Interference measurement for each TX beam of each subband for combination of FDM and MU-MIMO

Abstract

Various aspects presented herein provide improved measurement and management of interference of different subbands and different Tx beams for communicating with a UE. The UE may be configured to receive a schedule for communicating with a base station using a first subband in a first beam direction. The UE may be configured to measure interference of a second subband in a second beam direction. The UE may also be configured to report the measured interference to the base station. The base station may be configured to schedule communication with the UE in a first beam direction using the first subband. The base station may also be configured to receive an interference report measured by the UE on a second subband in a second beam direction.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Non-Provisional Application No. 16 / 993,108, filed on August 13, 2020, entitled “INTERFERENCE MEASUREMENT PER SUBBAND ​​PER TX BEAM FOR COMBINATION OF FDM AND MU-MIMO,” and U.S. Provisional Application No. 62 / 886,897, filed on August 14, 2019, entitled “INTERFERENCE MEASUREMENT PER SUBBAND ​​PER TX BEAM FOR COMBINATION OF FDM AND MU-MIMO,” the entire contents of which are expressly incorporated herein by reference. Technical Field

[0003] The present disclosure relates generally to communication systems and, more particularly, to interference measurement in wireless communications. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of 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 a common protocol that enables different wireless devices to communicate at municipal, national, regional and even global levels. An example telecommunication standard is 5G New Radio (NR). 5G NR is 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. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC) and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvements in 5G NR technology. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0006] A simplified summary of one or more aspects is presented below in order to provide a basic understanding of these aspects. This summary is not an extensive overview of all contemplated aspects, and is neither intended to identify key or important elements of all aspects, nor to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that is presented later.

[0007] When a base station sends communications to a user equipment (UE) using a combination of multi-panel frequency division multiplexing (FDM) and multi-user multiple input multiple output (MU-MIMO) based on analog beamforming (BF), it may be challenging for the base station to determine the interference of different subbands and different transmission (Tx) beams within each subband for the purpose of scheduling UEs. In some applications, a specific number of UEs can be supported with a specific delay budget. Various aspects presented herein provide improved measurement and management of interference of different subbands and different Tx beams for communicating with UEs. Various aspects can provide an efficient way to determine interference in a specific subband of a specific Tx beam and find a better beam and subband for sending communications to the UE.

[0008] In one aspect of the present disclosure, a method, a computer readable medium, and an apparatus are provided. The apparatus may be a UE configured to receive a scheduling for communicating with a base station in a first beam direction using a first subband. The apparatus may be configured to measure interference of a second subband in a second beam direction. The apparatus may also be configured to report the measured interference to the base station.

[0009] In another aspect of the present disclosure, a method, a computer readable medium, and an apparatus are provided. The apparatus may be a base station configured to schedule communications with a UE in a first beam direction using a first subband. The apparatus may also be configured to receive an interference report measured by the UE on a second subband in a second beam direction.

[0010] To accomplish the foregoing and related ends, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features are indicative of only some of the various ways in which the principles of the various aspects may be employed, and this description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram illustrating an example of a wireless communication system and an access network.

[0012] Figure 2A , Figure 2B , Figure 2C and Figure 2D2 are schematic diagrams showing 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.

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

[0014] Figure 4 An example of interference measurement for each Tx beam for each subband is shown.

[0015] Figure 5 Another example of interference measurement for each Tx beam of each subband is shown.

[0016] Figure 6 Yet another example of interference measurement for each Tx beam of each subband is shown.

[0017] Figure 7 is a visual depiction of the interference measurement call flow diagram for each Tx beam for each subband.

[0018] Figure 8 is a flow chart of a method of wireless communication.

[0019] Fig. 9 is a conceptual data flow diagram illustrating the flow of data between different parts / components in an example apparatus.

[0020] Fig.10 is a schematic diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.

[0021] Fig.11 is a flow chart of a method of wireless communication.

[0022] Fig.12 is a conceptual data flow diagram illustrating the flow of data between different parts / components in an example apparatus.

[0023] Fig.13 is a schematic diagram illustrating an example of a hardware implementation for an apparatus employing a processing system. DETAILED DESCRIPTION

[0024] 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 configuration in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid blurring such concepts.

[0025] 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.

[0026] For example, an element, or any part of an element, or any combination of elements can 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, gated logic, discrete hardware circuits, and other suitable hardware configured to perform various functions described throughout the present disclosure. One or more processors in a processing system can execute software. Software should be broadly interpreted as representing instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executable programs, execution threads, processes, functions, etc., whether they are referred to as software, firmware, middleware, microcode, hardware description languages, or other.

[0027] Therefore, 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 in or encoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. Storage media may be any available medium accessible 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 accessible by a computer.

[0028] Figure 11 is a schematic diagram showing 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.

[0029] Base stations 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 via a backhaul link 132 (e.g., an S1 interface). Base stations 102 configured for 5G / NR (collectively referred to as the Next Generation RAN (NG-RAN)) may interface with the core network 190 via a backhaul link 184. The base stations 102 may perform one or more of the following functions, among other functions: transmission of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and device tracking, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 may communicate with each other directly or indirectly (eg, through the EPC 160 or the core network 190) via a backhaul link 134 (eg, an X2 interface). The backhaul link 134 may be wired or wireless.

[0030] Base station 102 can communicate wirelessly with UE 104. Each of base stations 102 can provide communication coverage for a respective geographic coverage area 110. There can be overlapping geographic coverage areas 110. For example, a small cell 102' can have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network including both small cells and macro cells can be referred to as a heterogeneous network. A heterogeneous network can also include a home evolved Node B (eNB) (HeNB), which can provide services to a restricted group called a closed subscriber group (CSG). The communication link 120 between base station 102 and UE 104 can include an uplink (UL) (also known as a reverse link) transmission from UE 104 to base station 102 and / or a downlink (DL) (also known as a forward link) transmission from base station 102 to UE 104. The communication link 120 can use multiple input and multiple output (MIMO) antenna technology, including spatial multiplexing, beamforming and / or transmit diversity. The communication link can be through 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, etc. MHz) bandwidth per carrier allocated in carrier aggregation up to a total of Yx MHz (x component carriers) for transmission in each direction. The carriers may be adjacent or non-adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL ​​than for UL). The component carrier 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).

[0031] Certain 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). D2D communication may be performed via various wireless D2D communication systems, such as, for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on IEEE 802.11 standards, LTE, or NR.

[0032] The wireless communication system may also include a Wi-Fi access point (AP) 150 that communicates 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) before communicating to determine whether the channel is available.

[0033] The small cell 102' can operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell 102' can adopt NR and use the same 5 GHz unlicensed spectrum used by the Wi-Fi AP 150. The small cell 102' adopting NR in the unlicensed spectrum can improve the coverage of the access network and / or increase the capacity of the access network.

