Space preemption indication for downlink, uplink and sidelink transmissions

Abstract

Some aspects provide a method for wireless communication by a user equipment (UE). The method generally includes receiving signaling of a spatial preemption indication (PI), identifying at least one beam that the UE is preempted from using to transmit or receive at least one of at least one target signal based on the spatial PI, and refraining from using the identified beam to transmit or receive the target signal for at least a period of time.

Description

[0001] Priority claim

[0002] This application claims priority to U.S. Application No. 17 / 025,595, filed on September 18, 2020, which claims the benefit of and priority to Greek Provisional Application No. 20190100409, filed on September 24, 2019, the entire contents of both applications are expressly incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0003] Aspects of the present disclosure relate to wireless communications and, more particularly, to techniques for indicating when one or more spatial directions should be avoided (by a user device) when transmitting or receiving a target signal. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcast, etc. These wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, 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 (SCFDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, to name a few.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard released by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using OFDMA with cyclic prefix (CP) on downlink (DL) and uplink (UL). To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0006] However, as the demand for mobile broadband access continues to grow, further improvements to NR and LTE technologies are needed. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that adopt these technologies.

[0007] A Media Access Control (MAC)-Control Element (MAC-CE) is a MAC layer communication structure that can be used for the exchange of control commands between wireless nodes. For example, a base station can send a MAC CE to a user equipment (UE) to put the UE into a discontinuous reception (DRX) mode, thereby reducing the power consumption of the UE. The MAC-CE can be carried in a shared channel such as a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical sidelink shared channel. The MAC-CE can also be used to transmit information that facilitates communication, such as information about buffer status and available power headroom. Summary of the invention

[0008] The systems, methods and devices of the disclosure each have several innovative aspects, no single one of which is solely responsible for its desirable attributes.

[0009] Certain aspects of the subject matter described in the present disclosure may be implemented in a method for wireless communication by a user equipment (UE). The method generally includes receiving signaling of a spatial preemption indication (PI), identifying at least one beam that the UE is preempted from using to transmit or receive at least one of at least one target signal based on the spatial PI, and refraining from using the identified beam to transmit or receive the target signal for at least a period of time.

[0010] Certain aspects of the present disclosure are directed to an apparatus for wireless communication by a UE. The apparatus generally includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to receive signaling of a spatial PI, identify at least one beam that the UE is preempted from using to transmit or receive at least one of at least one target signal based on the spatial PI, and refrain from using the identified beam to transmit or receive the target signal for at least a period of time.

[0011] Certain aspects of the present disclosure are directed to an apparatus for wireless communication by a UE. The apparatus generally includes means for receiving signaling of a spatial PI, means for identifying at least one beam that the UE is preempted from using to transmit or receive at least one of at least one target signal based on the spatial PI, and means for refraining from using the identified beam to transmit or receive the target signal for at least a period of time.

[0012] Certain aspects of the present disclosure are directed to a computer-readable medium having instructions stored thereon for receiving signaling of a spatial PI, identifying at least one beam on which a UE is preempted and cannot be used to send or receive at least one of at least one target signal based on the spatial PI, and suppressing use of the identified beam to send or receive the target signal for at least a period of time.

[0013] Certain aspects of the subject matter described in this disclosure may be implemented in a method for wireless communication by an apparatus. The method generally includes identifying at least one beam corresponding to a direction that at least one UE is to avoid for transmitting or receiving at least one of target signals, and sending signaling to the UE indicating a spatial PI of the at least one beam.

[0014] Certain aspects of the present disclosure are directed to an apparatus for wireless communications by an apparatus. The apparatus generally includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to identify at least one beam corresponding to a direction that at least one UE is to avoid for transmitting or receiving at least one of target signals, and to send signaling to the UE indicating a spatial PI of the at least one beam.

[0015] Certain aspects of the present disclosure are directed to an apparatus for wireless communications by the apparatus. The apparatus generally includes means for identifying at least one beam corresponding to a direction that at least one UE is to avoid for transmitting or receiving at least one of target signals, and means for signaling to the UE a spatial PI of the at least one beam.

[0016] Certain aspects of the present disclosure are directed to a computer-readable medium having stored thereon instructions for identifying at least one beam corresponding to a direction that at least one UE should avoid for transmitting or receiving at least one of target signals, and for sending signaling to the UE indicating a spatial PI of the at least one beam.

[0017] To achieve the aforementioned and related purposes, one or more aspects include features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail some illustrative features of one or more aspects. However, these features are only indicative of a few of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The details of one or more embodiments of the subject matter described in the present disclosure are set forth in the accompanying drawings and the following description. However, the accompanying drawings only illustrate some typical aspects of the present disclosure and therefore should not be considered as limiting its scope. Other features, aspects and advantages will become apparent from the description, drawings and claims.

[0019] Figure 1 An example wireless communication network is shown in which some aspects of the present disclosure may be performed.

[0020] Figure 2 Shown is a block diagram illustrating an example base station (BS) and an example user equipment (UE) according to some aspects of the present disclosure.

[0021] Figure 3An example of a frame format for a New Radio (NR) system in accordance with certain aspects of the present disclosure is shown.

[0022] Figure 4A and Figure 4B A diagram of an example vehicle-to-everything (V2X) system is shown in accordance with some aspects of the present disclosure.

[0023] Figure 5A-5C An example is shown of multiplexing different types of traffic that may lead to preemption.

[0024] Figure 6 An example format of a preemption indication is shown.

[0025] Figure 7 An example sidelink communication mode is shown.

[0026] Fig. 8A and Figure 8B An example of the spatial relationship between the source signal and the target signal is shown.

[0027] Fig.9A and Fig. 9B An example of the spatial relationship between the source signal and the target signal is shown.

[0028] Fig. 10A and Fig. 10B An example of the spatial relationship between source and target signals in a multi-TRP / multi-panel scenario is shown.

[0029] Fig.11 Example operations for wireless communications by a user device are shown in accordance with some aspects of the present disclosure.

[0030] Fig.12 Example operations for wireless communications by an apparatus are shown in accordance with some aspects of the present disclosure.

[0031] Figure 13A-13C An example of spatial preemption for sidelink communications according to some aspects of the present disclosure is shown.

[0032] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0033] Various aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for signaling and processing indications of spatial preemption. As will be described in more detail below, spatial preemption may indicate to a user equipment (UE) to avoid at least one beam used to transmit or receive a target signal (e.g., avoid transmitting a signal that may cause interference, or avoid receiving using a beam that may be interfered with).

