Method and apparatus for handling CRS interference in dynamic spectrum sharing

Abstract

The present disclosure relates to methods and devices, including apparatuses, such as UEs and / or base stations, for wireless communication. In one aspect, the apparatus can transmit an interference indication associated with a DSS, the interference indication corresponding to a capability of CRS interference cancellation. The apparatus can also receive CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells. Additionally, the apparatus can determine at least one of a location or a sequence of at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells. The apparatus can also mitigate interference from the at least one CRS corresponding to the at least one interfering cell, the interference mitigated based on the at least one of the location or the sequence of the at least one CRS.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to communication systems, and more specifically to CRS interference in wireless communication systems. BACKGROUND

[0002] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0003] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is a set of enhancements to the LTE mobile standard promulgated by Third Generation Partnership Project (3GPP). It is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDM with a cyclic prefix (CP) (CP-OFDM). The 5G NR SUMMARY

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

[0005] In one aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus can be a user equipment (UE). The apparatus can transmit, to a base station, an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation. The apparatus can also receive, from the base station, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells. The apparatus can further determine at least one of a location of at least one CRS or a sequence of the at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells, based on the received CRS assistance information. In addition, the apparatus can identify the at least one CRS based on the at least one of the location of the at least one CRS or the sequence of the at least one CRS. The apparatus can also measure one or more CRSs corresponding to the one or more interfering cells, where the one or more CRSs can include the at least one CRS, the one or more CRSs being measured based on an interference cancellation threshold. The apparatus can further select the at least one CRS based on the interference cancellation threshold. Moreover, the apparatus can mitigate interference from the at least one CRS corresponding to the at least one interfering cell, the interference being mitigated based on the at least one of the location of the at least one CRS or the sequence of the at least one CRS. The apparatus can also receive and decode a physical downlink shared channel (PDSCH) from the base station.

[0006] In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus can be a base station. The apparatus can receive, from a user equipment (UE), an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation. The apparatus can also configure CRS assistance information associated with the DSS. The apparatus can further transmit, to the UE, the CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells, the CRS assistance information including at least one of a location of at least one CRS or a sequence of the at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells. In addition, the apparatus can encode and transmit a physical downlink shared channel (PDSCH) to the UE. The apparatus can also adjust or switch the at least one CRS based on a movement of the UE. When adjusting or switching the at least one CRS, the apparatus can also reconfigure the CRS assistance information via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI).

[0007] To the accomplishment of the foregoing and related ends, one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more aspects. These aspects are indicative, however, of but a few of the various ways in which the principles of various aspects can be employed and the description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.

[0009] Figure 2A FIG. 2 is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure.

[0010] Figure 2B FIG. 3 is a diagram illustrating an example of DL channels within a subframe, in accordance with various aspects of the present disclosure.

[0011] Figure 2C FIG. 4 is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure.

[0012] Figure 2D FIG. 5 is a diagram illustrating an example of UL channels within a subframe, in accordance with various aspects of the present disclosure.

[0013] Figure 3 FIG. 6 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.

[0014] Figure 4 FIG. 7 is a diagram illustrating an example non-multimedia broadcast single frequency network (non-MBSFN) subframe, in accordance with one or more techniques of the present disclosure.

[0015] Figure 5A FIG. 8 is a diagram illustrating an example non-MBSFN subframe, in accordance with one or more techniques of the present disclosure.

[0016] Figure 5B FIG. 9 is a diagram illustrating an example non-MBSFN subframe, in accordance with one or more techniques of the present disclosure.

[0017] Figure 5C FIG. 10 is a diagram illustrating an example non-MBSFN subframe, in accordance with one or more techniques of the present disclosure.

[0018] Figure 6 FIG. 11 is a diagram illustrating an example communication between a UE and a base station, in accordance with one or more techniques of the present disclosure.

[0019] Figure 7 FIG. 12 is a flowchart of a method of wireless communication.

[0020] Figure 8 is a flowchart of a method of wireless communication.

[0021] Figure 9 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0022] Figure 10 is a diagram illustrating an example of a hardware implementation for an example apparatus. DETAILED DESCRIPTION

[0023] The detailed description set forth below, in connection with the appended drawings and embodiments described therewith, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein can be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form, rather than in detail, in order to avoid obscuring the concepts.

[0024] 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 can be implemented with electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0025] By way of example, an element, or any portion of an element, or any combination of elements can be implemented with a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system can execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0026] Accordingly, in one or more example embodiments, the functions described can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), compact disk ROM (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0027] Figure 1 FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100. The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC)). The base stations 102 can include macro cells (high power cellular base stations) and / or small cells (low power cellular base stations). The macro cells can include base stations. The small cells can include femtocells, picocells, and microcells.

[0028] The base stations 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 through the first backhaul links 132 (e.g., S I interface). The base stations 102 configured for 5G NR (collectively referred to as the Next Generation RAN (NG-RAN)) can interface with the core network 190 through the second backhaul links 184. In addition to other functions, the base stations 102 can perform one or more of the following functions: transmission of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution of paging information, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), user and device tracking, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 can communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface). The first, second, and third backhaul links 132, 184, and 134 can be wired or wireless.

[0029] The base stations 102 can wirelessly communicate with the UEs 104. Each of the 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 one or more macrocells 102. A network that includes both small cell and macrocells can be known as a heterogeneous network. A heterogeneous network can also include Home Evolved Node Bs (eNBs) (HeNBs), which can provide service to a restricted group known as a closed subscriber group (CSG). The communication links 120 between the base stations 102 and the UEs 104 can include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and / or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104. The communication links 120 can use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication links can be through one or more carriers, and each carrier can be a band of frequency waves having a predetermined width and can be used to transmit data between base stations 102 and UEs 104. The base stations 102 / UEs 104 can use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in the spectrum for transmission in each direction. The carriers can or can not be adjacent to each other. The allocation of carriers can be asymmetric with respect to DL and UL (e.g., more or less carriers can be allocated for DL than for UL). The component carriers can include a primary component carrier and one or more secondary component carriers. A primary component carrier can be referred to as a primary cell (PCell) and a secondary component carrier can be referred to as a secondary cell (SCell).

[0030] Some UEs 104 can communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 can use DL / UL WWAN spectrum. The D2D communication link 158 can 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 can be through a variety of wireless D2D communications systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards, LTE, or NR.

[0031] The wireless communications system can also include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like. When communicating in an unlicensed frequency spectrum, the STAs 152 / AP 150 can perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

[0032] The small cells 102' can operate in a licensed and / or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cells 102' can employ NR and use the same unlicensed frequency spectrum as used by the Wi-Fi AP 150, such as 5 GHz. The small cells 102' employing NR in an unlicensed frequency spectrum can boost coverage of the access network and / or increase capacity of the access network.

[0033] The electromagnetic spectrum is often subdivided based on frequency / wavelength into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz - 7. 125 GHz) and FR2 (24.25 GHz - 52.6 GHz). The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with respect to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

[0034] With the above in mind, unless specifically stated otherwise, it should be appreciated that the term “sub-6 GHz” or the like is used herein to generically refer to frequencies that can be less than 6 GHz, can be within FR1, or can include mid-band frequencies. Furthermore, unless specifically stated otherwise, it should be appreciated that the term “millimeter wave” or the like is used herein to generically refer to frequencies that can include mid-band frequencies, can be within FR2, or can be within the EHF band.