[0034] The base station 102, whether a small cell 102' or a large cell (e.g., a macro base station), may include an eNB, a gNodeB (gNB), or other types of base stations. Some base stations (such as gNB 180) may operate at millimeter wave (mmW) frequencies and / or near mmW frequencies in the traditional sub-6 GHz spectrum to communicate with the UE 104. When the gNB 180 operates at mmW or at 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. Radio waves in the band may be referred to as millimeter waves. Near mmW may 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 and is also referred to as centimeter waves. Communications using mmW / near mmW radio frequency bands (e.g., 3 GHz-300 GHz) have extremely high path losses and short distances. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range.

[0035] The base station 180 may transmit beamformed signals in one or more transmit directions 182' to the UE 104. The UE 104 may receive beamformed signals from the base station 180 in one or more receive directions 182'. The UE 104 may also transmit beamformed signals to the base station 180 in one or more transmit directions. The base station 180 may receive beamformed signals from the UE 104 in one or more receive directions. The base station 180 / UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 / UE 104. The transmit and receive directions of the base station 180 may be the same or may not be the same. The transmit and receive directions of the UE 104 may be the same or may not be the same.

[0036] 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 communicate 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. Typically, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transmitted 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 grant 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 collecting eMBMS-related charging information.

[0037] The core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may communicate with a unified data management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. Typically, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are transmitted 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 PS streaming media service, and / or other IP services.

[0038] A base station may also be referred to as a gNB, a Node B, an evolved Node B (eNB), an access point, a basic transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit receive point (TRP), or some other suitable term. Base station 102 provides an access point to EPC 160 or core network 190 for UE 104. Examples of UE 104 include a cellular phone, a 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, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, or any other similar functional device. Some of UE 104 may be referred to as IoT devices (e.g., a parking meter, a gas pump, a toaster, a vehicle, a heart monitor, etc.). UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0039] Refer again Figure 1In certain aspects, the base station 180 may include a scheduling component 198 configured to schedule communications with the UE 104 in a first beam direction using the first subband. The base station 180 may also be configured to receive a report of interference measured by the UE 104 on a second subband in a second beam direction. The scheduling component 198 may use the report of interference measured by the UE 104 on the second subband in the second beam direction to select a new beam / subband for communicating with the UE. The base station 180 may then schedule communications with the base station for the UE 104 using the second beam direction and the second subband. The UE 104 may include a measuring component 199 configured to measure interference of the second subband in the second beam direction when the UE is scheduled for communication on a different Tx beam and subband, and report the measured interference to the base station 180. The base station 180 may also report to the UE 104 the downlink modulation reference signal (DMRS) positions of other UEs scheduled in the second subband in the second beam direction, and the UE 104 may remove the DMRS of the other UEs from the interference measured in the second subband in the second beam direction, so that the reported measured interference represents the inter-cell interference of the UE 104 in the second subband in the second beam direction. 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.

[0040] Figure 2A 200 is a diagram illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2B is a diagram 230 showing 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 may be FDD, where for a particular set of subcarriers (carrier system bandwidth), subframes within a subcarrier set are dedicated to either DL or UL, or may be TDD, where for a particular set of subcarriers (carrier system bandwidth), subframes within a subcarrier set are dedicated to both DL and UL. Figure 2A , Figure 2CIn the example provided, the 5G / NR frame structure is assumed to be TDD, subframe 4 is configured with slot format 28 (mainly DL), where D is DL, U is UL, and X is flexibly used between DL / UL, and subframe 3 is configured with slot format 34 (mainly UL). Although subframe 3 and subframe 4 are shown with slot format 34 and slot format 28, respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot format 0 and slot format 1 are both DL and both UL, respectively. Other slot formats 2-61 include a mix of DL, UL and flexible symbols. The UE is configured with the slot format (dynamically through DL control information (DCI), or semi-statically / statically through 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 being FDD.

[0041] 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 a mini-time slot, 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 symbol on the DL may be a cyclic prefix (CP) OFDM (CP-OFDM) symbol. The symbol on the UL may be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbol (also known as a single carrier frequency division multiple access (SC-FDMA) symbol) (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 set. For slot configuration 0, different parameter sets μ from 0 to 5 allow 1, 2, 4, 8, 16 and 32 slots per subframe, respectively. For slot configuration 1, different parameter sets 0 to 2 allow 2, 4 and 8 slots per subframe, respectively. Therefore, for slot configuration 0 and parameter set μ, there are 14 symbols per slot and 2 per subframe. μ The subcarrier spacing and the symbol length per duration are functions of the parameter set. The subcarrier spacing can be equal to 2 μ *15kHz, where μ is parameter set 0 to 5. Thus, parameter set μ=0 has a subcarrier spacing of 15kHz, while parameter set μ=5 has a subcarrier spacing of 480kHz. The symbol length of each duration is inversely related to the subcarrier spacing. Figure 2A-2DAn example is provided for slot configuration 0, where there are 14 symbols per slot, and parameter set μ=0, where there is 1 slot per subframe. The subcarrier spacing is 15 kHz, and the symbol duration is approximately 66.7 μs.

[0042] A resource grid may be used to represent a frame structure. Each slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a plurality of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0043] like Figure 2A As shown, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) (indicated as Rx for one specific configuration, where 100x is the port number, but other DM-RS configurations are also possible) and a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0044] Figure 2B Examples of various DL channels within a subframe of a frame are shown. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE includes nine RE groups (REGs), and each REG includes four consecutive REs in an OFDM symbol. The primary synchronization signal (PSS) can be within symbol 2 of a specific subframe of the frame. The PSS is used by UE 104 to determine the subframe / symbol timing and the physical layer identification. The secondary synchronization signal (SSS) can be within symbol 4 of a specific subframe of the frame. The SSS is used by the UE to determine the physical layer cell identification group number and the radio frame timing. Based on the physical layer identification and the physical layer cell identification group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can 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. The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information not sent through the PBCH (such as System Information Blocks (SIBs)), and paging messages.

[0045] like Figure 2CAs shown, some of the REs carry DM-RS (indicated as R for one specific configuration, but other DM-RS configurations are also possible) for channel estimation at the base station. The UE can send DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS can be sent in the first one or two symbols of the PUSCH. The PUCCH DM-RS can be sent in different configurations, depending on whether a short PUCCH or a long PUCCH is sent and on the specific PUCCH format used. Although not shown, the UE can send a sounding reference signal (SRS). The SRS can be used by the base station for channel quality estimation to achieve frequency-dependent scheduling on the UL.

[0046] Figure 2D An example of various UL channels within a subframe of a frame is shown. The PUCCH may be located 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 HARQ ACK / NACK feedback. The PUSCH carries data and may additionally be used to carry buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0047] Figure 33 is a block diagram of a base station 310 in an access network communicating with a UE 350. 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 functions. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functions 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 for UE measurement reporting; PDCP layer functions associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with transmission 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 functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs to transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel priority.

