cells, or a preconfigured default PDSCH beam pattern. The UE and the base station(s) may similarly prioritize beams in other ways when the UE is simultaneously connected to cells of different SCGs.

[0069] The UE and base station(s) may prioritize / select each beam according to any beam prioritization rules as described above on a per-symbol basis (i.e., when the device monitors each symbol of each cell). For example, the UE and base station(s) may prioritize beams that are simultaneously received or transmitted associated with multiple cells (e.g., in carrier aggregation or MBB SCG HO), and may select different beams at each symbol accordingly. However, the above examples assume that different cells are synchronized and have the same parameter design (e.g., their symbols have the same duration and their symbol boundaries are aligned in time). When different cells have different parameter designs or are asynchronous in time, their symbol durations may be different or their symbol boundaries may not be aligned. As an example, when a UE is undergoing an MBB handover from a source SCG cell to a target SCG with a different parameter design, the UE may simultaneously receive partially overlapping PDCCH monitoring opportunities due to the different symbol durations of each downlink channel. Similarly, when a UE is simultaneously connected to asynchronous cells, the UE may receive information from or transmit information to different cells on channels with misaligned symbol or slot boundary timing.

[0070] Figure 6 An example diagram 600 is illustrated in which a UE 604 is undergoing an MBB handover from a source base station 602 in a first cell 606 (eg, in one SCG) to a target base station 608 in a second cell 610 (eg, in another SCG). Figure 6Two example cell configurations for a first cell and a second cell are depicted. In a first cell configuration 612, the first cell 606 and the second cell 610 may include different parameter designs. For example, the base station 602 in the first cell 606 may be configured with a 15kHz subcarrier spacing, while the base station 608 in the second cell 610 may be configured with a 30KHz subcarrier spacing. Thus, the duration of each symbol 616 of the first cell may be longer than the duration of each symbol 618 of the second cell. In other examples, the duration of each symbol of the first cell may be shorter than the duration of each symbol of the second cell. In a second cell configuration 614, the first cell 606 and the second cell 610 may be asynchronous with respect to each other. For example, the timing of each symbol 620 of the first cell may be offset from the timing of each symbol 622 of the second cell. Thus, the symbol boundaries 624 of each symbol 620, 622 may not be aligned in time. Although these examples are explained with reference to MBB HO where the UE is simultaneously connected to different base stations in the first cell 606 and the second cell 610, it should be understood that these examples may also occur with reference to carrier aggregation where the UE is simultaneously connected to different cells 606, 610 served by the same base station.

[0071] Various aspects presented herein provide a beam prioritization rule that addresses the following issues: Figure 6 . For example, when the cells 606, 610 have different parameter designs, it may not be clear that the UE 604 and the base station(s) 602 and / or 608 may determine on a per-symbol basis that a beam has priority based on a cell with a shorter symbol duration 618 or a cell with a longer symbol duration 616. Similarly, when the cells 606, 610 are asynchronous with respect to each other and have misaligned symbol boundaries 624, it may not be clear which cell is used as a timing reference for the UE 604 and the base station(s) to determine a priority beam on a per-symbol basis. Therefore, various aspects presented herein enable the UE and the base station(s) to use the cell as a reference when prioritizing beams received from or transmitted to cells having different parameter designs or being asynchronous with respect to each other.

[0072] The present disclosure allows UE and (its) base stations to prioritize beams simultaneously received from or transmitted to cells with different parameter designs or asynchronous to each other according to various aspects. In this way, simultaneous beam conflict resolution for cells with different parameter designs or asynchronous to each other can be improved. In one aspect where the UE is simultaneously connected to multiple cells with different parameter designs, the UE and (its) base stations may apply beam prioritization rules to determine the beam of one of the cells on a per-symbol basis relative to a preconfigured cell (e.g., a source cell, a target cell, a cell with a longer symbol duration, or a cell with a shorter symbol duration) or relative to an indicated cell (e.g., a cell indicated in a radio resource control (RRC) message or a media access control (MAC) control element (MAC-CE) from one of the cells (e.g., a source cell). In one example, the UE and (its) base stations may apply beam prioritization rules to determine beams based on cells with shorter symbol durations. Thus, with reference to Figure 6 , when the first cell 606 has a longer symbol duration than the second cell 610 (e.g., the duration of symbol 616 is twice the duration of symbol 618), the UE 604 and the base stations 602, 608 may determine at each symbol of the second cell 610 to receive / transmit a beam from one of the first cell 606 or the second cell 610. As a result, within each symbol of the first cell, the prioritized beam may change from one cell to another. In another example, the UE and the base stations may apply a beam prioritization rule to determine beams based on cells with longer symbol durations. Thus, with reference to Figure 6, the UE 604 and the base station(s) 602, 608 may determine at each symbol of the first cell 606 to receive / transmit a beam from the first cell 606 or one of the second cells 610. As a result, within each symbol of the first cell, the UE and the base station(s) cannot change or re-determine the prioritized beam. The cells 606, 610 may be at a higher frequency range (e.g., above 6 GHz) and may be a source cell and a target cell during handover or a primary cell and a secondary cell in carrier aggregation. In either example, the UE and the base station(s) may apply the beam prioritization rule to the simultaneously received / transmitted PDCCH beams, the default PDSCH beams, other downlink channel beams containing RSs (e.g., a first RS such as a CSI-RS), and / or uplink channel beams containing RSs (e.g., a second RS such as an SRS) to determine which beam to receive from or transmit to one of the cells 606, 610.

[0073] In another aspect where the UE is simultaneously connected to multiple cells that are asynchronous with respect to each other, the UE and the base station(s) may apply beam prioritization rules to determine the beam of one of the cells on a per-symbol boundary basis relative to a fixed preconfigured cell (e.g., a source cell, a target cell, a cell with a longer symbol duration, or a cell with a shorter symbol duration) or relative to a fixed indicated cell (e.g., a cell indicated in an RRC message or MAC-CE from one of the cells (e.g., the source cell). For example, referring to Figure 6, when the symbol 620 of the first cell 606 is offset relative to the symbol 622 of the second cell 610 and the fixed cell is preconfigured or indicated as the second cell 610, the UE 604 and the base station(s) 602, 608 may determine to receive / transmit a beam from one of the first cell 606 or the second cell 610 at each symbol boundary 624 of the second cell 610. Similarly, if the fixed cell is preconfigured or indicated as the first cell 606, the UE 604 and the base station(s) 602, 608 may determine to receive / transmit a beam from one of the first cell 606 or the second cell 610 at each symbol boundary 626 of the first cell 606. In another aspect, the UE and the base station(s) may apply a beam prioritization rule to determine beams on a per-symbol boundary basis relative to the cell from which the most recent downlink communication was received or to which the most recent uplink communication was transmitted. For example, if the UE and the base station(s) originally determined to receive or transmit beams at each symbol boundary 624 of the second cell 610, but then receive or transmit in the first cell 606 based on the beam priority rule described above (e.g., the downlink channel of the first cell is determined to have a higher priority than the downlink channel of the second cell), the UE and the base station(s) then determine to receive / transmit beams at each symbol boundary 626 of the first cell 606. In yet another aspect, the UE and the base station(s) may refrain from applying the beam prioritization rule to determine beams during partial symbols resulting from misaligned symbol boundaries. For example, if the UE and the base station(s) switch from determining beams at each symbol boundary 624 to determining beams at each symbol boundary 626 as described above, the UE and the base station(s) may refrain from determining new beams during partial symbols 628 resulting from switching from misaligned symbol boundaries.