[0034] Without departing from the scope of the present disclosure, the function and arrangement of the elements discussed can be changed. Various examples can appropriately omit, replace or add various processes or components. For example, the described method can be performed in an order different from that described, and various steps can be added, omitted or combined. In addition, the features described in some examples can be combined in some other examples. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such a device or method, which is practiced using other structures, functions, or structures and functions of the various aspects of the present disclosure set forth herein or in addition to these aspects. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of the claims.

[0035] Typically, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, subcarrier, channel, tone, subband, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, 5G NR RAT networks may be deployed.

[0036] Figure 1 An example wireless communication network 100 is shown in which various aspects of the present disclosure may be implemented. Figure 1 As shown, UE 120a, UE 120b and / or BS 110a may include a space preemption module (respectively 122a, 122b and / or 112b), which may be configured to perform Fig.11 Operation 1100 and / or Fig.12 Operation 1200 of the present invention may be used to send and / or process a spatial preemption indication as described herein.

[0037] NR access (e.g., 5G NR) can support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or above), millimeter wave (mmWave) targeting high carrier frequency (e.g., 25 GHz or above), massive machine type communication MTC (mMTC) targeting non-backward compatible MTC technology, or mission-critical services targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services can coexist in the same time domain resources (e.g., time slots or subframes) or frequency domain resources (e.g., component carriers).

[0038] like Figure 1 As shown, the wireless communication network 100 may include multiple base stations (BSs) 110a-z (each also individually referred to as BS 110 or collectively referred to as multiple BSs 110 in this document) and other network entities. BS 110 can provide communication coverage for a specific geographic area (sometimes referred to as a "cell"), which can be fixed or can move according to the location of the mobile BS 110. In some examples, BS 110 can be interconnected with each other or with one or more other BSs or network nodes (not shown) in the wireless communication network 100 through various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.) using any suitable transmission network. Figure 1 In the example shown, BSs 110a, 110b, and 110c may be macro BSs of macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS of a pico cell 102x. BSs 110y and 110z may be femto BSs of femto cells 102y and 102z, respectively. A BS may support one or more cells. BS 110 communicates with user equipment (UE) 120a-y (each also individually referred to herein as UE 120 or collectively referred to as a plurality of UEs 120) in a wireless communication network 100. UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be fixed or mobile.

[0039] The wireless communication network 100 may also include a relay station (e.g., relay station 110r) (also referred to as a relay, etc.), which receives transmissions of data or other information from an upstream station (e.g., BS 110a or UE 120r) and sends transmissions of data or other information to a downstream station (e.g., UE120 or BS 110), or relays transmissions between UEs 120 to facilitate communication between devices.

[0040] A network controller 130 may couple to a set of base stations 110 and provide coordination and control for these base stations 110. The network controller 130 may communicate with the BSs 110 via a backhaul. The BSs 110 may also communicate with each other (eg, directly or indirectly) via a wireless or wired backhaul.

[0041] Figure 2 Shown is a block diagram illustrating an example base station (BS) and an example user equipment (UE) according to some aspects of the present disclosure.

[0042] At the BS 110, the transmit processor 220 may receive data from the data source 212 and control information from the controller / processor 240. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. The data may be for a physical downlink shared channel (PDSCH), etc. The processor 220 may process (e.g., encode and symbol map) the data and the control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a cell-specific reference signal (CRS). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, or reference symbols (if applicable), and may provide an output symbol stream to the modulators (MODs) 232a-232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a-232t may be transmitted via antennas 234a-234t, respectively.

[0043] At the UE 120, antennas 252a-252r can receive downlink signals from the BS 110 and can provide received signals to demodulators (DEMODs) in transceivers 254a-254r, respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator can further process the input samples (e.g., OFDM, etc.) to obtain received symbols. The MIMO detector 256 can obtain received symbols from all demodulators 254a-254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. The receive processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to the data sink 260, and provide decoded control information to the controller / processor 280.

[0044] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller / processor 280 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 264 may also generate reference symbols for a reference signal (e.g., a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by a demodulator in the transceiver 254a-254r (e.g., for SC-FDM, etc.), and transmitted to the BS 110. At the BS 110, the uplink signal from the UE 120 may be received by the antenna 234, processed by the modulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller / processor 240 .

[0045] Memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink or uplink.

[0046] The controller / processor 280 or other processors and modules at the UE 120 may perform or direct the execution of processes for the techniques described herein. Figure 2 As shown, the controller / processor 280 of the UE 120 has a Fig.11 Operation 1100 and / or Fig.12Similarly, the controller / processor 240 of the BS 110 has a processor that can be configured to perform Fig.12 The space preemption module 112 of the operation 1200. Although shown at the controller / processor, other components of the UE or BS may also be used to perform the operations described herein.

[0047] Figure 3 300 is a diagram showing an example of a frame format 300 for NR. The transmission timeline for each of the downlink and uplink may be segmented into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be segmented into 10 subframes, each of which is 1 ms and indexed from 0 to 9. Depending on the subcarrier spacing, each subframe may include a variable number of slots. Depending on the subcarrier spacing, each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols). The symbol period in each slot may be assigned an index. A mini slot (which may be referred to as a subslot structure) refers to a transmission time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols).

[0048] Each symbol in a time slot may indicate the link direction (e.g., DL, UL, or flexible) of data transmission, and the link direction of each subframe may be switched dynamically. The link direction may be based on the time slot format. Each time slot may include DL / UL data and DL / UL control information.

[0049] In NR, a synchronization signal (SS) block is transmitted. The SS block includes the PSS, SSS, and dual-symbol PBCH. In some cases, these signals are examples of the types of signals that a fake BS may forge in order to impersonate a legitimate BS. When masquerading as a legitimate BS, the fake BS may also forge other types of downlink transmissions (e.g., PDCCH, PDSCH).

[0050] SS blocks can be placed at fixed time slot positions (such as Figure 3 Symbols 0-3 shown in the figure). The UE can use PSS and SSS for cell search and acquisition. PSS can provide half-frame timing, and SS can provide CP length and frame timing. PSS and SSS can provide cell identification. PBCH carries some basic system information, such as downlink system bandwidth, timing information within a radio frame, SS burst set period, system frame number, etc. SS blocks can be organized into SS bursts to support beam scanning. Additional system information (such as remaining minimum system information (RMSI), system information block (SIB), other system information (OSI)) can be sent on the physical downlink shared channel (PDSCH) in certain subframes.

