QCL assumptions for combined single-DCI and multi-DCI multi-TRP

Abstract

Certain aspects of the present disclosure provide techniques for quasi-co-location (QCL) assumptions, such as QCL assumptions for combined single DCI (downlink control information) and multi-DCI mTRP (multiple transmission reception point) scenarios. A method that may be performed by a user equipment (UE) includes receiving signaling to configure the UE with a first index value associated with a first plurality of control resource sets (CORESETs) and a second index value associated with a second plurality of CORESETs. The UE may receive at least one medium access control (MAC) control element (CE) that activates a transmission configuration indicator (TCI) state set, indicates one of a first index value or a second index value, and maps at least one TCI code point in downlink control information (DCI) to two TCI states. The UE may determine one or more TCI states to be used for receiving one or more transmissions based at least in part on the mapping.

Description

Technical Field

[0001] Various aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for quasi-colocation (QCL) assumptions, such as QCL assumptions for combined single DCI (downlink control information) and multi-DCI mTRP (multiple transmission reception point) scenarios. Background Art

[0002] 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 (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, to name a few.

[0003] 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., 5GNR) 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 increasing 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.

[0004] However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to NR and LTE technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies. Summary of the invention

[0005] The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of the present disclosure as expressed by the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description," one will understand how the features of the present disclosure provide advantages including improved quasi-co-located (QCL) assumptions, such as QCL assumptions for combined single DCI (downlink control information) and multi-DCI mTRP (multiple transmission reception point) scenarios.

[0006] 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 to configure the UE with a first index value associated with a first plurality of control resource sets (CORESETs) and a second index value associated with a second plurality of CORESETs. The method generally includes receiving at least one medium access control (MAC) control element (CE) that activates a transmission configuration indicator (TCI) state set, indicating one of a first index value or a second index value, and mapping at least one TCI code point in downlink control information (DCI) to two TCI states. The method generally includes determining one or more TCI states to be used for receiving one or more transmissions based at least in part on the mapping.

[0007] Aspects of the present disclosure provide components of an apparatus, processor, and computer-readable medium for performing the methods described herein.

[0008] Aspects of the present disclosure provide means of apparatus, processors, and computer-readable media for performing techniques and methods that may be complementary to the operations of a UE (eg, a BS) described herein.

[0009] To achieve the foregoing and related ends, 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 certain 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

[0010] In order to be able to understand in detail the manner in which the above-mentioned features of the present disclosure are achieved, a more particular description of the above brief overview may be obtained by reference to various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the accompanying drawings illustrate only certain typical aspects of the present disclosure and are therefore not to be considered limiting of its scope, as the description may admit of other equally effective aspects.

[0011] Figure 1is a block diagram conceptually illustrating an example wireless communication network in accordance with certain aspects of the present disclosure.

[0012] Figure 2 is a block diagram conceptually illustrating designs of example base stations (BSs) and user equipment (UEs) in accordance with certain aspects of the present disclosure.

[0013] Figure 3 is an example frame format for certain wireless communication systems (e.g., New Radio (NR)) in accordance with certain aspects of the present disclosure.

[0014] Figure 4 is a call flow diagram illustrating example signaling for a single transmission reception point (TRP) physical downlink shared channel (PDSCH) quasi-co-location (QCL) assumption in accordance with certain aspects of the present disclosure.

[0015] Figure 5 is a call flow diagram illustrating example signaling for multiple downlink control information (mDCI) multiple TRP (mTRP) PDSCH QCL assumption in accordance with certain aspects of the present disclosure.

[0016] Figure 6 is an example mDCI mTRP scenario in accordance with certain aspects of the present disclosure.

[0017] Fig. 7A is an example transmission configuration indicator (TCI) code point mapped to a single TCI state for a first control resource set (coreset) pool index value in an mDCI mTRP scenario in accordance with certain aspects of the present disclosure.

[0018] Figure 7B is an example TCI code point mapped to a single TCI state for a second coreset pool index value in an mDCI mTRP scenario in accordance with certain aspects of the present disclosure.

[0019] Figure 8 is a call flow diagram illustrating example signaling for a single DCI mTRP PDSCH QCL assumption in accordance with certain aspects of the present disclosure.

[0020] Fig. 9 is an example single DCI mTRP scenario in accordance with certain aspects of the present disclosure.

[0021] Fig. 10A is an example single DCI mTRP scenario with spatial division multiplexing (SDM) of TRP in accordance with certain aspects of the present disclosure.

[0022] Fig. 10B is an example single DCI mTRP scenario with frequency division multiplexing (FDM) of TRP according to certain aspects of the present disclosure.

[0023] Fig. 10C is an example single DCI mTRP scenario with time division multiplexing (TDM) of TRP in accordance with certain aspects of the present disclosure.

[0024] Fig.11 are example TCI code points that map to one or two TCI states in a single DCI mTRP scenario in accordance with certain aspects of the present disclosure.

[0025] Fig.12 is a flow diagram illustrating example operations for a UE to conduct wireless communications in accordance with certain aspects of the present disclosure.

[0026] Fig.13 Illustrated are example QCL assumptions for example combined single DCI and mDCI mTRP scenarios in accordance with certain aspects of the present disclosure.

[0027] Fig.14A -G illustrates an example scenario for processing or dropping a PDSCH based on multiple TCI states indicated by a DCI and multiple TCI states supported by a UE according to aspects of the present disclosure.

[0028] Fig.15 A communication device is illustrated that may include various components configured to perform operations of the techniques disclosed herein in accordance with aspects of the present disclosure.

[0029] 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 in other aspects without specific recitation. DETAILED DESCRIPTION

[0030] Various aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for quasi-co-location (QCL) assumptions, such as QCL assumptions for combined single DCI (downlink control information) and multi-DCI mTRP (multiple transmission reception point) scenarios.

[0031] In a single DCI mTRP, one DCI is sent to indicate multiple QCL assumptions for physical downlink shared channel (PDSCH) transmissions from multiple TRPs. In some cases, the DCI may schedule PDSCH repetitions in spatial layers, frequency, and / or time. A transmission configuration indicator (TCI) code point (e.g., of the DCI) may be mapped (e.g., by a media access control (MAC) control element (CE)) to multiple (e.g., two) TCI states.

[0032] In mDCI mTRP, multiple TRPs send DCI to indicate the QCL assumptions for PDSCH transmissions from the TRPs. A control resource set (CORESET) for DCI can be associated with different CORESET pool index values, and different CORESET pool index values ​​are associated with separate mappings of TCI code points to TCI states, with each TCI code point mapped to a single TCI state.

[0033] In a combined single DCI and mDCI mTRP scenario, the UE may be configured with different CORESET pool index values ​​and also with a mapping of TCI code points, where one or more TCI code points are mapped to multiple TCI states.

