Avoiding conflicts with reference signals

Abstract

The invention relates to avoiding collisions with reference signals. Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive a configuration of semi-persistent scheduling (SPS) for data transmissions that rate matches the data transmissions around one or more resource elements to be used for cell-specific reference signal patterns. The UE may receive the SPS communication based at least in part on the configuration. Numerous other aspects are provided.

Description

[0001] This patent application is a divisional application of the Chinese patent application No. 202080073058.2, entitled "Avoiding Collisions with Reference Signals", and the international application No. PCT / US2020 / 070684, which was filed on October 22, 2020.

[0002] Cross - Reference to Related Applications

[0003] This patent application claims the priority of the US Provisional Patent Application No. 62 / 925,209, entitled "AVOIDING COLLISIONS WITH REFERENCE SIGNALS", filed on October 23, 2019, and the US Non-Provisional Patent Application No. 16 / 949,247, entitled "AVOIDING COLLISIONS WITH REFERENCE SIGNALS", filed on October 21, 2020. These applications are hereby incorporated by reference in their entirety. TECHNICAL FIELD

[0004] Aspects of the present disclosure generally relate to wireless communication, and more particularly, to techniques and apparatuses for avoiding collisions with reference signals. BACKGROUND OF THE DISCLOSURE

[0005] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ a multiple access technology that is capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / Advanced LTE is an enhanced set of the universal mobile telecommunications system (UMTS) mobile standards promulgated by the 3rd Generation Partnership Project (3GPP).

[0006] A wireless communication network may include several base stations (BSs) capable of supporting communication of several user equipments (UEs). A user equipment (UE) may communicate with a base station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmission reception point (TRP), new radio (NR) BS, 5G Node B, and so on.

[0007] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipments to communicate at the city, national, regional, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhanced set of the LTE mobile standard promulgated by the 3rd Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrums, and using Orthogonal Frequency Division Multiplexing with Cyclic Prefix (CP-OFDM) on the downlink (DL), CP-OFDM and / or SC-FDM (e.g., also referred to as Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, Multiple-Input Multiple-Output (MIMO) antenna technology, and carrier aggregation to better integrate with other open standards. However, as the demand for mobile broadband access continues to grow, there is a need for further improvement in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies. Summary of the Invention

[0008] In some aspects, a wireless communication method performed by a User Equipment (UE) includes: receiving a configuration for Semi-Persistent Scheduling (SPS) for data transmission, the configuration rate-matching the data transmission around one or more resource elements to be used for a Cell-Specific Reference Signal (CRS) pattern; and receiving SPS communication at least in part based on the configuration.

[0009] In some aspects, a wireless communication method performed by a base station may include: determining one or more resource elements to be used for a CRS pattern; determining a configuration for SPS for data transmission to a UE, the configuration rate-matching the data transmission around the one or more resource elements of the CRS pattern; and transmitting the configuration to the UE.

[0010] In some aspects, a wireless communication method performed by a UE may include: receiving control information that schedules a first Demodulation Reference Signal (DMRS) associated with a downlink data transmission to avoid a conflict with CRS in one or more first resource elements; determining at least in part based on the control information a potential conflict between the CRS and a second DMRS associated with SPS of the data transmission in the one or more first resource elements; determining at least in part based on the potential conflict that the second DMRS is to be received in one or more second resource elements; and receiving the second DMRS in the one or more second resource elements.

[0011] In some aspects, a wireless communication method performed by a base station may include: determining that a first DMRS associated with downlink data transmission is scheduled to avoid a conflict with CRS in one or more first resource elements; determining a potential conflict between the CRS and a second DMRS associated with SPS of the data transmission in the one or more first resource elements; and transmitting the second DMRS in one or more second resource elements at least partially based on the potential conflict.

[0012] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive a configuration of SPS for data transmission, the configuration rate matching the data transmission around one or more resource elements to be used for a CRS pattern; and receive SPS communication at least partially based on the configuration.

[0013] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: determine one or more resource elements to be used for a CRS pattern; determine a configuration of SPS for data transmission to a UE, the configuration rate matching the data transmission around the one or more resource elements of the CRS pattern; and transmit the configuration to the UE.

[0014] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive control information that schedules a first DMRS associated with downlink data transmission to avoid a conflict with CRS in one or more first resource elements; determine at least partially based on the control information a potential conflict between the CRS and a second DMRS associated with SPS of the data transmission in the one or more first resource elements; determine at least partially based on the potential conflict that the second DMRS is to be received in one or more second resource elements; and receive the second DMRS in the one or more second resource elements.

[0015] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: determine that a first DMRS associated with downlink data transmission is scheduled to avoid a conflict with CRS in one or more first resource elements; determine a potential conflict between the CRS and a second DMRS associated with SPS of the data transmission in the one or more first resource elements; and transmit the second DMRS in one or more second resource elements at least partially based on the potential conflict.

[0016] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a UE, the one or more instructions may cause the one or more processors to: receive a configuration of SPS for data transmission, the configuration rate matching the data transmission around one or more resource elements to be used for a CRS mode; and receive SPS communication at least in part based on the configuration.

[0017] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a base station, the one or more instructions may cause the one or more processors to: determine one or more resource elements to be used for a CRS mode; determine a configuration of SPS for data transmission to a UE, the configuration rate matching the data transmission around the one or more resource elements of the CRS mode; and transmit the configuration to the UE.

[0018] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a UE, the one or more instructions may cause the one or more processors to: receive control information that schedules a first DMRS associated with downlink data transmission to avoid a conflict with CRS in one or more first resource elements; determine a potential conflict between the CRS and a second DMRS associated with SPS of the data transmission in the one or more first resource elements at least in part based on the control information; determine that the second DMRS is to be received in one or more second resource elements at least in part based on the potential conflict; and receive the second DMRS in the one or more second resource elements.

[0019] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a base station, the one or more instructions may cause the one or more processors to: determine that a first DMRS associated with downlink data transmission is scheduled to avoid a conflict with CRS in one or more first resource elements; determine a potential conflict between the CRS and a second DMRS associated with SPS of the data transmission in the one or more first resource elements; and transmit the second DMRS in one or more second resource elements at least in part based on the potential conflict.

[0020] In some aspects, a device for wireless communication may include: means for receiving a configuration of a SPS for data transmission, the configuration rate matching the data transmission around one or more resource elements to be used for a CRS mode; and means for receiving SPS communication at least in part based on the configuration.

[0021] In some aspects, a device for wireless communication may include: means for determining one or more resource elements to be used for a CRS mode; means for determining a configuration of a SPS for data transmission to a UE, the configuration rate matching the data transmission around the one or more resource elements of the CRS mode; and means for conveying the configuration to the UE.

[0022] In some aspects, a device for wireless communication may include: means for receiving control information that schedules a first DMRS associated with a downlink data transmission to avoid a conflict with CRS in one or more first resource elements; means for determining a potential conflict between the CRS and a second DMRS associated with a SPS of the data transmission in at least in part based on the control information; means for determining that the second DMRS is to be received in one or more second resource elements at least in part based on the potential conflict; and means for receiving the second DMRS in the one or more second resource elements.

[0023] In some aspects, a device for wireless communication may include: means for determining that a first DMRS associated with a downlink data transmission is scheduled to avoid a conflict with CRS in one or more first resource elements; means for determining a potential conflict between the CRS and a second DMRS associated with a SPS of the data transmission in the one or more first resource elements; and means for conveying the second DMRS in one or more second resource elements at least in part based on the potential conflict.