[0048] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functions associated with various signal processing functions. Layer 1, including the physical (PHY) layer, may include error detection on the transmission channel, forward error correction (FEC) encoding / decoding of the transmission channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 processes the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). 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 generate 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, as well as for spatial processing. The channel estimates may be derived from a reference signal and / or channel condition feedback sent 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 respective spatial stream for transmission.

[0049] At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functions associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for the UE 350. If multiple spatial streams are 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 converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier and the reference signal are recovered and demodulated by determining the most likely signal constellation point sent by the base station 310. These soft decisions can be based on channel estimates calculated by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally sent on the physical channel by the base station 310. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functions.

[0050] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0051] Similar to the functions described in conjunction with the DL transmission of the base station 310, the controller / processor 359 provides RRC layer functions associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functions associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functions associated with transmission of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs to TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority processing, and logical channel priority.

[0052] Channel estimates derived by the channel estimator 358 from a reference signal or feedback sent by the base station 310 may be used by the 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 respective spatial stream for transmission.

[0053] 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.

[0054] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations. At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to combine Figure 1 199 to perform various aspects. At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to combine Figure 1 The 198 came to execute all aspects.

[0055] When a base station sends communications to a UE using a combination of multi-panel FDM and MU-MIMO based on analog BF, it may be challenging for the base station to determine the interference of different Tx beams in different subbands and each subband for the purpose of scheduling UEs. In some applications, a specific number of UEs can be supported with a specific delay budget. In order to accommodate as many UEs as possible, multiplexing can be increased. For example, even for each subband, several beams can be multiplexed to meet the requirements. However, increasing multiplexing may cause interference between different subbands and different Tx beams in each subband. Therefore, measurement and management of interference between different subbands and different Tx beams in each subband becomes desirable. It may be necessary to introduce a method for measuring interference in a specific subband of a specific Tx beam, and find better beams and subbands for transmission. The various aspects presented herein provide improved measurement and management of interference between different subbands and different Tx beams for communicating with UEs. Various aspects can provide an effective way to determine interference in a specific subband of a specific Tx beam, and find better beams and subbands for sending communications to UEs.

[0056] Figure 4An example 400 of interference measurement for each Tx beam for each subband is shown. This method involves non-intrusive measurement of subbands and Tx beam directions, but involves intrusive scheduling. In this method, a UE 404 may measure interference on beams and subband combinations that the UE 404 is not currently using to communicate with a base station (e.g., to receive downlink transmissions). The interference measurement may be based on a signal to interference plus noise ratio (SINR), a reference signal received power (RSRP), etc. measured for the Tx beams and subbands. Thus, the UE 404 measures interference on subbands and Tx beam directions in the absence of active traffic for the UE 404. The UE 404 may provide a report of the measured interference to the base station 402. The UE may report interference for one or more Tx beam directions and subband combinations. The UE may actively measure and report the measured interference, for example, without receiving instructions from the base station to perform the measurement. In other examples, the UE may receive an indication from the base station to perform the measurement. Figure 4 In the example of , the UE can measure interference on the Tx beam / subband without a reference signal from the base station. In the example without a reference signal, if the UE 404 is later scheduled for the subband and Tx beam direction combination for measurement, it may affect other UEs scheduled for the subband or Tx beam direction.

[0057] exist Figure 4 , base station 402 schedules UE 404 on beam 1 in subband 1 in time slot 1. UE 404 may measure interference using beam 2 in subband 3 in time slot 1. In some aspects, UE 404 may measure interference using beam 2 in subband 3 in another time slot (e.g., in a time slot after time slot 1). UE 404 may also measure interference using other beam-subband combinations (e.g., beam 2 in subband 2). UE 404 may measure interference for beam 2 in subband 3, e.g., based on SINR, RSRP, etc., without active traffic of UE 404 on beam 2 in subband 3.

[0058] The base station 402 may send the demodulation reference signal (DMRS) position of other UEs that have been scheduled in the beam-subband combination to be measured (e.g., other UEs scheduled to use beam 2 in subband 3) to the UE 404, so that the UE 404 can measure the DMRS of other UEs to estimate intra-cell interference. By compensating for intra-cell interference (e.g., subtracting intra-cell interference from the total measured received power), the UE 404 or the base station 702 may have an estimate of inter-cell interference on the measured subbands and beams. The UE 404 may report inter-cell interference to the base station 402, and / or may report total interference and intra-cell interference to the base station 402.

[0059] The base station 402 may further instruct the UE 404 which Rx beam to use in each subband so that the UE 404 may perform independent interference measurement.

[0060] In some aspects, the UE 404 may measure interference in another subband using the same beam as the beam scheduled for data reception. For example, the base station 402 may schedule the UE 404 on beam 1 in subband 1 in slot 1. The UE 404 may measure interference using beam 1 in subband 2 or beam 1 in subband 3. In these aspects, the UE 404 does not need to switch receive beams for performing other subband measurements, which may use fewer resources of the UE 404.

[0061] If the interference measurement shows low interference in the measured beams and subbands (e.g., low interference from active traffic and / or low inter-cell interference), and / or the quality of the current Tx beam and subband (e.g., beam 1 in subband 1) is poor, the base station 402 can reschedule the UE 404 in the measured subband and beam combination (e.g., beam 2 in subband 3) so that the UE 404 can experience lower interference. In this way, the UE 404 can help the base station improve interference management and find better beams and subbands for sending communications to the UE.

[0062] exist Figure 4 In the example of , there may not be resources configured for UE 404 to perform measurements. Therefore, base station 402 may not schedule resources for measurement or send reference signals for UE 404 to use when performing measurements. Base station 402 may configure interference reporting for UE 404. Therefore, UE 404 may use resources that are not configured or scheduled for interference measurement, for example, as selected by UE 404, and may issue a report to base station 402 based on the reporting configuration. Since the reference signal (RS) for UE 404 in this method is not sent from base station 402, if UE 404 is scheduled for the measured subband and Tx beam direction (e.g., beam 2 and subband 3 in time slot n), other UEs scheduled for the same subband and Tx beam direction may suffer interference caused by transmission to UE 404.

