Beam management enhancements for multi-TRP scenarios

Abstract

Apparatuses (devices), methods, processing systems, and computer-readable media for beam management in multi-TRP scenarios are disclosed. One exemplary method generally includes receiving, from at least one base station (BS), a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses, wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; performing one or more CSI-RS measurements on the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration; and determining, for each of the one or more transmission hypotheses, a preferred receive beam for communicating with the at least one BS based at least in part on the one or more CSI-RS measurements.

Description

[0001] This application is a divisional application of an application with application date of May 28, 2020, application number 202080038370.8 (international application number PCT / CN2020 / 092862), and name “Beam Management Enhancement for Multi-TRP Scenarios”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application claims the benefit of and priority to PCT Patent Application No. PCT / CN2019 / 089535, filed on May 31, 2019, which is assigned to the assignee of this application and is hereby expressly incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0004] Aspects of the present disclosure relate to wireless communications and, more particularly, to techniques for beam management. Background Art

[0005] 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 Third 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 just a few.

[0006] In some examples, a wireless multiple access communication system may include several base stations (BS), each of which is capable of supporting communication of multiple communication devices (also referred to as user equipment (UE)) simultaneously. In an LTE or LTE-A network, a set of one or more base stations may define an evolved B node (eNB). In other examples (e.g., in a next generation, new radio (NR), or 5G network), a wireless multiple access communication system may include several distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmission reception points (TRPs), etc.) in communication with several central units (CUs) (e.g., central nodes (CNs), access node controllers (ANCs), etc.), wherein a set of one or more DUs in communication with a CU may define an access node (e.g., which may be referred to as a BS, a next generation B node (gNB or g B node), a TRP, etc.). A BS or DU may communicate with a set of UEs on a downlink channel (e.g., for transmission from a BS or DU to a UE) and an uplink channel (e.g., for transmission from a UE to a BS or DU).

[0007] 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 an enhancement set of the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectrum 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.

[0008] 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

[0009] 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 in the appended claims, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled "Detailed Description," it will be understood how the features of the present disclosure provide advantages including improved communication between access points and stations in a wireless network.

[0010] Certain aspects provide a method for wireless communication by a user equipment (UE). The method generally includes receiving a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses from at least one base station (BS), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; performing one or more CSI-RS measurements for the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration; determining a preferred receive beam for communicating with the at least one BS for each of the one or more transmission hypotheses based at least in part on the one or more CSI-RS measurements; determining at least one of the one or more transmission hypotheses based at least in part on control signaling received from the at least one BS, wherein the control signaling includes at least one of a quasi co-located (QCL) information indication or a DMRS port group indication for DL ​​transmission; and determining spatial reception parameters for DL ​​reception based at least in part on a determined preferred receive beam associated with at least one of the one or more transmission hypotheses.

[0011] Certain aspects provide an apparatus for wireless communication by a user equipment (UE). The apparatus generally includes at least one processor configured to: receive a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses from at least one base station (BS), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; perform one or more CSI-RS measurements for the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration; determine a preferred receive beam for communication with the at least one BS for each of the one or more transmission hypotheses based at least in part on the one or more CSI-RS measurements; determine at least one of the one or more transmission hypotheses based at least in part on control signaling received from the at least one BS, wherein the control signaling includes at least one of a quasi co-located (QCL) information indication or a DMRS port group indication for DL ​​transmission; and determine a spatial reception parameter for DL ​​reception based at least in part on a determined preferred receive beam associated with at least one of the one or more transmission hypotheses. The apparatus generally also includes a memory coupled to the at least one processor.

[0012] Certain aspects provide an apparatus for wireless communication by a user equipment (UE). The apparatus generally includes means for receiving a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses from at least one base station (BS), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; means for performing one or more CSI-RS measurements for the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration; means for determining a preferred receive beam for communicating with the at least one BS for each of the one or more transmission hypotheses based at least in part on the one or more CSI-RS measurements; means for determining at least one of the one or more transmission hypotheses based at least in part on control signaling received from the at least one BS, wherein the control signaling includes at least one of a quasi co-located (QCL) information indication or a DMRS port group indication for DL ​​transmission; and means for determining spatial reception parameters for DL ​​reception based at least in part on a determined preferred receive beam associated with at least one of the one or more transmission hypotheses.

[0013] Certain aspects provide a non-transitory computer-readable medium for wireless communications by a user equipment (UE). The non-transitory computer-readable medium generally includes instructions that, when executed by at least one processor, cause the at least one processor to: receive a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses from at least one base station (BS), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; perform one or more CSI-RS measurements on the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration; determine a preferred receive beam for communicating with the at least one BS for each of the one or more transmission hypotheses based at least in part on the one or more CSI-RS measurements; determine at least one of the one or more transmission hypotheses based at least in part on control signaling received from the at least one BS, wherein the control signaling includes at least one of a quasi-co-located (QCL) information indication or a DMRS port group indication for DL ​​transmission; and determine spatial reception parameters for DL ​​reception based at least in part on a determined preferred receive beam associated with at least one of the one or more transmission hypotheses.