[0024] Aspects generally include methods, devices, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems substantially as described herein with reference to the figures and the description and as illustrated in the figures and the description.

[0025] The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the present disclosure in an effort that the detailed description hereinafter may be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples may be readily used as a basis for modifying or designing other structures for carrying out the same purposes as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, both as to their organization and method of operation, as well as associated advantages, will be better understood upon consideration of the following description in conjunction with the accompanying drawings. Each of the drawings is provided for the purpose of illustration and description, and not as a definition of the limits of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To enable a more particular understanding of the features described above in accordance with the present disclosure, reference may be had to the aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the drawings illustrate only certain typical aspects of the present disclosure and are not to be considered limiting of its scope, for the description may admit to other equally effective aspects. Like reference numerals in the different drawings may identify the same or similar elements.

[0027] Figure 1 is a diagram illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0028] Figure 2 is a diagram illustrating an example of a base station and a UE in communication in a wireless communication network in accordance with various aspects of the present disclosure.

[0029] Figure 3A is a diagram illustrating an example of a frame structure in a wireless communication network in accordance with various aspects of the present disclosure.

[0030] Figure 3B is a diagram illustrating an example of a synchronous communication hierarchy in a wireless communication network in accordance with various aspects of the present disclosure.

[0031] Figure 4 is a diagram illustrating an example of a time slot format with a normal cyclic prefix in accordance with various aspects of the present disclosure.

[0032] Figure 5 is a diagram illustrating an example of a logical architecture of a distributed radio access network (RAN) in accordance with various aspects of the present disclosure.

[0033] Figure 6 is a diagram illustrating an example of a physical architecture of a distributed RAN in accordance with various aspects of the present disclosure.

[0034] Figure 7 and 8 is a diagram illustrating an example of avoiding a conflict with a reference signal in accordance with various aspects of the present disclosure.

[0035] Figures 9 - 12 are diagrams illustrating example processes associated with avoiding conflicts with reference signals in accordance with various aspects of the present disclosure.

[0036] Figure 13 and 14 are diagrams illustrating example apparatuses for wireless communication in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0037] Aspects of the present disclosure are described more fully hereinafter with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, one of ordinary skill in the art should appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the present disclosure. For example, any number of the aspects set forth herein may be used to implement an apparatus or practice a method. In addition, the scope of the present disclosure is intended to cover such apparatus or methods practiced using other structures, functionality, or a combination of structures and functionality that supplement and / or are additional to the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein may be implemented by one or more elements of a claim.

[0038] Certain aspects of a telecommunications system will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in detail hereinafter and illustrated in the drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0039] It should be noted that while aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, aspects of the present disclosure may be applied in other generation-based communication systems (such as 5G and later generations, including NR technologies).

[0040] Figure 1FIG. 0 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS110a, BS110b, BS110c, and BS110d) and other network entities. A BS is an entity that communicates with user equipment (UE) and may also be referred to as a base station, NR BS, B node, gNB, 5G B node (NB), access point, transmission reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the coverage area of a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0041] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., with a radius of several kilometers) and may allow unrestricted access by UEs having a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs having a service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In the Figure 1 example shown in FIG. 5, BS110a may be a macro BS for macro cell 102a, BS110b may be a pico BS for pico cell 102b, and BS110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0042] In some aspects, a cell may not have to be stationary, and the geographic area of a cell may move according to the location of a mobile BS. In some aspects, BSs may be interconnected with each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or analogs using any suitable transport network.

[0043] The wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send the transmission of the data to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. In Figure 1 the example shown in

[0044] the relay base station 110d can communicate with the macro BS 110a and the UE 120d to facilitate communication between the BS 110a and the UE 120d. The relay base station may also be referred to as a relay BS, a relay station, a relay, etc.

[0045] The network controller 130 may be coupled to the set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. These BSs may also communicate with each other directly or indirectly, e.g., via a wireless or wired backhaul.

[0046] The UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, a ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0047] Some UEs may be considered machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to a network (e.g., a wide area network such as the Internet or a cellular network) or provide connectivity to the network via a wired or wireless communication link, for example. Some UEs may be considered Internet of Things (IoT) devices, and / or may be implemented as narrowband IoT (NB-IoT) devices. Some UEs may be considered customer premise equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, etc.

[0048] In general, any number of wireless networks may be deployed in a given geographical area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. The RAT may also be referred to as a radio technology, an air interface, etc. The frequency may also be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT in a given geographical area to avoid interference between wireless networks of different RATs. In some cases, an NR or 5G RAT network may be deployed.

[0049] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., communicate with each other without using base station 110 as an intermediary). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0050] As indicated above, Figure 1 is provided as an example. Other examples may be different from the example regarding Figure 1 described.

[0051] Figure 2 FIG. 200 shows a block diagram of the design of base station 110 and UE 120, where base station 110 and UE 120 may be Figure 1One of the base stations and one of the UEs in. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, where generally T≥1 and R≥1.

[0052] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCSs) for the UE at least in part based on the channel quality indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for the UE at least in part based on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRSs)) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple input multiple output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, overhead symbols, and / or reference symbols when applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from the modulators 232a to 232t may be transmitted via the T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be utilized to generate synchronization signals to convey additional information.

[0053] At the UE 120, antennas 252a through 252r may receive downlink signals from the base station 110 and / or other base stations and may provide the received signals to demodulators (DEMOD) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain the received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols when applicable, and provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide the decoded data for the UE 120 to the data sink 260, and provide the decoded control information and system information to the controller / processor 280. The channel processor may determine the reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of the UE 120 may be included in a housing.

[0054] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266 when applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, the uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 when applicable, and further processed by the receive processor 238 to obtain the decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and provide the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0055] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component may perform one or more techniques associated with avoiding collisions with reference signals, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component may perform or direct, for example, Figure 9 Process 900 of Figure 10 Process 1000 of Figure 11 Process 1100 of, and / or the operation of other processes as described herein. The memories 242 and 282 may store data and program code for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 and / or the memory 282 may include: a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when executed by one or more processors of the base station 110 and / or the UE 120, the one or more instructions may perform or direct, for example, Figure 9 Process 900 of Figure 10 Process 1000 of Figure 11 Process 1100 of, and / or the operation of other processes as described herein. The scheduler 246 may schedule the UE for data transmission on the downlink and / or uplink.

[0056] In some aspects, the base station 110 may include: means for determining one or more resource elements to be used for a cell-specific reference signal (CRS) pattern; means for determining a configuration of semi-persistent scheduling (SPS) for data transmission to the UE, the configuration rate-matching the data transmission around the one or more resource elements of the CRS pattern; means for transmitting the configuration to the UE; and so on. In some aspects, the base station 110 may include: means for determining that a first demodulation reference signal (DMRS) associated with downlink data transmission is scheduled to avoid a collision with the CRS in one or more first resource elements; means for determining a potential collision between the CRS and a second DMRS associated with SPS of the data transmission in the one or more first resource elements; means for transmitting the second DMRS in one or more second resource elements based at least in part on the potential collision; and so on. In some aspects, such means may include one or more components of the base station 110 described in conjunction with Figure 2 such as the antennas 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antennas 234, and so on.