[0034] The following description provides an example of QCL assumptions for a combined single DCI and mDCI mTRP scenario in a communication system, and does not limit the scope, applicability, or examples set forth in the claims. Without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Various examples may appropriately omit, replace, or add various processes or components. For example, the described method may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, the features described with respect to some examples may be combined in some other examples. For example, any number of aspects set forth herein may 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 that is practiced using other structures, functions, or structures and functions in addition to or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" used herein means "used as an example, instance, or illustration". Any aspect described herein as "exemplary" is not necessarily to be interpreted as being preferred or advantageous over other aspects.

[0035] Typically, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. RAT may also be referred to as a radio technology, air interface, etc. Frequency may also be referred to as a 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.

[0036] The techniques described herein can be used for various wireless networks and radio technologies. Although various aspects may be described herein using terms typically associated with 3G, 4G, and / or new radio (e.g., 5G NR) wireless technologies, various aspects of the present disclosure may be applied to other communication systems based on generations.

[0037] NR access can support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or above), millimeter wave (mmW) targeting high carrier frequency (e.g., 24 GHz to 53 GHz or above), massive machine type communication MTC (mMTC) targeting non-backward compatible MTC technology, and / 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 subframe. NR supports beamforming, and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. MIMO configuration in DL can support up to 8 transmit antennas, with multi-layer DL transmission of up to 8 streams and up to 2 streams per UE. Multi-layer transmission of up to 2 streams per UE can be supported. Aggregation of multiple cells with up to 8 serving cells can be supported.

[0038] Figure 1 An example wireless communication network 100 is shown in which various aspects of the present disclosure may be performed. For example, the wireless communication network 100 may be a NR system (e.g., a 5G NR network). Figure 1 As shown, the wireless communication network 100 may communicate with a core network 132. The core network 132 may communicate with one or more base stations (BSs) 110 and / or user equipments (UEs) 120 in the wireless communication network 100 via one or more interfaces.

[0039] According to certain aspects, BS 110 and UE 120 may be configured for combined single DCI and mDCI mTRP. Figure 1 As shown, in accordance with aspects of the present disclosure, BS 110a includes a beam manager 112, which can be configured for combined single DCI and mDCI mTRP. In accordance with aspects of the present disclosure, UE 120a includes a beam manager 122, which can be configured to determine QCL assumptions for combined single DCI and mDCI mTRP scenarios.

[0040] like Figure 1As shown, the wireless communication network 100 may include multiple BSs 110a-z (each BS is also individually referred to herein as BS 110 or collectively referred to as BS 110) and other network entities. BS 110 may provide communication coverage for a specific geographic area (sometimes referred to as a "cell"), which may be fixed or may move depending on the location of the mobile BS 110. In some examples, BS 110 may be interconnected to each other and / or to 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 transport network. Figure 1 In the illustrated example, base stations 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more cells.

[0041] BS 110 communicates with UEs 120a-y (each also individually referred to herein as UE 120 or collectively referred to herein as UE 120) in the 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. The wireless communication network 100 may also include a relay station (e.g., relay station 110r), also referred to as a relay or the like, which receives transmissions of data and / or other information from an upstream station (e.g., BS 110a or UE 120r) and sends transmissions of data and / or other information to a downstream station (e.g., UE 120 or BS 110), or relays transmissions between UEs 120, to facilitate communication between devices.

[0042] The network controller 130 may communicate with a set of BSs 110 and provide coordination and control (e.g., via a backhaul) for these BSs 110. In some aspects, the network controller 130 may communicate with a core network 132 (e.g., a 5G core network (5GC)), which provides various network functions such as access and mobility management, session management, user plane functions, policy control functions, authentication server functions, unified data management, application functions, network exposure functions, network repository functions, network slice selection functions, etc.

[0043] Figure 2 Example components of BS 110a and UE 120a are shown (eg, Figure 1 A wireless communication network 100) may be used to implement various aspects of the present disclosure.

[0044] At BS 110a, transmit processor 220 may receive data from data source 212 and control information from 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. A medium access control (MAC)-control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes. The MAC-CE may 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 (PSSCH).

[0045] The processor 220 may process (e.g., encode and symbol map) data and 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), a PBCH demodulation reference signal (DMRS), and a channel state information reference signal (CSI-RS). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols (if applicable), and may provide an output symbol stream to a modulator (MOD) 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 up-convert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a-232t may be transmitted via antennas 234a-234t, respectively.

[0046] At UE 120a, antennas 252a-252r can receive downlink signals from BS 110a 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., for OFDM, etc.) to obtain received symbols. 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. Receive processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120a to data sink 260, and provide decoded control information to controller / processor 280.

[0047] On the uplink, at the UE 120a, 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 reference signals (e.g., a sounding reference signal (SRS)). If applicable, the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, further processed by a modulator in a transceiver 254a-254r (e.g., for SC-FDM, etc.), and transmitted to the BS 110a. At the BS 110a, the uplink signal from the UE 120a 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 120a. The receive processor 238 may provide the decoded data to a data sink 239 and may provide the decoded control information to the controller / processor 240 .

[0048] Memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.A scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0049] The antennas 252, processors 266, 258, 264 and / or controller / processor 280 of the UE 120a and / or the antennas 234, processors 220, 230, 238 and / or controller / processor 240 of the BS 110a may be used to perform the various techniques and methods described herein. Figure 2As shown, the controller / processor 240 of BS 110a has a beam manager 241 that can be configured for combined single DCI and mDCI mTRPs according to aspects described herein. Figure 2 As shown, the controller / processor 280 of the UE 120a has a beam manager 281 that can be configured for QCL assumptions for combined single DCI and mDCI mTRP scenarios according to aspects described herein. Although shown at the controller / processor, other components of the UE 120a and BS 110a can be used to perform the operations described herein.

[0050] NR can utilize orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP) on uplink and downlink. NR can support half-duplex operation using time division duplex (TDD). OFDM and single carrier frequency division multiplexing (SC-FDM) divide the system bandwidth into multiple orthogonal subcarriers, which are also commonly called tones, bins, etc. Each subcarrier can be modulated with data. Modulation symbols can be sent in the frequency domain using OFDM and in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers can depend on the system bandwidth. The minimum resource allocation called a resource block (RB) can be 12 consecutive subcarriers. The system bandwidth can also be divided into subbands. For example, a subband can cover multiple RBs. NR can support a basic subcarrier spacing (SCS) of 15KHz, and other SCSs (e.g., 30kHz, 60kHz, 120kHz, 240kHz, etc.) can be defined relative to the basic SCS.

[0051] Figure 3 300 is a diagram showing an example of a frame format for NR. The transmission timeline of each of the downlink and uplink may be divided into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be divided into 10 subframes, each subframe 1 ms, indexed from 0 to 9. Depending on the SCS, each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16 ... slots). Depending on the SCS, each slot may include a variable number of symbol periods (e.g., 7, 12, or 14 symbols). The symbol periods in each slot may be assigned an index. A microslot, which may be referred to as a subslot structure, refers to a transmission time interval having a duration less than one slot (e.g., 2, 3, or 4 symbols). Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission, and the link direction for each subframe may be dynamically switched. The link direction may be based on the slot format. Each slot may include DL / UL data and DL / UL control information.