[0014] Certain aspects provide a method for wireless communication by a base station (BS). The method generally includes transmitting a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses to a user equipment (UE), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; transmitting control signaling indicating at least one of the one or more transmission hypotheses to the UE, wherein the control signaling includes at least one of a quasi-co-located (QCL) information indication associated with a spatial reception parameter for DL ​​reception or a DMRS port group indication for DL ​​transmission; transmitting one or more CSI-RS according to the CSI-RS resource configuration; and receiving an indication of a preferred receive beam for one or more of the transmission hypotheses from the UE.

[0015] Certain aspects provide an apparatus for wireless communication by a base station (BS). The apparatus generally includes at least one processor configured to: transmit a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses to a user equipment (UE), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; transmit control signaling indicating at least one of the one or more transmission hypotheses to the UE, wherein the control signaling includes at least one of a quasi-co-located (QCL) information indication associated with a spatial reception parameter for DL ​​reception or a DMRS port group indication for DL ​​transmission; transmit one or more CSI-RSs according to the CSI-RS resource configuration; and receive an indication of a preferred receive beam for one or more of the transmission hypotheses from the UE. The apparatus generally also includes a memory coupled to the at least one processor.

[0016] Certain aspects provide an apparatus for wireless communication by a base station (BS). The apparatus generally includes a device for transmitting a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses to a user equipment (UE), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; a device for transmitting control signaling indicating at least one of the one or more transmission hypotheses to the UE, wherein the control signaling includes at least one of a quasi-co-located (QCL) information indication associated with a spatial reception parameter for DL ​​reception or a DMRS port group indication for DL ​​transmission; a device for transmitting one or more CSI-RSs according to the CSI-RS resource configuration; and a device for receiving from the UE an indication of a preferred receive beam for one or more of the transmission hypotheses.

[0017] Certain aspects provide a non-transitory computer-readable medium for wireless communication by a user equipment (UE). The non-transitory computer-readable medium generally includes instructions that, when executed by at least one processor, cause the at least one processor to: transmit a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses to a user equipment (UE), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; transmit control signaling indicating at least one of the one or more transmission hypotheses to the UE, wherein the control signaling includes at least one of a quasi-co-located (QCL) information indication associated with a spatial reception parameter for DL ​​reception or a DMRS port group indication for DL ​​transmission; transmit one or more CSI-RSs according to the CSI-RS resource configuration; and receive from the UE an indication of a preferred receive beam for one or more of the transmission hypotheses.

[0018] Aspects of the present disclosure provide apparatuses, devices, processors, and computer-readable media for performing the methods described herein.

[0019] Aspects of the present disclosure provide apparatuses, devices, processors, and computer-readable media for performing techniques and methods that may be complementary to operations performed by a UE (eg, a BS) described herein.

[0020] 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 several of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to understand in detail the manner in which the above-stated features of the present disclosure are used, a more particular description of the content briefly summarized above may be made with 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 not to be considered limiting of its scope, as the description may admit to other equally effective aspects.

[0022] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0023] Figure 2 is a block diagram illustrating an example architecture of a distributed radio access network (RAN) in accordance with certain aspects of the present disclosure.

[0024] Figure 3 An example transmission configuration indication (TCI) state configuration is illustrated.

[0025] Figure 4 An example wireless communication system is illustrated in which beam management is performed.

[0026] Figure 5 An example multi-TRP wireless communication system according to certain aspects of the present disclosure is illustrated.

[0027] Figure 6 Different transmission assumptions in a multi-TRP wireless communication system according to certain aspects of the present disclosure are explained.

[0028] Figure 7 is a flow diagram illustrating example operations for wireless communications in accordance with certain aspects of the present disclosure.

[0029] Figure 8 is a flow diagram illustrating example operations for wireless communications in accordance with certain aspects of the present disclosure.

[0030] Fig. 9 Illustrated are communications devices that may include various components configured to perform operations for the techniques disclosed herein.

[0031] Fig.10 Illustrated are communications devices that may include various components configured to perform operations for the techniques disclosed herein.

[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 in other aspects without specific recitation. DETAILED DESCRIPTION

[0033] Aspects of the present disclosure provide apparatus (devices), methods, processing systems, and computer-readable media for beam management in multi-TRP scenarios. For example, in some cases, a user equipment may receive a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses from at least one base station (BS). The UE may perform one or more CSI-RS measurements on the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration. The UE may then determine a preferred receive beam for communicating with the at least one BS for each of the one or more transmission hypotheses based at least in part on the one or more CSI-RS measurements. Thereafter, the UE may use the preferred receive beam to communicate with the at least one BS.

[0034] The following description provides an example of beam management in a multi-TRP scenario in a communication system, without limiting the scope, applicability, or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements discussed without departing from the scope of the present disclosure. Various examples may appropriately omit, replace, or add various procedures or components. For example, the described method may be performed in an order different from the order described, and various steps may be added, omitted, or combined. Moreover, the features described with reference to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement an apparatus or practice method. In addition, the scope of the present disclosure is intended to cover such equipment or methods practiced using other structures, functionality, or structures and functionality as a supplement to or in addition to the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein may be implemented by one or more elements of the claims. The wording "exemplary" is used herein to mean "used as an example, instance, or illustration". Any aspect described herein as "exemplary" is not necessarily to be interpreted as superior to or superior to other aspects.

[0035] In general, 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, frequency channel, frequency tone, subband, etc. Each frequency may support a single RAT in a given geographic area in order 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 commonly associated with 3G, 4G, and / or new radio (e.g., 5G NR) wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations.