[0063] Figure 5 Another example 500 of interference measurement for a subband and Tx beam combination different from the beam direction and subband on which the UE 504 is scheduled by the base station 502 is shown. Figure 5The method in may involve partially intrusive measurements performed by a base station 502 on a measured subband and beam direction, the base station 502 transmitting a signal for the UE 504 on the measured subband and beam direction during a portion of the time slot in which the UE 504 performs the measurement. Since the base station 502 transmits a signal in a portion of the time slot using the measured Tx beam and subband, later, scheduling of the UE 504 on the Tx beam and subband may be non-intrusive because other UEs may be aware of potential interference based on signal transmissions from the base station (e.g., other UEs may determine the potential interference caused by the UE 504 being rescheduled to the measured subband and beam direction based on signals transmitted to the UE 504 on the measured subband and beam direction). In the method, the base station 502 may transmit an RS (e.g., a CSI-RS) on a subband and a specific Tx beam direction during a subset of symbols (e.g., 503) in which other UEs may be co-scheduled. As Figure 5 As shown, UE 504 may be scheduled on beam 1 and subband 1. UE 504 may receive RS from base station 502 in subband 3 and symbol subset 503 in Tx beam 2 during a portion of time slot 1. UE 504 may use RS 503 it receives from the base station to measure interference for active traffic in subband 3 of beam 2 in time slot 1. If the base station changes to schedule UE 504 on subband 3 and beam 2, the interference measured by other UEs (e.g., will cause UE 504 to be rescheduled to subband 3 and beam 2) may be accurate for some of the symbol subsets (e.g., where RS is transmitted), but may have interference mismatch for other symbols. Figure 5 The method in utilizes more resources for transmission by the base station 502 to the UE 504, but can provide non-intrusive scheduling of the base station.

[0064] Figure 6 Yet another example 600 of interference measurement for each Tx beam for each subband is shown. Figure 6 Examples in can include fully invasive measurements. Figure 4 and Figure 5 In the example described, UE 604 can measure interference for Tx beam and subband combinations for which base station 602 does not schedule UEs. In example 600, the base station can send RS on each symbol of the time slot for measurement. Figure 6As shown, for example, UE 604 may be scheduled on beam 1 and subband 1. UE 604 may measure interference in subband 3 of beam 2 during time slot 1 by receiving RS 603 from base station 602 in each symbol of time slot 1. UE 604 may measure interference of active traffic in subband 3 of beam 2 in time slot 1 using RS 603 received from base station 602. In this approach, interference measurements by other UEs for all symbols of the time slot (e.g., which would be caused by UE 604 being rescheduled to subband 3 and beam 2) may be accurate. Base station 602 will use the added resources to send RS in each of the symbols of time slot 1. There may be a trade-off between the accuracy of the interference measurement and the resources allocated for RS transmission by base station 602.

[0065] Although the above disclosure describes that the UE is scheduled for a first subband-beam combination and measures interference on a second subband-beam combination different from the first subband-beam combination, and the measurement is performed during the same time slot as the time slot in which the UE is scheduled for the first subband-beam combination, the present invention is not limited thereto. In some aspects, the UE may be scheduled for a first subband-beam combination in a first time slot and may measure interference for a second, non-scheduled subband-beam combination in another time slot.

[0066] Figure 7 is a visual depiction of interference measurement for each Tx beam for each subband. Base station 702 may schedule UE 704 for communication using a first beam in a first subband, for example, as described in conjunction with Figure 4-Figure 6 , and the base station 702 may send a schedule 705 to the UE 704. For example, the UE 704 may receive a schedule on beam 1 of subband 1 from the base station 702. In some aspects, as will be discussed further below, the UE may measure interference for unconfigured / non-scheduled Tx beams and subband combinations. For example, the UE 704 may use unconfigured resources (e.g., resources that the UE 704 is not scheduled to receive communications from the base station 702) to measure interference on subband 3 of beam 2, as in combination with Figure 4 In some aspects, the UE 704 may measure interference on Tx beam and subband combinations other than the scheduled beam and subband combinations based on the scheduled interference measurement resources (e.g., zero-power CSI-RS or non-zero-power CSI-RS) from the base station. Figure 4 As described, for example, UE 704 may actively measure interference using beam 2 in subband 3.

[0067] In some aspects, as described above, the base station 702 may send the DMRS locations 706 of other UEs to the UE 704. The DMRS locations 706 may be locations (e.g., resources) scheduled for the base station 702 to send DMRS to other UEs scheduled in unconfigured / non-scheduled Tx beam and subband combinations where the UE 704 will measure interference.

[0068] The base station may configure the interference report for the UE 704 and send the configuration of the interference report 707 to the UE 704. The UE 704 may receive the configuration of the interference report 707.

[0069] In some aspects, the base station 702 may send the RS 709 to the UE 704. In one method, the base station 702 may send the RS 709 in at least a subset of symbols of a time slot on a second subband in a second beam direction. Figure 5 As shown, the base station may transmit RS 709 in a subset of symbols in subband 3 of beam 2 in time slot 1. In some aspects, as Figure 6 As shown, the base station may send RS 709 in each symbol for measurement.

[0070] At 710, UE 704 may measure interference in the second subband. In some aspects, UE 704 may measure interference in the second subband and in the second Tx beam direction. In some aspects, UE 704 may measure interference in the second subband in the first Tx beam direction. For example, UE 704 may measure SINR, RSRP, etc. of the second subband and the first or second Tx beam direction. In some aspects, UE 704 may measure interference or SINR and / or RSRP in the second subband and the first or second Tx beam direction without the need for active traffic from base station 702 for UE 704 and without being scheduled by base station 702 to measure in the second subband and the second Tx beam direction and (e.g., autonomous measurement). In some aspects, UE 704 may measure interference using reference signal 709 from base station 702 in at least a portion of a time slot. As described above, based on the DMRS for other UEs transmitted by the base station 702 based on the DMRS position 706 of the other UEs, the UE 704 can determine the intra-cell interference (or a value corresponding to the intra-cell interference) in the second subband and the first or second Tx beam direction. For example, the UE 704 can measure the DMRS received at the DMRS position 706, and can determine the interference (or a value corresponding to the interference) in the second subband and the first or second Tx beam direction to be received from other UEs based on the DMRS received at the DMRS position 706. By removing the intra-cell interference from the total interference measured in the second subband and the first or second Tx beam direction, the UE 704 can determine the inter-cell interference (or a value corresponding to the inter-cell interference) in the second subband and the first or second Tx beam direction.

[0071] The UE 704 may send a report 712 of interference measured at 710 (e.g., measured using unconfigured resources or RS 709). The report 712 may be based on the configuration of the interference report 707 received from the base station 702. The UE 704 may report measurements of one or more Tx beam and subband combinations (e.g., in the report 712 or in a separate report). The report 712 may indicate total interference measured for the second subband and the first or second Tx beam direction (e.g., based on SINR or RSRP), may include intra-cell interference measured for the second subband and the first or second Tx beam direction, and / or may include inter-cell interference measured for the second subband and the first or second Tx beam direction. The UE 704 may determine one or more types of interference and include the interference in the report 712, or may include measurement values ​​corresponding to one or more types of interference in the report 712 and the base station 702 may determine the one or more types of interference from the measurements.

[0072] If the interference reported by the UE 704 shows low interference (e.g., total interference, intra-cell interference, or inter-cell interference) on the second, non-scheduled Tx beam and subband, and / or if the quality of the Tx beam and subband scheduled for the UE in the schedule 705 is poor, the base station 702 may reschedule the UE 704 in the first or second beam (e.g., beam 1 or beam 2 of subband 3) in the second subband with lower interference, and may send a schedule 714 to the UE 704. For example, at 713, the base station 702 may determine a better Tx beam and subband combination for the UE 704 based on the report 712 received from the UE 704, and the schedule 714 may reschedule the UE 704 to use the better Tx beam and subband combination.