[0052] In NR, synchronization signal blocks (SSBs) are transmitted. In certain aspects, SSBs may be transmitted in bursts, where each SSB in a burst corresponds to a different beam direction for UE-side beam management (e.g., including beam selection and / or beam refinement). SSBs include PSS, SSS, and dual-symbol PBCH. SSBs may be transmitted at fixed slot locations, such as Figure 3 Symbols 0-3 shown. 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 identity. 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. SSB can be organized into SS bursts to support beam scanning. Further 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. SSB can be sent up to 64 times, for example, for mmWave, with up to 64 different beam directions. Multiple transmissions of SSB are called SS burst sets. SSBs in an SS burst set can be sent in the same frequency region, while SSBs in different SS burst sets can be sent at different frequency regions.

[0053] Example QCL assumptions for single TRP PDSCH:

[0054] In some systems (e.g., Release 15 systems), a set of TCI states (e.g., up to 8 TCI states) may be activated for PDSCH. Figure 4 As shown, at 406, UE 402 receives DCI (where the last symbol of DCI is at t1) scheduling PDSCH (where the first symbol of PDSCH is at t2) from BS 404. The TCI field in the DCI may indicate the TCI state of the scheduled PDSCH.

[0055] Based on whether the duration between the scheduled PDSCH and DCI meets the threshold, the UE 402 can apply the indicated TCI state or the default QCL assumption. For example, the threshold can be the "timeDurationForQCL" min value. The UE 402 can report the threshold (e.g., 14 or 28 OFDM symbols) to the BS 404 as the UE capability.

[0056] like Figure 4As shown, if UE 402 determines at 408a that the time offset between the reception of the DCI and the corresponding PDSCH is equal to or greater than a threshold (e.g., timeDurationForQCL), UE 402 may apply the TCI state indicated in the DCI for the PDSCH at 410a. For example, at 412, UE 402 may determine a receive beam for receiving the PDSCH based on the indicated TCI state. This may be because the UE has sufficient time to decode the DCI and prepare a beam based on the TCI state indicated in the DCI before receiving the PDSCH.

[0057] If UE 402 determines at 408b that the time offset is less than a threshold (e.g., timeDurationForQCL), UE 402 applies a default QCL assumption (e.g., QCL type D) to PDSCH at 410b. For example, at 412, UE 402 may determine a receive beam for receiving PDSCH based on the default QCL.

[0058] The default QCL assumption for PDSCH may be the QCL / TCI state of the control resource set (CORESET) associated with the monitored search space having the lowest CORESET identifier (ID) in the most recent timeslot in which the UE monitors one or more CORESETs within the activated BWP of the serving cell.

[0059] In other words, if all TCI code points are mapped to a single TCI state and the offset between the reception of the DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, the UE can assume that the demodulation reference signal (DM-RS) port of the PDSCH of the serving cell is quasi-co-located (QCL) with the RS relative to the QCL parameters indicated by the PDCCH QCL for the CORESET, and the CORESET is associated with the monitored search space with the lowest controlResourceSetId in the most recent time slot, in which one or more CORESETs within the activated bandwidth part (BWP) of the serving cell are monitored by the UE.

[0060] At 414, UE 402 receives PDSCH from BS 404 using the determined receive beam (at t2).

[0061] Example mTRP:

[0062] In some systems, a transmission may be via multiple transmission configuration indicator (TCI) states. In some examples, a TCI state is associated with a beam pair, an antenna panel, an antenna port, an antenna port group, a quasi-co-located (QCL) relationship, and / or a transmission reception point (TRP). Thus, a multi-TCI state transmission may be associated with multiple beam pairs, multiple antenna panels, and / or multiple QCL relationships associated with one or more multiple TRPs. The TCI state indicates a QCL assumption that the UE may use for channel estimation.

[0063] In some examples, the TCI state can generally indicate to the UE an association between a downlink reference signal and a corresponding QCL type, which can allow the UE to determine a receive beam for receiving a transmission. A QCL type can be associated with a combination (e.g., a set) of QCL parameters. In some examples, QCL type A indicates that the port is QCL (quasi-co-located) with respect to Doppler shift, Doppler spread, average delay, and delay spread; QCL type B indicates that the port is QCL with respect to Doppler shift and Doppler spread; QCL type C indicates that the port is QCL with respect to average delay and Doppler shift; and QCL type D indicates that the port is QCL with respect to spatial Rx parameters. Different port groups can share different sets of QCL parameters.

[0064] In some examples, for a multi-TCI state scenario, the same TB / CB (e.g., the same information bits, but may be differently encoded bits) is sent from multiple TCI states, such as two or more TRPs in a multi-TRP scenario. The UE considers transmissions from two TCI states and jointly decodes these transmissions. In some examples, transmissions from the TCI states are simultaneous (e.g., in the same time slot, mini-time slot, and / or the same symbol), but span different RBs and / or different layers. The number of layers for each TCI state may be the same or different. In some examples, for mTRP transmissions of the same codeword (i.e., the same transport block / code block), the modulation order may be the same. For mTRP transmissions involving different codewords (e.g., two codewords from two TRPs), each codeword may be associated with rank, modulation, and resource allocation (e.g., referred to as mTRP transmissions based on multiple DCI). In some examples, transmissions from TCI states may be performed at different times (e.g., in two consecutive mini-time slots or time slots). In some examples, transmissions from TRPs may be a combination of the above transmissions.

[0065] Example QCL assumptions for mDCI mTRP PDSCH:

[0066] Figure 5 is a call flow diagram illustrating example signaling 500 for a multi-DCI (mDCI) mTRP PDSCH QCL assumption.

[0067] In some systems (e.g., Release 16 systems), PDSCH may be sent by multiple TRPs and scheduled by multiple DCIs. Figure 6 As shown, in the example mTRP scenario 600, a first DCI (e.g., DCI1) sent from a first TRP (e.g., TRP1) schedules a first PDSCH (e.g., PDSCH1) from the first TRP (e.g., TRP1), and a second DCI (e.g., DCI2) sent from a second TRP (e.g., TRP2) schedules a second PDSCH (e.g., PDSCH2) from the second TRP (e.g., TRP2).