[0037] NR access can support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or more), millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or more), 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 can dynamically configure beam directions. 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 can be supported using up to 8 serving cells.

[0038] Figure 1 An example wireless communication network 100 is illustrated in which 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 be in communication with a core network 132. The core network 132 may be in communication 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] like Figure 1 As illustrated in , the wireless communication network 100 may include several BSs 110a-z (each 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 stationary or mobile 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 using any suitable transport network via various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.). Figure 1In the example shown in , BSs 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. A network controller 130 may be coupled to a set of BSs 110 and provide coordination and control (e.g., via a backhaul) for these BSs 110.

[0040] BS 110 communicates with UEs 120a-y (each also individually referred to herein as UE 120 or collectively referred to 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 stationary or mobile. The wireless communication network 100 may also include a relay station (e.g., relay station 110r) (also referred to as a relay, etc.) that 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 that relays transmissions between UEs 120 to facilitate communication between the devices.

[0041] According to certain aspects, BS 110 and UE 120 may be configured for beam management in a multi-TRP scenario as described herein. Figure 1 As shown in FIG. 1 , BS 110a includes a beam manager 112. According to aspects of the present disclosure, beam manager 112 may be configured to perform Figure 7 and other aspects of beam management in a multi-TRP scenario described herein. Figure 1 As shown in FIG. 1 , UE 120a includes a beam manager 122. According to aspects of the present disclosure, the beam manager 122 may be configured to perform Figure 8 and other aspects of beam management in multi-TRP scenarios described herein.

[0042] Figure 2 1 and 120a (eg, in a BS 110a and a UE 120a) that can be used to implement various aspects of the present disclosure are illustrated. Figure 1 Example components of the wireless communication network 100).

[0043] At BS 110a, a transmit processor 220 may receive data from a data source 212 and control information from a 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).

[0044] 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), 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 where applicable, and may provide an output symbol stream to a modulator (MOD) in a transceiver 232a-232t. Each modulator in the transceiver 232a-232t may process a respective 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. Downlink signals from modulators 232a-232t in the transceiver may be transmitted via antennas 234a-234t, respectively.

[0045] At UE 120a, antennas 252a-252r may receive downlink signals from BS 110a and may provide received signals to demodulators (DEMODs) 254a-254r in the transceiver, respectively. Each demodulator in transceivers 254a-254r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain received symbols from all demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. Receive processor 258 may 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.

[0046] On the uplink, at the UE 120a, the 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)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a-254r in the transceiver (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 sent by the UE 120a. Receive processor 238 may provide decoded data to data sink 239 and decoded control information to controller / processor 240 .

[0047] 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.

[0048] The antenna 252, processors 266, 258, 264 and / or controller / processor 280 of the UE 120a, and / or the antenna 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 includes a beam manager 241, which may be configured to perform Figure 7 and other aspects of beam management in a multi-TRP scenario described herein. Figure 2 As shown, the controller / processor 280 of the UE 120a includes a beam manager 281, which can be configured to perform Figure 8 The operations in and other aspects of beam management in multi-TRP scenarios described herein. Although shown as being at the controller / processor, other components of UE 120a and BS110a may also be used to perform the operations described herein.

[0049] 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 often called frequency modulation, frequency slot, etc. Each subcarrier can be modulated with data. Modulation code elements can be sent in the frequency domain under OFDM and in the time domain under 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 (so-called resource block (RB)) can be 12 consecutive subcarriers. The system bandwidth can also be divided into subbands. For example, one subband can cover multiple RBs. NR can support a base subcarrier spacing (SCS) of 15KHz, and other SCSs (e.g., 30kHz, 60kHz, 120kHz, 240kHz, etc.) can be defined relative to the base SCS.

[0050] Example Quasi-Co-location Signaling

[0051] Quasi co-located (QCL) signaling can be used for reference signals (RS) and channels across scenarios involving multiple cells, such as coordinated multi-point (CoMP) scenarios where multiple transmit reception points (TRPs) integrated access and backhaul (IAB) nodes each have their own cell identity (ID).

[0052] The QCL assumption generally refers to the following assumption: for a set of signals or channels that are considered to be QCL-related (or simply referred to as "QCL'd" for simplicity), certain characteristics derived (measured) for one of the signals or channels also apply to other signals or channels. As an example, if the PDSCH DMRS is QCLed with other DL RSs, the UE can process the PDSCH based on the measurement of the other DL RSs. In some cases, this can result in more efficient processing, allowing the UE to use (reuse) previous measurements of QCLed RSs, which can speed up processing of the current channel.

[0053] In some cases, the QCL assumptions for reception / transmission of signals and channels may be signaled via a mechanism called a transmission configuration indication (TCI) state (sometimes referred to as a transmission configuration indicator state). In some cases, a UE may be configured to have multiple TCI states via radio resource control (RRC) signaling, and one of the TCI states may be indicated by an N-bit (e.g., 3-bit) DCI field for PDSCH. A field in an RRC message (e.g., qcl-info) may list references to TCI states for providing QCL sources and QCL types for associated resources. TCI states may be indicated by an ID (e.g., TCI-StateId). An RRC message (e.g., a PDSCH-Config field) may include a field with a TCI state list indicating a transmission configuration, which includes a QCL relationship between a DL RS in an RS set and a PDSCH DMRS port. The TCI state associates a DL RS (e.g., one or two) with a corresponding QCL type. The DLBWP and cell where the RS is located may also be indicated.