[0035] Base station 102 (whether it is a small cell 102' or a large cell (e.g., a macro base station)) may include and / or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations (e.g., gNB 180) may operate in conventional sub-6 GHz spectrum, millimeter wave frequencies, and / or near-millimeter wave frequencies to communicate with UE 104. When gNB 180 operates in millimeter wave or near-millimeter wave frequencies, gNB 180 may be referred to as a millimeter wave base station. Millimeter wave base station 180 may utilize beamforming 182 with UE 104 to compensate for path loss and short range. Base station 180 and UE 104 may each include multiple antennas (such as antenna elements, antenna panels, and / or antenna arrays) to facilitate beamforming.

[0036] Base station 180 may transmit beamforming signals to UE 104 in one or more transmit directions 182'. UE 104 may receive beamforming signals from base station 180 in one or more receive directions 182'. UE 104 may also transmit beamforming signals to base station 180 in one or more transmit directions. Base station 180 may receive beamforming signals from UE 104 in one or more receive directions. Base station 180 / UE 104 may perform beam training to determine the optimal receive and transmit directions for each of base station 180 / UE 104. The transmit and receive directions for base station 180 may be the same or different. The transmit and receive directions for UE 104 may be the same or different.

[0037] The EPC 160 can 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 can be in communication with a home subscriber server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation as well as other functions. The PDN gateway 172 and the BM-SC 170 are connected to the IP services 176. The IP services 176 can include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, and / or other IP services. The BM-SC 170 can provide functions for MBMS user service provisioning and

[0038] The core network 190 can 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 can be in communication with a unified data management (UDM) 196. The AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred

[0039] A base station can include and / or be referred to as a gNB, NodeB, eNB, access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmit reception point (TRP), or some other suitable terminology. The base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104. Examples of UEs 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., 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 the UEs 104 can be referred to as IoT devices (e.g., a parking meter, gas pump, toaster, vehicle, heart monitor, etc.). The UE 104 can 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 communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0040] Referring again to Figure 1In certain aspects, the UE 104 can include a reception component 198 configured to transmit, to a base station, an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability for cell-specific reference signal (CRS) interference cancellation. The reception component 198 can also be configured to receive, from the base station, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells. The reception component 198 can also be configured to determine at least one of a location of at least one CRS or a sequence of the at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells, based on the received CRS assistance information. The reception component 198 can also be configured to identify the at least one CRS based on at least one of the location of the at least one CRS or the sequence of the at least one CRS. The reception component 198 can also be configured to measure one or more CRS corresponding to the one or more interfering cells, where the one or more CRS can include the at least one CRS, the one or more CRS being measured based on an interference cancellation threshold. The reception component 198 can also be configured to select the at least one CRS based on the interference cancellation threshold. The reception component 198 can also be configured to mitigate interference from the at least one CRS corresponding to the at least one interfering cell, the interference being mitigated based on at least one of the location of the at least one CRS or the sequence of the at least one CRS. The reception component 198 can also be configured to receive and decode a physical downlink shared channel (PDSCH) from the base station.

[0041] Referring again to Figure 1In certain aspects, the base station 180 can include a transmitting component 199 configured to receive, from a user equipment (UE), an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation. The transmitting component 199 can also be configured to configure CRS assistance information associated with the DSS. The transmitting component 199 can also be configured to transmit, to the UE, the CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells, the CRS assistance information including at least one of a location of at least one CRS or a sequence of the at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells. The transmitting component 199 can also be configured to encode and transmit a physical downlink shared channel (PDSCH) to the UE. The transmitting component 199 can also be configured to adjust or switch the at least one CRS based on a movement of the UE. The transmitting component 199 can also be configured to reconfigure the CRS assistance information via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) when adjusting or switching the at least one CRS.

[0042] Although the following description can be focused on 5G NR, the concepts described herein can be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0043] Figure 2A FIG. 2 is a diagram 200 illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2B FIG. 2 is a diagram 200 illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2C FIG. 2 is a diagram 200 illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2D FIG. 2 is a diagram 200 illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2A 、 2CIn the examples provided, a 5G / NR frame structure is assumed to be TDD with subframe 4 configured with slot format 28 (with mostly DL), where D is DL, U is UL, and F is flexible to use between DL / UL, and subframe 3 configured with slot format 1 (with all UL). While subframes 3, 4 are shown with slot formats 1, 28, respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. A UE is configured with a slot format (dynamically through DL control information (DCI), or semi- statically / statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI). Note that the following description also applies to a 5G / NR frame structure that is TDD.

[0044] Other wireless communication technologies can have different frame structures and / or different channels. A frame (10 ms) can be divided into 10 equally sized subframes (1 ms). Each subframe can include one or more slots. A subframe can also include mini-slots, which can contain 7, 4, or 2 symbols. Each slot can contain 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot can contain 14 symbols, and for slot configuration 1, each slot can contain 7 symbols. A symbol on the DL can be a cyclic prefix (CP) OFDM (CP-OFDM) symbol. A symbol on the UL can be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbol (also known as single carrier frequency division multiple access (SC-FDMA) symbol) (for power limited scenarios; limited to single stream transmission). The number of slots within a subframe can be slot configuration and numerology dependent. For slot configuration 0, different numerologies m0to 4allow for 1, 2, 4, 8, and 16 slots per subframe, respectively. For slot configuration 1, different numerologies 0 to 2allow for 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and numerology m, there are 14 symbols / slot and 2 μ slots / subframe. The subcarrier spacing and symbol length / duration are functions of the numerology. The subcarrier spacing can equal 2 μ * 15 kHz, where m is the numerology 0 to 4. Thus, numerology m = 0 has a subcarrier spacing of 15 kHz, and numerology m = 4 has a subcarrier spacing of 240 kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A-2DAn example of slot configuration 0 (with 14 symbols per slot) and numerology μ = 2 (with 4 slots per subframe) is provided. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Within a frame collection, there can be one or more different bandwidth parts (BWPs) (see Figure 2B ) that are frequency division multiplexed. Each BWP can have a particular numerology.

[0045] A resource grid can be used to represent the frame structure. Each time slot includes resource blocks (RBs) (also referred to as physical RBs (PRBs)), which are 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0046] As illustrated in Figure 2A , some of the REs carry reference (pilot) signals (RS) for the UE. The RS can include demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS can also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).

[0047] Figure 2BAn example of various DL channels are shown. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in one OFDM symbol of one RB. A PDCCH within one BWP can be referred to as a control resource set (CORESET). A UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during PDCCH monitoring occasions on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs can be located at greater and / or lower frequencies across the channel bandwidth. A primary synchronization signal (PSS) can be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe / symbol timing and physical layer identity. A secondary synchronization signal (SSS) can be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine locations of the aforementioned DM-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB) that provides system bandwidth configuration and scheduling information, can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as SS block (SSB)). 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 such as system information blocks (SIBs), and paging messages.