[0057] In some aspects, UE 120 may include: means for receiving a configuration of an SPS for data transmission that rate matches the data transmission around one or more resource elements to be used for a CRS pattern; means for receiving SPS communications based at least in part on the configuration; and the like. In some aspects, UE 120 may include: means for receiving control information that schedules a first DMRS associated with a downlink data transmission to avoid collision with a CRS in one or more first resource elements; means for determining, based at least in part on the control information, a potential collision between the CRS in the one or more first resource elements and a second DMRS associated with the SPS for data transmission; means for determining, based at least in part on the potential collision, that the second DMRS is to be received in one or more second resource elements; means for receiving the second DMRS in the one or more second resource elements; and the like. In some aspects, such means may include a combination of Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0058] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0059] Figure 3A An example frame structure 300 for frequency division duplex (FDD) in a telecommunication system (e.g., NR) is shown. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames (sometimes referred to as frames). Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be divided into a set of Z (Z ≥ 1) subframes (e.g., with indices 0 to Z-1). Each subframe may have a predetermined duration (e.g., 1 ms) and may include a set of time slots (e.g., in Figure 3A Each subframe 2 is shown m time slots, where m is a parameter design for transmission, such as 0, 1, 2, 3, 4, etc.). Each time slot may include a set of L symbol periods. For example, each time slot may include fourteen symbol periods (e.g., Figure 3A ), seven symbol periods, or another number of symbol periods. In the case where a subframe includes two slots (e.g., when m=1), the subframe may include 2L symbol periods, where the 2L symbol periods in each subframe may be assigned indices 0 to 2L–1. In some aspects, the scheduling unit for FDD may be frame-based, subframe-based, slot-based, symbol-based, etc.

[0060] Although some techniques are described herein in connection with frames, sub - frames, time slots, etc., these techniques are equivalently applicable to other types of wireless communication structures, which may be referred to using terms other than "frame", "sub - frame", "time slot", etc. in 5G NR. In some aspects, a "wireless communication structure" may refer to a periodically time - bounded communication unit defined by a wireless communication standard and / or protocol. Additionally or alternatively, wireless communication structure configurations different from those shown in Figure 3A may be used.

[0061] In certain telecommunications (e.g., NR), a base station may transmit synchronization (SYNC) signals. For example, a base station may transmit a primary synchronization signal (PSS), a secondary synchronization signal (SSS), etc. on the downlink for each cell supported by the base station. The PSS and SSS may be used by a UE for cell search and capture. For example, the PSS may be used by the UE to determine symbol timing, and the SSS may be used by the UE to determine the physical cell identifier associated with the base station and frame timing. The base station may also transmit a physical broadcast channel (PBCH). The PBCH may carry some system information, such as system information to support the initial access of the UE.

[0062] In some aspects, a base station may transmit the PSS, SSS, and / or PBCH according to a synchronization communication hierarchy (e.g., a synchronization signal (SS) hierarchy) that includes multiple synchronization communications (e.g., SS blocks), as described below in connection with Figure 3B as described.

[0063] Figure 3B is a diagram illustrating an example SS hierarchy, which is an example of a synchronization communication hierarchy. As shown in Figure 3B the SS hierarchy may include an SS burst set, which may include multiple SS bursts (identified as SS burst 0 to SS burst B - 1, where B is the maximum number of SS bursts that can be transmitted by the base station). As further shown, each SS burst may include one or more SS blocks (identified as SS block 0 to SS block (b max_SS - 1), where b max_SS - 1 is the maximum number of SS blocks that can be carried by an SS burst). In some aspects, different SS blocks may be beamformed differently. The SS burst set may be transmitted periodically by a wireless node, such as every X milliseconds, as shown in Figure 3B The SS burst set may have a fixed or dynamic length, as shown as Y milliseconds in Figure 3B as shown in

[0064] Figure 3BThe SS burst set shown in [Figure 0] is an example of a synchronization communication set, and other synchronization communication sets can be used in combination with the techniques described herein. Additionally, Figure 3B The SS block shown in [Figure 1] is an example of synchronization communication, and other synchronization communications can be used in combination with the techniques described herein.

[0065] In some aspects, the SS block includes resources carrying the PSS, SSS, PBCH, and / or other synchronization signals (e.g., the third synchronization signal (TSS)) and / or synchronization channels. In some aspects, multiple SS blocks are included in an SS burst, and the PSS, SSS, and / or PBCH can be the same across each SS block of the SS burst. In some aspects, a single SS block can be included in an SS burst. In some aspects, the SS block can be at least four symbol periods in length, where each symbol carries one or more of the PSS (e.g., occupying one symbol), SSS (e.g., occupying one symbol), and / or PBCH (e.g., occupying two symbols).

[0066] In some aspects, the symbols of the SS block are contiguous, as Figure 3B shown in [Figure 2]. In some aspects, the symbols of the SS block are non - contiguous. Similarly, in some aspects, one or more SS blocks of an SS burst can be transmitted in contiguous radio resources (e.g., contiguous symbol periods) during one or more time slots. Additionally or alternatively, one or more SS blocks of an SS burst can be transmitted in non - contiguous radio resources.

[0067] In some aspects, the SS burst can have a burst period, whereby the SS blocks of the SS burst are transmitted by the base station according to this burst period. In other words, these SS blocks can be repeated during each SS burst. In some aspects, the SS burst set can have a burst set periodicity, whereby the SS bursts of the SS burst set are transmitted by the base station according to a fixed burst set periodicity. In other words, the SS bursts can be repeated during each SS burst set.

[0068] The base station can transmit system information, such as system information blocks (SIB), on the physical downlink shared channel (PDSCH) in certain time slots. The base station can transmit control information / data on the physical downlink control channel (PDCCH) in C symbol periods of a time slot, where B can be configured for each time slot. The base station can transmit traffic data and / or other data on the PDSCH in the remaining symbol periods of each time slot.

[0069] As indicated above, Figure 3A and 3B are provided as examples. Other examples can be different from those described with respect to Figure 3A and 3B .

[0070] Figure 4 Shows an example time slot format 410 with a normal cyclic prefix. The available time-frequency resources can be divided into resource blocks. Each resource block can cover a set of subcarriers (e.g., 12 subcarriers) in a time slot and can include several resource elements. Each resource element can cover a subcarrier in a symbol period (e.g., in time) and can be used to transmit a modulation symbol that can be a real-valued or complex-valued number.

[0071] For FDD in some telecommunication systems (e.g., NR), an interleaving structure can be used for each of the downlink and the uplink. For example, Q strands of interleaving with indices 0 to Q–1 can be defined, where Q can be equal to 4, 6, 8, 10, or some other value. Each strand of interleaving can include time slots spaced Q frames apart. Specifically, interleaving q can include time slots q, q+Q, q+2Q, etc., where q ∈ {0, …, Q–1}.

[0072] The UE may be within the coverage of multiple BSs. One of these BSs can be selected to serve the UE. The serving BS can be selected at least in part based on various criteria such as received signal strength, received signal quality, path loss, etc. The received signal quality can be quantified by the signal-to-noise and interference ratio (SNIR), or the reference signal received quality (RSRQ), or some other metric. The UE may operate in a strong interference scenario, in which the UE may observe high interference from one or more interfering BSs.