[0073] Figure 8 800 is a flowchart of a method of wireless communication. The method may be performed by a UE (e.g., UE 104, 404, 504, 604, 704, 1250; apparatus 902 / 902'; processing system 1014, which may include memory 360 and which may be the entire UE or a component of the UE, such as TX processor 368, RX processor 356 and / or controller / processor 359). To facilitate understanding of the techniques and concepts described herein, the method of flowchart 800 may be referred to Figure 4-Figure 7 Optional aspects may be shown in dashed lines. Various aspects presented herein provide improved measurement and management of interference in different subbands and different Tx beams for communicating with a UE. Various aspects may provide an efficient way to determine interference in a specific subband of a specific Tx beam and find a better beam and subband for sending communications to the UE. The method may enable the UE to perform interference measurements for each beam of each subband and help the base station schedule the UE to a subband with lower interference for communication, thereby improving reliability and reducing latency.

[0074] At 802, a UE may receive a schedule for communicating with a base station using a first subband in a first beam direction. For example, 802 may be performed by Fig. 9 The scheduling component 908 shown executes. For example, returning to reference Figure 4-Figure 7 At 705, the base station 702 may schedule the UE 702 for communication using a first beam in a first subband, e.g., as in conjunction with Figure 4-Figure 6 For example, UE 704 may receive scheduling from base station 702 on beam 1 of subband 1.

[0075] At 804, the UE may receive a configuration for interference reporting. For example, 804 may be performed by Fig. 9The configuration component 910 shown is executed. In some aspects, the UE can use unconfigured resources to report measured interference based on the configuration of the interference report. For example, returning to reference Figure 4-Figure 7 At 707, the base station may configure interference reporting for UE 704. UE 704 may receive the configuration of interference reporting. Figure 4 In the example of , there may not be resources configured for the UE to perform measurements. Therefore, base station 402 may not schedule resources for measurement or send reference signals for UE 404 to use when performing measurements. The base station may configure interference reporting for the UE. Therefore, the UE may use resources that are not configured or scheduled for interference measurement, for example, as selected by the UE, and may issue a report to the base station based on the reporting configuration.

[0076] At 806, the UE may receive an RS from the base station in at least a subset of symbols of a time slot on the second subband. For example, 806 may be performed as follows: Fig. 9 The RS component 912 shown is executed. The UE can measure interference on the second subband of the second beam direction, and the DMRS sent from the base station to another UE can be scheduled in the second subband and the second beam direction. The UE can use the reference signal from the base station to measure the interference of the active traffic on the second subband. For example, returning to the reference Figure 4-Figure 7 , the base station 702 may send RS 709. In one method, the base station 702 may send RS in at least a subset of symbols in the time slot on the second subband. For example, the base station may send RS in a subset of symbols in subband 3 of beam 2 in time slot 1, such as Figure 5 In one method, the base station may send RS in each symbol for measurement, such as Figure 6 shown.

[0077] At 808, the UE may measure interference in the second subband. For example, 808 may be performed as follows: Fig. 9 The measurement component 914 shown performs. For example, returning to reference Figure 4-Figure 7 At 710, UE 704 may measure interference in the subband and Tx beam direction. For example, UE 704 may measure SINR, RSRP, etc. in the subband and Tx beam direction. Figure 4-Figure 6 , UE 704 may measure interference or SINR and / or RSRP in the absence of active traffic for UE 704 from base station 702. Alternatively, UE 704 may measure interference using a reference signal from the base station in at least a portion of the time slot, as at 709. Figure 4An example 400 of interference measurement for each Tx beam for each subband is shown. This method involves non-intrusive measurement of subbands and Tx beam directions, but involves intrusive scheduling. In this method, the UE 404 can measure interference on beam and subband combinations that the UE 404 is not currently using to communicate with the base station (e.g., receive downlink transmissions). The interference measurement can be based on the signal to interference plus noise ratio (SINR), reference signal received power (RSRP), etc. measured for the Tx beam and subband. Therefore, the UE 404 measures the interference on the subbands and Tx beam directions in the absence of active traffic for the UE 404. Figure 4 , base station 402 schedules UE 404 on beam 1 in subband 1 in time slot 1. UE 404 may measure interference using beam 2 in subband 3 in time slot 1. For example, UE 404 may also measure interference of beam 2 in subband 2. UE 404 may measure interference of beam 2 in subband 3, for example, based on SINR, RSRP, etc., without active traffic of UE 404 on beam 2 in subband 3.

[0078] In some aspects, before reporting the measured interference to the base station, the UE may remove the DMRS from the base station for another UE from the measured interference. Figure 4-Figure 7 , the base station 402 may send the DMRS positions of other UEs that have been scheduled to the UE 404, so that the UE 404 may measure the DMRS of other UEs scheduled in the second subband to estimate the intra-cell interference. By subtracting the intra-cell interference from the total measured received power, the UE 404 may have an estimate of the inter-cell interference.

[0079] In some aspects, the UE may measure interference in the second subband based on an indication from the base station. Figure 4-Figure 7 , the base station 402 may further instruct the UE 404 which Rx beam to use in each subband so that the UE 404 can perform independent interference measurements. If the interference measurement shows low interference, and / or the quality of the current Tx beam and subband (e.g., beam 1 in subband 1) is poor, the base station 402 may reschedule the UE 404 in a new subband and beam combination (e.g., beam 2 in subband 3) so that the UE 404 can experience lower interference.

[0080] exist Figure 4 In the example of , there may be no resources configured for the UE to perform measurements. Therefore, the base station 402 may not schedule resources for measurement or send a reference signal for the UE 404 to use when performing measurements.

[0081] exist Figure 5In the method shown, during a subset of symbols (e.g., 503) in which other UEs may be co-scheduled, the base station 502 may transmit RS in a subband and a specific Tx beam direction. The UE 504 may measure interference to active traffic in subband 3 of beam 2 in time slot 1 using the RS 503 it receives from the base station. Figure 6 In the method shown, the base station may send RS on each symbol of a time slot for measurement. UE 604 may use RS 603 received from base station 602 to measure interference of active traffic in subband 3 of beam 2 in time slot 1.

[0082] At 810, the UE may report the measured interference to the base station. For example, 810 may be performed by Fig. 9 The reporting component 916 shown executes. For example, returning to reference Figure 4-Figure 7 At 712, the UE 704 may report the measured interference, for example, using unconfigured resources, and the report may be based on the configuration of the interference report 707. The UE may report measurements of one or more Tx beam and subband combinations.