[0051] The UE may operate in various radio resource configurations, including configurations associated with sending pilots using dedicated resource sets (e.g., radio resource control (RRC) dedicated states, etc.), or configurations associated with sending pilots using common resource sets (e.g., RRC common states, etc.). When operating in the RRC dedicated state, the UE may select a dedicated resource set for sending pilot signals to the network. When operating in the RRC common state, the UE may select a common resource set for sending pilot signals to the network. In either case, the pilot signal sent by the UE may be received by one or more network access devices (such as an AN or DU or a portion thereof). Each receiving network access device may be configured to receive and measure pilot signals sent on the common resource set, and also receive and measure pilot signals sent on the dedicated resource set allocated to the UE for which the network access device is a member of the monitoring set of the network access device of the UE. One or more receiving network access devices or a CU receiving a measurement of a pilot signal to which (multiple) network access devices send the pilot signal may use the measurement to identify a serving cell for the UE, or to initiate a change in a serving cell for one or more UEs.

[0052] Figure 4A and Figure 4B A diagram of an example vehicle-to-everything (V2X) system is shown according to some aspects of the present disclosure. For example, Figure 4A and Figure 4B The illustrated vehicles may communicate via a sidelink channel and may perform sidelink CSI reporting as described herein.

[0053] Figure 4A and Figure 4B The V2X system provided in provides two complementary transmission modes. Figure 4A As shown in the example in , the first transmission mode involves direct communication (e.g., also called sidelink communication) between participants that are close to each other in a local area. Figure 4B As shown in the example in , the second transmission mode involves network communication through a network that can be implemented through a Uu interface (e.g., a wireless communication interface between a radio access network (RAN) and a UE).

[0054] refer to Figure 4A, a V2X system 400 (e.g., including vehicle-to-vehicle (V2V) communications) is shown with two vehicles 402, 404. A first transmission mode allows direct communication between different participants in a given geographic location. As shown, the vehicle can have a wireless communication link 406 with a person (V2P) (e.g., via a UE) through a PC5 interface. Communication between vehicles 402 and 404 can also occur through a PC5 interface 408. In a similar manner, communication can occur from vehicle 402 to other highway components (e.g., highway component 410) (such as a traffic signal or sign) (V2I) through a PC5 interface 412. For Figure 4A Each communication link shown allows for bidirectional communication between elements so that each element can be both a transmitter and receiver of information. The V2X system 400 can be a self-managed system that is implemented without the assistance of a network entity. The self-managed system can achieve increased spectrum efficiency, reduced costs, and increased reliability because no network service interruptions occur during handoff operations of moving vehicles. The V2X system can be configured to operate in a licensed or unlicensed spectrum so that any vehicle equipped with the system can access common frequencies and share information. This coordinated / common spectrum operation allows for safe and reliable operation.

[0055] Figure 4B A V2X system 450 is shown for communicating between a vehicle 452 and a vehicle 454 via a network entity 456. These network communications may occur via discrete nodes, such as base stations (e.g., eNBs or gNBs), which send and receive information to (e.g., relay information between) vehicles 452, 454. Network communications via vehicle-to-network (V2N) links 458 and 410 may be used, for example, for long-range communications between vehicles, such as for communicating the presence of a car accident some distance ahead along a road or highway. Nodes may send other types of communications to vehicles, such as traffic flow conditions, road hazard warnings, environmental / weather reports, and service station availability, among other examples. Such data may be obtained from a cloud-based sharing service.

[0056] In some cases, two or more subordinate entities (e.g., UE) can communicate with each other using side link signals. As described above, V2V and V2X communications are examples of communications that can be sent via side links. Other applications of side link communications may include public safety or service announcement communications, communications for proximity services, communications for UE to network relays, device to device (D2D) communications, Internet of Everything (IoE) communications, Internet of Things (IoT) communications, mission-critical mesh communications, and other suitable applications. Typically, a side link may refer to a direct link between a subordinate entity (e.g., UE1) and another subordinate entity (e.g., UE2). Thus, a side link may be used to send and receive communications (also referred to herein as "side link signals") without relaying communications through a scheduling entity (e.g., BS), even if the scheduling entity may be used for scheduling or control purposes. In some examples, side link signals may be transmitted using licensed spectrum (unlike wireless local area networks, which typically use unlicensed spectrum).

[0057] Various sidelink channels may be used for sidelink communications, including a physical sidelink discovery channel (PSDCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). The PSDCH may carry discovery expressions that enable neighboring devices to discover each other. The PSCCH may carry control signaling, such as sidelink resource configurations and other parameters for data transmission, and the PSSCH may carry data transmissions.

[0058] For operations on PSSCH, the UE performs transmission or reception in a slot on a carrier. The NR sidelink supports the case where all symbols in a slot are available for the sidelink for the UE, and another case where only a subset of consecutive symbols in a slot are available for the sidelink.

[0059] The PSFCH may carry feedback such as channel state information (CSI) related to the sidelink channel quality. A sequence-based PSFCH format with one symbol (excluding the AGC training period) may be supported. The following formats are possible: a PSFCH format based on PUCCH format 2 and a PSFCH format that spans all available symbols of the sidelink in a slot

[0060] Supporting preemption in systems with multiple service types

[0061] As mentioned above, NR supports multiple service types, such as eMBB and URLLC. In some cases, an ongoing eMBB transmission may be punctured or interrupted to send a higher priority URLLC transmission. This may result in a loss of phase coherence between two eMBB transmission durations that have been made discontinuous by the URLLC transmission. For example, on the uplink (UL), the URLLC may have different transmission powers, which may result in a loss of phase coherence. URLLC may be scheduled in different CCs or BWPs. If the UE has to tune out (multiple) RF chains to receive (on DL) or send (on UL) the URLLC, and then tune back to eMBB, this may result in a loss of phase coherence.

[0062] The indicator-based multiplexing approach is beneficial for both URLLC and eMBB UEs, albeit at the expense of indicator overhead. Figure 5A As shown, for the current indication relative to the URLLC, the preemption indication (PI) downlink control information (DCI) is provided simultaneously with the URLLC data. Figure 5B As shown, for post indications for both URLLC and eMBB, the PI DCI follows the URLLC and eMBB data. Figure 5C Shown is a post facto indication of URLLC which is current with respect to eMBB.

[0063] For DL ​​PI, a DCI format (e.g., DCI format 2_1) can be used to notify (multiple) physical resource blocks (PRBs) and (multiple) orthogonal frequency division multiplexing (OFDM) symbols where the UE can assume that there are no transmissions for the UE. For example, the gNB can schedule an eMBB UE during a time slot. In the middle of the time slot, a packet for a URLLC UE arrives, and the gNB schedules and sends the packet to the URLLC UE in a subset of resource blocks (RBs) and / or time slots. The gNB provides an indication to the eMBB UE via the DL PI (e.g., in the next time slot) about which RB / symbol is punctured (e.g., and used for URLLC UEs). The eMBB UE can therefore use this information to enhance decoding (this knowledge can increase the chance of successful decoding).