[0073] While aspects of the examples described herein may be associated with NR or 5G technologies, aspects of the present disclosure may be applicable to other wireless communication systems. New Radio (NR) may refer to a radio configured to operate according to a new air interface (e.g., different from an air interface based on Orthogonal Frequency Division Multiple Access (OFDMA)) or a fixed transport layer (e.g., different from Internet Protocol (IP)). In aspects, NR may utilize OFDM with a cyclic prefix (referred to herein as cyclic prefix OFDM or CP-OFDM) and / or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using Time Division Duplex (TDD). In aspects, NR may utilize, for example, OFDM with a cyclic prefix (referred to as CP-OFDM herein) and / or Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD. NR may include enhanced mobile broadband (eMBB) services targeted at wide bandwidths (e.g., 80 megahertz (MHz) and above), millimeter wave (mmW) targeted at high carrier frequencies (e.g., 60 gigahertz (GHz)), massive machine type communication (mMTC) targeted at non-backward compatible MTC technologies, and / or mission critical targeted at ultra-reliable low latency communication (URLLC) services.

[0074] In some aspects, a single component carrier bandwidth of 100 MHz may be supported. An NR resource block may span 12 subcarriers having a subcarrier bandwidth of 60 or 120 kilohertz (kHz) over a 0.1 ms duration. Each radio frame may include 40 time slots and may have a length of 10 ms. Thus, each time slot may have a length of 0.25 ms. Each time slot may indicate a link direction for data transmission (e.g., DL or UL) and the link direction for each time slot may be switched dynamically. Each time slot may include DL / UL data as well as DL / UL control data.

[0075] Beamforming may be supported and beam directions may be configured dynamically. MIMO transmission with precoding may also be supported. MIMO configurations in the DL may support up to 8 transmit antennas (multi-layer DL transmission with up to 8 streams) and up to 2 streams per UE. Multi-layer transmission with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported using up to 8 serving cells. Alternatively, NR may support different air interfaces other than OFDM-based interfaces. An NR network may include entities such as a central unit or a distributed unit.

[0076] As indicated above, Figure 4 is provided as an example. Other examples may be different from the examples described with respect to Figure 4 above.

[0077] Figure 5 An example logical architecture of the distributed RAN 500 in accordance with aspects of the present disclosure is illustrated. The 5G access node 506 may include an access node controller (ANC) 502. The ANC may be a central unit (CU) of the distributed RAN 500. The backhaul interface to the next generation core network (NG-CN) 504 may terminate at the ANC. The backhaul interface to an adjacent next generation access node (NG-AN) may terminate at the ANC. The ANC may include one or more transmit receive points (TRP) 508 (which may also be referred to as BS, NR BS, B node, 5G NB, AP, gNB, or some other term). As described above, "TRP" may be used interchangeably with "cell".

[0078] The TRP 508 may be a distributed unit (DU). The TRP may be connected to one ANC (ANC 502) or more than one ANC (not illustrated). For example, for RAN sharing, radio as a service (RaaS), and service-specific AND deployments, the TRP may be connected to more than one ANC. The TRP may include one or more antenna ports. The TRP may be configured to serve traffic to the UE individually (e.g., dynamically selected) or jointly (e.g., joint transmission).

[0079] The fronthaul communication may be illustrated using the local architecture of the RAN 500. The architecture may be defined to support fronthaul solutions across different deployment types. For example, the architecture may be at least partially based on transport network capabilities (e.g., bandwidth, latency, and / or jitter).

[0080] The architecture may share features and / or components with LTE. In accordance with aspects, the next generation AN (NG-AN) 510 may support dual connectivity with NR. For LTE and NR, the NG-AN may share a common fronthaul.

[0081] The architecture may enable cooperation between and among the various TRP 508. For example, cooperation may be preconfigured within the TRP and / or across the TRP via the ANC 502. In accordance with aspects, an interface between TRPs may not be required / absent.

[0082] In accordance with aspects, a dynamic configuration of split logical functions may exist within the architecture of the RAN 500. The packet data convergence protocol (PDCP), radio link control (RLC), or media access control (MAC) protocol may be adaptively placed at the ANC or the TRP.

[0083] In accordance with various aspects, the BS may include a central unit (CU) (e.g., ANC 502) and / or one or more distributed units (e.g., one or more TRP 508).

[0084] As indicated above, Figure 5 are provided as examples. Other examples may be different from those Figure 5 described.

[0085] Figure 6 FIG. 9 illustrates an example physical architecture of a distributed RAN 600 in accordance with aspects of the present disclosure. A centralized core network unit (C-CU) 602 may host core network functions. The C-CU may be centrally deployed. C-CU functionality may be offloaded (e.g., to an advanced wireless service (AWS)) to attempt to handle peak capacity.

[0086] A centralized RAN unit (C-RU) 604 may host one or more ANC functions. Optionally, the C-RU may locally host core network functions. The C-RU may have a distributed deployment. The C-RU may be closer to the network edge.

[0087] A distributed unit (DU) 606 may host one or more TRPs. The DU may be located at the edge of the network with radio frequency (RF) functionality.

[0088] As indicated above, Figure 6 are provided as examples. Other examples may be different from those Figure 6 described.

[0089] In some wireless communication systems, a UE may receive multiple downlink control information (DCI) communications from multiple TRPs, e.g., to schedule downlink transmissions from the multiple TRPs to the UE. In some cases, the UE may receive a configuration for semi-persistent scheduling (SPS) for data transmission. SPS is a mechanism for providing periodic resource allocations for downlink transmissions. For example, an SPS configuration may be associated with a fixed resource block allocation. SPS communications may be associated with a payload (e.g., a downlink shared channel) and a reference signal (such as a DMRS). In the case of downlink SPS communications, it may be difficult to avoid a conflict between the downlink SPS communication or the associated DMRS and another downlink signal, channel, or transmission (e.g., a CRS). In such cases, discarding the conflicting SPS communication or the associated DMRS may affect the performance of the downlink SPS communication or the associated DMRS.

[0090] Some of the techniques and apparatuses described herein implement avoiding potential conflicts between downlink SPS communications and reference signals (e.g., CRS). For example, in some aspects, a UE may receive a configuration for SPS for data transmission that rate matches the data transmission around a CRS pattern associated with one or more TRPs. Some of the techniques and apparatuses described herein implement avoiding potential conflicts between reference signals (e.g., DMRS) associated with SPS communications and another reference signal (e.g., CRS). For example, in some aspects, a UE may determine that resources for receiving DMRS associated with SPS communications are to be shifted at least in part based on the scheduling of DMRS associated with another data transmission. In this way, conflicts between downlink SPS communications or associated DMRS and another signal or communication are mitigated, thereby improving the performance of the downlink SPS communications or associated DMRS and the other signal or communication.

[0091] Figure 7 is a diagram illustrating example 700 of avoiding conflicts with reference signals in accordance with various aspects of the present disclosure. As Figure 7 shown, UE 120 may communicate with BS110. In some aspects, BS110 may be a TRP (e.g., TRP 508) or may include one or more TRPs.

[0092] As Figure 7 shown and indicated by reference numeral 705, BS110 may identify a CRS pattern (e.g., a CRS pattern according to the LTE specification). That is, BS110 may determine one or more resource elements to be used for the CRS pattern. In some aspects, BS110 may use the CRS pattern to transmit (e.g., broadcast) CRS. In some aspects, the CRS pattern may be used by one or more TRPs of BS110 to transmit (e.g., broadcast) CRS. For example, the CRS pattern may include a first CRS pattern associated with a first TRP of BS110 and a second CRS pattern associated with a second TRP of BS110. In some aspects, the first TRP and the second TRP may be associated with different BS110s. In other words, the CRS pattern may be an aggregation of corresponding CRS patterns used by multiple TRPs (e.g., the first TRP and the second TRP).