[0083] At 812, after reporting the measured interference, the UE may receive additional scheduling for communication with the base station in the second subband. For example, 812 may be performed by Fig. 9 The scheduling component 908 shown executes. For example, returning to reference Figure 4-Figure 7 At 714, if the measurements reported by the UE 704 show low interference on the non-scheduled Tx beams and subbands, or if the quality of the existing Tx beams and subbands is poor, the base station 702 may reschedule the UE 704 in a second beam in a second subband with lower interference (e.g., beam 2 of subband 3). For example, at 713, the base station may determine a better Tx beam and subband combination for the UE 704 based on the report 712 received from the UE 704.

[0084] Fig. 9 900 is a conceptual data flow diagram illustrating the data flow between different parts / components in an example apparatus 902. The apparatus may be a UE (e.g., UE 104, 404, 504, 604, 704, 1250; apparatus 902 / 902'; processing system 1014, which may include memory 360 and which may be the entire UE or a component of the UE, such as TX processor 368, RX processor 356 and / or controller / processor 359). The apparatus includes a receiving component 904 configured to receive a scheduling / configuration / RS from a base station, for example, as described in conjunction with Figure 8 The apparatus includes a transmission component 906 configured to send an interference measurement report to a base station, for example, as described in conjunction with Figure 8The apparatus includes a scheduling component 908 configured to receive scheduling information from a base station via a receiving component 904, for example, as described in conjunction with Figure 8 The apparatus includes a configuration component 910 configured to receive a configuration from a base station via a receiving component 904, for example, as described in conjunction with Figure 8 The apparatus includes an RS component 912 configured to receive RS from a base station via the receiving component 904, for example, as described in conjunction with Figure 8 The apparatus includes a measuring component 914 configured to measure interference of the second subband, for example, as described in conjunction with Figure 8 The apparatus includes a reporting component 916 configured to send an interference measurement report to a base station via the transmission component 906, for example, as described in conjunction with Figure 8 As described in 810.

[0085] The apparatus may include executing the aforementioned Figure 4-Figure 8 Each additional component of the algorithm in the flowchart box. Figure 4-Figure 8 Each block in the flowchart of can be performed by a component, and the device may include one or more of these components. These components can be one or more hardware components that are 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.

[0086] Fig.10 1 is a schematic diagram 1000 showing an example of a hardware implementation for an apparatus 902' employing a processing system 1014. The processing system 1014 may be implemented with a bus architecture, which is 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 together various circuits including one or more processors and / or hardware components, represented by the processor 1004, components 904, 906, 906, 908, 910, 912, 914, 916, 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.

[0087] 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 components 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 based on the received information, generates signals to be applied to the one or more antennas 1020. 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 that is manipulated by the processor 1004 when executing software. The processing system 1014 also includes at least one of the components 904, 906, 908, 910, 912, 914, 916. These components may be software components that run in the processor 1004, reside / 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 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).

[0088] In one configuration, a device 902 / 902' for wireless communication includes a component for receiving a schedule for communicating with a base station in a first beam direction using a first subband; a component for measuring interference of a second subband; and a component for reporting the measured interference to the base station. The device also includes a component for receiving an additional schedule for communicating with the base station in the second subband after reporting the measured interference. The device also includes a component for receiving a configuration for interference reporting, wherein the UE reports the measured interference using unconfigured resources based on the configuration for interference reporting. The device also includes a component for receiving a reference signal from the base station in at least a subset of symbols of a time slot on the second subband, wherein the UE uses the reference signal from the base station to measure interference of active traffic on the second subband. The device also includes a component for receiving a reference signal from the base station in each symbol of the time slot on the second subband, wherein the UE uses the reference signal from the base station to measure interference of active traffic on the second subband.

[0089] The aforementioned means may be one or more of the aforementioned components of the processing system 1014 of the device 902 and / or device 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. Thus, 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.

[0090] Fig.11 1100 is a flowchart of a method of wireless communication. The method may be performed by a base station (e.g., base station 102 / 180, 402, 502, 602, 702, 950; device 1202 / 1202'; processing system 1314, which may include memory 376 and may be the entire base station or a component of the base station, such as TX processor 316, RX processor 370 and / or controller / processor 375). To facilitate understanding of the techniques and concepts described herein, the method of flowchart 1100 may be referred to as Figure 4-Figure 7 Optional aspects may be shown in dashed lines. Various aspects presented herein provide improved measurement and management of interference in different subbands and different Tx beams for communicating with a UE. Various aspects may provide an efficient way to determine interference in a specific subband of a specific Tx beam and find a better beam and subband for sending communications to the UE. The method may enable the UE to perform interference measurements for each beam of each subband and help the base station schedule the UE to a subband with lower interference for communication, thereby improving reliability and reducing latency.

[0091] At 1102, the base station may schedule communication with the UE in the first beam direction using the first subband. For example, 1102 may be performed by Fig.12 The scheduling component 1216 shown executes. For example, returning to reference Figure 4-Figure 7 At 705, the base station 702 may schedule the UE 702 for communication using a first beam in a first subband, e.g., as in conjunction with Figure 4-Figure 6 For example, UE 704 may receive scheduling from base station 702 on beam 1 of subband 1.

[0092] At 1104, the base station may configure interference reporting for the UE. For example, 1104 may be performed by Fig.12 The configuration component 1208 shown performs. In some aspects, the report received from the UE is based on the configuration from the base station. For example, returning to the reference Figure 4-Figure 7 At 707, the base station may configure interference reporting for UE 704. UE 704 may receive the configuration of interference reporting. Figure 4In the example of , there may not be resources configured for the UE to perform measurements. Therefore, base station 402 may not schedule resources for measurement or send reference signals for UE 404 to use when performing measurements. The base station may configure interference reporting for the UE. Therefore, the UE may use resources that are not configured or scheduled for interference measurement, for example, as selected by the UE, and may issue a report to the base station based on the reporting configuration.

[0093] At 1106, the base station may send the RS in at least a subset of symbols of the time slot on the second subband. For example, 1106 may be performed by Fig.12 The RS component 1210 shown in FIG. 10 performs. DMRS resources for another UE may be scheduled in a second subband in a second beam direction. The UE may use a reference signal from the base station to measure interference with active traffic on the second subband. For example, referring back to FIG. Figure 4-Figure 7 , base station 702 can send RS 709.

[0094] In some aspects, the base station may transmit a DMRS to another UE in the second subband, wherein the interference measured by the UE does not include the measurement of the DMRS from the base station. Figure 4-Figure 7 , the base station 402 can send the DMRS positions of other UEs that have been scheduled to the UE 404, so that the UE 404 can measure the DMRS of other UEs to estimate the intra-cell interference. By subtracting the intra-cell interference from the total measured received power, the UE 404 can have an estimate of the inter-cell interference.

[0095] In some aspects, the base station may indicate to the UE that the second subband is to be measured. Figure 4-Figure 7 , the base station 402 may further instruct the UE 404 which Rx beam to use in each subband so that the UE 404 can perform independent interference measurements. If the interference measurement shows low interference, and / or the quality of the current Tx beam and subband (e.g., beam 1 in subband 1) is poor, the base station 402 may reschedule the UE 404 in a new subband and beam combination (e.g., beam 2 in subband 3) so that the UE 404 can experience lower interference.