[0074] In an additional aspect, although from the perspective of the UE the UE may receive beams from or transmit beams to the first cell and the second cell simultaneously, and thus apply the beam prioritization rules as described above to determine which beam to select at each symbol or symbol boundary, from the perspective of the base station the timing may be different due to propagation delay. For example, referring to Figure 6, although the UE 604 may receive downlink information from the base station 602 in the first cell 606 and the base station 608 in the second cell 610 at the same time, the base stations 602 and 608 may not transmit the downlink information at the same time (for example, the base station 608 may be farther from the UE 604 than the base station 602, resulting in a larger propagation delay for the transmission). Therefore, each base station may not be aware of the conflict of simultaneous receive beams at the UE. Similarly, due to the propagation delay, each base station may not be aware that the simultaneous transmit beams conflict with the uplink from the UE. Accordingly, when the UE determines to receive a beam from (or transmit a beam to) one of the first cell or the second cell as described above, the UE may further transmit to the base station 602 and / or 608 the timing difference between the time when the beam is received from the first cell and the second cell or the time when the beam is transmitted to the first cell and the second cell. The base station(s) may then determine the beam that was successfully (or unsuccessfully) transmitted / received based on the timing difference. For example, if base stations 602, 608 transmit their beams at symbol 0 and symbol 1, respectively, and the UE receives both beams at symbol 5 (due to a propagation delay difference of 1 symbol between the base stations), the UE may apply a beam prioritization rule to determine that it is to receive the beam from only one of the two base stations. If the UE determines that it is to receive the beam from base station 608, for example, the UE may transmit the timing difference (e.g., a propagation delay difference of 1 symbol) to base station 602, thereby indicating to base station 602 that there is a beam conflict within 1 symbol of the transmission of base station 608. Base station 602 may then determine that its beam was not successfully transmitted (e.g., time overlap occurred) and accordingly retransmit additional symbols, for example, after base station 608 in an attempt to minimize the beam conflict. For example, when the base station determines that time overlap occurred (e.g., based on the received timing difference), base station 602 may apply a beam prioritization rule to select a beam (e.g., a beam that was not successfully transmitted) and accordingly retransmit the selected beam.

[0075] When a UE is simultaneously connected to two cells and the UE and the base station(s) determine the beam of one of the cells on a per-symbol or per-symbol boundary basis based on the above-described beam prioritization rules as described above, the UE may switch from one cell to another in the middle of a transmission. For example, a continuous transmission of a certain number of symbols from the first cell 606 across the determined cells (e.g., cells with shorter symbol durations, etc.) may be interrupted if the second cell 610 is determined to be a beam with a higher priority during one of those symbols or symbol boundaries. Thus, in an alternative aspect, the UE and the base station(s) may apply the beam prioritization rules to determine the beams only after completing reception or transmission of continuous transmissions with the same known beam indication. For example, when the UE 604 and the base station 602 receive / transmit a beam including a first transmission spanning multiple symbols from the first cell 606, the UE 604 and the base station 602 will determine to continue receiving / transmitting the same beam from the first cell 606 until the first transmission is completed, even if the UE 604 receives a second transmission from the second cell 610 (which may have a higher priority than the first cell) during one of the symbols of the first transmission. In other words, after the UE and the base station(s) determine the beam based on the above beam prioritization rules as described above, the UE and the base station(s) will refrain from applying these rules (e.g., determining a new beam or changing the beam) during the continuous transmission until the transmission has been completed. Such continuous transmissions with the same known beam indication may include, for example, a control resource set (CORESET) or synchronization signal block (SSB) associated with a potential PDCCH transmission, a downlink signal associated with a TCI state previously decoded by the UE, or an uplink signal associated with a spatial relationship previously decoded by the UE.

[0076] Although the above examples refer to scenarios where a UE is simultaneously connected to multiple cells, in alternatives of the present disclosure, the UE may be restricted from being simultaneously connected to cells with different symbol durations or misaligned symbol boundaries and beam-based transmissions. The base station may indicate the presence of beam-based transmissions for downlink communications based on a transmission configuration indication (TCI) state indicating a QCL-Type D attribute (e.g., indicating that RS transmissions of multiple cells have similar spatial receive (Rx) parameters), or may indicate the presence of beam-based transmissions for uplink based on a spatial relationship (e.g., indicating that RS transmissions of multiple cells have a spatial relationship with a PUCCH). The cells may be in a higher frequency range (e.g., above 6 GHz) and may be a source cell and a target cell during a handover.

[0077] For example, during handover, the beam prioritization rules may cause the UE to refrain (or the base station may prevent the UE) from simultaneously connecting to multiple cells associated with beam-based transmissions and having different parameter designs or being asynchronous with each other. In other words, the UE may be restricted from performing MBB handovers and only allowed to perform break-before-make (BBM) handovers in which the connection to the source cell is released before the connection to the target cell. As an example, refer to Figure 6 , when the UE 604 is connected to the source base station 602 and is requesting a handover to the target base station 608, the UE may apply beam prioritization rules to determine whether the two cells 606, 610 include beam-based transmissions (e.g., based on TCI status) and have different parameter designs or are asynchronous in time. Figure 5 When sending the measurement report in step 1 of , the UE may only request BBM switching. Alternatively, the base station (602, 608) rather than the UE may determine whether the two cells 606, 610 include beam-based transmission and have different parameter designs or are asynchronous in time. In such a case, even if the UE requests MBB switching, the base station may only allow BBM switching based on the determination.

[0078] Figure 7 An example call flow diagram 700 is illustrated between a UE 702 and one or more base stations 704, 706, 708 in one or more serving cells. Figure 7 In the example of FIG. 7 , UE 702 is requesting to undergo an MBB handover from source base station 704 to target base station 706 in a different SCG (as described above in Figure 5 ), the source base station 704 and the target base station 706 are distributed units (DUs) sharing a common central unit (CU) base station 708. Thus, reference Figure 5 and Figure 6 , UE 702 may correspond to UE 604, source base station 704 may correspond to base station 602 or source gNB-DU in first cell 606, target base station 706 may correspond to base station 608 or target gNB-DU in second cell 610, and CU base station 708 may correspond to gNB-CU. In other examples, UE 702 may be simultaneously connected to different cells of one or more base stations 704, 706 in carrier aggregation (e.g., Figure 4 Therefore, refer to Figure 4, UE 702 may correspond to UE 404, base station 704 may correspond to base station 402 in primary cell 406, and base station 706 may correspond to base station 402 in secondary cell 408. Alternatively, base station 704 may correspond to base station 402 in serving cell 401, and base station 706 may correspond to base station 410 in cell 412. In the above examples, the first cell and the second cell have different parameter designs or are asynchronous with each other.

[0079] In one example where the UE is undergoing MBB SCG handover, the UE 702 may first transmit a request 710 to the CU base station 708 for handover from the source base station 704 to the target base station 706, as described above with reference to Figure 5 as described. In one aspect, the CU base station 708 may determine that the first cell and the second cell have beam-based transmissions and have different parameter designs or are asynchronous with each other, and based on the determination, the UE may be restricted 712 from being connected to both the source base station 704 and the target base station 706 at the same time. For example, during the handover, the base station 708 may prevent the UE 702 from being simultaneously connected to multiple cells associated with beam-based transmissions and having different parameter designs or being asynchronous with each other. In other words, the UE may be restricted from performing an MBB handover and may only be allowed a break-before-make (BBM) handover in which the connection with the source base station 704 is released before connecting to the target base station 706. The CU base station 708 may send a BBM handover connection setup message to the UE 702 accordingly. Otherwise, if the CU base station 708 allows the UE to be connected to both the source base station 704 and the target base station 706 at the same time, the CU base station 708 may send an MBB handover connection setup message to the UE 702, as described above. Figure 5 For example, the handover connection setup message 714 may be in Figure 5 The RRC reconfiguration message described in step 3.