[0064] like Figure 6 As shown, information (e.g., PI 1, PI 2, ..., PI N) is sent via DCI format 2_1 with a cyclic redundancy check (CRC) scrambled by an interrupt radio network temporary identifier (INT-RNTI). In NR, each preemption indication can be 14 bits. Figure 6 As shown, for each UE, different preemption indications may correspond to different component carriers (or serving cells).

[0065] Figure 7 An overview of sidelink communications (broadcast and multicast device-to-device (D2D)) between UEs is provided. As mentioned above, reference Figure 4A and Figure 4B ,A side link generally refers to a link between at least two users or ,user relays, which can be used in different scenarios and different ,applications.

[0066] For example, for applications with in-coverage operation, both users are within the coverage of the gNB but still communicate directly. This can be assumed to enable some gaming applications, for example. For applications with partial coverage operation, one UE is in coverage and acts as a relay to extend coverage for other users. For applications with out-of-coverage operation, the users are outside the coverage of the gNB but still need to communicate. This type of operation is very important for mission-critical applications such as vehicle-to-everything (V2X) and public safety.

[0067] like Figure 7 As shown, resource allocation for sidelink (SL) communication can be done in different ways. In the first mode (Mode 1), the gNB "schedules" the SL resources to be used by the UE for SL transmission.

[0068] For the second mode (Mode 2), the UE determines the SL resources (e.g., the gNB does not schedule SL transmission resources within the SL resources configured by the gNB / network). In this case, the UE autonomously selects the SL resources for transmission. The UE can assist other UEs in SL resource selection. The UE can be configured with an NR configuration grant for SL transmission, and the UE can schedule SL transmission for other UEs.

[0069] Various scenarios may be encountered involving sidelink communications and communications involving the cellular link (Uu) between the UE and the gNB. In one scenario (i.e., scenario 1), for licensed bands, NR Uu and NR SL can transmit / receive concurrently on the same carrier. In the second scenario (scenario 2), for some other applications (such as public safety or V2X), dedicated (licensed or unlicensed) carriers (e.g., Intelligent Transport System (ITS) for V2X), NR Uu and NR SL can transmit / receive on different carriers.

[0070] For both cases (eg, when Uu and SL should coexist on a given carrier or multiple carriers), the applicability of DLPI and ULPI should be considered. It should be noted that a DLPI or ULPI received on one carrier may be applicable to the same or different carriers.

[0071] The DLPI in Rel.15NR is a post-indication scheme (e.g. Figure 5BThe gNB may have reclaimed resources to schedule more urgent traffic (e.g., URLLC for another UE).

[0072] ULPI was introduced in Rel.16NR and can be used, for example, to pause uplink transmissions of eMBB users. In some cases, the gNB may decide to mute eMBB users in order to schedule URLLC users on previously allocated resources and may signal the ULPI accordingly.

[0073] QCL port and TCI status

[0074] In some cases, the UE may be configured with up to M TCI states through higher layer signaling to decode the Physical Downlink Shared Channel (PDSCH) based on a detected Physical Downlink Control Channel (PDCCH) with Downlink Control Information (DCI). Each configured Transmission Configuration Indication (TCI) state includes an RS set TCI-RS-SetConfig. Figure 8A-8B , Figure 9A-9B and Figure 10A-10B An example of such a TCI-RS-SetConfig associating a DL reference signal with a corresponding quasi co-location (QCL) type is shown.

[0075] In the figure, a source reference signal (RS) is indicated in the top box and is associated with a target signal indicated in the bottom box. In other words, the UE can determine various channel parameters using the source RS depending on the associated QCL type to process the target signal.

[0076] As shown, each TCI-RS-SetConfig contains parameters for configuring the quasi-co-location relationship between the reference signals in the RS set and the demodulation reference signal (DMRS) port group of the PDSCH. The RS set contains references to one or two DL RSs and the associated quasi-co-location type (QCL type) of each DL RS configured by the higher-layer parameter QCL-Type.

[0077] like Figure 8B As shown, for the case of two DL RSs, the QCL type may be different, regardless of whether the same DL RS is referenced or different DL RSs are referenced. In the example shown, for P-TRS, SSB is associated with Class C QCL, while beam-managed CSI-RS (CSIRS-BM) is associated with Class D QCL.

[0078] The Quasi Co-location (QCL) type indicated to the UE is based on the higher layer parameter QCL-Type and can be one or a combination of the following types:

[0079] QCL-TypeA: {Doppler shift, Doppler spread, average delay, delay spread}

[0080] QCL-TypeB: {Doppler shift, Doppler spread}

[0081] QCL-TypeC: {average delay, Doppler shift}

[0082] QCL-TypeD: {spatial reception parameters}

[0083] It can be noted that the target RS does not necessarily need to be the DMRS of the PDSCH, but can be any other RS: PUSCH DMRS, CSIRS, TRS and SRS.

[0084] like Fig. 10A and Fig. 10B As shown, TCI states may also be supported for situations with multiple transmitter receiver points (mTRP) or multiple panels. In some cases, for TCI state configuration, in order to enable one or two TCI states for each TCI code point, MAC-CE enhancements may be used to map one or two TCI states for a TCI code point, and / or the number of bits of the TCI field in the DCI may be increased.

[0085] Example space preemption for downlink, uplink, and sidelink

[0086] Various aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for signaling and processing indications of spatial preemption, such as spatial preemption indications (PIs). As will be described in more detail below, spatial PIs may indicate to a user equipment (UE) to avoid at least one beam for transmitting or receiving a target signal.

[0087] As proposed herein, an uplink (UL) spatial PI can advantageously indicate which type of reference signal is preempted for the purpose of determining a transmit beam for UL transmissions. For example, the indicated type can be a channel state information reference signal (CSI-RS), a synchronization signal block (SSB), a sounding reference signal (SRS), or some other downlink (DL) or UL signal, and the identification number can be, for example, a CSI-RS identifier (ID) or an SSB index. Similarly, a DL spatial PI can effectively indicate which type of reference signal (and ID number) is preempted for the purpose of determining a receive beam for receiving DL transmissions. Such spatial preemption can be used as an alternative (or supplement) to conventional UL / DL preemption of time / frequency resources.

[0088] Fig.11 Example operations 1100 of wireless communications by a UE are shown in accordance with some aspects of the present disclosure. For example, operations 1100 may be performed by Figure 1 The UE 120a or 120b executes to process the spatial PI (eg, determine a Tx beam to avoid for uplink transmission or an Rx beam to avoid for DL ​​reception).

[0089] Operations 1100 begin at 1102 with receiving signaling of a spatial preemption indication (PI). At 1104, the UE identifies at least one beam that the UE is preempted from using to transmit or receive at least one of at least one target signal based on the spatial PI. At 1106, the UE refrains from using the identified beam to transmit or receive the target signal for at least a period of time.