[0068] The TRP difference on the UE side can be based on an index value associated with the DCI. For example, the UE can receive a configuration of the index value. The media access control (MAC) control element (CE) can activate a TCI state set (e.g., up to 8 TCI states) and map the activated TCI state set to the TCI code point of the DCI. Each code point is mapped to a single TCI state. For example, 8 TCI states can be mapped to 8 TCI code points. The MAC-CE can also indicate a control resource set (CORESET) pool index value (e.g., CORESETPoolIndex value) associated with the activated set and mapping of the TCI state. Each CORESET (e.g., up to 5 CORESETs) can be configured with a CORESETPoolIndex value, which can be 0 or 1. Therefore, the CORESETs can be divided into two groups (e.g., a group of CORESETs associated with a CORESETPoolIndex value of 0 and a group of CORESETs associated with a CORESETPoolIndex value of 1). Fig. 7A and Figure 7B Example mappings of TCI code points to TCI states for two CORESETPoolIndex values ​​(0 and 1) are shown respectively.

[0069] Therefore, the UE's interpretation of the TCI field of the DCI depends on the CORESETPoolIndex of the CORESET in which the DCI was detected. For example, when the UE detects DCI in a CORESET configured with a CORESETPoolIndex value, the UE interprets the indicated TCI state based on the mapping associated with the same CORESETPoolIndex value.

[0070] like Figure 5As shown, at 506, UE 502 receives a configuration (e.g., a PDCCH-config RRC parameter) with an index value (e.g., a CORESETPoolIndex value) from TRP 1 504 (or TRP 2 or both). At 508, UE 502 receives a DCI (at t1) scheduling a PDSCH (at t2) from BS 504. The DCI may indicate a TCI state for the scheduled PDSCH. The TCI state may be in accordance with one of the CORESETPoolIndex values ​​(e.g., Figure 5 In the example of 0), the UE receives the DCI from the CORESET associated with the DCI. Therefore, the UE knows the CORESET and CORESETPoolIndex value associated with the DCI. The CORESETPoolIndex value of the CORESET where the DCI is received can be used for different purposes, such as hybrid automatic repeat request (HARQ)-Ack codebook construction and transmission, PDSCH scrambling, etc.

[0071] Based on whether the duration between the scheduled PDSCH and DCI meets the threshold, the UE 502 can apply the indicated TCI state or the default QCL assumption. For example, the threshold can be a "timeDurationForQCL" threshold. The UE 502 can report the threshold (e.g., 14 or 28 OFDM symbols) to the BS 504 as the UE capability.

[0072] like Figure 5 As shown, if UE 502 determines at 510a that the time offset between the reception of DCI 1 and the corresponding PDSCH is equal to or greater than a threshold (e.g., timeDurationForQCL), UE 502 may apply the TCI state indicated in the DCI for the PDSCH at 512a. For example, at 514, UE 502 may determine a receive beam for receiving the PDSCH based on the indicated TCI state.

[0073] If the UE 502 determines at 510b that the time offset is less than a threshold (eg, timeDurafionForQCL), the UE 502 applies a default QCL assumption to the PDSCH at 512b. For example, at 514, the UE 502 may determine a receive beam for receiving the PDSCH based on the default QCL.

[0074] like Figure 5As shown, the UE may maintain two default QCL assumptions corresponding to the lowest CORESET ID within each CORESET group. The two default QCL assumptions may be a UE capability, which may be conditioned on another UE capability of receiving two beams simultaneously (e.g., in a frequency range (FR2), a millimeter wave (mmWave) frequency range). For example, a UE may support mDCI in FR2, but may not support two simultaneous beam reception and / or may not support two default QCL assumptions. Figure 5 In the example of , the default QCL assumption is the QCL assumption with the lowest CORESET-ID of the CORESET with index value 0.

[0075] In other words, if a UE is configured by a higher layer parameter PDCCH-config containing two different values ​​of CORESETPoolIndex in a ControlResourceSet, if the offset between the reception of the DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, the UE may assume that the DM-RS ports of the PDSCH associated with the value of CORESETPoolIndex of the serving cell are QCL with respect to the QCL parameters of the PDCCH QCL indication for the CORESET, the CORESET being associated with the monitored search space with the lowest CORESET-ID among the CORESETs, the CORESET being configured with the same CORESETPoolIndex value as the PDCCH scheduling the PDSCH in the most recent timeslot, in which one or more CORESETs associated with the same CORESETPoolIndex value as the PDCCH scheduling the PDSCH within the activated BWP of the serving cell are monitored by the UE.

[0076] At 516, UE 502 receives PDSCH from BS 504 using the determined receive beam (at t2).

[0077] Example QCL assumptions for single DCI mTRP PDSCH:

[0078] Figure 8 is a call flow diagram illustrating example signaling 800 for a single DCI mTRP PDSCH QCL assumption.

[0079] In some systems (e.g., Release 16 systems), PDSCH can be sent by multiple TRPs and scheduled by a single DCI. Fig. 9As shown, in an example single DCI mTRP scenario 900, a DCI sent from a first TRP (e.g., TRP A) (e.g., on a PDCCH) schedules a PDSCH from the first TRP (e.g., TRP A) and a second TRP (e.g., TRP B), where the PDSCH is a multi-state PDSCH. In some examples, different TRPs use spatial division multiplexing (SDM) to send PDSCH, such as Fig. 10A For example, different TRPs use different spatial layers and different TCI states for transmission in overlapping RBs / symbols. In some examples, different TRPs use frequency division multiplexing (FDM) to transmit PDSCH, such as Fig. 10B For example, different TRPs use different RBs and different TCI states for transmission. In some examples, different TRPs use time division multiplexing (TDM) to transmit PDSCH, such as Fig. 10C As shown. For example, different TRPs are sent using different OFDM symbols (e.g., in different mini-slots or time slots) and different TCI states. Different repetitions can be sent within a time slot and / or different repetitions can be sent in different time slots.

[0080] Each TCI code point in the DCI (e.g., corresponding to a TCI field value in the DCI) may indicate one TCI state or two TCI states for the PDSCH. Therefore, the scheduled PDSCH may have two TCI states (e.g., corresponding to two TRPs). The MAC-CE may activate a TCI state set (e.g., up to 8 TCI states) and map the TCI states to the TCI code points of the DCI. Fig.11 is an example TCI code point that maps to one or two TCI states in a single DCI mTRP scenario. Then, when scheduling a PDSCH, the DCI indicates one of the TCI states. Figure 8 As shown, at 806, UE 802 receives DCI (at t1) scheduling PDSCH (at t2) from BS 804, and the DCI has code points indicating two TCI states.

[0081] Based on whether the duration between the scheduled PDSCH and DCI meets the threshold, the UE 802 can apply the indicated TCI state or the default QCL assumption. For example, the threshold can be a "timeDurationForQCL" threshold. The UE 802 can report the threshold (e.g., 14 or 28 OFDM symbols) to the BS 804 as the UE capability.

[0082] like Figure 8As shown, if UE 802 determines at 808a that the time offset between the reception of the DCI and the corresponding PDSCH is equal to or greater than a threshold (e.g., timeDurationForQCL), UE 802 may apply the TCI state indicated in the DCI to the PDSCH at 810a. For example, at 812, UE 802 may determine a receive beam for receiving the PDSCH based on the indicated TCI state.