[0080] When the UE 702 is simultaneously connected to both the source base station 704 and the target base station 706 during MBB handover or when the UE is simultaneously connected to multiple cells of the base station 704 and / or 706 in carrier aggregation, the UE may determine a time overlap 716 between signals received from the base stations 704, 706 in separate beams from the first cell and the second cell. For example, the UE 702 may receive information 720 (e.g., SSB, CORESET, PDCCH, PDSCH, RS, etc.) of the first cell from the base station 704 on the first beam 718, and the UE 702 may simultaneously receive information 724 (e.g., SSB, CORESET, PDCCH, PDSCH, RS, etc.) of the second cell from the base station 706 on the second beam 722.

[0081] As a result of the collision from the simultaneous beam reception, the UE 702 applies a beam prioritization rule 726 to identify or select a beam from the beams 718, 722 associated with the downlink channel carrying the information 720, 724 from one of the first cell or the second cell. In one example, the UE may select the beam 726 based on the above beam prioritization rule on a per-symbol basis with respect to the preconfigured cell or with respect to the indicated cell, as described above with reference to Figure 6 As described. For example, the source base station 704 may transmit a message 728 (e.g., RRC or MAC-CE) to the UE 702 to indicate that the above-described beam prioritization rule should be applied to each symbol associated with the first cell (the source cell). Thus, the UE may determine to select 726 a beam from the source cell (e.g., beam 718) or a beam of the target cell (e.g., beam 722) during each symbol of the source cell. For example, the UE may determine at the beginning of each symbol of the source cell whether beam 718 or 722 is a higher priority beam (based on the beam prioritization rule) and select the higher priority beam during the symbol accordingly.

[0082] In another example, the UE may identify or select a beam 726 based on the above-described beam prioritization rules on a per-symbol boundary basis relative to a fixed preconfigured or indicated cell or relative to a cell from which a most recent downlink communication was received or to which a most recent uplink communication was transmitted. Figure 7 As shown, information 724 may be received at least one symbol later than information 720 but while information 720 is still being transmitted. Thus, the UE may determine to select 726 a beam from the source cell (e.g., beam 718) or a beam of the target cell (e.g., beam 722) during each symbol boundary of the target cell (because the most recent / current communication (e.g., information 724) originates from that cell). For example, the UE may determine at the beginning of each symbol boundary of the target cell whether beam 718 or 722 is a higher priority beam (based on the beam prioritization rule) and accordingly select the higher priority beam during that symbol until the next symbol boundary. Furthermore, if the higher priority beam is associated with a cell with a longer symbol duration (e.g., due to different parameter designs), the beam may also have a higher priority at each symbol boundary of a cell with a shorter symbol duration (falling within each longer symbol).

[0083] In yet another example, the UE may select beam 726 based on the above beam prioritization rules after completing consecutive transmissions with the same known beam indication. Figure 7As shown, information 724 may be received at least one symbol later than information 720 but while information 720 is still being continuously transmitted. Thus, the UE may determine to select 726 a beam from a source cell (e.g., beam 718) or a beam from a target cell (e.g., beam 722) only after completing reception of information 720, and may similarly refrain from making a beam selection in a transitional phase.

[0084] Once the UE 702 applies the beam prioritization rules to make a beam selection, the UE receives downlink information 730 (e.g., information 720 or 724) from the first cell or the second cell associated with the selected beam. For example, after the UE receives information on beams 718 and 722 simultaneously, the UE may determine that beam selection should be performed at each symbol of the source cell based on message 728, based on symbol duration, etc. After the UE determines when to make a beam selection, the UE selects one of the beams 718, 722 based on the beam prioritization rules described above. For example, at the next symbol of the source cell, the UE 702 may determine that the target cell has a higher priority than the source cell and therefore determine to select beam 722 carrying information 724 and discard beam 718 carrying information 720. However, since the base stations 704, 706, 708 (e.g., due to different propagation delays of beams 718 and 722) may not be aware of the simultaneous beam reception collision, the UE 702 may optionally transmit to one of the base stations (e.g., the CU base station 708) a timing difference 732 between receiving the information from the first cell on beam 718 and receiving the information from the second cell on beam 722. Based on the timing difference, at 734, the base station 708 may determine which beam 718, 722 was successfully transmitted to the UE 702. For example, the base station 708 may determine from the timing difference 732 that the source base station's transmission of the information 720 was discarded despite the source base station 704 transmitting one symbol earlier than the target base station 706, and therefore the base station 708 may notify the source base station 704 that a retransmission of the information 720 is to be performed.

[0085] At 736, the UE 702 may also transmit uplink communications based on the selected beam. For example, when the UE selects a beam 726 associated with one of the downlink information 720 or 724 as described above, the UE may transmit uplink information 738, 740, 742 (e.g., PUCCH, PUSCH, SRS, etc.) to any of the base stations 704, 706, 708 using corresponding beams 744, 746, 748 that are spatially related to the selected beam 726. The UE 702 may thus select a beam for an uplink channel when selecting a beam for a downlink channel. The UE may select an uplink beam by applying the above beam prioritization rules on a per-symbol, per-symbol boundary, or continuous transmission basis as described above. The UE may also feed back the timing difference between transmitting information corresponding to the first cell on beam 744 and transmitting information corresponding to the second cell on beam 746 to one of the base stations (e.g., CU base station 708) so that the base station may similarly determine which beam 718, 722 is successfully transmitted to UE 702.

[0086] Figure 8 800 is a flow chart of a method of wireless communication. The method may be performed by a first wireless device, such as a UE (e.g., UE 104, 404, 604, 702; device 902 / 902'; processing system 1014, which may include memory 360 and may be the entire UE 350 or a component of the UE 350, such as TX processor 368, RX processor 356 and / or controller / processor 359) or a component of a UE. Optional aspects are illustrated with dashed lines. The method may enable a first wireless device, such as a UE, to determine beam prioritization for receiving or transmitting communications with a first cell and / or a second cell having different parameter designs or asynchronous timing.

[0087] At 802, a first wireless device determines a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a different parameter design than the first cell, or asynchronous timing relative to the first cell. The overlap may be caused by, for example, Fig. 9 The first signal and the second signal may each include a channel and a reference signal. The first signal and the second signal may both include downlink signals or both include uplink signals. The first cell and the second cell may be in different SCGs. The first cell and the second cell may be in different MCGs. The first cell and the second cell may be in a frequency range of at least 6 GHz, and the first wireless device may be simultaneously connected to the first cell and the second cell during a make-before-break handover. For example, reference Figure 7, UE 702 may determine a time overlap 716 between downlink signals including information 720, 724. Information 720, 724 may include PDCCH, PDSCH, CSI-RS, etc. The UE may also determine a time overlap between uplink signals (e.g., including information 738, 740). Information 738, 740 may include PUCCH, PUSCH, SRS, etc. Reference Figure 6 As part of the MBB handover of UE 604 from source base station 602 to target base station 608, the first cell may be first cell 606 and the second cell may be second cell 610. First cell 606 and second cell 610 may be in different SCGs or MCGs (as described above with reference to Figure 5 described).