[0054] Figure 3An example of how the RS associated with the TCI state can be configured via RRC signaling is explained. QCL assumptions can be grouped into different types, which correspond to parameters that a set of signals for QCL can be assumed to be QCL. For example, for a set of signals for QCL, type A can indicate Doppler shift, Doppler spread, average delay, and delay spread can be assumed to be QCL, while type B can indicate only Doppler shift and Doppler spread, and type C can indicate another different set of parameters, such as average delay and Doppler shift. In some cases, spatial QCL assumptions (e.g., spatial TX / RX parameters) can be indicated, for example, by type D. Spatial QCL may mean that a (Tx or Rx) beam selected based on a certain signal measurement can be applied to QCL-related signals. If at least spatial QCL is configured / indicated, an RRC field (e.g., tci-PresentInDCI field) can indicate whether a TCI field is present in the DL-related DCI, and when this field is not present, the UE considers that TCI is not present / disabled.

[0055] like Figure 3 As explained, the TCI state may indicate which RSs are QCL and the QCL type. The TCI state may also indicate a ServCellIndex (serving cell index), which is a short identifier for identifying a serving cell, such as a primary cell (PCell) or a secondary cell (Scell) in a carrier aggregation (CA) deployment. A value of 0 for this field may indicate a PCell, while a previously assigned ScellIndex (secondary cell index) may be applicable to an SCell.

[0056] In some examples, the UE may be configured with a list of up to M TCI states via higher layer parameters to decode the PDSCH based on a detected PDCCH with DCI intended for the UE and a given serving cell, where M depends on the UE capabilities. Each contains parameters for configuring a QCL relationship between one or two downlink RSs of the PDSCH and a DM-RS port. The QCL relationship is configured for the first and second DL RSs, respectively, by higher layer parameters. For the case of two DL RSs, the QCL types may not be the same, regardless of whether the same DL RS or different DL RSs are referenced. The QCL type corresponding to each DL RS is given by another higher layer parameter and may indicate QCL type A, QCL type B, QCL type C, or QCL type D.

[0057] The UE may receive an activation command (eg, in a MAC-CE) to map one or more of the TCI states (eg, up to 8 TCI states) configured by higher layers to code points of the TCI field in the DCI.

[0058] For the uplink, spatial relation parameters may be used. The spatial relation parameters may configure the spatial relation between the reference RS (e.g., SSB, CSI-RS, and / or SRS) and the uplink transmission (e.g., PUCCH, PUSCH, SRS). A spatial relation set may be configured via higher layer signaling (e.g., RRC). MAC-CE may be used to select a subset of spatial relations (e.g., a single spatial relation). Based on the spatial relation, the UE may decide the UE transmit beam to be used for uplink transmission.

[0059] Example Techniques for Beam Management for Multi-TRP Scenario

[0060] In wireless communications, beam management is important for performance at higher frequencies because the beams in such scenarios may be relatively thin in order to provide sufficient beamforming gain for wireless communications.

[0061] Figure 4 An example wireless communication system 400 is illustrated in which beam management may be performed in accordance with certain aspects of the present disclosure. In some cases, the wireless communication system 400 may be over a 5G NR network or any other suitable network.

[0062] As illustrated, beam management may generally be controlled by BS 110. For example, in a downlink (DL), BS 110 may transmit information to UE 120a (e.g., UE-1) using multiple TX beams (e.g., beam 402). Thereafter, UE 120a may report the index of the TX strongest beam to be used for signal (e.g., PDSCH) transmission based on the information transmitted using the multiple TX beams.

[0063] UE 120a may also determine one or more receive (Rx) beams (e.g., Rx beam 404) to be used to receive signals (e.g., PDSCH) from BS 110. In general, the UE may select one or more strongest Rx beams to receive signals from BS 110. Similarly, UE 120b (e.g., UE-2) may determine one or more transmit (Tx) beams (e.g., Tx beam 406) to be used to transmit signals (e.g., PUSCH) to BS 110, and the BS may select an Rx beam (e.g., Rx beam 408) to be used to receive signals (e.g., PUSCH) from UE 120b.

[0064] In certain aspects, the TX beam of BS110 may be used to deliver multiple synchronization signal blocks (SSBs) or channel state information-reference signals (CSI-RS) to UE 120a. In some cases, each TX beam may be associated with a different SSB and / or a different CSI-RS. In some cases, for uplink (UL) transmissions, UE 120b (e.g., UE-2) may be configured by BS110 to apply different Tx beams to different SRS resources to allow BS110 to select the strongest Tx beam for UL transmission (e.g., PUSCH). In other cases, UE 120b may be configured to transmit SRS with the same TX beam across multiple symbols to allow the BS to refine its Rx beam 408.

[0065] In some cases, BS 110 may transmit QCL information, such as type D QCL information (e.g., spatial Rx parameters) for PDSCH to UE 120b, as discussed above. The QCL information may include a CSI-RS resource ID or SSB-ID of the RS associated with the QCL information in some cases to allow the UE to determine an Rx beam for receiving the PDSCH based on a previously measured CSI-RS or SSB.