[0083] If the UE 802 determines at 808b that the time offset is less than a threshold (eg, timeDurationForQCL), the UE 802 applies a default QCL assumption to the PDSCH at 810b. For example, at 814, the UE 802 may determine a receive beam for receiving the PDSCH based on the default QCL.

[0084] The UE may maintain two default QCL assumptions. The two default QCL assumptions may be a UE capability that may be conditioned on another UE capability of receiving two beams simultaneously (e.g., in a frequency range (FR2), a millimeter wave (mmWave) frequency range). For example, a UE may support mDCI in FR2, but may not support two simultaneous beam reception and / or may not support two default QCL assumptions. The default QCL assumption may correspond to the TCI state of the lowest DCI code point among the DCI code points indicating two TCI states.

[0085] In other words, if the offset between the reception of the DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, and at least one configured TCI state of the serving cell of the scheduled PDSCH contains "QCL type D", and at least one TCI code point indicates two TCI states, the UE can assume that the DM-RS port of the PDSCH of the serving cell is QCL with respect to the RS with respect to the QCL parameters associated with the TCI state corresponding to the lowest code point among the TCI code points containing two different TCI states.

[0086] At 814, UE 802 receives PDSCH from BS 804 using the determined receive beam (at t2).

[0087] Example combined single-DCI and mDCI mTRP:

[0088] In some systems, the UE may be configured for both single-DCI mTRP operation and mDCI mTRP operation. For example, the UE may be configured with different CORESET pool index values, and the UE may also receive a MAC-CE that maps one or more TCI code points to multiple TCI states.

[0089] Therefore, techniques and apparatus are needed for combined single DCI and mDCI mTRP scenarios.

[0090] Example QCL assumptions for combined single-DCI and mDCImTRP scenarios

[0091] Various aspects of the present disclosure provide techniques for quasi-co-location (QCL) assumptions, such as QCL assumptions for combined single DCI (downlink control information) and multiple DCI (mDCI) mTRP (multiple transmission reception point) scenarios. For example, various aspects provide techniques for a user equipment (UE) to determine which set of transmission configuration indicator (TCI) states to activate, which media access control (MAC) control element (CE) to follow, how to handle when the total number of TCI states across two physical downlink shared channels (PDSCHs) is greater than the number of TCI states supported by the UE, and how to determine a default QCL assumption.

[0092] Fig.12 1 is a flow chart illustrating example operations 1200 for wireless communication in accordance with certain aspects of the present disclosure. Operations 1200 may be performed, for example, by a UE (e.g., UE 120a in wireless communication network 100). Operations 1200 may be implemented as a processor (e.g., Figure 2 In addition, in operation 1200, the communication may be performed, for example, via one or more antennas (e.g., Figure 2 The UE may transmit and receive signals through an antenna 252. In some aspects, the UE may transmit and / or receive signals through a bus interface of one or more processors (eg, controller / processor 280) that obtain and / or output signals.

[0093] Operations 1200 may begin at 1202 by receiving signaling to configure a UE with a first index value (eg, a first CORESETPoolIndex value) associated with a first plurality of control resource sets (CORESETs) and a second index value (eg, a second CORESETPoolIndex value) associated with a second plurality of CORESETs.

[0094] At 1204, the UE may receive at least one MAC-CE that activates a TCI state set, indicates one of a first index value or a second index value, and maps at least one TCI code point in the DCI to two TCI states.

[0095] At 1206, the UE may determine one or more TCI states for receiving one or more transmissions based at least in part on the mapping.

[0096] According to certain aspects, when a UE is configured with two different CORESET pool index values ​​in different CORESETs in a serving cell, and the UE receives a MAC-CE that activates a TCI state set and maps at least one TCI code point to two TCI states, the UE assumes that the MAC-CE corresponds to the two CORESET pool index values. In this case, the UE interprets the TCI code point in the DCI based on the MAC-CE, whether the DCI is received in a CORESET configured with either CORESET pool index value. This can enable mDCI operation, where each DCI can schedule a PDSCH with one or two TCI states (e.g., a combined mDCI + single DCI mTRP scenario).

[0097] exist Fig.13 In the illustrative example shown, the UE may receive a Fig.11 The example mapping MAC-CE is shown. Fig.13 As shown, the UE may receive a DCI indicating TCI code point 1 in a CORESET associated with CORESETPoolIndex 0, which the UE interprets according to the MAC-CE as indicating TCI state 1 ID 3 and TCI state ID 4. The UE also receives another DCI indicating TCI code point 2 in a CORESET associated with CORESETPoolIndeX 1, which the UE interprets according to the same MAC-CE as indicating TCI state ID 2 and TCI state ID 6. When the scheduling offset between the DCI and the PDSCH satisfies (e.g., is equal to or higher than) the threshold duration, the UE receives the PDSCH using the TCI state indicated in the DCI.

[0098] According to certain aspects, if the UE receives another MAC-CE (e.g., a second MAC-CE) indicating a CORESETPoolIndex value, the UE may update the activated TCI state set and the mapping to the TCI code points only for the CORESETPoolIndex value indicated in the second MAC-CE. For another CORESETPoolIndex value, the UE may continue to use the first MAC-CE. Alternatively, for another CORESETPoolIndex value, the UE may assume that the previous (e.g., original) activated TCI state set and the mapping to the TCI code points (indicated by the first MAC-CE) are deactivated. The UE may receive another MAC-CE (e.g., a third MAC-CE) indicating another CORESETPoolIndex value, and then the UE may update the activated TCI state set and map to the TCI code points for the other CORESETPoolIndex value (indicated in the third MAC-CE).

[0099] According to certain aspects, when a UE is configured with two different CORESET pool index values ​​in different CORESETs in a serving cell, when the UE receives a MAC-CE that activates a TCI state set and maps at least one TCI code point to two TCI states, the UE may discard one or more PDSCH transmissions that overlap in time. For example, when the number of TCI states indicated for the PDSCH in the overlapping codeword exceeds a threshold, the UE discards one or more PDSCHs. In some examples, the threshold number of TCI states is a fixed value (e.g., a total of no more than 2 TCI states should be used). In some examples, the threshold number of TCIs may be based on UE capabilities (e.g., as indicated / determined from UE capability signaling).

[0100] The UE may determine one or more PDSCHs to be discarded based on a priority. In some examples, the priority is based on an index value associated with the CORESET that received the DCI that scheduled the PDSCH (e.g., based on a CORESETPoolIndex value). In some examples, the priority is based on one or more TCI states indicated by the DCI that scheduled the PDSCH. In some examples, the priority is based on the priority level of the traffic data scheduled for transmission in the PDSCH. For example, ultra-reliable low latency communication (URLLC) traffic may have a higher priority than enhanced mobile broadband (eMBB) traffic.