[0048] As illustrated in FIG. 2A, some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE can transmit DM-RS for channel estimation at the base station based on a configured number of front-loaded DM-RS. The UE transmits DM-RS in the first one or two symbols of each slot based on the configured number of front-loaded DM-RS. The UE can transmit additional DM-RS in other symbols in the slot based on a configured additional DM-RS pattern. The additional DM-RS can be used for channel estimation. The UE can transmit DM-RS in the last symbol of a slot. The DM-RS can be used by the base station for channel estimation to Figure 2C As illustrated in FIG. 2A, some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE can transmit DM-RS for channel estimation at the base station based on a configured number of front-loaded DM-RS. The UE transmits DM-RS in the first one or two symbols of each slot based on the configured number of front-loaded DM-RS. The UE can transmit additional DM-RS in other symbols in the slot based on a configured additional DM-RS pattern. The additional DM-RS can be used for channel estimation. The UE can transmit DM-RS in the last symbol of a slot. The DM-RS can be used by the base station for channel estimation to

[0049] Figure 2D An example of various UL channels is shown that are transmitted in a subframe. The PUCCH can be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) ACK / NACK feedback. The PUSCH carries data, and can additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0050] Figure 3 FIG. 13 is a diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from the EPC 160 can be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with, e.g., broadcasting of system information (e.g., MIB, SIBs), 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 functionality associated with, e.g., header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with, e.g., transfer of upper layer

[0051] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, can include error detection on the transport channels, forward error correction (FEC) coding / decoding of the transport channels, interleaving, rate matching, mapping to physical channels, modulation / demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols can then be split into parallel streams. Each stream can then be mapped to a OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and / or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 can be used to determine the coding and modulation schemes, as well as for spatial processing. The channel estimate can be derived from a reference signal and / or channel condition feedback transmitted by the UE 350. Each spatial stream can then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX can modulate a respective spatial stream onto an RF carrier

[0052] At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises 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 points transmitted by the base station 310. These soft decisions can be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functionality.

[0053] The controller / processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 can be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, 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.

[0054] Similar to the functionality described in connection with the DL transmission by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0055] Channel estimates derived by the channel estimator 358 from a reference signal or feedback transmitted by the base station 310 can 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 can be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX can modulate an RF carrier with a respective spatial stream for transmission.

[0056] The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function 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.

[0057] The controller / processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 can be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller / processor 375 can 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.

[0058] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects related to Figure 1

[0059] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 can be configured to perform aspects related to Figure 1

[0060] Some aspects of wireless communication can employ dynamic spectrum sharing (DSS), which can allow wireless network operators to use the same frequency band for different radio access technologies (RATs). The concept of DSS is based on a flexible design of the physical layer, such as a new radio (NR) physical layer. DSS can also be associated with the idea of certain signals (e.g., NR signals) being transmitted on unused resources (e.g., LTE resources). Wireless network operators can also leverage DSS as a way to evolve certain wireless networks (e.g., LTE networks) to support other wireless networks (e.g., 5G NR networks).

[0061] In some wireless communications (e.g., LTE communications), each channel in a channel can be statically assigned for each resource element in the time and frequency domain. In other wireless communications (e.g., NR communications), the physical layer can be flexible with respect to signals or channels (e.g., reference signals and / or data and control channels). By doing so, this can allow for dynamic configuration to minimize the likelihood of collisions between different communication technologies (e.g., LTE communications and NR communications).

[0062] ​​In some aspects of DSS, certain wireless communication users (e.g., 5G users) may be informed of the existence of DSS, while the functionality of other communication devices (e.g., LTE devices) may be unaffected, making these users unaware of DSS. In some cases, Cell-Specific Reference Signal (CRS) rate matching can be performed without using Multimedia Broadcast Single Frequency Network (MBSFN) subframes. In MBSFN subframes, the first two symbols of the subframe can be utilized in the LTE subframe, and the remaining symbols can be blank for LTE signals. By doing so, NR UEs can use the remaining symbols in the MBSFN for NR transmissions. However, this MBSFN subframe approach can result in significant overhead for LTE UEs.

[0063] In some cases, certain data channels (e.g., NR data channels) can be rate-matched based on Cell-Specific Reference Signal (CRS) rates in non-MBSFN subframes. In these cases, an LTE user can use the first two symbols of the subframe for a control channel or PDCCH, e.g., an LTE control channel or LTE PDCCH. Furthermore, the third symbol of the subframe can be used for another control channel, e.g., an NR control channel. And the fourth symbol of the subframe can be used for DM-RS for PDSCH, e.g., NR DM-RS for PDSCH. In these cases, the UE can perform puncturing on the REs used by the CRS (e.g., LTE CRS) so that the scheduler (e.g., the NR scheduler) can determine which REs are unavailable for data scheduling (e.g., NR data scheduling) on ​​the PDSCH.

[0064] Figure 4 This is a schematic diagram 400 illustrating an example non-Multimedia Broadcast Single Frequency Network (non-MBSFN) subframe (e.g., non-MBSFN subframe 402). Figure 4 The schematic diagram 400 includes multiple symbols and resource elements (REs) in subframe 402. For example, schematic diagram 400 includes LTE CRS port 410 (e.g., port 0), LTE CRS port 411 (e.g., port 1), LTE PDCCH 412, NRPDCCH area 414, NR DM-RS for PDSCH 416, and NR PDSCH 418.

[0065] like Figure 4 As shown, the first two symbols in subframe 402 can be used for the LTE control channel or PDCCH 412. The third symbol in subframe 402 can be used for the NR control channel or NR PDCCH area 414. Furthermore, the fourth symbol in subframe 402 can be used for NR DM-RS for PDSCH 416. In some cases, the LTE CRS RE can remain unchanged. For example... Figure 4As shown, the NR UE can perform puncturing of REs used for LTE CRS such that the NR scheduler can determine which REs are unavailable for NR data scheduling on PDSCH. Thus, NR PDSCH transmission can be performed on the remaining REs (e.g., non-LTE CRS REs) such that there can be no collision between LTE CRS REs and NR PDSCH.

[0066] In some aspects of wireless communication, interference from cell-specific reference signals (CRS) (e.g., LTE CRS) can degrade PDSCH decoding (e.g., NR PDSCH decoding). For example, LTE CRS interference can be detrimental to demodulation of NR PDSCH. In CRS hopping in certain wireless communications (e.g., LTE communications), CRS REs of a neighboring LTE cell can interfere with NR PDSCH and degrade NR PDSCH decoding performance. This has been determined in different field tests.

[0067] Figure 5A , Figure 5B and Figure 5C are diagrams 500, 530, and 560, respectively, illustrating example non-MBSFN subframes (e.g., a non-MBSFN subframe of serving cell 502, a non-MBSFN subframe of interfering cell 532, and a non-MBSFN subframe of interfering cell 562). Figure 5A , Figure 5B and Figure 5C include a number of symbols and REs, including LTE CRS port 510 (e.g., port 0), LTE CRS port 511 (e.g., port 1), LTE PDCCH 512, NR PDCCH region 514, NR DM-RS for PDSCH 516, NR PDSCH 518, and NR PDSCH REs interfered with by neighbor LTE CRS 520.

[0068] Figure 5A depicts a non-MBSFN subframe for serving cell 502. As shown in Figure 5A , the first two symbols in subframe 502 can be used for LTE control channels or PDCCH 512. The third symbol in subframe 502 can be used for NR control channels or NR PDCCH region 514. Further, the fourth symbol in subframe 502 can be used for NR DM-RS for PDSCH 516. Further, NR PDSCH REs interfered with by neighbor LTE CRS 520 can correspond to symbols 5, 8, and 12. As shown in Figure 5A , similar to Figure 4The NR UE can perform puncturing on the REs used by LTE CRS. By doing so, the NR scheduler can determine which REs are not available for NR data scheduling on the PDSCH.