[0066] In some wireless communication networks (for example, Figure 1 In a 5G NR network illustrated in , a user equipment may communicate with the network via multiple transmit reception points (TRPs) (e.g., a first TRP and a second TRP) on one or more transmit beams associated with each TRP. In some cases, each TRP may be associated with a different downlink (DL) demodulation reference signal (DMRS) port group. For example, a first TRP may be associated with a first DL DMRS port group, and a second TRP may be associated with a second DL DMRS port group.

[0067] Figure 5 An example multi-TRP wireless communication system 500 is illustrated in accordance with certain aspects of the present disclosure. In some cases, the multi-TRP wireless communication system 500 may include a 5G NR network or any other suitable network. As illustrated, a UE 120a may communicate with a first TRP 502 (e.g., associated with a first DL DMRS port group) and a second TRP 504 (e.g., associated with a second DL DMRS port group), which may be Figure 1 An example of a base station 110 is illustrated in FIG.

[0068] In some cases, each of the first TRP 502 and the second TRP 504 may use the same time-frequency resources (e.g., PDSCH-1 and PDSCH-2) to transmit a physical downlink shared channel (PDSCH) to the UE 120a. To achieve this, in some cases, the signals from the TRP 502 and the TRP 504 may use at least one of the same or different redundancy versions (RVs) of the same layer 1 (L1) codeword, different L1 codewords, or different layers of the same L1 codeword.

[0069] In a multi-TRP scenario, there are different transmission assumptions that the UE can take into account when determining the receive (Rx) beam (as discussed above). For example, depending on the transmission assumption, the UE can use different Rx beams (or different Rx beam groups) to receive (all) PDSCHs from each of TRPs 502 and 504.

[0070] For example, Figure 6 , for the first transmission assumption 602, the UE 120a may receive a signal 613 from a first TRP 612 (e.g., TRP1) (e.g., associated with a first DLDMRS port group), while a signal from a second TRP 614 (e.g., TRP2) (e.g., associated with a second DLDMRS port group) is suppressed / silenced (e.g., not transmitted). In addition, for the second transmission assumption 604, the UE 120a may receive a signal 615 from the second TRP 614, while a signal from the first TRP 612 is suppressed / silenced. In addition, for the third transmission assumption 606, the UE 120a may receive a signal from the first TRP 612 while receiving interference 616 from a signal 615 from the second TRP 614 that is communicating with the second UE 120b. In addition, for the fourth transmission assumption 608, the UE 120a may receive a signal 613 from both the first TRP 612 and the second TRP 614 without interference. Furthermore, for the fifth transmission hypothesis 610, the UE 120a may receive a signal 615 from a second TRP 614 (associated with the second DL DMRS port group) while receiving interference 617 from a signal 613 from a first TRP 612 (associated with the first DL DMRS port group).

[0071] Currently, only a single CSI-RS resource ID may be indicated in the QCL information. Since one CSI-RS resource may be associated with only one TRP (e.g., because different TRPs may include different large-scale channel properties for the UE), a single CSI-RS resource ID may only allow the UE to determine the Rx beam(s) taking into account only one TRP. Therefore, in a multi-TRP scenario, Figure 6For all transmission assumptions shown (e.g., especially transmission assumptions 3-5), good Rx beam performance may not be supported because the UE only obtains a single CSI-RS resource ID associated with only one TRP in a multi-TRP scenario.

[0072] Therefore, various aspects of the present disclosure provide techniques for improving Rx beam determination in multi-TRP scenarios. For example, in some cases, improving Rx beam determination in multi-TRP scenarios may involve providing a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses to the UE. In these cases, the CSI-RS resource configuration may include CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group (e.g., associated with a first TRP) and a second DL DMRS port group (e.g., associated with a second TRP).

[0073] Figure 7 700 for wireless communication in accordance with certain aspects of the present disclosure. Operations 700 may be performed, for example, by a first wireless node such as a BS (for example, such as BS 110 in wireless communication network 100). Operations 700 may be implemented as a processor (e.g., Figure 2 In addition, signal transmission and reception by the BS in operation 700 may be performed by one or more antennas (e.g., Figure 2 In some aspects, the transmission and / or reception of signals by the BS may be implemented via a bus interface of one or more processors (eg, controller / processor 240) that obtain and / or output signals.

[0074] Operations 700 begin at block 702, where a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses is transmitted to a user equipment (UE), where the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group.

[0075] At 704, the BS transmits control signaling indicating at least one of the one or more transmission hypotheses to the UE, wherein the control signaling includes at least one of a quasi-co-located (QCL) information indication associated with spatial reception parameters for DL ​​reception or a DMRS port group indication for DL ​​transmission.

[0076] At 706, the BS transmits one or more CSI-RSs according to the CSI-RS resource configuration.

[0077] At 708, the BS receives from the UE an indication of a preferred receive beam for one or more of the transmission hypotheses.

[0078] Figure 8 is a flow diagram illustrating example operations 800 for wireless communications in accordance with certain aspects of the present disclosure. Operations 800 may be performed, for example, by a first wireless node, such as a UE (eg, such as UE 120 in wireless communication network 100).

[0079] Operation 800 may be an operation performed by the UE that is complementary to operation 700 performed by the BS. Operation 800 may be implemented as a processor (eg, Figure 2 In addition, signal transmission and reception by the UE in operation 800 may be performed by one or more antennas (e.g., Figure 2 In some aspects, the transmission and / or reception of signals by the UE may be implemented via a bus interface of one or more processors (eg, controller / processor 280) that obtain and / or output signals.