[0090] Fig.12 Example operations 1200 of wireless communication by an apparatus are shown. For example, operations 1200 may be performed by Figure 1 The UE 120 a, UE 120 b and / or BS 110 a may be used to provide the spatial PI (to the UE).

[0091] Operations 1200 begin, at 1202, by identifying at least one beam corresponding to a direction that at least one UE is to avoid for transmitting or receiving at least one of a target signal. At 1204, the apparatus sends signaling to the UE indicating a spatial PI of the at least one beam.

[0092] Instead of preempting certain time / frequency resources as conventional UL / DL PI does, the spatial PI proposed herein can advantageously preempt any signal transmitted using a specific beam (in other words, in a specific transmit or receive beam direction).

[0093] For example, the UL spatial PI may effectively contain which SSB / CSIRS / SRS ID is preempted for the purpose of determining the transmit (Tx) beam for UL transmission. In other words, the UL spatial PI may be interpreted as the UE avoiding the use of SRS, physical uplink shared channel (PUSCH) and / or physical uplink control channel (PUCCH) resources that have specific spatial relationship information configured for determining the Tx beam within a certain time period.

[0094] However, it may be noted that this UL PI may not mean that the indicated RS is necessarily preempted. Instead, what is preempted is the transmission of any other physical layer (PHY) channel that uses the indicated RS to derive the Tx spatial beam.

[0095] When the UL spatial PI prevents the UE from using the configured beam for Tx, it has various options for the corresponding SRS / PUSCH / PUCCH that should have been sent with the Tx beam. According to one option, the spatial PI can be interpreted to mean that these SRS resources are also preempted (and not sent), or some other SSB / CSI-RS / SRS ID can be used (to determine the Tx beam to) send these SRS resources. In this case, the UL PI can indicate this information.

[0096] According to another option, the spatial PI can be interpreted as meaning that some other SSB / CSIRS / SRSID should be used to transmit these SRS resources (e.g., the spatial Tx PI should contain this information, or it can be some default beam). According to another option, the spatial PI can be interpreted as meaning that the Tx beam used for physical random access channel (PRACH) transmission during the most recent initial access in the cellular network (Uu) should be used.

[0097] As described above, the DL spatial PI can advantageously indicate which type of reference signal is preempted for the purpose of determining the receive beam for receiving DL transmissions. As described above, each TCI state can be configured with a source RS (SSB or CS-IRS), and this is used by the UE to derive the spatial Rx beam to receive the target RS contained in the TCI state.

[0098] Then, if the gNB notifies that the source RS cannot be used for DL ​​beam transmission, it can signal the DL spatial PI. The DL spatial PI may mean that the corresponding target DL signal is preempted, the source RS cannot be used by the UE to derive the spatial Rx beam, and / or the same source signal can still be transmitted but with a different Tx beam, in which case the UE should change the Rx beam accordingly.

[0099] As above reference Fig. 10A and Fig. 10B As described above, for multi-TRP or multi-panel deployments, multiple spatial quasi-co-location (QCL) RSs may be defined. Thus, in the event that one of the spatially related (or QCL Type-D) sources associated with a certain PHY channel (e.g., multi-TRP PDSCH) is to be preempted, a spatial PI may be signaled.

[0100] In this case, there are various options for how to interpret the spatial PI. For example, according to one option, the spatial PI may mean that only a subset of the ports are preempted (e.g., a rank 4 transmission becomes a rank 2 transmission if one of the directions is preempted). If only a subset of the ports are transmitted, then for the case of PDSCH, the rate matching can be adjusted accordingly. For the case of CSI-RS, the power boost of the remaining ports can be adjusted accordingly.

[0101] According to another option, spatial PI may mean that another beam should replace the preempted beam (and all ports can still be transmitted).

[0102] For sidelink communications, the gNB can send spatial PI to a group of UEs via group-common DCI, such as Fig.13A In this case, for all UEs in the group, the spatial PI can preempt (multiple) transmissions in the spatial direction or receptions from the spatial direction.

[0103] like Fig. 13B As shown, in the case of partial coverage, the gNB can request the SL UE (e.g., UE1) to relay the spatial PI (as a physical sidelink control channel (PSCCH) group common message) through the SL. In this case, the gNB first triggers the spatial PI to UE1 with information about which UEs (or SL services) UE1 is responsible for relaying.

[0104] like Fig. 13C As shown, the gNB can not only preempt the spatial direction of the gNB transmission, but also the spatial direction of the UE1 transmission towards the SL UE. In this case, the spatial PI indication can contain the RS ID of UE1 corresponding to the SL BWP. Therefore, the spatial PI indication of the SL spatial beam (of gNB1 or UE1) can be received from the SL bandwidth part (BWP) or the Uu BWP.

[0105] In some cases, the spatial PI indication may be applicable to a given time period. For example, the time period may be a time period during which a spatial beam is preempted (e.g., continuous spatial PI), preempted for "one slot" of a PHY channel in a current slot (current spatial PI), or preempted for "one slot" of a PHY channel in a previous slot (post-spatial PI).

[0106] The spatial PI can be applied to various types of DL signals, such as CSIRS, TRS, DL PRS, DMRS, PDSCH and PDCCH. The spatial PI can be applied to various types of UL signals, such as SRS, PUSCH, PUCCH, UL PRS and DMRS. The spatial PI can be applied to various types of side link (SL) signals, such as PSSCH, PSCCH, PSFCH.

[0107] Example Embodiments

[0108] Embodiment 1: A method for wireless communication by a user equipment (UE), comprising: receiving signaling of a spatial preemption indication (PI); identifying at least one beam in which the UE is preempted and cannot be used to send or receive at least one of at least one target signal based on the spatial PI; and suppressing the use of the identified beam to send or receive the target signal for at least a period of time.

[0109] Embodiment 2: A method according to embodiment 1, wherein the UE identifies the beam based on a spatial relationship between a source reference signal and a target signal.

[0110] Embodiment 3: A method according to embodiment 2, wherein the target signal includes at least one of an uplink physical channel or a sidelink physical signal, and the UE is configured to suppress transmitting the uplink physical channel or the sidelink channel using a transmit beam derived from a source reference signal.

[0111] Embodiment 4: A method according to Embodiment 3, wherein the UE is configured to skip transmitting an uplink physical channel or a side link channel, or to determine an alternative transmit beam for transmitting an uplink physical channel or a side link channel, the alternative transmit beam being signaled using a spatial PI, or a default transmit beam being used as an alternative transmit beam, the default transmit beam including a transmit beam used for physical random access channel (PRACH) transmission during a previous initial network access.