[0069] Figure 5B The non-MBSFN subframe used for the first interfering cell 532 is shown. (See attached image.) Figure 5B As shown, LTE CRS ports 510 and 511 in subframe 532 are... Figure 5A There is an offset between LTE CRS ports 510 and 511 in subframe 502. For example, LTE CRS ports 510 and 511 are located in the second row of subframe 532 of the interfering cell, compared to the third row in subframe 502 of the serving cell. Therefore, the decoding performance of PDSCH may be reduced.

[0070] Figure 5C The non-MBSFN subframe used for the second interfering cell 562 is shown. (Example) Figure 5C As shown, LTE CRS ports 510 and 511 in subframe 562 are... Figure 5A There is an offset between LTE CRS ports 510 and 511 in subframe 502. For example, LTE CRS ports 510 and 511 are located in the first line of subframe 562 of the interfering cell, compared to the third line in subframe 502 of the serving cell. As noted above, this may degrade the decoding performance of PDSCH.

[0071] Additionally, in some cases, the transmitter can avoid CRS interference, or the receiver can remove it. Transmitter or base station technologies used to handle CRS interference can avoid REs by muting and / or rate matching the REs used for NR PDSCH. However, the overhead of muting REs can be significant and may degrade NR PDSCH performance. Furthermore, receiver or UE technologies may rely on UE processing to eliminate primary CRS interference. For example, UE interference processing can be performed via multiple radio access technologies (RATs) or inter-RAT CRS interference cancellation. As noted herein, inter-RAT communication can be associated with communication between LTE and NR technologies.

[0072] In some aspects of wireless communication (e.g., 5G NR communication), a UE can experience issues when implementing interference mitigation at a receiver. For example, an NR UE can experience increased UE complexity because the UE can have to measure every potential inter-RAT (e.g., LTE) CRS interference signal from a neighboring cell. Further, inter-RAT measurements can utilize an increased amount of time to complete interference measurements from each potential LTE interfering cell. For example, the UE can need to identify the LTE CRS pattern of each aggressor LTE cell. Further, the UE can need to decode PDSCH from the LTE cell to identify the physical cell ID and CRS ports and the CRS pattern.

[0073] Based on the above, it can be beneficial to provide novel procedures for CRS interference cancellation. It can also be beneficial for a UE (e.g., an NR UE) to inform a base station that the NR UE is capable of performing LTE CRS interference cancellation. For example, it can be beneficial to include LTE CRS interference cancellation as both inter-RAT and intra-frequency.

[0074] Aspects of the disclosure include novel procedures for CRS interference cancellation (e.g., LTE CRS interference cancellation). For example, aspects of the disclosure can include a UE reporting a UE capability (e.g., an NR UE capability) to a base station. The UE capability can inform the base station that the UE (e.g., an NR UE) is capable of performing CRS interference cancellation (e.g., LTE CRS interference cancellation) for PDSCH decoding (e.g., NR PDSCH decoding) in a DSS.

[0075] In some cases, aspects of the disclosure can utilize CRS interference cancellation as inter-RAT or utilize multiple RATs (e.g., LTE and NR). The CRS interference cancellation of the disclosure can also be intra-frequency. Thus, an NR UE can perform LTE CRS interference cancellation, which can be inter-RAT CRS interference cancellation. Aspects of the disclosure can also include signaling (e.g., NR signaling) for performing CRS interference cancellation (e.g., LTE CRS interference cancellation) in a DSS.

[0076] In some aspects, when the base station receives the UE capability report, the base station can transmit CRS assistance information (e.g., LTE CRS assistance information) of potential aggressor cells (e.g., LTE cells) to the UE (e.g., NR UE). By doing so, this can help the UE (e.g., NR UE) mitigate interference from CRS (e.g., LTE CRS) of aggressor RAT cells (e.g., LTE cells). For each interfering cell (e.g., LTE cell), multiple different CRS assistance information, e.g., LTE CRS assistance information, can be signaled to the UE. For example, the base station can signal to the UE the following: a physical cell identifier (ID) (PCI) (e.g., LTE PCI), a number of antenna ports of the CRS (e.g., LTE CRS), and / or a MBSFN subframe configuration (e.g., LTE MBSFN subframe configuration). Since the base station can indicate the MBSFN subframe configuration, the UE can identify which cell can not need to perform interference cancellation. For example, for the MBSFN subframe configuration, the indication of no collision between the CRS and PDSCH (e.g., LTE CRS and NR PDSCH) can reduce the complexity of the measurement calculation.

[0077] In some aspects, the UE (e.g., NR UE) can first determine the location and sequence of the interfering CRS (e.g., LTE CRS) based on the physical cell ID (e.g., physical LTE cell ID) and / or the number of CRS ports of each interfering cell (e.g., LTE cell). Thereafter, the UE can estimate the interfering signal and remove or subtract the interference from the received signal.

[0078] Additionally, the present disclosure can utilize MBSFN configuration (e.g., LTE MBSFN configuration) since no CRS, e.g., LTE CRS, can be transmitted in the data region of MBSFN subframes (e.g., LTE MBFN subframes). For example, the UE can not perform CRS interference cancellation in MBSFN subframes for PDSCH decoding, e.g., NR PDSCH decoding. Additionally, the CRS assistance information can be indicated semi-statically or dynamically by the base station. For example, the CRS assistance information (e.g., LTE CRS assistance information) can be semi-statically configured or reconfigured via RRC signaling (e.g., NR RRC signaling) or MAC-CE (e.g., NR MAC-CE). Further, the CRS assistance information can be dynamically indicated via layer 1 (L1) DCI signaling (e.g., NR L1 DCI signaling).

[0079] Figure 6 FIG. 6 is a diagram 600 illustrating example communications between a UE 602 and a base station 604.

[0080] At 610, the UE 602 can transmit, to a base station (e.g., base station 604), an interference indication (e.g., indication 614) associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation. At 612, the base station 604 can receive, from a UE (e.g., UE 602), an interference indication (e.g., indication 614) associated with DSS, the interference indication corresponding to a capability of CRS interference cancellation. In some cases, the DSS can be associated with inter-radio access technology (RAT) communications including a victim RAT and an aggressor RAT.

[0081] At 620, the base station 604 can configure CRS assistance information associated with DSS. At 630, the base station 604 can transmit, to a UE (e.g., UE 602), CRS assistance information (e.g., information 634) associated with DSS, the CRS assistance information corresponding to one or more interfering cells, the CRS assistance information including at least one of a location of at least one CRS or a sequence of at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells. At 632, the UE 602 can receive, from a base station (e.g., base station 604), CRS assistance information (e.g., information 634) associated with DSS, the CRS assistance information corresponding to one or more interfering cells. The CRS assistance information can be received via at least one of radio resource control (RRC) signaling, a medium access control (MAC) control element (MAC-CE), or downlink control information (DCI).

[0082] In some aspects, the CRS assistance information can include at least one of a physical cell identifier (ID), a number of antenna ports of at least one CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration. Further, at least one of the physical cell ID, the number of antenna ports of at least one CRS, or the MBSFN subframe configuration can be associated with an aggressor radio access technology (RAT). The at least one of the location of at least one CRS or the sequence of at least one CRS can be determined based on at least one of the physical cell ID or the number of antenna ports of at least one CRS.