[0088] At 806, the first wireless device applies a beam prioritization rule for selecting a beam associated with a first signal of the first cell or a second signal of the second cell that carries information in a separate beam. The beam prioritization rule may be, for example, Fig. 9902 of the device 906. In some aspects, the second cell may include a different parameter design than the first cell, and the beam prioritization rule applied at 806 may restrict the first wireless device from being connected to the first cell and the second cell having different parameter designs at the same time. In other aspects, the first wireless device may be connected to the first cell and the second cell, wherein the second cell includes a different parameter design than the first cell, and the beam prioritization rule may be applied during a symbol of one of the first cell or the second cell. In some aspects, the second cell may be asynchronous with the first cell, and the beam prioritization rule may restrict the first wireless device from being connected to the first cell and the second cell at the same time if the second cell is asynchronous with the first cell. In other aspects, the first wireless device may be connected to the first cell and the second cell, wherein the second cell is asynchronous with the first cell. The beam prioritization rule may be applied at a symbol boundary of one of the first cell or the second cell. One of the first cell or the second cell, whose symbol duration or boundary is applied with the beam prioritization rule, may include a source cell, a target cell, a cell with a longer symbol duration, a cell with a shorter symbol duration, or a cell identified according to one of an RRC message or a MAC-CE. If the beam prioritization rule is applied per symbol of one of the first cell or the second cell, a beam with a higher priority determined at the beginning of each symbol may be used by the first wireless device for transmission or reception during each symbol. If the beam prioritization rule is applied at each symbol boundary of one of the first cell or the second cell with a longer symbol duration, and if a beam of another cell has a higher priority at each shorter symbol boundary within the longer symbol duration, the beam of the other cell may also be used for transmission or reception at each shorter symbol boundary within the longer symbol duration. The beam prioritization rule may be applied for at least one of: a simultaneous PDCCH beam, a default PDSCH beam, a downlink channel beam including a reference signal, an uplink channel beam including a reference signal, a beam from a first cell and a second cell, or a beam to a first cell and a second cell. Figure 7 , when the cells have different parameter designs or are asynchronous with each other (e.g. Figure 6728), the UE 702 may apply beam prioritization rules 726 to determine which beam 718, 722 to receive from one of the cells served by the base station 704 or 706. The beam prioritization rules may be applied with respect to each symbol or symbol boundary of one of the first cell or the second cell (e.g., the cell that is preconfigured, indicated (e.g., indicated by the message 728), or associated with the current downlink or uplink communication). When the cells of the source base station 704 and the target base station 706 have different parameter designs or are asynchronous with respect to each other, the UE may alternatively be restricted (e.g., at 712) from being connected to the source base station 704 and the target base station 706 at the same time.

[0089] The first wireless device may be engaged in communications with a first cell or a second cell, for example, a current downlink or uplink communication. In some aspects, the first wireless device may refrain from applying beam prioritization rules on partially aligned symbols of the first cell and the second cell. The first wireless device may be connected to the first cell and the second cell, and may apply beam prioritization rules after receiving a continuous transmission with the same beam indication for one of the first cell or the second cell. The first wireless device may refrain from applying beam prioritization rules during the continuous transmission. For example, the first wireless device may determine not to change the selected beam during an ongoing continuous transmission with the same beam indication. The continuous transmission may include at least one of: a CORESET or SSB with a potential PDCCH transmission, a downlink signal associated with a decoded TCI state, or an uplink signal associated with a spatial relationship of a decoded uplink signal. For example, referring to Figure 7 , when applying beam prioritization rule 726, if beam 718 carries information 720 in a continuous transmission, UE 702 may determine to receive information 724 on beam 722 only after beam 718 has completed transmission. In other words, UE 702 may refrain from applying beam prioritization rule while continuous transmission is being received.

[0090] At 808, the first wireless device may receive downlink information from a second wireless device (e.g., a base station) based on the selected beam. The selected beam may be determined, for example, at 806. The downlink information may be provided, for example, by Fig. 9 For example, referring to the receiving component 904 of the device 902 Figure 7 , UE 702 may receive downlink information 730 from one of the first cell or the second cell based on the beam determined at 726 (eg, beams 718, 722).

[0091] At 810, the first wireless device may transmit uplink information to a second wireless device (e.g., a base station) based on the selected beam (e.g., the beam determined using the beam prioritization rule at 806). The uplink information may be transmitted, for example, by Fig. 9 For example, referring to the transmission component 906 of the device 902 Figure 7 , UE 702 may transmit uplink information 736 to one of the first cell or the second cell based on the spatial relationship to the beam determined at 726. For example, UE 702 may transmit information 738 or 740 in beam 744 or 746, respectively.

[0092] As illustrated at 804, the first wireless device may transmit a timing difference between the first cell and the second cell to a second wireless device (e.g., a base station), wherein the timing difference is for downlink communication or uplink communication. The timing difference may be transmitted, for example, by a timing difference component 912 and / or a transmission component 906 of the device 902. For example, the first wireless device may feedback the downlink and / or uplink timing difference between the two cells. The feedback of the timing difference may enable the second wireless device to determine a discarded signal from one of the two cells for the first wireless device. For example, referring to Figure 7 , UE 702 may transmit a timing difference 732 to base station 708 (and / or base stations 704 and / or 706) for the base station(s) to determine which beam 734 (e.g., beams 718, 722) was successfully transmitted to the UE. The timing difference may be, for example, a propagation delay difference between the time when information 720 is transmitted by base station 704 and received by UE 702 and the time when information 724 is transmitted by base station 706 and received by UE 702. For example, if information 720 is transmitted by base station 704 in symbol 0 and received by UE in symbol 5 and if information 724 is transmitted by base station 706 in symbol 1 and received by UE in symbol 5, the propagation delay difference or timing difference between the two cells will be 1 symbol. Similarly on the uplink, the UE may transmit to base station 708 (and / or base stations 704 and / or 706) the timing difference between the time when information 738 was transmitted by the UE and received by base station 704 and the time when information 740 was transmitted by the UE and received by base station 706.

[0093] Fig. 9900 is a conceptual data flow diagram illustrating data flow between different devices / components in an example device 902. The device can be a first wireless device, such as a UE or a component of a UE. The device includes a receiving component 904, which receives downlink communications from, for example, a second wireless device (such as a base station 950 of a first cell and / or a base station 951 of a second cell). The device includes a transmission component 906, which transmits uplink communications to the second wireless device (e.g., base stations 950 and / or 951). The device includes an overlapping component 908, which is configured to determine a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of the following: a different parameter design from the first cell, or asynchronous timing relative to the first cell, for example, as combined Figure 8 The apparatus includes a beam prioritization component 910 configured to apply a beam prioritization rule for selecting a beam associated with a first signal of a first cell or a second signal of a second cell carrying information in a separate beam, for example, as described in conjunction with Figure 8 The receiving component 904 can be configured to receive information from the second wireless device based on the selected beam, for example, as described in conjunction with Figure 8 The transmission component 906 can be configured to transmit information to the second wireless device based on the selected beam, for example, as described in conjunction with Figure 8 The device includes a timing difference component, which is configured to transmit a timing difference between the first cell and the second cell to a second wireless device (e.g., base station 950 or 951), such as in combination with Figure 8 As described in 804.

[0094] The apparatus may include executing Figure 7 and 8 The additional components of each box of the algorithm in the preceding flowchart. Thus, Figure 7 and 8 Each block in the aforementioned flow chart may be performed by a component and the device may include one or more of these components. These components 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.