[0093] UE 120 may use the CRS for timing and frequency synchronization, for radio resource management (RRM) measurements, for time-domain and frequency-domain channel estimation, for coherent demodulation, for channel state information (CSI) measurements, and so on. In some aspects, each CRS pattern may be associated with a higher-layer signaling index value for each control resource set (CORESET) configured for UE 120. Accordingly, the CRS pattern associated with the index value may be used with the downlink transmissions scheduled by the DCI detected in the CORESET associated with the same index value.

[0094] As shown by reference numeral 710, BS110 may determine an SPS configuration for UE 120 (e.g., an SPS configuration according to the NR configuration). The SPS configuration may be associated with downlink data transmissions to UE 120 (e.g., periodic downlink data transmissions). In some aspects, BS110 may determine the SPS configuration at least in part based on the identified CRS pattern. For example, BS110 may determine the SPS configuration to avoid conflicts with the identified CRS pattern. In some aspects, BS110 may determine an SPS configuration that rate-matches the downlink data transmissions (e.g., periodic downlink data transmissions) around the CRS pattern (e.g., one or more resource elements used by the CRS pattern). In other words, the SPS configuration may schedule data transmissions in one or more resource elements that do not overlap with the one or more resource elements to be used for the CRS pattern.

[0095] In some aspects, BS110 (e.g., the first TRP) may determine an SPS configuration that rate-matches the downlink data transmissions around the first CRS pattern associated with the first TRP. In some aspects, BS110 (e.g., the second TRP) may determine an SPS configuration that rate-matches the downlink data transmissions around the second CRS pattern associated with the second TRP. In some aspects, BS110 (e.g., the first TRP or the second TRP) may determine an SPS configuration that rate-matches the downlink data transmissions around the first CRS pattern associated with the first TRP and the second CRS pattern associated with the second TRP.

[0096] As shown by reference numeral 715, BS110 may transmit and UE 120 may receive the SPS configuration. UE 120 may receive SPS communications according to the SPS configuration. In this way, the SPS communications received by UE 120 do not conflict with the CRS also received by the UE (e.g., due to rate-matching the SPS communications around the CRS), thereby improving the performance of the SPS communications and the CRS.

[0097] As indicated above, Figure 7 is provided as an example. Other examples may be different from those regardingFigure 7 The described example.

[0098] Figure 8 is a diagram illustrating Example 800 of avoiding conflicts with reference signals in accordance with various aspects of the present disclosure. As Figure 8 shown, UE 120 may communicate with a first TRP 805 and a second TRP 805 in combination with SPS and / or a downlink grant. In some aspects, the first TRP 805 and / or the second TRP 805 may correspond to TRP 508, BS110, etc. In some aspects, the first TRP 805 and the second TRP may be associated with a BS110 or respective corresponding BS110s.

[0099] As Figure 8 shown and indicated by reference numeral 810, the second TRP 805 may transmit and UE 120 may receive an SPS configuration for data transmission (e.g., periodic data transmission) for the second TRP 805, e.g., as described above in connection with Figure 7 the description. SPS communication according to the SPS configuration may be associated with a data payload and DMRS (e.g., DMRS according to the NR specification). In some aspects, UE 120 may be configured (e.g., via the SPS configuration) to receive the DMRS of the SPS communication in one or more first resource elements (e.g., in one or more symbols).

[0100] As indicated by reference numeral 815, the first TRP 805 may transmit and UE 120 may receive DCI scheduling the first DMRS for the downlink data transmission of the first TRP 805. Accordingly, the first DMRS and the associated downlink data transmission may be dynamically scheduled by the downlink grant in the DCI. In some aspects, the DCI may schedule the first DMRS to avoid conflicts with CRS in one or more first resource elements. For example, the DCI may schedule the first DMRS in one or more second resource elements (e.g., shift the first DMRS) to avoid conflicts with CRS in one or more first resource elements. In some aspects, the first TRP 805, the BS110 associated with the first TRP 805 (e.g., the central unit of BS110), etc. may determine the scheduling of the first DMRS to avoid conflicts.

[0101] As shown by reference numeral 820, the UE 120 may determine a potential conflict between the CRS (e.g., CRS pattern) and a second DMRS associated with SPS communication and scheduled in one or more first resource elements, at least in part based on the DCI. For example, the UE 120 may determine (e.g., infer) that the DCI does not schedule a first DMRS in one or more first resource elements (e.g., the first DMRS has been shifted), because one or more CRSs are scheduled in one or more first resource elements. Accordingly, the UE 120 may determine that there is a potential conflict between one or more CRSs scheduled (e.g., inferred to be scheduled) in one or more first resource elements and a second DMRS that is also scheduled (e.g., via SPS configuration) in the one or more first resource elements.

[0102] As shown by reference numeral 825, the UE 120 may determine to shift the reception of the second DMRS associated with SPS communication based on the determined potential conflict. For example, the UE 120 may determine, based on the determined potential conflict, that the UE 120 is to receive the second DMRS in one or more second resource elements (e.g., symbols) or one or more third resource elements (e.g., symbols). In some aspects, the UE 120 may determine that the second DMRS is to be shifted in time to the location where the DCI schedules the first DMRS (e.g., one or more second resource elements). In this case, the first DMRS may be associated with a code division multiplexing (CDM) group different from the second DMRS. In certain aspects, the UE 120 may determine that the second DMRS is to be shifted in time to another location (e.g., one or more third resource elements where the DCI does not schedule the first DMRS) based on an offset from the location where the first DMRS is scheduled.

[0103] As shown by reference numeral 830, the second TRP 805 may transmit and the UE 120 may receive a second DMRS that is shifted relative to an initial configuration (e.g., SPS configuration) for the UE 120 to receive the DMRS. For example, the second TRP 805 may transmit and the UE 120 may receive the second DMRS in one or more second resource elements.

[0104] In some aspects, the second TRP 805, the BS 110 associated with the second TRP 805 (e.g., the central unit of the BS 110), etc. may determine to shift the transmission of the second DMRS in a manner similar to that described above. For example, the second TRP, the BS 110, etc. may determine to shift the transmission of the second DMRS at least in part based on determining that the first DMRS is scheduled (e.g., scheduled by the DCI) to avoid a conflict with one or more CRSs in one or more first resource elements (e.g., the first DMRS is shifted).

[0105] Accordingly, the second TRP, BS110, etc. may determine a potential conflict between one or more CRSs scheduled in one or more first resource elements and a second DMRS (e.g., via SPS configuration) also scheduled in one or more first resource elements. Based on the determined potential conflict, the second TRP, BS110, etc. may determine that the second DMRS is to be transmitted in one or more second resource elements or one or more third resource elements, as described above.

[0106] In some aspects, both the SPS configuration and the DCI may be associated with one of the first TRP 805 or the second TRP 805, and the second DMRS may be shifted in a manner similar to that described above.

[0107] As indicated above, Figure 8 is provided as an example. Other examples may be different from the example Figure 8 described.

[0108] Figure 9 is a diagram illustrating an example process 900, performed, for example, by a BS, in accordance with various aspects of the present disclosure. The example process 900 is an example of operations performed by a BS (e.g., BS110, etc.) associated with avoiding conflicts with reference signals.