[0083] At 640, the UE 602 can determine, based on the received CRS assistance information, at least one of the location of at least one CRS or the sequence of at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells.

[0084] At 642, the UE 602 can identify, based on at least one of the location of at least one CRS or the sequence of at least one CRS, the at least one CRS.

[0085] At 650, the UE 602 can measure one or more CRSs corresponding to one or more interfering cells, where the one or more CRSs can include at least one CRS, the one or more CRSs being measured based on an interference cancellation threshold.

[0086] At 652, the UE 602 can select at least one CRS based on the interference cancellation threshold.

[0087] At 660, the UE 602 can mitigate interference from at least one CRS corresponding to at least one interfering cell, the interference being mitigated based on at least one of a location of the at least one CRS or a sequence of the at least one CRS. In some cases, mitigating interference from the at least one CRS can include reducing or subtracting interference from the at least one CRS.

[0088] At 670, the base station 604 can encode and transmit a physical downlink shared channel (PDSCH) (e.g., PDSCH 674) to the UE. At 672, the UE 602 can receive and decode the PDSCH (e.g., PDSCH 674) from the base station. In some aspects, the mitigated interference from the at least one CRS can be associated with the encoded and / or decoded PDSCH. Further, in at least one multimedia broadcast single frequency network (MBSFN) subframe of the encoded and / or decoded PDSCH, the interference from the at least one CRS can not be mitigated.

[0089] At 680, the base station 604 can adjust or switch the at least one CRS based on movement of the UE (e.g., UE 602). In some cases, the at least one CRS can be adjusted or switched based on movement of the UE.

[0090] At 690, the base station 604 can reconfigure CRS assistance information via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) when adjusting or switching the at least one CRS. Further, the CRS assistance information can be reconfigured via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) when adjusting or switching the at least one CRS.

[0091] Figure 7is a flowchart 700 of a method of wireless communication. The method can be performed by a UE or a component of a UE (e.g., the UE 104, 350, 602; the apparatus 902; the processing system, which can include the memory 360 and which can be the entire UE or a component of the UE, such as the TX processor 368, the controller / processor 359, the transmitter 354 TX, the antenna 352, etc.). Optional aspects are illustrated with a dashed line. The methods described herein can provide a number of benefits, such as improved communication signaling, resource utilization, and / or power savings.

[0092] At 702, the apparatus can transmit, to a base station, an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability for cell-specific reference signal (CRS) interference cancellation, as described in connection with the examples in Figure 4 、 5A , 5B, 5C, and 6. For example, 702 can be performed by the determining component 940. In some cases, the DSS can be associated with inter-radio access technology (RAT) communications including a victim RAT and an aggressor RAT, as described in connection with the examples in Figure 4 、 5A , 5B, 5C, and 6.

[0093] At 704, the apparatus can receive, from the base station, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells, as described in connection with the examples in Figure 4 、 5A , 5B, 5C, and 6. For example, 704 can be performed by the determining component 940. The CRS assistance information can be received via at least one of radio resource control (RRC) signaling, a medium access control (MAC) control element (MAC-CE), or downlink control information (DCI), as described in connection with the examples in Figure 4 、 5A , 5B, 5C, and 6.

[0094] In some aspects, the CRS assistance information can include at least one of a physical cell identifier (ID), a number of antenna ports for at least one CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration, as described in connection with the examples in Figure 4 、 5A , 5B, 5C, and 6. Additionally, the at least one of the physical cell ID, the number of antenna ports for the at least one CRS, or the MBSFN subframe configuration can be associated with an aggressor radio access technology (RAT), as described in connection with the examples in Figure 4 、 5Adescribed in connection with the examples of FIGS. 5B, 5C, and 6. The at least one of the location of the at least one CRS or the sequence of the at least one CRS can be determined based on at least one of a physical cell ID or a number of antenna ports of the at least one CRS, as described in connection with the examples of FIGS. 5B, 5C, and 6. Figure 4 , 5A described in connection with the examples of FIGS. 5B, 5C, and 6.

[0095] At 706, the apparatus can also determine, based on the received CRS assistance information, at least one of a location of the at least one CRS or a sequence of the at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells, as described in connection with the examples of FIGS. 5B, 5C, and 6. For example, 706 can be performed by the determining component 940. Figure 4 , 5A described in connection with the examples of FIGS. 5B, 5C, and 6.

[0096] At 708, the apparatus can identify the at least one CRS based on the at least one of the location of the at least one CRS or the sequence of the at least one CRS, as described in connection with the examples of FIGS. 5B, 5C, and 6. For example, 708 can be performed by the determining component 940. Figure 4 , 5A described in connection with the examples of FIGS. 5B, 5C, and 6.

[0097] At 710, the apparatus can also measure one or more CRSs corresponding to the one or more interfering cells, wherein the one or more CRSs can include the at least one CRS, the one or more CRSs being measured based on an interference cancellation threshold, as described in connection with the examples of FIGS. 5B, 5C, and 6. For example, 710 can be performed by the determining component 940. Figure 4 , 5A described in connection with the examples of FIGS. 5B, 5C, and 6.

[0098] At 712, the apparatus can select the at least one CRS based on the interference cancellation threshold, as described in connection with the examples of FIGS. 5B, 5C, and 6. For example, 712 can be performed by the determining component 940. Figure 4 , 5A described in connection with the examples of FIGS. 5B, 5C, and 6.

[0099] At 714, the apparatus can mitigate interference from the at least one CRS corresponding to the at least one interfering cell, the interference being mitigated based on the at least one of the location of the at least one CRS or the sequence of the at least one CRS, as described in connection with the examples of FIGS. 5B, 5C, and 6. For example, 714 can be performed by the determining component 940. In some cases, mitigating the interference from the at least one CRS can include reducing or subtracting the interference from the at least one CRS, as described in connection with the examples of FIGS. 5B, 5C, and 6. Figure 4 , 5A described in connection with the examples of FIGS. 5B, 5C, and 6. Figure 4 , 5Aas described in the examples of FIGs. 5B, 5C, and 6.

[0100] At 716, the apparatus can receive and decode a PDSCH from the base station as described in the examples of FIGs. 5B, 5C, and 6. For example, 716 can be performed by the determining component 940. In some aspects, mitigated interference from the at least one CRS can be associated with the decoded PDSCH as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A At 716, the apparatus can receive and decode a PDSCH from the base station as described in the examples of FIGs. 5B, 5C, and 6. For example, 716 can be performed by the determining component 940. In some aspects, mitigated interference from the at least one CRS can be associated with the decoded PDSCH as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A At 716, the apparatus can receive and decode a PDSCH from the base station as described in the examples of FIGs. 5B, 5C, and 6. For example, 716 can be performed by the determining component 940. In some aspects, mitigated interference from the at least one CRS can be associated with the decoded PDSCH as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A At 716, the apparatus can receive and decode a PDSCH from the base station as described in the examples of FIGs. 5B, 5C, and 6. For example, 716 can be performed by the determining component 940. In some aspects, mitigated interference from the at least one CRS can be associated with the decoded PDSCH as described in the examples of FIGs. 5B, 5C, and 6.