[0096] In one method, the base station 702 may send RS in at least a subset of symbols in a time slot on the second subband. For example, the base station may send RS in a subset of symbols in subband 3 of beam 2 in time slot 1, such as Figure 5 In one method, the base station may send RS in each symbol for measurement, such as Figure 6 shown.

[0097] At 1108, the base station may receive an interference report measured by the UE on the second subband. For example, 1108 may be performed by Fig.12The reporting component 1212 shown executes. For example, returning to reference Figure 4-Figure 7 At 712, the UE 704 may report the measured interference, for example, using unconfigured resources, and the report may be based on the configuration of the interference report 707. The UE may report measurements of one or more Tx beam and subband combinations.

[0098] At 1110, the base station may determine to schedule the UE on the second subband based at least in part on the report. For example, 1110 may be performed by Fig.12 The determination component 1214 shown executes. For example, returning to reference Figure 4-Figure 7 , if the measurements reported by the UE 704 show low interference on the non-scheduled Tx beams and subbands, or if the quality of the existing Tx beams and subbands is poor, the base station 702 may reschedule the UE 704 in a second beam in a second subband with lower interference (e.g., beam 2 of subband 3). For example, at 713, the base station may determine a better Tx beam and subband combination for the UE 704 based on the report 712 received from the UE 704.

[0099] At 1112, the base station may schedule additional communications for the UE in the second subband. For example, 1112 may be performed by Fig.12 The scheduling component 1216 shown executes. For example, returning to reference Figure 4-Figure 7 , at 714, if the measurements reported by UE 704 show low interference on non-scheduled Tx beams and subbands, or if the quality of existing Tx beams and subbands is poor, the base station 702 may reschedule UE 704 in a second beam in a second subband with lower interference (e.g., beam 2 of subband 3).

[0100] Fig.12 12 is a conceptual data flow diagram 1200 showing the data flow between different parts / components in an example apparatus 1202. The apparatus may be a base station (e.g., base station 102 / 180, 402, 502, 602, 702, 950; apparatus 1202 / 1202'; processing system 1314, which may include memory 376 and may be the entire base station or a component of the base station, such as TX processor 316, RX processor 370 and / or controller / processor 375). The apparatus includes a receiving component 1204 configured to receive an interference measurement report from a UE, e.g., as in conjunction with Fig.11 The apparatus includes a transmission component 1206 configured to transmit a scheduling / configuration / RS to a UE, for example, as described in conjunction with Fig.11 The apparatus includes a scheduling component 1216 configured to send scheduling information to the UE via the transmission component 1206, for example, as described in conjunction with Fig.11The apparatus includes a configuration component 1208 configured to send a configuration to the UE via a transmission component 1206, for example, as described in conjunction with Fig.11 The apparatus includes an RS component 1210 configured to send an RS to a UE via a transmission component 1206, for example, as described in conjunction with Fig.11 The apparatus includes a determining component 1214 configured to schedule the UE on the second subband based at least in part on the report, for example, as described in conjunction with Fig.11 As described in 1110.

[0101] The apparatus may include executing the aforementioned Figure 4-Figure 7 and Fig.11 Each additional component of the algorithm in the flowchart box. Figure 4-Figure 7 and Fig.11 Each block in the flowchart of can be performed by a component, and the device may include one or more of these components. These components can be one or more hardware components that are 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.

[0102] Fig.13 13 is a schematic diagram 1300 showing an example of a hardware implementation for an apparatus 1202' employing a processing system 1314. The processing system 1314 may be implemented with a bus architecture, which is generally represented by a bus 1324. The bus 1324 may include any number of interconnecting buses and bridges, depending on the specific application and overall design constraints of the processing system 1314. The bus 1324 links together various circuits including one or more processors and / or hardware components, represented by the processor 1304, components 1204, 1206, 1208, 1210, 1212, 1214, 1216, 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.

[0103] 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 components 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 based on the received information, generates signals to be applied to the one or more antennas 1320. 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 that is manipulated by the processor 1304 when executing software. The processing system 1314 also includes at least one of the components 1204, 1206, 1208, 1213, 1212, 1214, 1216. These components may be software components that run in the processor 1304, reside / 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 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).

[0104] In one configuration, an apparatus 1202 / 1202' for wireless communication includes a component for scheduling communications with a user equipment (UE) in a first beam direction using a first subband; and a component for receiving an interference report measured by the UE on a second subband. The apparatus may also include a component for determining to schedule the UE on the second subband based at least in part on the report, and a component for scheduling additional communications for the UE in the second subband. The apparatus may also include a component for configuring interference reports for the UE, wherein the reports received from the UE are based on the configuration from the base station. The apparatus may also include a component for sending a reference signal in at least a subset of symbols of a time slot on the second subband, wherein the report indicates interference of the reference signal caused by active traffic on the second subband. The apparatus may also include a component for sending a reference signal from the base station in each symbol of the time slot on the second subband, wherein the report indicates interference of the reference signal caused by active traffic on the second subband.

[0105] The aforementioned means may be one or more of the aforementioned components of the processing system 1314 of the device 1202 and / or device 1202' configured to perform the functions recited by the aforementioned means. As described above, the processing system 1314 may include the TX processor 316, the RX processor 370, and the controller / processor 375. Thus, in one configuration, the aforementioned means may be the TX processor 316, the RX processor 370, and the controller / processor 375 configured to perform the functions recited by the aforementioned means.

[0106] It should be understood that the specific order or hierarchy of the blocks in the disclosed process / flowchart is an illustration of an example method. Based on design preferences, it is understood that the specific order or hierarchy of the blocks in the process / flowchart can be rearranged. In addition, some blocks can be combined or omitted. The attached method claims present the elements of the various blocks in an example order and are not meant to be limited to the specific order or hierarchy presented.

[0107] The foregoing description is provided so that any person skilled in the art can practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not intended to be limited to the various aspects shown herein, but should be given a complete scope consistent with the claim language, wherein the reference to an element in the singular is not intended to represent "one and only one" (unless clearly stated), but refers to "one or more". The word "exemplary" is used herein to represent "serving as an example, instance or explanation". Any aspect described as "exemplary" in this article is not necessarily interpreted as being preferred or advantageous compared to other aspects. Unless otherwise clearly stated, the term "some" refers to one or more. Combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C" and "A, B, C or any combination thereof" include any combination of A, B and / or C, and may include multiples of A, multiples of B or multiples of C. Specifically, combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B and C," "one or more of A, B, and C," and "A, B, C, or any combination thereof" may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, wherein any such combination may include one or more components of A, B, or C. All structural and functional equivalents of the elements throughout the various aspects described in this disclosure that are known or later become known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, regardless of whether the content disclosed herein is expressly recorded in the claims, it is not intended to be dedicated to the public. The words "module," "mechanism," "element," "device," and the like may not be substitutes for the word "component." As such, no claim element should be interpreted as means plus function unless the claim element is expressly recorded using the phrase "component for..."