[0112] Embodiment 5: A method according to any one of Embodiments 2-4, wherein the target signal includes at least one of a downlink physical channel or a sidelink physical signal, and the UE is configured to suppress receiving the downlink physical channel or the sidelink channel using a receiving beam derived from a source reference signal.

[0113] Embodiment 6: A method according to embodiment 5, wherein the UE is configured to skip processing a downlink physical channel or a side link channel, or to determine an alternative receiving beam for processing a downlink physical channel or a side link channel, and one of the following: the alternative receiving beam is signaled using a spatial PI, or a default receiving beam is used as an alternative receiving beam, which default receiving beam includes a receiving beam used for a previous initial network access.

[0114] Embodiment 7: A method according to any one of embodiments 1-6, wherein the UE identifies a beam based on one of multiple spatial relationships between at least two source reference signals and a target signal, wherein the at least two source reference signals are associated with different transmitter receiver points or different antenna panels, and the spatial PI indicates the one of the multiple spatial relationships.

[0115] Embodiment 8: A method according to any one of embodiments 1-7, wherein the spatial PI indicates that only a subset of ports are preempted for sending or receiving a target signal.

[0116] Embodiment 9: A method according to embodiment 8, wherein the target signal includes a physical downlink shared channel, and the UE is configured to perform rate matching for the physical downlink shared channel (PDSCH) based on a subset of the preempted ports, or the target signal includes a channel state information reference signal (CSI-RS) with power boost adjusted on one or more remaining ports that are not preempted.

[0117] Embodiment 10: The method according to any one of embodiments 1-9, wherein the spatial PI indicates that another beam replaces the identified beam, and no port is preempted for sending or receiving the target signal.

[0118] Embodiment 11: A method according to any one of embodiments 1-10, wherein the spatial PI is signaled to a group of UEs communicating via a sidelink channel via a group common downlink control information (DCI) transmission.

[0119] Embodiment 12: A method according to any one of embodiments 1-11, wherein the UE is further configured to relay the spatial PI to one or more other UEs via a side link channel.

[0120] Embodiment 13: A method according to any one of Embodiments 1-12, wherein the at least one target signal includes at least one target side link signal, and the UE identifies the beam based on the spatial relationship between the side link reference signal identified in the spatial PI and the target side link signal.

[0121] Embodiment 14: The method according to embodiment 13, wherein the spatial PI is received via at least one of a sidelink bandwidth part (BWP) or a BWP used for communication between the UE and the base station.

[0122] Embodiment 15: A method according to any one of embodiments 1-14, wherein the time period is associated with a time period during which the spatial PI is valid until further signaling indicates otherwise, a current transmission time interval (TTI), or a previous TTI.

[0123] Embodiment 16: A method according to any one of embodiments 1-15, wherein the target signal includes a downlink signal, and the downlink signal includes at least one of the following items: a channel state information reference signal (CSI-RS), a timing reference signal (TRS), a downlink positioning reference signal (DL PRS), a demodulation reference signal (DMRS), a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).

[0124] Embodiment 17. A method according to embodiment 1, wherein the target signal includes an uplink signal, and the uplink signal includes at least one of the following: a sounding reference signal (SRS), a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), an uplink positioning reference signal (UL PRS) or a demodulation reference signal (DMRS).

[0125] Embodiment 18: A method according to any one of embodiments 1-17, wherein the target signal includes a side link signal, and the side link signal includes at least one of the following: a physical side link shared channel (PSSCH), a physical side link control channel (PSCCH) or a physical side link feedback channel (PSFCH).

[0126] Embodiment 19: A method for wireless communication performed by a device, comprising: identifying at least one beam corresponding to a direction that at least one user equipment (UE) wants to avoid using to send or receive at least one of target signals, and sending signaling of a spatial preemption indication (PI) indicating at least one beam to the UE.

[0127] Embodiment 20: A method according to embodiment 19, wherein the spatial PI indicates the beam based on the spatial relationship between the source reference signal and the target signal.

[0128] Embodiment 21: A method according to embodiment 20, wherein the target signal includes at least one of an uplink physical channel or a sidelink physical signal, and the spatial PI indicates that the UE is to suppress using a transmit beam derived from a source reference signal to transmit the uplink physical channel or the sidelink channel.

[0129] Embodiment 22: A method according to embodiment 20 or 21, wherein the spatial PI indicates that the UE is to skip sending an uplink physical channel or a side link channel, or to determine an alternative transmission beam for sending an uplink physical channel or a side link channel, and the alternative transmission beam is signaled using the spatial PI.

[0130] Embodiment 23: A method according to any one of embodiments 20-22, wherein the target signal includes at least one of a downlink physical channel or a sidelink physical signal, and the spatial PI indicates that the UE is to suppress receiving the downlink physical channel or the sidelink channel using a receive beam derived from a source reference signal.

[0131] Embodiment 24: A method according to any one of embodiments 20-23, wherein the spatial PI indicates that the UE is to skip processing a downlink physical channel or a side link channel, or to determine an alternative receiving beam for processing a downlink physical channel or a side link channel.

[0132] Embodiment 25: A method according to embodiment 24, wherein the alternative receiving beam is signaled using spatial PI.

[0133] Embodiment 26: A method according to any one of embodiments 19-25, wherein the spatial PI indicates that the UE is to identify a beam based on one of multiple spatial relationships between at least two source reference signals and a target signal, wherein the at least two source reference signals are associated with different transmitter receiver points or different antenna panels, and the spatial PI indicates the one of the multiple spatial relationships.

[0134] Embodiment 27: A method according to any one of embodiments 19-26, wherein the spatial PI indicates that only a subset of ports are preempted for sending or receiving target signals.

[0135] Embodiment 28: A method according to embodiment 27, wherein the target signal includes a physical downlink shared channel, and the spatial PI indicates that the UE is to perform rate matching for the physical downlink shared channel (PDSCH) based on a subset of the preempted ports.

[0136] Embodiment 29: A device for wireless communication, comprising: a component for receiving signaling of a spatial preemption indication (PI); a component for identifying, based on the spatial PI, at least one beam in which the device is preempted and cannot be used to send or receive at least one of at least one target signal; and a component for suppressing the use of the identified beam to send or receive the target signal for at least a period of time.

[0137] Embodiment 30: An apparatus for wireless communication, comprising: a component for identifying at least one beam corresponding to a direction that at least one user equipment (UE) wants to avoid using to send or receive at least one of target signals, and a component for sending signaling of a spatial preemption indication (PI) indicating at least one beam to the UE.

[0138] Embodiment 31: A device for wireless communication by a UE, comprising a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to: receive signaling of a spatial PI, identify at least one beam that the UE is preempted and cannot use to send or receive at least one of at least one target signal based on the spatial PI, and suppress the use of the identified beam to send or receive the target signal for at least a period of time.