[0101] In some cases, the at least one CRS can be adjusted or switched based on movement of the UE as described in the examples of FIGs. 5B, 5C, and 6. Further, when the at least one CRS is adjusted or switched, CRS assistance information can be reconfigured via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A In some cases, the at least one CRS can be adjusted or switched based on movement of the UE as described in the examples of FIGs. 5B, 5C, and 6. Further, when the at least one CRS is adjusted or switched, CRS assistance information can be reconfigured via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) as described in the examples of FIGs. 5B, 5C, and 6. Figure 8 5A In some cases, the at least one CRS can be adjusted or switched based on movement of the UE as described in the examples of FIGs. 5B, 5C, and 6. Further, when the at least one CRS is adjusted or switched, CRS assistance information can be reconfigured via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) as described in the examples of FIGs. 5B, 5C, and 6.

[0102] Figure 4 is a flow diagram of a method of wireless communication. The method can be performed by a base station or a component of a base station (e.g., the base station 102, 180, 310, 604; the apparatus 1002; the processing system, which can include the memory 376 and which can be the entire base station or a component of the base station, such as the antennas 320, the receiver 318RX, the RX processor 370, the controller / processor 375, etc.). Optional aspects are illustrated with a dashed line. The methodologies described herein can provide a number of benefits, for example, improved communication signaling, resource utilization, and / or power savings.

[0103] At 802, the apparatus can receive, from a UE, an interference indication associated with a DSS, the interference indication corresponding to a capability for cell-specific reference signal (CRS) interference cancellation as described in the examples of FIGs. 5B, 5C, and 6. For example, 802 can be performed by the determining component 1040. The DSS can be associated with inter-radio access technology (RAT) communications including a victim RAT and an aggressor RAT as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A At 802, the apparatus can receive, from a UE, an interference indication associated with a DSS, the interference indication corresponding to a capability for cell-specific reference signal (CRS) interference cancellation as described in the examples of FIGs. 5B, 5C, and 6. For example, 802 can be performed by the determining component 1040. The DSS can be associated with inter-radio access technology (RAT) communications including a victim RAT and an aggressor RAT as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 ,​​​​​​5A as described in the examples of FIGs. 5B, 5C, and 6.

[0104] At 804, the apparatus can configure CRS assistance information associated with the DSS, as described in the examples of FIGs. 5B, 5C, and 6. For example, 804 can be performed by the determining component 1040. In some aspects, the CRS assistance information can include at least one of a physical cell identifier (ID), a number of antenna ports for at least one CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration, as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A as described in the examples of FIGs. 5B, 5C, and 6. For example, 804 can be performed by the determining component 1040. In some aspects, the CRS assistance information can include at least one of a physical cell identifier (ID), a number of antenna ports for at least one CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration, as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A as described in the examples of FIGs. 5B, 5C, and 6. For example, 804 can be performed by the determining component 1040. In some aspects, the CRS assistance information can include at least one of a physical cell identifier (ID), a number of antenna ports for at least one CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration, as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A as described in the examples of FIGs. 5B, 5C, and 6. For example, 804 can be performed by the determining component 1040. In some aspects, the CRS assistance information can include at least one of a physical cell identifier (ID), a number of antenna ports for at least one CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration, as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A as described in the examples of FIGs. 5B, 5C, and 6. For example, 804 can be performed by the determining component 1040. In some aspects, the CRS assistance information can include at least one of a physical cell identifier (ID), a number of antenna ports for at least one CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration, as described in the examples of FIGs. 5B, 5C, and 6.

[0105] At 806, the apparatus can also transmit, to a UE, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells, the CRS assistance information including at least one of a location of at least one CRS or a sequence of at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells, as described in the examples of FIGs. 5B, 5C, and 6. For example, 806 can be performed by the determining component 1040. The CRS assistance information can be transmitted via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI), as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A as described in the examples of FIGs. 5B, 5C, and 6. For example, 806 can be performed by the determining component 1040. The CRS assistance information can be transmitted via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI), as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A as described in the examples of FIGs. 5B, 5C, and 6. For example, 806 can be performed by the determining component 1040. The CRS assistance information can be transmitted via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI), as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A as described in the examples of FIGs. 5B, 5C, and 6. For example, 806 can be performed by the determining component 1040. The CRS assistance information can be transmitted via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI), as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A ​​​​​​​​as described in the examples of FIGs. 5B, 5C, and 6.

[0106] At 808, the apparatus can encode and transmit a physical downlink shared channel (PDSCH) to the UE as described in the examples of FIGs. 5B, 5C, and 6. For example, 808 can be performed by the determining component 1040. The mitigated interference from the at least one CRS can be associated with the encoded PDSCH as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A At 808, the apparatus can encode and transmit a physical downlink shared channel (PDSCH) to the UE as described in the examples of FIGs. 5B, 5C, and 6. For example, 808 can be performed by the determining component 1040. The mitigated interference from the at least one CRS can be associated with the encoded PDSCH as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A At 808, the apparatus can encode and transmit a physical downlink shared channel (PDSCH) to the UE as described in the examples of FIGs. 5B, 5C, and 6. For example, 808 can be performed by the determining component 1040. The mitigated interference from the at least one CRS can be associated with the encoded PDSCH as described in the examples of FIGs. 5B, 5C, and 6. Figure 4 5A In some aspects, the one or more CRS can be measured based on an interference cancellation threshold, the one or more CRS corresponding to one or more interfering cells, the one or more CRS including the at least one CRS as described in the examples of FIGs. 5B, 5C, and 6. For example, 808 can be performed by the determining component 1040. Figure 9 5A At 808, the apparatus can encode and transmit a physical downlink shared channel (PDSCH) to the UE as described in the examples of FIGs. 5B, 5C, and 6. For example, 808 can be performed by the determining component 1040. The mitigated interference from the at least one CRS can be associated with the encoded PDSCH as described in the examples of FIGs. 5B, 5C, and 6.

[0107] At 810, the apparatus can adjust or switch the at least one CRS based on movement of the UE as described in the examples of FIGs. 5B, 5C, and 6. For example, 810 can be performed by the determining component 1040. Figure 3 5A At 810, the apparatus can adjust or switch the at least one CRS based on movement of the UE as described in the examples of FIGs. 5B, 5C, and 6. For example, 810 can be performed by the determining component 1040.

[0108] At 812, the apparatus can reconfigure CRS assistance information via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) when adjusting or switching the at least one CRS as described in the examples of FIGs. 5B, 5C, and 6. For example, 812 can be performed by the determining component 1040. Figure 6 5A At 812, the apparatus can reconfigure CRS assistance information via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) when adjusting or switching the at least one CRS as described in the examples of FIGs. 5B, 5C, and 6. For example, 812 can be performed by the determining component 1040.