[0095] Fig.101 is a diagram 1000 illustrating an example of a hardware implementation of a device 902' employing a processing system 1014. The processing system 1014 may be implemented with a bus architecture generally represented by a bus 1024. The bus 1024 may include any number of interconnecting buses and bridges, depending on the specific application and overall design constraints of the processing system 1014. The bus 1024 links various circuits together, including one or more processors and / or hardware components (represented by the processor 1004, components 904, 906, 908, 910, 912, and computer readable medium / memory 1006). The bus 1024 may also link various other circuits, such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further.

[0096] The processing system 1014 may be coupled to the transceiver 1010. The transceiver 1010 is coupled to one or more antennas 1020. The transceiver 1010 provides a means for communicating with various other devices over a transmission medium. The transceiver 1010 receives signals from the one or more antennas 1020, extracts information from the received signals, and provides the extracted information to the processing system 1014 (specifically, the receiving component 904). In addition, the transceiver 1010 receives information from the processing system 1014 (specifically, the transmitting component 906) and generates signals to be applied to the one or more antennas 1020 based on the received information. The processing system 1014 includes a processor 1004 coupled to a computer-readable medium / memory 1006. The processor 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory 1006. The software, when executed by the processor 1004, causes the processing system 1014 to perform the various functions described above for any particular device. The computer-readable medium / memory 1006 may also be used to store data manipulated by the processor 1004 when executing software. The processing system 1014 further includes at least one of components 904, 906, 908, 910, 912. These components may be software components running in the processor 1004, software components resident / stored in the computer-readable medium / memory 1006, one or more hardware components coupled to the processor 1004, or some combination thereof. The processing system 1014 may be a component of the UE 350 and may include the memory 360 and / or at least one of the following: the TX processor 368, the RX processor 356, and the controller / processor 359. Alternatively, the processing system 1014 may be the entire UE (e.g., see Figure 3 of 350).

[0097] In one configuration, an apparatus 902 / 902' for wireless communication includes: means for determining a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a different parameter design than the first cell, or asynchronous timing relative to the first cell; means for applying a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information in a separate beam. In one configuration, the apparatus may include means for receiving information from a second wireless device based on the selected beam. In one configuration, the apparatus may include means for transmitting information to the second wireless device based on the selected beam. In one configuration, the apparatus may include means for transmitting a timing difference between the first cell and the second cell to the second wireless device. The aforementioned means may be one or more of the aforementioned components of the apparatus 902 and / or the processing system 1014 of the apparatus 902' configured to perform the functions recited by the aforementioned means. As described above, the processing system 1014 may include the TX processor 368, the RX processor 356, and the controller / processor 359. As such, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the aforementioned means.

[0098] Fig.11 1100 is a flow chart of a wireless communication method. The method may be performed by a first wireless device, such as a base station or a component of a base station (e.g., base station 310, 402, 410, 602, 608, 704, 706, 708; device 1202 / 1202'; processing system 1314, which may include memory 376 and may be the entire base station 310 or a component of the base station 310, such as TX processor 316, RX processor 370 and / or controller / processor 375). Optional aspects are illustrated with dashed lines.

[0099] At 1102, a first wireless device transmits information to a second wireless device (e.g., UE) connected to a first cell and requesting a connection to a second cell. The second cell includes at least one of: a different parameter design than the first cell, or asynchronous timing with the first cell. The first cell and the second cell may be in different SCGs. The first cell and the second cell may be in different MCGs. The first cell and the second cell may be in a frequency range of at least 6 GHz, and the second wireless device may be connectable to the first cell and the second cell during a make-before-break handover. The information may be, for example, Fig.12 The information component 1208 and / or the transmission component 1206 of the device 1202 are transmitted. For example, referring to Figure 7, in an MBB handover, the first wireless device may be a base station 708 that transmits information in the form of a handover connection setup 714 to a UE 702 that is connected to a first cell served by a source base station 704 and is requesting a connection to a second cell served by a target base station 706. The base station 708 may be, for example, a gNB-CU, and the source base station and the target base station may be gNB-DUs of the base station 708. Alternatively, the first wireless device may be a base station 402, 602, or 704 that transmits information 720 to the UE 702, or a base station 410, 608, or 706 that transmits information 724 to the UE 702. Reference Figure 6 , the first cell and the second cell may correspond to the first cell 606 and the second cell 610, respectively, and may be in different SCGs or MCGs, as described above. Figure 5 Described in .

[0100] At 1106, the first wireless device may determine a beam associated with one of the first cell and the second cell that was successfully transmitted to the second wireless device (eg, UE). The beam may be, for example, Fig.12 The first wireless device may also determine the beam in response to determining a time overlap between a first signal of the first cell and a second signal of the second cell, wherein the second cell includes at least one of: a different parameter design than the first cell, or asynchronous timing relative to the first cell, such as described above in Figure 8 The first wireless device may also select a beam in response to applying a beam prioritization rule for selecting a beam associated with a first signal of a first cell or a second signal of a second cell carrying information in a separate beam, such as described above in Figure 8 806 as described. For example, reference Figure 7 , the base station 708 (or 704, 706) may determine a beam 734 that is successfully (or unsuccessfully) transmitted to the UE 702 from among the beams 718, 722 simultaneously transmitted by the source base station 704 and the target base station 706, respectively. The base station may determine the beam 734 based on the applied beam prioritization rule (e.g., at 726). The base station may also determine the beam 734 based on the timing difference 732 received from the UE 702 (from which the time overlap may be determined).

[0101] At 1108, the first wireless device may receive information from or transmit information to a second wireless device (e.g., a UE) based on the selected beam. The beam may be selected based on the application of a beam priority rule, such as in conjunction with Figure 8 806 and Fig.11 The information may be provided by, for example, Fig.12For example, referring to the beam information component 1212 of the device 1202 Figure 7 , the base stations 704, 706, 708 may receive uplink information 738, 740, 742 in beams 744, 746, 748 having a spatial relationship with the beams 718, 722 selected by the UE 702 after the UE applied the beam prioritization rule 726. Similarly, the base stations 704, 706, 708 may transmit downlink information to the UE 702 in a beam.

[0102] At 1104, the first wireless device may receive from a second wireless device (e.g., UE) a timing difference between a time when downlink information is transmitted from the first cell and the second cell and a time when uplink information is received at the first cell and the second cell. At 1106, the beam may be determined based on the timing difference. The timing difference may be, for example, determined by Fig.12 The timing difference component 1214 of the device 1202 is received. For example, referring to Figure 7 , base station 708 (and / or base stations 704 and / or 706) may receive timing difference 732 from UE 702 for the base station(s) to determine which beam 734 (e.g., beams 718, 722) was successfully transmitted to the UE. The timing difference may be, for example, a propagation delay difference between the time when information 720 is transmitted by base station 704 and received by UE 702 and the time when information 724 is transmitted by base station 706 and received by UE 702. For example, if information 720 is transmitted by base station 704 at symbol 0 and received by UE at symbol 5 and if information 724 is transmitted by base station 706 at symbol 1 and received by UE at symbol 5, the propagation delay difference or timing difference between the two cells will be 1 symbol. Similarly on the uplink, base station 708 (and / or base stations 704 and / or 706) may receive from UE 702 the timing difference between the time information 738 was transmitted by the UE and received by base station 704 and the time information 740 was transmitted by the UE and received by base station 706.