[0080] Operation 800 may begin in box 802, where the UE receives a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses from at least one base station (BS), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group.

[0081] At 804, the UE performs one or more CSI-RS measurements for the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration.

[0082] At 806, the UE determines, for each of the one or more transmission hypotheses, a preferred receive beam for communicating with the at least one BS based at least in part on the one or more CSI-RS measurements.

[0083] At 808, the UE determines at least one of the one or more transmission hypotheses based at least in part on control signaling received from the at least one BS, wherein the control signaling includes at least one of a quasi co-located (QCL) information indication or a DMRS port group indication for DL ​​transmission.

[0084] At 810, the UE determines spatial reception parameters for DL ​​reception based at least in part on the determined preferred receive beam associated with the determined at least one hypothesis of the one or more transmission hypotheses.

[0085] Additionally, operations 800 may further include the UE transmitting, to the BS, an indication of a preferred receive beam for one or more of the transmission hypotheses. Additionally, operations 800 may further include communicating with the at least one BS using the preferred receive beam.

[0086] As described above, therefore, various aspects of the present disclosure provide techniques for improving Rx beam determination in multi-TRP scenarios. For example, in some cases, the UE may be configured by the BS / network to monitor a certain CSI-RS resource set or multiple CSI-RS resources, measure the CSI and determine the Rx beam(s) for a specific transmission hypothesis or multiple transmission hypotheses (e.g., the above-mentioned transmission hypotheses 1-5), where different CSI-RS resources can be associated with different TRPs. For example, since each TRP can be associated with a different DMRS port group ID, each CSI-RS resource can be associated with a different DMRS port group ID.

[0087] More specifically, for example, in some cases, the BS may transmit a CSI-RS resource configuration for one or more transmission hypotheses (e.g., as described above). In some cases, the CSI-RS resource configuration may include resources corresponding to at least a first DL DMRS port group (e.g., associated with a first TRP) and a second DL DMRS port group (e.g., associated with a second TRP).

[0088] In some cases, the CSI-RS resource configuration may include a single CSI-RS resource set. In this case, the single CSI-RS resource set may include a first CSI-RS resource corresponding to a first DL DMRS port group and a second CSI-RS resource corresponding to a second DL DMRS port group. According to various aspects, for each transmission hypothesis configured by the BS, the UE may determine a preferred Rx beam(s), as explained in more detail below.

[0089] In addition, for a single CSI-RS resource set, the BS can indicate to the UE what Tx assumption to consider when measuring the CSI-RS resource set. In some cases, the UE can buffer the received CSI-RS while performing one or more CSI-RS measurements and run offline measurements on different indicated transmission assumptions to determine the preferred Rx beam. In addition, as explained in more detail below, for a single CSI-RS resource set, the BS can also indicate the Tx assumption in the QCL information by picking one of the assumptions measured by the UE, or the UE can use the DMRS port group configuration to identify the full / partial assumption and further rely on certain other BS indications to finally decide on the Tx assumption.

[0090] In other cases, the CSI-RS resource configuration may include multiple CSI-RS resource sets and may indicate that each of the multiple CSI-RS resource sets corresponds to a different transmission hypothesis in one or more transmission hypotheses. In addition, each CSI-RS resource set may include at least one of a first CSI-RS resource corresponding to a first DL DMRS port group and a second CSI-RS resource corresponding to a second DL DMRS port group. According to various aspects, for each configured CSI-RS resource set / group and associated transmission scenario, the UE may determine (all) preferred Rx beams, as described in more detail below.

[0091] More specifically, for multiple CSI-RS resource sets, each CSI-RS resource set may have one / multiple dedicated transmission hypotheses for the UE to measure, as described in detail below. According to various aspects, if each CSI-RS resource set includes CSI-RS resources that are unique compared to another CSI-RS resource set, the UE may measure each resource set for the associated dedicated transmission hypothesis.

[0092] In addition, the BS may have greater flexibility to indicate QCL information about a transmission hypothesis through multiple CSI-RS sets compared to a single CSI-RS resource set. For example, the CSI-RS resource set ID may be used to indicate the transmission hypothesis, which may not be possible for a single CSI-RS resource set (e.g., because there is only a single CSI-RS resource set). In addition, in some cases, the QCL indication technique used in the single CSI-RS resource set scenario may also be used in the multiple CSI-RS resource set scenario.

[0093] According to various aspects, multiple sets of CSI-RS resource sets may include a first CSI-RS resource set, i.e., CSI-RS resource set / group #1a, which includes CSI-RS resource #1a that can be associated with a first DL DMRS port group and a transmission assumption 602 (e.g., wherein CSI-RS resource #1a is treated as a signal for CSI-RS measurement).

[0094] According to various aspects, the multiple sets of CSI-RS resource sets may include a second CSI-RS resource set, i.e., CSI-RS resource set / group #1b, which includes CSI-RS resource #1b that can be associated with a second DL DMRS port group and a transmission assumption 604 (e.g., wherein CSI-RS resource #1b is treated as a signal for CSI-RS measurement).

[0095] According to various aspects, the multiple sets of CSI-RS resource sets may include a third CSI-RS resource set, namely CSI-RS resource set / group #2, which includes CSI-RS resources #2a and #2b that can be associated with the first DL DMRS port group and the second DL DMRS port group, respectively, and a transmission assumption 608 (e.g., wherein both CSI-RS resources #2a and #2b are treated as signals for CSI-RS measurement).