[0139] Embodiment 32: A computer-readable medium having instructions stored thereon, the instructions being used to: receive signaling of a spatial PI, identify at least one beam on which a UE is preempted and cannot be used to send or receive at least one of at least one target signal based on the spatial PI, and suppress the use of the identified beam to send or receive the target signal for at least a period of time.

[0140] Embodiment 33: A device for wireless communication by the device, comprising a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to: identify at least one beam corresponding to a direction that at least one UE wants to avoid using to send or receive at least one of the target signals, and send signaling indicating the spatial PI of the at least one beam to the UE.

[0141] Embodiment 34. A computer-readable medium having stored thereon instructions for: identifying at least one beam corresponding to a direction that at least one UE wants to avoid using to send or receive at least one of the target signals, and sending signaling to the UE indicating the spatial PI of the at least one beam.

[0142] The techniques described herein can be used for various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), Advanced LTE (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SCDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, and the like. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks can implement radio technologies such as NR (e.g. 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use EUTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). NR is an emerging wireless communication technology under development.

[0143] The techniques described herein can be used for the above wireless networks and radio technologies as well as other wireless networks and radio technologies. For clarity, although terms commonly associated with 3G, 4G or 5G wireless technologies may be used herein to describe various aspects, various aspects of the present disclosure may be applied to other communication systems based on generations.

[0144] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) or a NB subsystem serving the coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and BS, next-generation NodeB (gNB or gNodeB), access point (AP), distributed unit (DU), carrier or transmit receive point (TRP) can be used interchangeably. The BS can provide communication coverage for macro cells, pico cells, femto cells or other types of cells. A macro cell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access to UEs with service subscriptions. A pico cell can cover a relatively small geographic area and can allow unrestricted access to UEs with service subscriptions. A femto cell can cover a relatively small geographic area (e.g., a home) and can allow UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.) to have restricted access. The BS of a macro cell can be called a macro BS. The BS of a pico cell can be called a pico BS. The BS of a femto cell can be called a femto BS or a home BS.

[0145] UE may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, customer premises equipment (CPE), cellular phone, smart phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical equipment, biosensor / device, wearable device (such as smart watch, smart clothes, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music device, video device, satellite radio, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, global positioning system device, or any other suitable device configured to communicate via wireless or wired medium. Some UEs may be considered as machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices, which can be narrowband IoT (NB-IoT) devices.

[0146] Some wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier can be modulated with data. Typically, modulation symbols are sent using OFDM in the frequency domain and SC-FDM in the time domain. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the spacing of the subcarriers can be 15kHz, and the minimum resource allocation (called a "resource block" (RB)) can be 12 subcarriers (or 180kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal fast Fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (e.g., 6 RBs), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, respectively. In LTE, the basic transmission time interval (TTI) or packet duration is a subframe of 1 ms.

[0147] NR can utilize OFDM with CP on both the uplink and downlink, and includes support for half-duplex operation using TDD. In NR, the subframe is still 1ms, but the basic TTI is called a time slot. Depending on the subcarrier spacing, the subframe contains a variable number of time slots (e.g., 1, 2, 4, 8, 16...time slots). NR RB is 12 consecutive frequency subcarriers. NR can support a basic subcarrier spacing of 15KHz, and other subcarrier spacings can be defined relative to the basic subcarrier spacing, such as 30kHz, 60kHz, 120kHz, 240kHz, etc. The symbol and time slot lengths are proportional to the subcarrier spacing. The CP length also depends on the subcarrier spacing. Beamforming can be supported, and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. In some examples, the MIMO configuration in DL can support up to 8 transmit antennas with up to 8 streams and up to 2 streams per UE for multi-layer DL transmission. In some examples, multi-layer transmission of up to 2 streams per UE can be supported. Up to 8 serving cells may be utilized to support aggregation of multiple cells.

[0148] In some examples, access to the air interface can be scheduled. The scheduling entity (e.g., BS) allocates resources for communications among some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities utilize resources allocated by the scheduling entity. The base station is not the only entity that can act as a scheduling entity. In some examples, the UE may act as a scheduling entity, and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may utilize the resources scheduled by the UE for wireless communications. In some examples, the UE may act as a scheduling entity in a peer-to-peer (P2P) network or a mesh network. In the mesh network example, in addition to communicating with the scheduling entity, the UEs may also communicate directly with each other.

[0149] As used herein, the term "determining" may encompass one or more of a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), assuming, etc. In addition, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. In addition, "determining" may include parsing, selecting, choosing, establishing, etc.

[0150] As used herein, the use of "or" is intended to be interpreted in an inclusive sense unless expressly indicated otherwise. For example, "a or b" may include only a, only b, or a combination of a and b. As used herein, phrases referring to "at least one" or "one or more" of a list of items refer to any combination of those items, including individual members. For example, "at least one of a, b, or c" is intended to cover the following possibilities: only a, only b, only c, a combination of a and b, a combination of a and c, a combination of b and c, and a combination of a, b, and c.

[0151] The various illustrative components, logic, logic blocks, modules, circuits, operations, and algorithmic processes described in conjunction with the embodiments disclosed herein may be implemented as electronic hardware, firmware, software, or a combination of hardware, firmware, or software, including the structures disclosed in this specification and their structural equivalents. The interchangeability of hardware, firmware, and software has been generally described in terms of functionality and is illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented in hardware, firmware, or software depends on the specific application and the design constraints imposed on the overall system.

[0152] Various modifications to the embodiments described in this disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Therefore, the claims are not intended to be limited to the embodiments shown herein, but are to be accorded the broadest scope consistent with the disclosure, the principles and novel features disclosed herein.

[0153] In addition, various features described in this specification in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any suitable subcombination. Thus, although features may be described above as functioning in a particular combination, and even initially claimed as such, one or more features from a claimed combination may in some cases be deleted from that combination, and a claimed combination may be directed to a subcombination or a variation of a subcombination.

[0154] Similarly, although operations are described in a specific order in the accompanying drawings, this should not be understood as requiring these operations to be performed in the specific order or sequential order shown, or requiring all operations shown to be performed to obtain desired results. In addition, the accompanying drawings can schematically depict one or more example processes in the form of a flow chart or a flowchart. However, other operations not shown can be incorporated into the schematically shown example process. For example, one or more additional operations can be performed before, after, simultaneously or between any of the operations shown. In some cases, multitasking and parallel processing may be advantageous. In addition, the separation of various system components in the above-mentioned embodiments should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and system can usually be integrated together in a single software product or packaged in multiple software products.