[0109] As Figure 9 shown, in some aspects, process 900 may include determining one or more resource elements to be used for a CRS pattern (block 910). For example, the BS (e.g., using the controller / processor 240, etc.) may determine one or more resource elements to be used for a CRS pattern, as described above.

[0110] As Figure 9 further shown, in some aspects, process 900 may include determining a configuration of SPS for data transmission to a UE that rate matches the data transmission around one or more resource elements of the CRS pattern (block 920). For example, the BS (e.g., using the controller / processor 240, etc.) may determine a configuration of SPS for data transmission to a UE that rate matches the data transmission around one or more resource elements of the CRS pattern, as described above.

[0111] As Figure 9 further shown, in some aspects, process 900 may include transmitting the configuration to the UE (block 930). For example, the BS (e.g., using the controller / processor 240, the transmit processor 220, the TX MIMO processor 230, the MOD 232, the antenna 234, etc.) may transmit the configuration to the UE, as described above.

[0112] Process 900 may include additional aspects, such as any individual aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0113] In a first aspect, a CRS pattern is associated with a TRP. In a second aspect, separately or in combination with the first aspect, the CRS pattern includes a first CRS pattern of a first TRP and a second CRS pattern of a second TRP.

[0114] Although Figure 9 example blocks of process 900 are shown, in some aspects, process 900 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently than those depicted in Figure 9 . Additionally or alternatively, two or more blocks of process 900 may be executed in parallel.

[0115] Figure 10 is a diagram illustrating an example process 1000, such as performed by a UE, in accordance with various aspects of the present disclosure. Example process 1000 is an example of operations performed by a UE (e.g., UE 120, etc.) associated with avoiding conflicts with reference signals.

[0116] As Figure 10 shown, in some aspects, process 1000 may include receiving control information that schedules a first DMRS associated with a downlink data transmission to avoid a conflict with CRS in one or more first resource elements (block 1010). For example, a UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may receive control information that schedules a first DMRS associated with a downlink data transmission to avoid a conflict with CRS in one or more first resource elements, as described above.

[0117] As Figure 10 further shown, in some aspects, process 1000 may include determining a potential conflict between CRS in one or more first resource elements and a second DMRS associated with SPS of data transmission, at least in part based on the control information (block 1020). For example, a UE (e.g., using controller / processor 280, etc.) may determine a potential conflict between CRS in one or more first resource elements and a second DMRS associated with SPS of data transmission, at least in part based on the control information, as described above.

[0118] As Figure 10As further shown in, in some aspects, process 1000 may include determining that a second DMRS is to be received in one or more second resource elements, at least in part based on the potential conflict (block 1030). For example, a UE (e.g., using controller / processor 280, etc.) may determine that a second DMRS is to be received in one or more second resource elements, at least in part based on the potential conflict, as described above.

[0119] As Figure 10 As further shown in, in some aspects, process 1000 may include receiving a second DMRS in one or more second resource elements (block 1040). For example, a UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may receive a second DMRS in one or more second resource elements, as described above.

[0120] Process 1000 may include additional aspects, such as any individual aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0121] In a first aspect, the control information schedules a first DMRS in one or more second resource elements. In a second aspect, separately or in combination with the first aspect, a downlink data transmission is associated with a first TRP, and the SPS of the data transmission is associated with a second TRP. In a third aspect, separately or in combination with one or more of the first and second aspects, one or more second resource elements are offset from one or more third resource elements in which the control information schedules the first DMRS.

[0122] Although Figure 10 example blocks of process 1000 are shown, in some aspects, process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks compared to the blocks depicted in Figure 10 In addition or alternatively, two or more blocks of process 1000 may be executed in parallel.

[0123] Figure 11 is a diagram illustrating an example process 1100, such as performed by a BS, in accordance with various aspects of the present disclosure. Example process 1100 is an example of operations performed by a BS (e.g., BS110, etc.) associated with avoiding conflicts with reference signals.

[0124] As in Figure 11As shown, in some aspects, process 1100 may include determining that a first DMRS associated with a downlink data transmission is scheduled to avoid a conflict with CRS in one or more first resource elements (block 1110). For example, a BS (e.g., using controller / processor 240, etc.) may determine that a first DMRS associated with a downlink data transmission is scheduled to avoid a conflict with CRS in one or more first resource elements, as described above.

[0125] As Figure 11 Further shown, in some aspects, process 1100 may include determining a potential conflict between CRS in one or more first resource elements and a second DMRS associated with SPS of a data transmission (block 1120). For example, a BS (e.g., using controller / processor 240, etc.) may determine a potential conflict between CRS in one or more first resource elements and a second DMRS associated with SPS of a data transmission, as described above.

[0126] As Figure 11 Further shown, in some aspects, process 1100 may include transmitting the second DMRS in one or more second resource elements at least partially based on the potential conflict (block 1130). For example, a BS (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may transmit the second DMRS in one or more second resource elements at least partially based on the potential conflict, as described above.

[0127] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0128] In a first aspect, the first DMRS is scheduled in one or more second resource elements. In a second aspect, separately or in combination with the first aspect, the downlink data transmission is associated with a first TRP, and the SPS of the data transmission is associated with a second TRP. In a third aspect, separately or in combination with one or more of the first and second aspects, one or more second resource elements are offset from one or more third resource elements in which the first DMRS is scheduled.

[0129] Although Figure 11 example blocks of process 1100 are shown, in some aspects, process 1100 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks compared to the blocks depicted in Figure 11 . Additionally or alternatively, two or more blocks of process 1100 may be executed in parallel.

[0130] Figure 12 FIG. is an illustration depicting an example process 1200, such as may be performed by a UE, in accordance with various aspects of the present disclosure. Example process 1200 is an example of operations performed by a UE (e.g., UE 120) associated with avoiding collisions with reference signals.

[0131] As shown in Figure 12 , in some aspects, process 1200 may include receiving a configuration for SPS for data transmission that rate matches the data transmission around one or more resource elements to be used for a CRS pattern (block 1210). For example, a UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282) may receive a configuration for SPS for data transmission that rate matches the data transmission around one or more resource elements to be used for a CRS pattern, as described above.

[0132] As Figure 12 further shown in, in some aspects, process 1200 may include receiving SPS communications based at least in part on the configuration (block 1220). For example, a UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282) may receive SPS communications based at least in part on the configuration, as described above.

[0133] Process 1200 may include additional aspects, such as any individual aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0134] In a first aspect, the CRS pattern is associated with a TRP. In a second aspect, alone or in combination with the first aspect, the CRS pattern includes a first CRS pattern of a first TRP and a second CRS pattern of a second TRP.

[0135] Although Figure 12 example blocks of process 1200 are shown, in some aspects, process 1200 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Figure 12 . Additionally or alternatively, two or more blocks of process 1200 may be performed in parallel.

[0136] Figure 13FIG. is a diagram of an example apparatus 1300 for wireless communication in accordance with various aspects of the present disclosure. Apparatus 1300 may be a UE, or a UE may include apparatus 1300. In some aspects, apparatus 1300 includes a receiving component 1302 and a transmitting component 1304, which may be in communication with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1300 may use receiving component 1302 and transmitting component 1304 to communicate with another apparatus 1306 (such as a UE, a base station, or another wireless communication device). As further shown, apparatus 1300 may include a determining component 1308 and other examples.