[0103] Fig.12 1200 is a conceptual data flow diagram illustrating data flow between different means / components in an example device 1202. The device can be a first wireless device, such as a base station or a component of a base station. The device includes a receiving component 1204 that receives uplink communications from a second wireless device, such as a UE 1250, and a transmitting component 1206 that transmits downlink communications to the second wireless device, such as the UE 1250. The device includes an information component 1208 that is configured to transmit information to a second wireless device, such as a UE, that is connected to a first cell and requests a connection to a second cell, such as in conjunction with Fig.11The second cell includes at least one of: a different parameter design than the first cell, or asynchronous timing relative to the first cell. The device includes a determining component 1210, the determining component 1210 is configured to determine a beam associated with one of the first cell and the second cell that is successfully transmitted to the second wireless device, such as in combination with Fig.11 The determining component 1210 may determine the beam in response to determining a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a different parameter design than the first cell, or asynchronous timing relative to the first cell, such as in conjunction with Figure 8 802 and Fig.11 The determining component 1210 may also select a beam in response to applying a beam prioritization rule for selecting a beam associated with a first signal of a first cell or a second signal of a second cell carrying information in a separate beam, for example, as described above in conjunction with Figure 8 806 and Fig.11 The device includes a beam information component 1212, which is configured to receive information from a second wireless device (e.g., UE 1250) or transmit information to a second wireless device based on the selected beam, such as in combination with Fig.11 The device includes a timing difference component 1214, which is configured to receive from the second wireless device a timing difference between the time when downlink information is transmitted from the first cell and the second cell or the time when uplink information is received at the first cell and the second cell, for example, as described in conjunction with Fig.11 As described in 1104. The beam can be determined by the determination component 1210 based on the timing difference.

[0104] The apparatus may include executing Figure 7 and 11 The additional components of each box of the algorithm in the preceding flowchart. Thus, Figure 7 and 11 Each block in the aforementioned flow chart may be performed by a component and the device may include one or more of these components. These components 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.

[0105] Fig.131300 is a diagram illustrating an example of a hardware implementation of a device 1202' employing a processing system 1314. The processing system 1314 may be implemented with a bus architecture generally represented by a bus 1324. Depending on the specific application of the processing system 1314 and the overall design constraints, the bus 1324 may include any number of interconnecting buses and bridges. The bus 1324 links various circuits together, including one or more processors and / or hardware components (represented by the processor 1304, components 1204, 1206, 1208, 1210, 1212, 1214, and computer readable medium / memory 1306). The bus 1324 may also link various other circuits, such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further.

[0106] The processing system 1314 may be coupled to the transceiver 1310. The transceiver 1310 is coupled to one or more antennas 1320. The transceiver 1310 provides a means for communicating with various other devices over a transmission medium. The transceiver 1310 receives signals from the one or more antennas 1320, extracts information from the received signals, and provides the extracted information to the processing system 1314 (specifically, the receiving component 1204). In addition, the transceiver 1310 receives information from the processing system 1314 (specifically, the transmitting component 1206) and generates signals to be applied to the one or more antennas 1320 based on the received information. The processing system 1314 includes a processor 1304 coupled to a computer-readable medium / memory 1306. The processor 1304 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory 1306. The software, when executed by the processor 1304, causes the processing system 1314 to perform the various functions described above for any particular device. The computer-readable medium / memory 1306 may also be used to store data manipulated by the processor 1304 when executing software. The processing system 1314 further includes at least one of the components 1204, 1206, 1208, 1210, 1212, 1214. These components may be software components running in the processor 1304, software components resident / stored in the computer-readable medium / memory 1306, one or more hardware components coupled to the processor 1304, or some combination thereof. The processing system 1314 may be a component of the base station 310 and may include the memory 376 and / or at least one of the following: the TX processor 316, the RX processor 370, and the controller / processor 375. Alternatively, the processing system 1314 may be the entire base station (e.g., see Figure 3 310).

[0107] In one configuration, an apparatus 1202 / 1202' for wireless communication includes means for transmitting information to a second wireless device connected to a first cell and requesting a connection to a second cell, wherein the second cell includes at least one of: a different parameter design from the first cell, or asynchronous with the first cell. In one configuration, the apparatus may include means for determining a beam associated with one of the first cell and the second cell that is successfully transmitted to the second wireless device. In one configuration, the apparatus may include means for determining a time overlap between a first signal of the first cell and a second signal of the second cell, wherein the second cell includes at least one of: a different parameter design from the first cell, or asynchronous timing relative to the first cell; and means for applying a beam prioritization rule for selecting a beam associated with a first signal of the first cell or a second signal of the second cell that carries information in a separate beam. In one configuration, the apparatus may include means for receiving information from the second wireless device based on the selected beam. In one configuration, the apparatus may include means for transmitting information to the second wireless device based on the selected beam. In one configuration, the device may include means for receiving, from a second wireless device, a timing difference between a time when downlink information is transmitted from a first cell and a second cell or a time when uplink information is received at the first cell and the second cell, wherein the beam is determined based on the timing difference. The aforementioned means may be one or more of the aforementioned components of the device 1202 and / or the processing system 1314 of the device 1202' configured to perform the functions recited by the aforementioned means. As described above, the processing system 1314 may include a TX processor 316, an RX processor 370, and a controller / processor 375. As such, in one configuration, the aforementioned means may be a TX processor 316, an RX processor 370, and a controller / processor 375 configured to perform the functions recited by the aforementioned means.

[0108] It should be understood that the specific order or hierarchy of each box in the disclosed process / flowchart is an illustration of an example approach. It should be understood that the specific order or hierarchy of each box in these process / flowcharts can be rearranged based on design preferences. In addition, some boxes can be combined or omitted. The attached method claims present the elements of various boxes in an exemplary order and are not meant to be limited to the specific order or hierarchy presented.

[0109] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be easily understood by those skilled in the art, and the universal principles defined in this article can be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown in this article, but should be granted the full scope consistent with the claims in language, wherein the singular reference of the elements is not intended to represent "there is and only one", but "one or more", unless otherwise stated. Terms such as "if", "when..." and "when..." should be interpreted as meaning "under the condition", rather than implying a direct time relationship or reaction. That is, these phrases (e.g., "when...") do not imply an immediate action in response to the occurrence of an action or during the occurrence of an action, but only imply that an action will occur when the condition is met, and no specific or immediate time constraints are required for the action to occur. The wording "exemplary" is used herein to mean "used as an example, instance or explanation". Any aspect described as "exemplary" herein need not be interpreted as being superior to or superior to other aspects. Unless otherwise stated, the term "some / certain" 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 multiple A, multiple B, or multiple 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, wherein 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 the disclosure that are currently or later known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly recited in the claims. The terms "module," "mechanism," "element," "device," etc. may not be a substitute for the term "means." Thus, no claim element should be construed as a means-plus-function unless the element is explicitly recited using the phrase "means for..."

[0110] The following examples are merely illustrative and may be combined with aspects of other embodiments or teachings described herein without limitation.

[0111] Example 1 is a method for wireless communication at a first wireless device, the method comprising: determining a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a parameter design different from that of the first cell, or asynchronous timing relative to the first cell; applying a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information in a separate beam; and transmitting information to or receiving information from the second wireless device based on the selected beam.

[0112] Example 2 is the method of Example 1, wherein the beam prioritization rule is applied during each symbol or at each symbol boundary of one of the first cell or the second cell, and wherein one of the first cell or the second cell includes: a target cell, a source cell, one of the first cell or the second cell with a longer symbol duration, one of the first cell or the second cell with a shorter symbol duration, or a cell identified according to one of a radio resource control (RRC) message or a media access control (MAC) control element (MAC-CE).