Claims

1. A method for wireless communication by a user equipment (UE), include: Receiving signaling of a space preemption indication (PI); identifying, based on the spatial PI, at least one beam in which the UE is preempted from transmitting or receiving at least one of the at least one target signal; refraining from using the identified at least one beam to transmit or receive the at least one target signal for at least a period of time; as well as An alternative beam for transmitting or receiving the at least one target signal is determined, wherein a default beam is used as the alternative beam.

2. The method according to claim 1, in, Identifying the at least one beam includes identifying the at least one beam based on a spatial relationship between a source reference signal and the at least one target signal.

3. The method according to claim 2, in: The at least one target signal comprises at least one of an uplink physical channel or a sidelink physical channel; as well as Refraining from using the identified at least one beam includes refraining from using a transmit beam derived from the source reference signal to transmit the uplink physical channel or the sidelink physical channel.

4. The method according to claim 1, in: The candidate beams are signaled using the spatial PI.

5. The method according to claim 2, in: The at least one target signal comprises at least one of a downlink physical channel or a sidelink physical channel; as well as Refraining from using the identified at least one beam includes refraining from using a receive beam derived from the source reference signal to receive the downlink physical channel or the sidelink physical channel.

6. The method according to claim 1, in: The default beam includes a beam used for a previous initial network access.

7. The method according to claim 1, in: Identifying the at least one beam comprises identifying the at least one beam based on one of a plurality of spatial relationships between at least two source reference signals and the at least one target signal, wherein the at least two source reference signals are associated with different transmitter receiver points or different antenna panels; and The spatial PI indicates the one of the plurality of spatial relationships.

8. The method according to claim 1, in, The spatial PI indicates that only a subset of ports are preempted for sending or receiving the at least one target signal.

9. The method according to claim 8, in: The at least one target signal comprises a physical downlink shared channel; and The UE is configured to perform rate matching for a physical downlink shared channel (PDSCH) based on a subset of preempted ports; or The at least one target signal comprises a channel state information reference signal (CSI-RS), wherein the CSI-RS has a power boost adjusted on one or more remaining ports that are not preempted.

10. The method according to claim 1, in, The spatial PI indicates that the candidate beam replaces the at least one identified beam, and no port is preempted for transmitting or receiving the at least one target signal.

11. The method according to claim 1, in: The spatial PI is signaled via a group common downlink control information (DCI) transmission to a group of UEs communicating via a sidelink channel.

12. The method according to claim 1, in, Also included is relaying the spatial PI to one or more other UEs via a sidelink channel.

13. The method according to claim 1, in: The at least one target signal comprises at least one target side link signal; as well as Identifying the at least one beam includes identifying the at least one beam based on a spatial relationship between a sidelink reference signal identified in the spatial PI and the at least one target sidelink signal.

14. The method according to claim 13, in, The spatial PI is received via at least one of the following: Sidelink Bandwidth Part (BWP); or BWP used for communication between UE and base station.

15. The method according to claim 1, in, The time periods are associated with: The spatial PI is valid until the time period during which other signaling indicates otherwise; The current transmission time interval (TTI); or Previously TTI.

16. The method according to claim 1, in, The at least one target signal includes a downlink signal, and the downlink signal includes at least one of the following: a channel state information reference signal (CSI-RS), a timing reference signal (TRS), a downlink positioning reference signal (DL PRS), a demodulation reference signal (DMRS), a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).

17. The method according to claim 1, in, The at least one target signal comprises an uplink signal, the uplink signal comprising at least one of: a sounding reference signal (SRS), a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), an uplink positioning reference signal (UL PRS), or a demodulation reference signal (DMRS).

18. The method according to claim 1, in, The at least one target signal comprises a sidelink signal comprising at least one of a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), or a physical sidelink feedback channel (PSFCH).

19. The method of claim 1, further comprising transmitting the at least one target signal via the alternative beam during the time period.

20. A method of wireless communication by a device, include: identifying at least one beam corresponding to a direction that at least one user equipment (UE) is to avoid for at least one of transmitting or receiving a target signal; sending signaling indicating a spatial preemption indication (PI) of the at least one beam to the UE; as well as An alternative beam for transmitting or receiving the target signal is determined, wherein a default beam is used as the alternative beam.

21. The method according to claim 20, in, The spatial PI indicates the at least one beam based on a spatial relationship between a source reference signal and the target signal.

22. The method according to claim 21, in: The target signal comprises at least one of an uplink physical channel or a sidelink physical channel; and The spatial PI instructs the UE to refrain from transmitting the uplink physical channel or the sidelink physical channel using a transmit beam derived from the source reference signal.

23. The method according to claim 20, in: The candidate beams are signaled using the spatial PI.

24. The method according to claim 21, in: The target signal comprises at least one of a downlink physical channel or a sidelink physical channel; and The spatial PI indicates that the UE is to refrain from using a receive beam derived from the source reference signal to receive the downlink physical channel or the sidelink physical channel.

25. The method according to claim 20, in: The spatial PI instructs the UE to identify the at least one beam based on one of a plurality of spatial relationships between at least two source reference signals and the target signal, wherein the at least two source reference signals are associated with different transmitter receiver points or different antenna panels; and The spatial PI indicates the one of the plurality of spatial relationships.

26. The method according to claim 20, in, The spatial PI indicates that only a subset of ports are preempted for sending or receiving the target signal.

27. The method according to claim 26, in: The target signal comprises a physical downlink shared channel; and The spatial PI indicates that the UE is to perform rate matching for a physical downlink shared channel (PDSCH) based on a subset of preempted ports.

28. The method according to claim 20, further comprising: include: The target signal is transmitted via the alternative beam.

29. An apparatus for wireless communication, include: means for receiving signalling of a space preemption indication (PI); means for identifying, based on the spatial PI, at least one beam in which the apparatus is preempted from transmitting or receiving at least one of the at least one target signal; means for refraining from using the identified at least one beam to transmit or receive the at least one target signal for at least a period of time; as well as Means for determining an alternative beam for transmitting or receiving the at least one target signal, wherein a default beam is used as the alternative beam.

30. An apparatus for wireless communication, include: means for identifying at least one beam corresponding to a direction that at least one user equipment (UE) is to avoid for at least one of transmitting or receiving a target signal; means for sending signaling indicating a spatial preemption indication (PI) of the at least one beam to the UE; as well as means for determining an alternative beam for transmitting or receiving the target signal, wherein a default beam is used as the alternative beam.

31. An apparatus for wireless communication by a user equipment (UE), comprising: A memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to perform the method according to any one of claims 1-19.

32. A device for wireless communication by a device, comprising: A memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to perform the method according to any one of claims 20-28.

33. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a user equipment (UE) to cause the processors to perform the method according to any one of claims 1-19.

34. A computer readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a device to cause the processor to perform the method according to any one of claims 20-28.

Images