[0137] In some aspects, apparatus 1300 may be configured to perform one or more operations described herein in connection with Figures 7 - 8 Additionally or alternatively, apparatus 1300 may be configured to perform one or more processes described herein (such as Figure 10 process 1000 of Figure 12 process 1200 of Figure 13 or a combination thereof). In some aspects, apparatus 1300 and / or Figure 2 one or more components shown therein may include one or more components of the UE described above in connection with Figure 13 Additionally or alternatively, Figure 2 one or more components shown therein may be implemented within one or more components described above in connection with

[0138] Additionally or alternatively, one or more components in the component set may be implemented at least in part as software stored in a memory. For example, a component (or a part of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and may be executed by a controller or a processor to perform the functions or operations of the component. Figure 2 one or more antennas, demodulators, MIMO detectors, receiving processors, controllers / processors, memories, or combinations thereof of the UE described above in connection with

[0139] The transmission component 1304 may transmit communications (such as reference signals, control information, data communications, or combinations thereof) to the device 1306. In some aspects, one or more other components of the device 1306 may generate communications and may provide the generated communications to the transmission component 1304 for transmission to the device 1306. In some aspects, the transmission component 1304 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, coding, and other examples) on the generated communications and may transmit the processed signals to the device 1306. In some aspects, the transmission component 1304 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or combinations thereof of the UE described above in connection with Figure 2 . In some aspects, the transmission component 1304 may be co-located in a transceiver with the receiving component 1302.

[0140] The receiving component 1302 may receive a configuration of SPS for data transmission that rate-matches the data transmission around one or more resource elements to be used for the CRS mode. The receiving component 1302 may receive SPS communications at least partially based on the configuration.

[0141] The receiving component 1302 may receive control information that schedules a first DMRS associated with downlink data transmission to avoid a conflict with CRS in one or more first resource elements. The determining component 1308 may determine a potential conflict between CRS in the one or more first resource elements and a second DMRS associated with SPS of data transmission at least partially based on the control information. In some aspects, the determining component 1308 may include a controller / processor, a memory, or combinations thereof of the UE described above in connection with Figure 2 . The determining component 1308 may determine that the second DMRS is to be received in one or more second resource elements at least partially based on the potential conflict. The receiving component 1302 may receive the second DMRS in the one or more second resource elements.

[0142] Figure 13 The number and arrangement of the components shown in Figure 13 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components compared to those shown in Figure 13 . Additionally, two or more of the components shown in Figure 13 may be implemented in a single component, or Figure 13 a single component shown in Figure 13 may be implemented as multiple distributed components. Additionally or alternatively, Figure 13 a set of components (e.g., one or more components) shown in Figure 13 may perform one or more functions described as being performed by another set of components shown in Figure 13 .

[0143] Figure 14 is a diagram of an example apparatus 1400 for wireless communication in accordance with various aspects of the present disclosure. The apparatus 1400 can be a BS, or the BS can include the apparatus 1400. In some aspects, the apparatus 1400 includes a receiving component 1402 and a transmitting component 1404, which can be in communication with each other (e.g., via one or more buses and / or one or more other components). As shown, the apparatus 1400 can use the receiving component 1402 and the transmitting component 1404 to communicate with another apparatus 1406 (such as a UE, a base station, or another wireless communication device). As further shown, the apparatus 1400 can include a determining component 1408 and other examples.

[0144] In some aspects, the apparatus 1400 can be configured to perform one or more operations described herein in connection with Figures 7 - 8 Additionally or alternatively, the apparatus 1400 can be configured to perform one or more processes described herein (such as Figure 9 process 900 of Figure 11 process 1100 of Figure 14 or a combination thereof). In some aspects, the apparatus 1400 and / or Figure 2 one or more components shown in Figure 14 can include one or more components of the BS described above in connection with Figure 2 Additionally or alternatively,

[0145] one or more components shown in Figure 2 can be implemented within one or more components described above in connection with

[0146] can be implemented within one or more components described above in connection with Figure 2 Additionally or alternatively, one or more components of the component set can be implemented at least in part as software stored in a memory. For example, a component (or a part of a component) can be implemented as instructions or code stored in a non-transitory computer-readable medium and can be executed by a controller or a processor to perform the functions or operations of the component.

[0145] The receiving component 1402 can receive communications (such as reference signals, control information, data communications, or a combination thereof) from the apparatus 1406. The receiving component 1402 can provide the received communications to one or more other components of the apparatus 1400. In some aspects, the receiving component 1402 can perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, and other examples) on the received communications and can provide the processed signals to one or more other components of the apparatus 1406. In some aspects, the receiving component 1402 can include one or more antennas, demodulators, MIMO detectors, receiving processors, controllers / processors, memories, or a combination thereof of the BS described above in connection with Figure 2

[0146] The transmission component 1404 may transmit communications (such as reference signals, control information, data communications, or combinations thereof) to the device 1406. In some aspects, one or more other components of the device 1406 may generate communications and may provide the generated communications to the transmission component 1404 for transmission to the device 1406. In some aspects, the transmission component 1404 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, encoding, and other examples) on the generated communications and may transmit the processed signals to the device 1406. In some aspects, the transmission component 1404 may include one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the BS described above in conjunction with Figure 2 . In some aspects, the transmission component 1404 may be co-located in a transceiver with the receiving component 1402.

[0147] The determination component 1408 may determine one or more resource elements to be used for the CRS mode. In some aspects, the determination component 1408 may include a controller / processor, a memory, or combinations thereof of the BS described above in conjunction with Figure 2 . The determination component 1408 may determine the configuration of the SPS for data transmission to the UE, which rate-matches the data transmission around one or more resource elements of the CRS mode. The transmission component 1404 may transmit the configuration to the UE.

[0148] The determination component 1408 may determine that the first DMRS associated with the downlink data transmission is scheduled to avoid a conflict with the CRS in one or more first resource elements. The determination component 1408 may determine a potential conflict between the CRS in one or more first resource elements and the second DMRS associated with the SPS of the data transmission. The transmission component 1404 may transmit the second DMRS in one or more second resource elements at least partially based on the potential conflict.

[0149] Figure 14 The number and arrangement of the components shown in Figure 14 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components compared to those shown in Figure 14 . Additionally, two or more components shown in Figure 14 may be implemented in a single component, or a single component shown in Figure 14 may be implemented as multiple distributed components. Additionally or alternatively, a set of components (e.g., one or more components) shown in Figure 14 may perform one or more functions described as being performed by another set of components shown in

[0150] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired through the practice of the aspects.

[0151] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0152] As used herein, depending on the context, meeting a threshold may refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0153] It will be apparent that the systems and / or methods described herein may be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual specific control hardware or software code used to implement these systems and / or methods does not limit the aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software code—understanding that software and hardware can be designed to implement these systems and / or methods at least in part based on the description herein.

[0154] Although specific feature combinations are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the respective aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and / or not disclosed in the specification. Although each of the dependent claims listed below may directly depend on only one claim, the disclosure of the respective aspects includes each dependent claim in combination with each other claim in this set of claims. The phrase reciting "at least one of" a list of items refers to any combination of these items, including a single member. As an example, "at least one of a, b, or c" is intended to cover: a, b, c, a - b, a - c, b - c, and a - b - c, as well as any combination with multiple identical elements (e.g., a - a, a - a - a, a - a - b, a - a - c, a - b - b, a - c - c, b - b, b - b - b, b - b - c, c - c, and c - c - c, or any other ordering of a, b, and c).