[0113] Example 3 is a method of any one of Example 1 and Example 2, wherein a first wireless device is connected to a first cell and a second cell, wherein the second cell includes a parameter design different from that of the first cell; and wherein a beam prioritization rule is applied during a code element of a cell in the first cell or the second cell.

[0114] Example 4 is a method of any one of Examples 1 to 3, wherein a beam prioritization rule is applied to each codeword in one of the first cell or the second cell, and wherein a beam having a determined higher priority at the beginning of each codeword is used for transmission or reception during each codeword.

[0115] Example 5 is a method of any one of Examples 1 to 4, wherein the first wireless device is connected to a first cell and a second cell, wherein the second cell is asynchronous with the first cell; and wherein the beam prioritization rule is applied at a symbol boundary of one of the first cell or the second cell.

[0116] Example 6 is the method of any of Examples 1 to 5, wherein one of the first cell or the second cell comprises a cell associated with a current downlink or uplink communication.

[0117] Example 7 is the method of any one of Examples 1 to 6, further comprising: refraining from applying the beam prioritization rule on partially aligned symbols of the first cell and the second cell.

[0118] Example 8 is the method of any one of Examples 1 to 7, wherein a beam prioritization rule is applied at each symbol boundary of a cell having a longer symbol duration in a first cell or a second cell, wherein a beam used for the other cell in the first cell or the second cell includes a higher priority at each shorter symbol boundary within the longer symbol duration, and wherein a beam used for the other cell in the first cell or the second cell is used for transmission or reception at each shorter symbol boundary within the longer symbol duration.

[0119] Example 9 is a method of any one of Examples 1 to 8, wherein a beam prioritization rule is applied for at least one of: a simultaneous physical downlink control channel (PDCCH) beam, a default physical downlink shared channel (PDSCH) beam, a downlink channel beam including a first reference signal, an uplink channel beam including a second reference signal, a beam from a first cell and a second cell, or a beam to a first cell and a second cell.

[0120] Example 10 is the method of any one of Examples 1 to 9, wherein the second cell includes a different parameter design from the first cell, and wherein the beam prioritization rule restricts the first wireless device from being simultaneously connected to the first cell and the second cell having different parameter designs.

[0121] Example 11 is the method of any one of Examples 1 to 10, wherein the second cell is asynchronous with the first cell, and wherein the beam prioritization rule restricts the first wireless device from being connected to the first cell and the second cell simultaneously when the second cell is asynchronous with the first cell.

[0122] Example 12 is the method of any one of Examples 1 to 11, further comprising: transmitting a timing difference between the first cell and the second cell to a second wireless device, wherein the timing difference is for downlink communication or uplink communication.

[0123] Example 13 is a method of any one of Examples 1 to 12, wherein a first wireless device is connected to a first cell and a second cell, the method further comprising: receiving continuous transmissions having the same beam indication for one of the first cell or the second cell, wherein a beam prioritization rule is applied after receiving the continuous transmissions.

[0124] Example 14 is the method of any one of Examples 1 to 13, further comprising: suppressing application of a beam prioritization rule during the continuous transmission.

[0125] Example 15 is a method of any one of Examples 1 to 14, wherein the continuous transmission includes at least one of: a control resource set (CORESET) or a synchronization signal block (SSB) with a potential physical downlink control channel (PDCCH) transmission, a downlink signal associated with a decoded transmission configuration index (TCI) state, or an uplink signal associated with a decoded spatial relationship of an uplink signal.

[0126] Example 16 is an apparatus for wireless communication at a first wireless device, comprising: a memory; and at least one processor coupled to the memory, configured to: determine a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a parameter design different from that of the first cell, or asynchronous timing relative to the first cell; apply a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information in a separate beam; and transmit information to or receive information from the second wireless device based on the selected beam.

[0127] Example 17 is the apparatus of Example 16, wherein the beam prioritization rule is applied during each symbol or at each symbol boundary of one of the first cell or the second cell, and wherein the one of the first cell or the second cell includes: a target cell, a source cell, one of the first cell or the second cell having a longer symbol duration, one of the first cell or the second cell having a shorter symbol duration, or a cell identified according to one of a radio resource control (RRC) message or a media access control (MAC) control element (MAC-CE).

[0128] Example 18 is an apparatus of Example 16 or 17, wherein the first wireless device is connected to a first cell and a second cell, wherein the second cell includes a parameter design different from the first cell; and wherein the beam prioritization rule is applied during a code element of one of the first cell or the second cell.

[0129] Example 19 is an apparatus of any one of Examples 16 to 18, wherein a first wireless device is connected to a first cell and a second cell, wherein the second cell is asynchronous with respect to the first cell; and wherein a beam prioritization rule is applied at a symbol boundary of one of the first cell or the second cell.

[0130] Example 20 is the apparatus of any of Examples 16 to 19, wherein one of the first cell or the second cell comprises a cell associated with a current downlink or uplink communication.

[0131] Example 21 is a device of any one of Examples 16 to 20, wherein a beam prioritization rule is applied for at least one of: a simultaneous physical downlink control channel (PDCCH) beam, a default physical downlink shared channel (PDSCH) beam, a downlink channel beam including a first reference signal, an uplink channel beam including a second reference signal, a beam from a first cell and a second cell, or a beam to a first cell and a second cell.

[0132] Example 22 is an apparatus of any of Examples 16 to 21, wherein the second cell includes a parameter design different from the first cell, and wherein the beam prioritization rule restricts the first wireless device from being simultaneously connected to the first cell and the second cell having different parameter designs.

[0133] Example 23 is the apparatus of any of Examples 16 to 22, wherein the second cell is asynchronous with the first cell, and wherein the beam prioritization rule restricts the first wireless device from being connected to the first cell and the second cell simultaneously when the second cell is asynchronous with the first cell.

[0134] Example 24 is the apparatus of any one of Examples 16 to 23, wherein the at least one processor is further configured to: transmit a timing difference between the first cell and the second cell to a second wireless device, wherein the timing difference is for downlink communication or uplink communication.

[0135] Example 25 is an apparatus of any of Examples 16 to 24, wherein the first wireless device is connected to a first cell and a second cell, and the at least one processor is further configured to receive consecutive transmissions having the same beam indication for one of the first cell or the second cell, wherein the beam prioritization rule is applied after receiving the consecutive transmissions.

[0136] Example 25 is the apparatus of any of Examples 16 to 25, wherein the at least one processor is further configured to refrain from applying a beam prioritization rule during the continuous transmission.

[0137] Example 27 is an apparatus of any of Examples 16 to 26, wherein the continuous transmission includes at least one of: a control resource set (CORESET) or a synchronization signal block (SSB) with a potential physical downlink control channel (PDCCH) transmission, a downlink signal associated with a decoded transmission configuration index (TCI) state, or an uplink signal associated with a decoded spatial relationship of an uplink signal.

[0138] Example 28 is a device for wireless communication at a first wireless device, comprising: a device for determining a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a parameter design different from that of the first cell, or asynchronous timing relative to the first cell; a device for applying a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information in a separate beam; and a device for transmitting information to the second wireless device based on the selected beam or a device for receiving information from the second wireless device.

[0139] Example 29 is the apparatus of Example 28, wherein the means for transmitting is further configured to transmit a timing difference between the first cell and the second cell to a second wireless device, wherein the timing difference is for downlink communication or uplink communication.