[0101] According to certain aspects, the UE may report hybrid automatic repeat request (HARQ) feedback for the discarded PDSCH. In some cases, the PDSCH may be rescheduled. When the PDSCH repetitions overlap, the UE may only discard the overlapping PDSCH. The UE may attempt to decode other PDSCH repetitions. If all PDSCH repetitions are discarded, the UE may send a negative acknowledgement (NACK).

[0102] Fig.14A FIG. 1-G illustrates an example scenario for processing or dropping a PDSCH based on the number of TCI states indicated by the DCI and the number of TCI states supported by the UE according to aspects of the present disclosure. Fig.14A -G shows the example, the threshold number of TCI status is 2. As shown in the figure, Fig.14A , 14B All PDSCHs in 14C and 14C can be processed as in any overlapping symbol, indicating no more than two TCI states. Figure 14D-14G As shown, when more than two TCI states are indicated, one or more PDSCHs are dropped.

[0103] According to certain aspects, when a UE is configured with two different CORESET pool index values ​​in different CORESETs in a serving cell and the UE receives a MAC-CE that activates a TCI state set and maps at least one TCI code point to two TCI states, the UE may determine a default QCL assumption for the PDSCH when the scheduling offset between the DCI and the scheduled PDSCH transmission is below a threshold duration.

[0104] In some examples, the UE maintains two default QCL hypotheses corresponding to the lowest CORESET IDs among the CORESETs monitored in the most recent timeslot with the same CORESETPoolIndex value.

[0105] In some examples, the UE determines two default QCL hypotheses based on two TCI states corresponding to the lowest code point of the TCI code points containing two different TCI states. If the TCI code points of the DCI in the CORESET with CORESETPoolIndex=0 are different from the TCI code points of the DCI in the CORESET with CORESETPoolIndex=1 (for example, if the second MAC-CE indicates a CORESETPoolIndex value), the TCI code points corresponding to one of the index values ​​(for example, CORESETPoolIndex=0) can be listed first, followed by the TCI code points corresponding to the other index value (for example, CORESETPoolIndex=1) to determine the lowest code point of the TCI code points containing two different TCI states.

[0106] In some cases, the UE may indicate a capability for more than two default QCL assumptions. In this case, the QCL assumption may be determined separately for each CORESETPoolIndex value. If no TCI codepoint of the DCI in a CORESET with a CORESETPoolIndex value indicates two TCI states, one of the default QCL assumptions may be determined from the QCL assumption corresponding to the lowest CORESET ID in the CORESET with the CORESETPoolIndex value monitored in the most recent timeslot. If at least one TCI codepoint of the DCI in a CORESET with a CORESETPoolIndex value indicates two TCI states, two default QCL assumptions may be determined based on the TCI state corresponding to the lowest codepoint among the TCI codepoints (associated with that CORESETPoolIndex value) containing two different TCI states. Based on the TCI code point associated with each CORESETPoolIndex value, one default QCL assumption can be determined for the first index value (e.g., CORESETPoolIndex=0), and two default QCL assumptions can be determined for another index value (e.g., CORESETPoolIndex=1), i.e., in this example, a total of three default QCL assumptions can be determined.

[0107] Fig.15 A communication device 1500 is shown, which may include devices configured to perform operations of the techniques disclosed herein (such as Fig.12 1500). The communication device 1500 includes a processing system 1502 coupled to a transceiver 1508 (e.g., a transmitter and / or a receiver). The transceiver 1508 is configured to transmit and receive signals, such as the various signals described herein, for the communication device 1500 via an antenna 1510. The processing system 1502 may be configured to perform processing functions for the communication device 1500, including processing signals received and / or transmitted by the communication device 1500.

[0108] The processing system 1502 includes a processor 1504 coupled to a computer readable medium / memory 1512 via a bus 1506. In some aspects, the computer readable medium / memory 1512 is configured to store instructions (e.g., computer executable code) that, when executed by the processor 1504, cause the processor 1504 to perform Fig.12, or other operations for performing the various techniques discussed herein for combined single DCI and mDCI mTRP operations. In certain aspects, according to aspects of the present disclosure, the computer-readable medium / memory 1512 stores code 1514 for receiving signaling to configure the UE with a first index value associated with a first plurality of CORESETs and a second index value associated with a second plurality of CORESETs; code 1516 for receiving at least one MAC-CE that activates a TCI state set, indicates one of the first index value or the second index value, and maps at least one TCI code point in the DCI to two TCI states, and / or code 1518 for determining one or more TCI states to be used for receiving one or more transmissions based at least in part on the mapping. In certain aspects, the processor 1504 has circuitry configured to implement the code stored in the computer-readable medium / memory 1512. According to various aspects of the present disclosure, processor 1504 includes: circuit 1520 for receiving signaling to configure the UE with a first index value associated with a first plurality of CORESETs and a second index value associated with a second plurality of CORESETs; circuit 1522 for receiving at least one MAC-CE, which activates a TCI state set, indicates one of the first index value or the second index value, and maps at least one TCI code point in the DCI to two TCI states, and / or circuit 1524 for determining one or more TCI states to be used for receiving one or more transmissions based at least in part on the mapping.

[0109] 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 (SC-FDMA), 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 (WiFi), 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.

[0110] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) and / 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 transmission reception point (TRP) can be used interchangeably. BSs can provide communication coverage for macro cells, pico cells, femto cells and / or other types of cells. Macro cells can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access to UEs with service subscriptions. Pico cells can cover relatively small geographic areas and can allow unrestricted access to UEs with service subscriptions. Femto cells can cover relatively small geographic areas (e.g., homes) and can allow UEs associated with the femto cells (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.) to have restricted access. A BS for a macro cell can be referred to as a macro BS. A BS for a pico cell can be referred to as a pico BS. A BS for a femto cell can be referred to as a femto BS or a home BS.

[0111] 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. that 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 may be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0112] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., BS) allocates resources for communications between some or all devices and equipment within its service area or cell. A 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 serve as a scheduling entity. In some examples, a 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, a UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In a mesh network example, in addition to communicating with a scheduling entity, UEs may also communicate directly with each other.

[0113] The method disclosed herein includes one or more steps or actions for implementing the method. Without departing from the scope of the claims, the method steps and / or actions can be interchangeable with each other. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions can be modified without departing from the scope of the claims.

[0114] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. As an example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiples of the same elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc or any other order of a, b, and c).

[0115] As used herein, the term "determining" encompasses 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), ascertaining, 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 resolving, selecting, choosing, establishing, etc.