[0096] According to various aspects, multiple sets of CSI-RS resource sets may include a fourth CSI-RS resource set, namely CSI-RS resource set / group #3a, which includes CSI-RS resources #3a1 and #3a2 that can be associated with the first DL DMRS port group and the second DL DMRS port group, respectively, and a transmission assumption 606 (for example, wherein CSI-RS resource #3a1 is treated as a signal for CSI-RS measurement, and CSI-RS resource #3a2 is treated as interference to the CSI-RS measurement).

[0097] According to various aspects, multiple sets of CSI-RS resource sets may include a fifth CSI-RS resource set, namely CSI-RS resource set / group #3b, which includes CSI-RS resources #3b1 and #3b2 that can be associated with the first DL DMRS port group and the second DL DMRS port group, respectively, and a transmission assumption 610 (for example, wherein CSI-RS resource #3b2 is treated as a signal for CSI-RS measurement, and CSI-RS resource #3b1 is treated as interference to the CSI-RS measurement).

[0098] It should be noted that CSI-RS resources from different CSI-RS resource sets / groups associated with the same DMRS port group ID may or may not be the same CSI-RS resource. For example, in some cases, CSI-RS resource #1a and CSI-RS resource 2a may be the same CSI-RS resource because both of them are associated with DMRS port group #1.

[0099] As described, in response to receiving a CSI-RS resource configuration, the UE may perform one or more CSI-RS measurements on the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration. According to various aspects, for a first transmission hypothesis of the one or more transmission hypotheses (e.g., as described above), performing the one or more CSI-RS measurements may include performing a first signal power CSI-RS measurement on a first CSI-RS resource corresponding to a first DL DMRS port group, without performing a second CSI-RS measurement on a second CSI-RS resource corresponding to a second DL DMRS port group.

[0100] According to various aspects, for a second transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement on a second CSI-RS resource corresponding to a second DL DMRS port group, without performing a second CSI-RS measurement on a first CSI-RS resource corresponding to a first DL DMRS port group.

[0101] According to various aspects, for a third transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement on a first CSI-RS resource corresponding to a first DL DMRS port group, and performing a second signal power CSI-RS measurement on a second CSI-RS resource corresponding to a second DL DMRS port group.

[0102] According to various aspects, for a fourth transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement on a first CSI-RS resource corresponding to a first DL DMRS port group, and performing an interference measurement on a second CSI-RS resource corresponding to a second DL DMRS port group.

[0103] According to various aspects, for a fifth transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement of a second CSI-RS resource corresponding to a second DL DMRS port group, and performing an interference measurement of a first CSI-RS resource corresponding to a first DL DMRS port group.

[0104] In some cases, once the UE has performed the one or more CSI-RS measurements described above, the UE may determine a preferred receive beam for communicating with the at least one BS for the one or more transmission hypotheses based at least in part on the one or more CSI-RS measurements. For example, according to various aspects, for the first transmission hypothesis, the second transmission hypothesis, and the third transmission hypothesis, determining the preferred receive beam may be based on maximizing the reception quality associated with the signal power CSI-RS measurement. For example, for the first transmission hypothesis, the second transmission hypothesis, and the third transmission hypothesis, the UE may select a receive beam that maximizes the reception quality associated with the signal power CSI-RS measurement for each of the transmission hypotheses.

[0105] According to aspects, for the fourth transmission hypothesis and the fifth transmission hypothesis, determining the preferred receive beam can be based on maximizing a channel interference plus noise ratio (SINR) associated with the one or more CSI-RS measurements.

[0106] For example, for the fourth transmission assumption, the UE may determine the signal power based on a first signal power CSI-RS measurement of the first CSI-RS resource. The UE may also determine the interference power based on an interference measurement of the second CSI-RS resource. The UE may then determine a receive beam that maximizes the SINR, which may be based on the signal power and the interference power (e.g., Where P is the signal power, I is the interference power and N is the noise). In other words, the UE can determine the receiving beam that maximizes P and minimizes I.

[0107] Similarly, for the fifth transmission assumption, the UE may determine the signal power based on the first signal power CSI-RS measurement of the second CSI-RS resource. The UE may also determine the interference power based on the interference measurement of the first CSI-RS resource. The UE may determine the receive beam that maximizes the SINR, which may be based on the signal power and the interference power.

[0108] According to various aspects, after determining the preferred receive beam for each transmission hypothesis, the UE can transmit an indication of the preferred receive beam to the BS. The UE can then use the preferred receive beam corresponding to the particular transmission hypothesis when communicating with the BS during the particular transmission hypothesis.

[0109] In some cases, in order to perform the one or more CSI-RS measurements, the UE may need to know which transmission hypothesis the CSI-RS resource or resource set is associated with. For example, in some cases, the UE may determine at least one of the transmission hypotheses based at least in part on control signaling received from the at least one BS, the control signaling including at least one of a QCL information indication or a DMRS port group indication for DL ​​transmission.

[0110] For example, in some cases, the BS may perform radio resource control (RRC) configuration of type D QCL information within a certain TCI state that contains the RS for QCL information as a CSI-RS resource set / group ID or just a group of multiple CSI-RS resources.

[0111] In some cases, such as when a CSI-RS resource configuration includes a single CSI-RS resource set, the QCL information may provide an indication of one or more transmission hypotheses associated with the CSI-RS resource configuration.