[0109] Figure 7 ​​​​​​is a diagram 900 illustrating an example of a hardware implementation for the apparatus 902. The apparatus 902 is a UE and includes a cellular baseband processor 904 (also referred to as a modem) coupled with a cellular RF transceiver 922, one or more Subscriber Identity Modules (SIM) cards 920, an application processor 906 coupled with a secure digital (SD) card 908 and a screen 910, a Bluetooth module 912, a wireless local area network (WLAN) module 914, a Global Positioning System (GPS) module 916, and a power source 918. The cellular baseband processor 904 communicates with the UE 104 and / or BS 102 / 180 by way of the cellular RF transceiver 922. The cellular baseband processor 904 can include a computer-readable medium / memory. The computer-readable medium / memory can be non-transitory. The cellular baseband processor 904 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the cellular baseband processor 904, causes the cellular baseband processor 904 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the cellular baseband processor 904 when executing software. The cellular baseband processor 904 further includes a reception component 930, a communication manager 932, and a transmission component 934. The communication manager 932 includes the one or more illustrated components. The components of the communication manager 932 can be stored in the computer-readable medium / memory and / or configured as hardware within the cellular baseband processor 904. The cellular baseband processor 904 can be a component of the UE 350 and can include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the apparatus 902 can be a modem chip and include only the baseband processor 904, and in another configuration, the apparatus 902 can be an entire UE (e.g., see 350) and include the above-described additional modules of the apparatus 902. Figure 6

[0110] ​The communications manager 932 includes a determining component 940 configured to transmit, to a base station, an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability for cell-specific reference signal (CRS) interference cancellation, e.g., as described above in connection with step 702. The determining component 940 can also be configured to receive, from the base station, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells, e.g., as described above in connection with step 704. The determining component 940 can also be configured to determine at least one of a location of at least one CRS or a sequence of the at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells, based on the received CRS assistance information, e.g., as described above in connection with step 706. The determining component 940 can also be configured to mitigate interference from the at least one CRS corresponding to the at least one interfering cell, the interference being mitigated based on at least one of the location of the at least one CRS or the sequence of the at least one CRS, e.g., as described above in connection with step 714.

[0111] The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 10. As such, each block in the aforementioned flowchart of FIG. 10 can be performed by a component and the apparatus can include one or more of those components. The components can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by a processor configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. Figure 7 Figure 10 The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 10. As such, each block in the aforementioned flowchart of FIG. 10 can be performed by a component and the apparatus can include one or more of those components. The components can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by a processor configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. Figure 6 Figure 8 The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 10. As such, each block in the aforementioned flowchart of FIG. 10 can be performed by a component and the apparatus can include one or more of those components. The components can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by a processor configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.

[0112] ​​In one configuration, the apparatus 902 (and in particular, the cellular baseband processor 904) includes means for transmitting, to a base station, an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation. The apparatus 902 can further include means for receiving, from the base station, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells. The apparatus 902 can further include means for determining at least one of a location of at least one CRS or a sequence of the at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells, based on the received CRS assistance information. The apparatus 902 can further include means for mitigating interference from the at least one CRS corresponding to the at least one interfering cell, the interference being mitigated based on at least one of the location of the at least one CRS or the sequence of the at least one CRS. The aforementioned means can be one or more of the aforementioned components of the apparatus 902 configured to perform the functions recited by the aforementioned means. As described supra, the apparatus 902 can include the TX processor 368, the RX processor 356, and the controller / processor 359. As such, in one configuration, the aforementioned means can be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the aforementioned means.

[0113] Figure 6 FIG. 1000 is a diagram 1000 illustrating an example of a hardware implementation for an apparatus 1002. The apparatus 1002 is a base station and includes a baseband unit 1004. The baseband unit 1004 can communicate with the UE 104 through a cellular RF transceiver. The baseband unit 1004 can include a computer-readable medium / memory. The baseband unit 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband unit 1004, causes the baseband unit 1004 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the baseband unit 1004 when executing software. The baseband unit 1004 further includes a reception component 1030, a communication manager 1032, and a transmission component 1034. The communication manager 1032 includes the one or more illustrated components. The components of the communication manager 1032 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband unit 1004. The baseband unit 1004 can be a component of the BS 310 and can include the memory 376 and / or at least one of the TX processor 316, the RX processor 370, and the controller / processor 375.

[0114] Communication manager 1032 includes a determining component 1040 configured to receive from the UE an interference indication associated with Dynamic Spectrum Sharing (DSS), the interference indication corresponding to the capability of Cell-Specific Reference Signal (CRS) interference cancellation, for example, as described above in conjunction with step 802. Determining component 1040 may also be configured to send to the UE CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells, the CRS assistance information including at least one location of at least one CRS or at least one sequence of at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells, for example, as described above in conjunction with step 806.

[0115] The device may include execution Figure 8 and ​ The algorithm in the flowchart above consists of additional components in each box. Therefore, it can be executed by the components. ​ and ​ Each box in the above flowchart, and the apparatus may include one or more of those components. A component may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0116] In one configuration, apparatus 1002 (specifically, baseband unit 1004) includes a unit for receiving from a UE an interference indication associated with Dynamic Spectrum Sharing (DSS), the interference indication corresponding to the capability of Cell-Specific Reference Signal (CRS) interference cancellation. Apparatus 1002 may further include a unit for transmitting to the UE CRS auxiliary information associated with the DSS, the CRS auxiliary information corresponding to one or more interfering cells, the CRS auxiliary information including at least one of the locations of at least one CRS or a sequence of at least one CRS, the at least one CRS corresponding to at least one of the one or more interfering cells. The aforementioned unit may be one or more components of apparatus 1002 configured to perform the functions described above. As described above, apparatus 1002 may include a TX processor 316, an RX processor 370, and a controller / processor 375. Therefore, in one configuration, the aforementioned unit may be the TX processor 316, the RX processor 370, and the controller / processor 375 configured to perform the functions described above.

[0117] It is to be understood that the specific order or hierarchy of steps in the processes / flow diagrams disclosed is an illustration of example processes. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes / flow diagrams can be re-arranged, or some steps can be combined, or omitted. Further, some steps can be performed simultaneously or in an order different from that presented herein. The accompanying method claims perform the functions described by the elements of the various steps in the specification. Accordingly, the exemplary order or hierarchy of steps in the claims is intended to be construed to afford additional flexibility to support a wide variety of possible implementations.

[0118] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more." The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, 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 the group consisting of A, B, and C," "one or more of the group consisting of A, B, and C," and the like encompasses the combination of A alone, B alone, C alone, A and B together, A and C together, B and C together, or A and B and C together. Specifically, the combination "at least one of A, B, or C" encompasses the combinations of A alone, B alone, C alone, A and B together, A and C together, B and C together, or A and B and C together. The term "a set" as used herein refers to one or more. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and intended to be encompassed by the claims. Moreover, nothing that has been stated or disclosed is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words "module," "mechanism," "element," "device," and the like can not be a substitute for the word "means." As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase "means for."

Claims

1. A method of wireless communication at a user equipment (UE), comprising: transmitting, to a base station, an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation, wherein the DSS is associated with inter-radio access technology (RAT) communications, the inter-RAT communications including a victim RAT and an aggressor RAT; receiving, from the base station, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells; determining at least one of a location of at least one interfering CRS or a sequence of the at least one interfering CRS, the at least one interfering CRS corresponding to at least one interfering cell of the one or more interfering cells, based on the received CRS assistance information; mitigating interference from the at least one interfering CRS corresponding to the at least one interfering cell, the interference mitigated based on at least one of the location of the at least one interfering CRS or the sequence of the at least one interfering CRS; and receiving and decoding a physical downlink shared channel (PDSCH) from the base station; wherein the mitigated interference from the at least one interfering CRS is associated with the decoded PDSCH, the interference from the at least one interfering CRS not mitigated in at least one multimedia broadcast single frequency network (MBSFN) subframe of the decoded PDSCH.