[0155] Elements, acts, or instructions used herein should not be construed as critical or essential, unless expressly described as such. Also, as used herein, the articles "a" and "an" are intended to include one or more items and may be used interchangeably with "one or more." Further, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more." Where only one item is intended, the phrase "only one" or similar language is used. Also, as used herein, the terms "having," "containing," "including," etc. are intended to be open-ended terms. Further, the phrase "based on" is intended to mean "at least partially based on," unless otherwise expressly stated.

Claims

1. A wireless communication method performed by a user equipment UE, comprising: receiving control information that schedules a first demodulation reference signal DMRS associated with downlink data transmission to avoid conflict with cell-specific reference signals CRS in one or more first resource elements; determining, at least in part based on the control information, a potential conflict between the CRS and a second DMRS associated with semi-persistent scheduling SPS of data transmission in the one or more first resource elements; determining, at least in part based on the potential conflict, that the second DMRS is to be shifted to a position associated with one or more second resource elements, wherein the downlink data transmission is associated with a first CRS pattern of a first cell, and the SPS of the data transmission is associated with a second CRS pattern of a second cell; and receiving the second DMRS in the one or more second resource elements.

2. The method according to claim 1, wherein the control information schedules the first DMRS in the one or more second resource elements.

3. The method according to claim 1, wherein the one or more second resource elements are offset from one or more third resource elements in which the control information schedules the first DMRS.

4. The method according to claim 1, wherein the downlink data transmission is associated with a first transmission reception point TRP, and the SPS of the data transmission is associated with a second TRP.

5. The method according to claim 1, wherein the downlink data transmission is associated with a first base station associated with the first cell, and the SPS of the data transmission is associated with a second base station associated with the second cell.

6. The method according to claim 1, wherein the second DMRS is shifted in time to the position of the one or more second resource elements, and wherein the first DMRS and the second DMRS are associated with different code division multiplexing CDM groups.

7. The method according to claim 1, further comprising: determining that the second DMRS is to be shifted in time to the position associated with the one or more second resource elements based on an offset from the position of one or more third resource elements in which the first DMRS is to be received.

8. The method according to claim 1, wherein the first CRS pattern and the second CRS pattern are associated with respective higher layer signaling index values of each control resource set configured for the UE.

9. A method for a base station to perform wireless communication, comprising: determining that a first demodulation reference signal DMRS associated with downlink data transmission is scheduled to avoid conflict with cell-specific reference signals CRS in one or more first resource elements; Determine a potential conflict between the CRS in the one or more first resource elements and a second DMRS associated with semi-persistent scheduling (SPS) of data transmission, wherein the second DMRS is to be shifted to the position of one or more second resource elements, and wherein the downlink data transmission is associated with a first CRS pattern of a first cell, and the SPS of the data transmission is associated with a second CRS pattern of a second cell; and Transmit the second DMRS in the one or more second resource elements at least partially based on the potential conflict.

10. The method according to claim 9, wherein the first DMRS is scheduled in the one or more second resource elements.

11. The method according to claim 9, wherein the one or more second resource elements are offset from one or more third resource elements in which the first DMRS is scheduled.

12. The method according to claim 9, wherein the downlink data transmission is associated with a first transmission reception point (TRP), and the SPS of the data transmission is associated with a second TRP.

13. The method according to claim 9, wherein the downlink data transmission is associated with a first base station associated with the first cell, and the SPS of the data transmission is associated with a second base station associated with the second cell.

14. The method according to claim 9, wherein the second DMRS is shifted in time to the position of the one or more second resource elements, and wherein the first DMRS and the second DMRS are associated with different code division multiplexing (CDM) groups.

15. The method according to claim 9, wherein the first CRS pattern and the second CRS pattern are associated with respective higher layer signaling index values for each control resource set configured for a user equipment (UE).

16. A user equipment (UE) for wireless communication, comprising: One or more memories; and One or more processors coupled to the one or more memories, the one or more processors individually or jointly configured to cause the UE to: Receive control information that schedules a first demodulation reference signal (DMRS) associated with a downlink data transmission to avoid a conflict with cell-specific reference signals (CRS) in one or more first resource elements; Determine a potential conflict between the CRS in the one or more first resource elements and a second DMRS associated with semi-persistent scheduling (SPS) of data transmission at least partially based on the control information; Determine that the second DMRS is to be shifted to a position associated with one or more second resource elements at least partially based on the potential conflict, wherein the downlink data transmission is associated with a first CRS pattern of a first cell, and the SPS of the data transmission is associated with a second CRS pattern of a second cell; and Receive the second DMRS in the one or more second resource elements.

17. The UE according to claim 16, wherein the control information schedules the first DMRS in the one or more second resource elements.

18. The UE according to claim 16, wherein the one or more second resource elements are offset from one or more third resource elements in which the control information schedules the first DMRS.

19. The UE according to claim 16, wherein the downlink data transmission is associated with a first transmission reception point (TRP), and the semi-persistent scheduling (SPS) of the data transmission is associated with a second TRP.

20. The UE according to claim 16, wherein the downlink data transmission is associated with a first base station associated with the first cell, and the SPS of the data transmission is associated with a second base station associated with the second cell.

21. The UE according to claim 16, wherein the first common reference signal (CRS) pattern and the second CRS pattern are associated with respective higher layer signaling index values for each control resource set configured for the UE.

22. The UE according to claim 16, wherein the second DMRS is time-shifted to the position of the one or more second resource elements, and wherein the first DMRS and the second DMRS are associated with different code division multiplexing (CDM) groups.

23. The UE according to claim 16, wherein the one or more processors are further configured to cause the UE to: determine that the second DMRS is to be time-shifted to the position associated with the one or more second resource elements based on an offset from the position of one or more third resource elements in which the first DMRS is to be received.

24. A base station for wireless communication, comprising: one or more memories; and one or more processors coupled to the one or more memories, the one or more processors individually or jointly configured to cause the base station to: determine that a first demodulation reference signal (DMRS) associated with a downlink data transmission is scheduled to avoid a conflict with cell-specific reference signals (CRS) in one or more first resource elements; determine a potential conflict between the CRS in the one or more first resource elements and a second DMRS associated with semi-persistent scheduling (SPS) of the data transmission, wherein the second DMRS is to be shifted to a position associated with one or more second resource elements, and wherein the downlink data transmission is associated with a first CRS pattern of a first cell, and the SPS of the data transmission is associated with a second CRS pattern of a second cell; and transmit the second DMRS in the one or more second resource elements at least in part based on the potential conflict.

25. The base station according to claim 24, wherein the first DMRS is scheduled in the one or more second resource elements.

26. The base station according to claim 24, wherein the one or more second resource elements are offset from one or more third resource elements in which the first DMRS is scheduled.

27. The base station according to claim 24, wherein the downlink data transmission is associated with a first transmission reception point (TRP), and the SPS of the data transmission is associated with a second TRP.

28. The base station according to claim 24, wherein the downlink data transmission is associated with a first base station associated with the first cell, and the SPS of the data transmission is associated with a second base station associated with the second cell.

29. The base station according to claim 24, wherein the second DMRS is time-shifted to the position of the one or more second resource elements, and wherein the first DMRS and the second DMRS are associated with different code division multiplexing (CDM) groups.

30. The base station according to claim 24, wherein the first CRS pattern and the second CRS pattern are associated with respective higher layer signaling index values for each control resource set configured for a user equipment (UE).

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