[0140] Example 30 is a non-transitory computer-readable medium storing computer-executable code for wireless communication at a first wireless device, which code, when executed by a processor, causes the processor to: determine a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes at least one of: a different parameter design than the first cell, or asynchronous timing relative to the first cell; apply a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information in a separate beam; and transmit information to or receive information from the second wireless device based on the selected beam.

Claims

1. A method for wireless communication at a first wireless device, comprising: determining a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes a different parameter design than the first cell and timing that is optionally asynchronous relative to the first cell; applying a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell that carries information in separate beams, wherein the beam prioritization rule restricts the first wireless device from being simultaneously connected to the first cell and the second cell having different parameter designs; as well as Information is transmitted to or received from a second wireless device based on the selected beam.

2. The method of claim 1 , wherein the beam prioritization rule is applied during each symbol or at each symbol boundary of one of the first cell or the second cell, and wherein the one of the first cell or the second cell comprises: Target cell, Source cell, the cell having a longer symbol duration among the first cell or the second cell, the first cell or the second cell having a shorter symbol duration, or A cell identified according to one of a radio resource control (RRC) message or a medium access control (MAC) control element (MAC-CE).

3. The method according to claim 1, wherein the first wireless device is connected to the first cell and the second cell; and Wherein the beam prioritization rule is applied during a symbol of one of the first cell or the second cell.

4. The method of claim 1, wherein the beam prioritization rule is applied on each codeword of one of the first cell or the second cell, and wherein the beam having the determined higher priority at the beginning of each codeword is used for the transmission or the reception during each codeword.

5. The method according to claim 1, wherein the first wireless device is connected to the first cell and the second cell, wherein the second cell is asynchronous with respect to the first cell; and Wherein the beam prioritization rule is applied at a symbol boundary of one of the first cell or the second cell.

6. The method of claim 5, wherein the one of the first cell or the second cell comprises a cell associated with a current downlink or uplink communication.

7. The method of claim 5, further comprising: Applying the beam prioritization rule on partially aligned symbols of the first cell and the second cell is refrained.

8. The method of claim 1 , wherein the beam prioritization rule is applied at each symbol boundary of a cell having a longer symbol duration in the first cell or the second cell, wherein a beam used for the other cell in the first cell or the second cell includes a higher priority at each shorter symbol boundary falling within the longer symbol duration, and wherein a beam used for the other cell in the first cell or the second cell is used for the transmission or the reception at each shorter symbol boundary falling within the longer symbol duration.

9. The method of claim 1, wherein the beam prioritization rule is applied for at least one of: At the same time, the physical downlink control channel (PDCCH) beam, Default Physical Downlink Shared Channel (PDSCH) beam, a downlink channel beam comprising a first reference signal, an uplink channel beam comprising a second reference signal, beams from the first cell and the second cell, or Beams to the first cell and the second cell.

10. The method of claim 1, further comprising: A timing difference between the first cell and the second cell is transmitted to the second wireless device, wherein the timing difference is for downlink communication or uplink communication.

11. The method of claim 1 , wherein the first wireless device is connected to the first cell and the second cell, the method further comprising: Successive transmissions having the same beam indication for one of the first cell or the second cell are received, wherein the beam prioritization rule is applied after receiving the consecutive transmissions.

12. The method of claim 11, further comprising: Applying the beam prioritization rule is refrained from during the continuous transmission.

13. The method of claim 11, wherein the continuous transmission comprises at least one of: Control Resource Set (CORESET) or Synchronization Signal Block (SSB) with potential Physical Downlink Control Channel (PDCCH) transmission, a downlink signal associated with a decoded transmission configuration index (TCI) state, or An uplink signal associated with the decoded spatial relationship of the uplink signal.

14. An apparatus for wireless communication at a first wireless device, comprising: Memory; as well as at least one processor coupled to the memory and configured to: determining a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes a different parameter design than the first cell and timing that is optionally asynchronous relative to the first cell; applying a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell that carries information in separate beams, wherein the beam prioritization rule restricts the first wireless device from being simultaneously connected to the first cell and the second cell having different parameter designs; as well as Information is transmitted to or received from a second wireless device based on the selected beam.

15. The apparatus of claim 14, wherein the beam prioritization rule is applied during each symbol or at each symbol boundary of one of the first cell or the second cell, and wherein the one of the first cell or the second cell comprises: Target cell, Source cell, the cell having a longer symbol duration among the first cell or the second cell, the first cell or the second cell having a shorter symbol duration, or A cell identified according to one of a radio resource control (RRC) message or a medium access control (MAC) control element (MAC-CE).

16. The device according to claim 14, wherein the first wireless device is connected to the first cell and the second cell; and Wherein the beam prioritization rule is applied during a symbol of one of the first cell or the second cell.

17. The device according to claim 14, wherein the first wireless device is connected to the first cell and the second cell, wherein the second cell is asynchronous with respect to the first cell; and Wherein the beam prioritization rule is applied at a symbol boundary of one of the first cell or the second cell.

18. The apparatus of claim 17, wherein the one of the first cell or the second cell comprises a cell associated with a current downlink or uplink communication.

19. The apparatus of claim 14, wherein the beam prioritization rule is applied for at least one of: At the same time, the physical downlink control channel (PDCCH) beam, Default Physical Downlink Shared Channel (PDSCH) beam, a downlink channel beam comprising a first reference signal, an uplink channel beam comprising a second reference signal, beams from the first cell and the second cell, or Beams to the first cell and the second cell.

20. The apparatus of claim 14, wherein the at least one processor is further configured to: A timing difference between the first cell and the second cell is transmitted to the second wireless device, wherein the timing difference is for downlink communication or uplink communication.

21. The apparatus of claim 14, wherein the first wireless device is connected to the first cell and the second cell, and the at least one processor is further configured to receive consecutive transmissions having the same beam indication for one of the first cell or the second cell, wherein the beam prioritization rule is applied after receiving the consecutive transmissions.

22. The apparatus of claim 21, wherein the at least one processor is further configured to refrain from applying the beam prioritization rule during the continuous transmission.

23. The apparatus of claim 21, wherein the continuous transmission comprises at least one of: Control Resource Set (CORESET) or Synchronization Signal Block (SSB) with potential Physical Downlink Control Channel (PDCCH) transmission, a downlink signal associated with a decoded transmission configuration index (TCI) state, or An uplink signal associated with the decoded spatial relationship of the uplink signal.

24. An apparatus for wireless communication at a first wireless device, comprising: means for determining a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell comprises a different parameter design than the first cell and timing that is optionally asynchronous with respect to the first cell; means for applying a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information in separate beams, wherein the beam prioritization rule restricts the first wireless device from being simultaneously connected to the first cell and the second cell having different parameter designs; as well as Means for transmitting information to a second wireless device based on the selected beam or means for receiving information from the second wireless device based on the selected beam.

25. The apparatus of claim 24, wherein the means for transmitting is further configured to transmit a timing difference between the first cell and the second cell to the second wireless device, wherein the timing difference is for downlink communication or uplink communication.

26. A computer readable medium storing computer executable code for wireless communication at a first wireless device, the code, when executed by a processor, causing the processor to: determining a time overlap between a first signal of a first cell and a second signal of a second cell, wherein the second cell includes a different parameter design than the first cell and timing that is optionally asynchronous relative to the first cell; applying a beam prioritization rule for selecting a beam associated with the first signal of the first cell or the second signal of the second cell that carries information in separate beams, wherein the beam prioritization rule restricts the first wireless device from being simultaneously connected to the first cell and the second cell having different parameter designs; as well as Information is transmitted to or received from a second wireless device based on the selected beam.

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