Claims

1. A method for wireless communication at a user equipment UE, comprising: receiving a schedule for communicating with a node in a first beam direction using a first subband; measuring interference on a second subband of a second beam direction relative to the node, wherein the UE is not scheduled to communicate with the node on the second subband of the second beam direction; measuring a demodulation reference signal DMRS scheduled in the second subband and sent from the node to another UE; and The measured interference is reported based on the measured DMRS sent to the other UE.

2. The method according to claim 1, wherein: The DMRS transmitted from the node to another UE is scheduled within the second subband and in the second beam direction.

3. The method according to claim 1, further comprising: An indicator is received from the node, the indicator indicating resources scheduled for the DMRS transmitted from the node to another UE.

4. An apparatus for wireless communication at a user equipment UE, comprising: Memory; and at least one processor coupled to the memory and configured to: receiving a schedule for communicating with a node in a first beam direction using a first subband; measuring interference on a second subband of a second beam direction relative to the node, wherein the UE is not scheduled to communicate with the node on the second subband of the second beam direction; measuring a demodulation reference signal DMRS scheduled in the second subband and sent from the node to another UE; and The measured interference is reported based on the measured DMRS sent to the other UE.

5. The device according to claim 4, wherein: The DMRS transmitted from the node to another UE is scheduled within the second subband and in the second beam direction.

6. The device according to claim 4, wherein: The processor is further configured to: After reporting the measured interference, an additional schedule for communicating with the node on the second subband is received.

7. The device according to claim 4, wherein: The processor is further configured to receive an indicator from the node, the indicator indicating resources scheduled for the DMRS to be transmitted from the node to another UE.

8. The device according to claim 4, wherein: The measured interference is reported based on the measured DMRS sent to the other UE by reporting an indication of one of total interference measured on the second subband, intra-cell interference measured on the second subband, or inter-cell interference measured on the second subband.

9. The device according to claim 4, wherein: The measured interference is reported based on the measured DMRS by removing the DMRS from the measured interference to determine inter-cell interference on the second subband.

10. The device according to claim 4, wherein: The processor is configured to measure interference of the second subband using non-scheduled resources.

11. The device according to claim 10, wherein: The processor is further configured to receive a configuration of interference reporting, and wherein the processor is configured to report the measured interference using the non-scheduled resources based on the configuration of the interference reporting.

12. The device according to claim 4, wherein: The processor is configured to measure the interference of the second subband based on the indication from the node.

13. The device according to claim 4, wherein: The processor is configured to measure interference of active traffic on the second subband in the absence of a reference signal from the node.

14. The device according to claim 4, wherein: The processor is further configured to receive a reference signal from the node in at least a subset of symbols of time slots on the second subband, and wherein the processor is configured to measure interference of active traffic on the second subband using the reference signal from the node.

15. The device according to claim 4, wherein: The processor is further configured to receive a reference signal from the node in each symbol of a time slot on the second subband, and wherein the processor is configured to measure interference of active traffic on the second subband using the reference signal from the node.

16. A method of wireless communication at a node, comprising: Scheduling communication with a user equipment UE in a first beam direction using a first subband; transmitting an indicator of a scheduled downlink demodulation reference signal (DMRS) resource for another UE scheduled in a second subband of a second beam direction relative to the node, wherein the UE is not scheduled for communication with the node on the second subband of the second beam direction; Receiving an interference report measured by the UE on the second subband based on the DMRS of another UE.

17. The method according to claim 16, wherein: The report includes interference measured on the second subband and measurement of the DMRS sent on the scheduled DMRS resources for another UE, and the method also includes: determining inter-cell interference of the UE on the second subband based on the interference and the measurement of the DMRS.

18. An apparatus at a node for wireless communication, comprising: Memory; and at least one processor coupled to the memory and configured to: Scheduling communication with a user equipment UE in a first beam direction using a first subband; transmitting an indicator of a scheduled downlink demodulation reference signal (DMRS) resource for another UE scheduled in a second subband of a second beam direction relative to the node, wherein the UE is not scheduled for communication with the node on the second subband of the second beam direction; Receiving an interference report measured by the UE on the second subband based on the DMRS of another UE.

19. The device according to claim 18, wherein: The report includes interference measured on the second subband and measurements of the DMRS sent on the scheduled DMRS resources for another UE.

20. The device according to claim 19, wherein The processor is further configured to determine inter-cell interference for the UE on the second subband based on the interference from the report and the measurement of the DMRS.

21. The device according to claim 18, wherein The report includes inter-cell interference of the UE on the second subband, the inter-cell interference being based on measurement of the DMRS sent on the scheduled DMRS resources.

22. The device according to claim 18, wherein The processor is further configured to: Based at least in part on the report, determine to schedule the UE on the second subband; and Additional communications for the UE are scheduled using the second subband.

23. The device according to claim 18, wherein The report indicates interference measured on non-scheduled resources.

24. The device according to claim 23, wherein: The processor is further configured to configure interference reporting for the UE, wherein the report received from the UE is based on the configured interference reporting.

25. The apparatus of claim 18, wherein: The processor is further configured to instruct the UE to measure interference of the second subband.

26. The device according to claim 18, wherein The report indicates interference based on active traffic on the second subband in the absence of a reference signal from the node.

27. The device according to claim 18, wherein The processor is further configured to transmit a reference signal in at least a subset of symbols of a time slot on the second subband, and wherein the report indicates the interference of the reference signal caused by active traffic on the second subband.

28. The apparatus of claim 18, wherein: The processor is further configured to transmit a reference signal from the node in each symbol of a time slot on the second subband, and wherein the report indicates the interference of the reference signal caused by active traffic on the second subband.

29. An apparatus for wireless communication at a user equipment UE, comprising: means for receiving a schedule for communicating with a node in a first beam direction using a first subband; means for measuring interference on a second subband of a second beam direction relative to the node, wherein the UE is not scheduled to communicate with the node on the second subband of the second beam direction; means for measuring a demodulation reference signal DMRS scheduled in the second subband and sent from the node to another UE; and Means for reporting measured interference based on the measured DMRS sent to the other UE.

30. An apparatus at a node for wireless communication, comprising: means for scheduling communication with a user equipment UE in a first beam direction using a first subband; means for sending an indicator of a scheduled downlink demodulation reference signal (DMRS) resource for another UE scheduled in a second subband of a second beam direction relative to the node, wherein the UE is not scheduled for communication with the node on the second subband of the second beam direction; Means for receiving an interference report measured by the UE on the second subband based on the DMRS of another UE.

31. A non-transitory computer storage medium storing instructions that, when executed by a processor, cause the processor to perform the method of any one of claims 1-3 and 16-17.

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