2. An apparatus for wireless communication at a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: transmit, to a base station, an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation, wherein the DSS is associated with inter-radio access technology (RAT) communications, the inter-RAT communications including a victim RAT and an aggressor RAT; receive, from the base station, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells; determine at least one of a location of at least one interfering CRS or a sequence of the at least one interfering CRS, the at least one interfering CRS corresponding to at least one interfering cell of the one or more interfering cells, based on the received CRS assistance information; mitigate interference from the at least one interfering CRS corresponding to the at least one interfering cell, the interference mitigated based on at least one of the location of the at least one interfering CRS or the sequence of the at least one interfering CRS; receive and decode a physical downlink shared channel (PDSCH) from the base station, wherein the mitigated interference from the at least one interfering CRS is associated with the decoded PDSCH, the interference from the at least one interfering CRS not mitigated in at least one multimedia broadcast single frequency network (MBSFN) subframe of the decoded PDSCH.

3. The apparatus of claim 2, wherein, The CRS assistance information includes at least one of a physical cell identifier (ID), a number of antenna ports of the at least one interfering CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration.

4. The apparatus of claim 3, wherein, The at least one of the physical cell ID, the number of antenna ports of the at least one interfering CRS, or the MBSFN subframe configuration is associated with an aggressor radio access technology (RAT).

5. The apparatus of claim 3, wherein, The at least one of the location of the at least one interfering CRS or the sequence of the at least one interfering CRS is determined based on at least one of the physical cell ID or the number of antenna ports of the at least one interfering CRS.

6. The apparatus of claim 2, wherein, The at least one processor is further configured to: identify the at least one interfering CRS based on at least one of the location of the at least one interfering CRS or the sequence of the at least one interfering CRS.

7. The apparatus of claim 2, wherein, Mitigating the interference from the at least one interfering CRS includes reducing or subtracting the interference from the at least one interfering CRS.

8. The apparatus of claim 2, wherein, The at least one processor is further configured to: measure one or more interfering CRSs corresponding to the one or more interfering cells, wherein the one or more interfering CRSs include the at least one interfering CRS, the one or more interfering CRSs are measured based on an interference cancellation threshold.

9. The apparatus of claim 8, wherein, The at least one processor is further configured to: select the at least one interfering CRS based on the interference cancellation threshold.

10. The apparatus of claim 2, wherein, The CRS assistance information is received via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI).

11. The apparatus of claim 2, wherein, The at least one interfering CRS is adjusted or switched based on movement of the UE.

12. The apparatus of claim 11, wherein, The CRS assistance information is reconfigured via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) when the at least one interfering CRS is adjusted or switched.

13. An apparatus for wireless communication at a user equipment (UE), comprising: means for transmitting, to a base station, an interference indication associated with dynamic spectrum sharing (DSS), the interference indication corresponding to a capability for cell-specific reference signal (CRS) interference cancellation, wherein the DSS is associated with inter-radio access technology (RAT) communications, the inter-RAT communications including a victim RAT and an aggressor RAT; means for receiving, from the base station, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells; means for determining at least one of a location of at least one interfering CRS or a sequence of the at least one interfering CRS based on the received CRS assistance information, the at least one interfering CRS corresponding to at least one of the one or more interfering cells; and means for mitigating the interference from the at least one interfering CRS. means for mitigating interference from the at least one interfering CRS, the interference being mitigated based on at least one of the location of the at least one interfering CRS or the sequence of the at least one interfering CRS; and means for receiving and decoding a physical downlink shared channel (PDSCH) from the base station; wherein the mitigated interference from the at least one interfering CRS is associated with the decoded PDSCH, the interference from the at least one interfering CRS not being mitigated in at least one multimedia broadcast single frequency network (MBSFN) subframe of the decoded PDSCH.

14. A method of wireless communication at a base station, comprising: receiving, from a user equipment (UE), an interference indication associated with a dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation, wherein the DSS is associated with inter-radio access technology (RAT) communications, the inter-RAT communications including a victim RAT and an aggressor RAT; and transmitting, to the UE, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells, the CRS assistance information including at least one of a location of at least one interfering CRS or a sequence of the at least one interfering CRS, the at least one interfering CRS corresponding to at least one of the one or more interfering cells; encoding and transmitting a physical downlink shared channel (PDSCH) to the UE; wherein interference from the at least one interfering CRS is mitigated based on at least one of the location of the at least one interfering CRS or the sequence of the at least one interfering CRS; and wherein the mitigated interference from the at least one interfering CRS is associated with the encoded PDSCH, the interference from the at least one interfering CRS not being mitigated in at least one multimedia broadcast single frequency network (MBSFN) subframe of the encoded PDSCH.

15. An apparatus for wireless communication at a base station, comprising: a memory; and at least one processor coupled to the memory and configured to: receive, from a user equipment (UE), an interference indication associated with a dynamic spectrum sharing (DSS), the interference indication corresponding to a capability of cell-specific reference signal (CRS) interference cancellation, wherein the DSS is associated with inter-radio access technology (RAT) communications, the inter-RAT communications including a victim RAT and an aggressor RAT; and transmit, to the UE, CRS assistance information associated with the DSS, the CRS assistance information corresponding to one or more interfering cells, the CRS assistance information including at least one of a location of at least one interfering CRS or a sequence of the at least one interfering CRS, the at least one interfering CRS corresponding to at least one of the one or more interfering cells; encoding and transmitting a physical downlink shared channel (PDSCH) to the UE; wherein interference from the at least one interfering CRS is mitigated based on at least one of the location of the at least one interfering CRS or the sequence of the at least one interfering CRS; and wherein the mitigated interference from the at least one interfering CRS is associated with the encoded PDSCH, the interference from the at least one interfering CRS not being mitigated in at least one multimedia broadcast single frequency network (MBSFN) subframe of the encoded PDSCH.

16. The apparatus of claim 15, wherein, the CRS assistance information comprises at least one of a physical cell identifier (ID), a number of antenna ports of the at least one interfering CRS, or a multimedia broadcast single frequency network (MBSFN) subframe configuration.

17. The apparatus of claim 16, wherein, at least one of the physical cell ID, the number of antenna ports of the at least one interfering CRS, or the MBSFN subframe configuration is associated with an aggressor radio access technology (RAT).

18. The apparatus of claim 16, wherein, at least one of the location of the at least one interfering CRS or the sequence of the at least one interfering CRS is based on at least one of the physical cell ID or the number of antenna ports of the at least one interfering CRS.

19. The apparatus of claim 15, wherein, the mitigated interference from the at least one interfering CRS comprises reduced or subtracted interference from the at least one interfering CRS.

20. The apparatus of claim 15, wherein, the one or more interfering CRSs are measured based on an interference cancellation threshold, the one or more interfering CRSs corresponding to the one or more interfering cells, the one or more interfering CRSs including the at least one interfering CRS.

21. The apparatus of claim 15, wherein, the at least one processor is further configured to: configure the CRS assistance information associated with the DSS.

22. The apparatus of claim 15, wherein, the CRS assistance information is transmitted via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI).

23. The apparatus of claim 15, wherein, the at least one processor is further configured to: adjust or switch the at least one interfering CRS based on movement of the UE.

24. The apparatus of claim 23, wherein, the at least one processor is further configured to: reconfigure the CRS assistance information via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (MAC-CE), or downlink control information (DCI) when adjusting or switching the at least one interfering CRS.

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