[0116] The preceding description is provided to enable those skilled in the art to practice the various aspects described herein. It will be readily apparent to those skilled in the art that various modifications to these aspects are to be made, and the general principles defined herein may be applicable to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but to conform to the full scope consistent with the language of the claims, wherein, unless otherwise stated, references to elements in the singular form are not intended to represent "one and only one", but rather "one or more". Unless otherwise specified, the term "some" refers to one or more. All structural and functional equivalents of elements throughout the various aspects described in this disclosure that are known or will be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be included in the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly stated in the claims. Unless an element is explicitly recorded using the phrase "parts for...", or in the case of a method claim, an element is recorded using the phrase "steps for...", otherwise the claim element should not be interpreted according to the provisions of 35 U.S.C. §112 (f).

[0117] The various operations of the above method can be performed by any suitable component capable of performing the corresponding function. The component may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors. Generally, where there are operations shown in the accompanying drawings, those operations may have corresponding paired components plus functional components with similar numbers.

[0118] The various exemplary logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration.

[0119] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus may include any number of interconnecting buses and bridges. The bus may link together various circuits including a processor, a machine-readable medium, and a bus interface. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the case of a user terminal (see Figure 1 ), a user interface (e.g., keyboard, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and will not be described further. The processor may be implemented with one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how to best implement the described functions of the processing system depending on the specific application and the overall design constraints imposed on the entire system.

[0120] If implemented in software, these functions can be stored or transmitted as one or more instructions or codes on a computer-readable medium. Software should be broadly interpreted as instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or other. Computer-readable media include computer storage media and communication media, which include any media that facilitates the transfer of computer programs from one place to another. The processor can be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage medium. The computer-readable storage medium can be coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative solution, the storage medium can be integrated into the processor. For example, the machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium with instructions stored thereon separated from the wireless node, all of which can be accessed by the processor through a bus interface. Alternatively or additionally, the machine-readable medium or any part thereof can be integrated into the processor, such as in the case of a cache and / or a general register file. For example, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be embodied in a computer program product.

[0121] A software module may include a single instruction or multiple instructions, and may be distributed over several different code segments, distributed in different programs, and across multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a transmission module and a reception module. Each software module may reside in a single storage device, or may be distributed across multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard disk into a RAM. During the execution of a software module, a processor may load some instructions into a cache to increase access speed. Then, one or more cache lines may be loaded into a general register file for execution by the processor. When the functions of a software module are mentioned below, it will be understood that such functions are implemented by the processor when executing instructions from the software module.

[0122] Likewise, any connection is properly referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared (IR), radio, and microwaves are used to transmit software from a website, server, or other remote source, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of medium. As used herein, disks and optical disks include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray disks, where disks typically reproduce data magnetically, while optical disks reproduce data optically with lasers. Therefore, in some aspects, computer-readable media may include non-temporary computer-readable media (e.g., tangible media). In addition, for other aspects, computer-readable media may include temporary computer-readable media (e.g., signals). The above combinations should also be included within the scope of computer-readable media.

[0123] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, for performing the operations described herein and Fig.12 Instructions for the operations shown.

[0124] In addition, it should be understood that the modules and / or other appropriate components for performing the methods and techniques described herein can be downloaded and / or otherwise obtained (if applicable) by a user terminal and / or a base station. For example, such a device can be coupled to a server to facilitate the transfer of components for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage component (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk), so that the user terminal and / or the base station can obtain the various methods when the storage component is coupled or provided to the device. In addition, any other suitable technology for providing the methods and techniques described herein to the device can be utilized.

[0125] It is to be understood that the claims are not limited to the precise configuration and components described above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a user equipment UE, comprising: receiving signaling to configure the UE with a first index value associated with a first plurality of control resource sets CORESETs and a second index value associated with a second plurality of CORESETs; receiving at least one media access control MAC control element CE, wherein the at least one media access control MAC control element CE activates a transmission configuration indicator TCI state set, indicates one of the first index value or the second index value, and maps at least one TCI code point in downlink control information DCI to two TCI states; determining, based at least in part on the mapping, one or more TCI states to be used for receiving one or more transmissions; Receiving a first DCI in one of the first plurality of CORESETs associated with the first index value and indicating a first TCI state, wherein the first DCI schedules a first physical downlink shared channel (PDSCH) transmission; receiving a second DCI in one of the second plurality of CORESETs associated with the second index value and indicating a second TCI state, wherein the second DCI schedules a second PDSCH transmission that overlaps in time with the first PDSCH transmission; and The first PDSCH and the second PDSCH are processed or dropped based on the number of TCI states indicated by the first DCI and the second DCI.

2. The method according to claim 1, further comprising: A MAC-CE mapping is applied to a TCI code point in a DCI associated with the first index associated with the first plurality of CORESETs and the second index value associated with the second plurality of CORESETs.

3. The method according to claim 2, further comprising: receiving a DCI in the first plurality of CORESETs or the second plurality of CORESETs, the DCI indicating a TCI code point and scheduling a physical downlink shared channel (PDSCH) transmission; as well as One or more TCI states for receiving the PDSCH transmission are determined based on the MAC-CE mapping.

4. The method according to any one of claims 2 and 3, wherein: Determining the one or more TCI states for receiving the PDSCH transmission based on the MAC-CE mapping includes: when the duration between the DCI and the scheduled PDSCH transmission is equal to or greater than a threshold duration, determining the one or more TCI states indicated by the TCI code point in the DCI based on the MAC-CE mapping.

5. The method according to any one of claims 2 to 3, further comprising: receiving another MAC-CE, the another MAC-CE indicating one of the first index value or the second index value, and activating another TCI state set and mapping to a TCI code point in the DCI; Update the activated TCI state set and the mapping to TCI code points only for the CORESET associated with the indicated index value; as well as For a CORESET associated with another index value, the original set of activated TCI states and mapping to TCI codepoints is maintained.

6. The method according to any one of claims 2 to 3, further comprising: receiving another MAC-CE, the another MAC-CE indicating one of the first index value or the second index value, and activating another TCI state set and mapping to a TCI code point in the DCI; Update the activated TCI state set and the mapping to TCI code points only for the CORESET associated with the indicated index value; as well as For a CORESET associated with another index value, the original activated TCI state set and mapping to TCI code points are deactivated.

7. The method according to claim 1, wherein: Processing or discarding the first PDSCH and the second PDSCH based on the number of TCI states indicated by the first DCI and the second DCI includes: discarding one or more of the PDSCHs when the number of TCI states indicated in at least one codeword where the first PDSCH and the second PDSCH overlap is equal to or higher than a threshold number of TCI states.

8. The method according to claim 7, wherein: The threshold number of TCI states includes a fixed value.

9. The method according to claim 7, wherein: The threshold number of TCI states is based on the capabilities of the UE.

10. The method according to any one of claims 7 to 9, wherein: When the number of TCI states indicated in at least one symbol where the first PDSCH and the second PDSCH overlap is equal to or higher than a threshold number of TCI states, discarding one or more of the PDSCHs comprises: The first PDSCH or the second PDSCH is dropped based on a priority.

11. The method according to claim 10, wherein: The priority is based on an index value associated with the CORESET in which the DCI scheduling the PDSCH is received.

12. The method according to claim 10, wherein: The priority is based on one or more TCI states indicated by the DCI scheduling the PDSCH.

13. The method according to claim 10, wherein: The priority is based on a priority level of traffic data scheduled for transmission in the PDSCH.

14. The method according to any one of claims 1 to 3, further comprising: Report hybrid automatic repeat request HARQ feedback for the dropped PDSCH.

15. The method according to any one of claims 1 to 3, wherein: When the discarded PDSCH is rescheduled, the discarding includes: Only one or more PDSCH repetitions that overlap with other PDSCHs are discarded; Attempt to decode other PDSCH repetitions; and If all PDSCH repetitions are dropped, a negative acknowledgement is sent.

16. The method according to any one of claims 1 to 3, wherein: Processing or discarding the first PDSCH and the second PDSCH based on the number of TCI states indicated by the first DCI and the second DCI includes: when a first duration between the first DCI and the scheduled first PDSCH transmission is equal to or higher than a threshold duration, and a second duration between the second DCI and the scheduled second PDSCH transmission is equal to or higher than a threshold duration, processing or discarding the first PDSCH and the second PDSCH based on the number of TCI states indicated by the first DIC and the second DIC.

17. The method according to any one of claims 1 to 3, further comprising: Receiving DCI for scheduling physical downlink shared channel PDSCH transmission; as well as When a duration between the DCI and the scheduled PDSCH transmission is below a threshold duration, at least two default quasi-co-located QCL hypotheses for receiving the PDSCH transmission are determined.

18. The method according to claim 17, wherein: Determining the at least two default QCL hypotheses includes determining a QCL hypothesis corresponding to a lowest coreset identifier ID among the CORESETs associated with the same index value monitored in a recent time slot.

19. The method according to claim 17, wherein: Determining the at least two default QCL hypotheses includes determining a QCL hypothesis corresponding to a lowest TCI code point among TCI code points mapped to two TCI states.

20. The method according to claim 19, wherein: Determining the QCL hypothesis corresponding to the lowest TCI code point among the TCI code points mapped to the two TCI states includes determining the lowest TCI code point among the TCI code points mapped to the two TCI states based on a mapping associated with a MAC-CE indicating a lowest index value.

21. The method according to claim 17, wherein: Determining the at least two default QCL hypotheses includes separately determining a default QCL hypothesis for each index value when the UE supports a capability of more than two default QCL hypotheses.

22. An apparatus for wireless communication, comprising: at least one processor; as well as a memory coupled to the at least one processor, the memory comprising code executable by the at least one processor to cause the apparatus to: receiving signaling to configure the apparatus with a first index value associated with a first plurality of control resource sets CORESETs and a second index value associated with a second plurality of CORESETs; receiving at least one media access control MAC control element CE, wherein the at least one media access control MAC element CE activates a transmission configuration indicator TCI state set, indicates one of the first index value or the second index value, and maps at least one TCI code point in downlink control information DCI to two TCI states; determining, based at least in part on the mapping, one or more TCI states to be used for receiving one or more transmissions; Receiving a first DCI in one of the first plurality of CORESETs associated with the first index value and indicating a first TCI state, wherein the first DCI schedules a first physical downlink shared channel (PDSCH) transmission; receiving a second DCI in one of the second plurality of CORESETs associated with the second index value and indicating a second TCI state, wherein the second DCI schedules a second PDSCH transmission that overlaps in time with the first PDSCH transmission; and The first PDSCH and the second PDSCH are processed or dropped based on the number of TCI states indicated by the first DCI and the second DCI.

23. An apparatus for wireless communication, comprising: means for receiving signaling to configure the apparatus with a first index value associated with a first plurality of control resource sets CORESETs and a second index value associated with a second plurality of CORESETs; means for receiving at least one medium access control MAC control element CE, the at least one medium access control MAC element CE activating a transmission configuration indicator TCI state set, indicating one of the first index value or the second index value, and mapping at least one TCI code point in downlink control information DCI to two TCI states; means for determining, based at least in part on the mapping, one or more TCI states to be used for receiving one or more transmissions; means for receiving a first DCI in one of the first plurality of CORESETs associated with the first index value and indicating a first TCI state, wherein the first DCI schedules a first physical downlink shared channel (PDSCH) transmission; means for receiving a second DCI in one of the second plurality of CORESETs associated with the second index value and indicating a second TCI state, wherein the second DCI schedules a second PDSCH transmission that overlaps in time with the first PDSCH transmission; and means for processing or dropping the first PDSCH and the second PDSCH based on the number of TCI states indicated by the first DCI and the second DCI.

24. A computer readable medium having stored thereon computer executable code for wireless communication, comprising: code for receiving signaling for configuring a user equipment (UE) with a first index value associated with a first plurality of control resource sets (CORESETs) and a second index value associated with a second plurality of CORESETs; code for receiving at least one media access control MAC control element CE, wherein the at least one media access control MAC element CE activates a transmission configuration indicator TCI state set, indicates one of the first index value or the second index value, and maps at least one TCI code point in downlink control information DCI to two TCI states; code for determining one or more TCI states to be used for receiving one or more transmissions based at least in part on the mapping; code for receiving a first DCI in one of the first plurality of CORESETs associated with the first index value and indicating a first TCI state, wherein the first DCI schedules a first physical downlink shared channel (PDSCH) transmission; code for receiving a second DCI in one of the second plurality of CORESETs associated with the second index value and indicating a second TCI state, wherein the second DCI schedules a second PDSCH transmission that overlaps in time with the first PDSCH transmission; and Code for processing or dropping the first PDSCH and the second PDSCH based on the number of TCI states indicated by the first DCI and the second DCI.

25. A computer program product comprising computer instructions, which when executed by a processor implement a method for wireless communication of a user equipment (UE), the method comprising: receiving signaling to configure the UE with a first index value associated with a first plurality of control resource sets CORESETs and a second index value associated with a second plurality of CORESETs; receiving at least one media access control MAC control element CE, wherein the at least one media access control MAC control element CE activates a transmission configuration indicator TCI state set, indicates one of the first index value or the second index value, and maps at least one TCI code point in downlink control information DCI to two TCI states; determining, based at least in part on the mapping, one or more TCI states to be used for receiving one or more transmissions; Receiving a first DCI in one of the first plurality of CORESETs associated with the first index value and indicating a first TCI state, wherein the first DCI schedules a first physical downlink shared channel (PDSCH) transmission; receiving a second DCI in one of the second plurality of CORESETs associated with the second index value and indicating a second TCI state, wherein the second DCI schedules a second PDSCH transmission that overlaps in time with the first PDSCH transmission; and The first PDSCH and the second PDSCH are processed or dropped based on the number of TCI states indicated by the first DCI and the second DCI.

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