[0112] According to various aspects, when a CSI-RS resource configuration includes multiple CSI-RS resource sets and a resource set / group ID associated with a certain transmission hypothesis is used, additional indication of the transmission hypothesis may not be required in the QCL information. For example, when a CSI-RS resource configuration includes multiple CSI-RS resource sets and the QCL information provides an indication of at least one CSI-RS resource set ID identified by the CSI-RS resource configuration, the QCL information may not provide an explicit indication of one or more transmission hypotheses associated with the CSI-RS resource configuration.

[0113] However, when the CSI-RS resource configuration includes multiple CSI-RS resource sets and the resource set / group ID associated with a certain transmission scenario is not used, the additional indication of the transmission hypothesis may be optional. Thus, for example, in some cases, the QCL information may provide an indication of one or more transmission hypotheses associated with the CSI-RS resource configuration when the resource set / group ID associated with a certain transmission hypothesis is not used.

[0114] However, when the QCL information does not provide an indication of a resource set / group ID associated with a certain transmission hypothesis, the transmission hypothesis associated with the QCL information may be identified based on a DMRS port group ID identified from downlink control information (DCI) that schedules the PDSCH. That is, for example, the UE may determine at least one of the one or more transmission hypotheses based on a DMRS port group indication for DL ​​transmission in control signaling received from the BS.

[0115] For example, if only DMRS port group #1 is identified from the DCI, the UE may identify transmission hypothesis 602 or transmission hypothesis 606. In some cases, if only DMRS port group #2 is identified from the DCI, the UE may identify transmission hypothesis 604 or transmission hypothesis 610. In some cases, if both DMRS port group #1 and DMRS port group #2 are identified from the DCI, transmission hypothesis 608 may be identified.

[0116] According to various aspects, if a transmission scenario cannot be identified based on the DMRS port group identification (i.e., scenarios 1a and 1b), further identification of the partially identified scenario may be based on additional configuration / indications in the QCL information and / or DCI indication. In other words, when determining at least one of the one or more transmission hypotheses, the UE may not be able to distinguish which transmission hypothesis is correct between at least two transmission hypotheses. Thus, in this case, in addition to determining based on the DMRS port group indication, the UE may also determine the one or more transmission hypotheses based at least in part on the QCL information or other network configuration information.

[0117] According to various aspects, in some cases, the UE may determine spatial reception parameters for DL ​​reception based at least in part on a preferred receive beam associated with at least one of the transmission hypotheses identified. The UE may then perform DL reception based on the spatial reception parameters.

[0118] Fig. 9 The following describes operations that may include being configured to perform the techniques disclosed herein (such as Figure 7 900 includes various components (e.g., corresponding to means-plus-function components) of the communication device 900 and the operations explained in the foregoing. The communication device 900 includes a processing system 902 coupled to a transceiver 908. The transceiver 908 is configured to transmit and receive signals for the communication device 900 (such as, for example, various signals as described herein) via an antenna 910. The processing system 902 may be configured to perform processing functions for the communication device 900, including processing signals received and / or to be transmitted by the communication device 900.

[0119] The processing system 902 includes a processor 904 coupled to a computer-readable medium / memory 912 via a bus 906. In certain aspects, the computer-readable medium / memory 912 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 904, cause the processor 904 to perform operations described herein. In certain aspects, the computer-readable medium / memory 912 stores code 920 for transmitting a CSI-RS resource configuration, code 921 for transmitting control signaling, code 922 for transmitting one or more CSI-RS, and code 924 for receiving an indication of a preferred receive beam. In certain aspects, the processor 904 has a circuit system configured to implement the code stored in the computer-readable medium / memory 912. The processor 904 includes a circuit system 930 for transmitting a CSI-RS resource configuration, a circuit system 931 for transmitting control signaling, a circuit system 932 for transmitting one or more CSI-RS, and a circuit system 934 for receiving an indication of a preferred receive beam.

[0120] Fig.10 The following describes operations that may include being configured to perform the techniques disclosed herein (such as Figure 8 1000 includes a communication device 1000 including various components (e.g., corresponding to means plus function components) of the operations explained in the foregoing. The communication device 1000 includes a processing system 1002 coupled to a transceiver 1008. The transceiver 1008 is configured to transmit and receive signals for the communication device 1000 (such as, for example, various signals as described herein) via an antenna 1010. The processing system 1002 may be configured to perform processing functions for the communication device 1000, including processing signals received and / or to be transmitted by the communication device 1000.

[0121] The processing system 1002 includes a processor 1004 coupled to a computer readable medium / memory 1012 via a bus 1006. In some aspects, the computer readable medium / memory 1012 is configured to store instructions (e.g., computer executable code) that, when executed by the processor 1004, cause the processor 1004 to perform operations described herein. In some aspects, the computer readable medium / memory 1012 stores code 1020 for receiving a CSI-RS resource configuration, code 1022 for performing one or more CSI-RS measurements, code 1024 for determining a preferred receive beam, code 1026 for determining at least one transmission hypothesis, and code 1028 for determining spatial receive parameters. In some aspects, the processor 1004 has circuitry configured to implement the code stored in the computer readable medium / memory 1012. Processor 1004 includes a circuit system 1030 for receiving a CSI-RS resource configuration, a circuit system 1032 for performing one or more CSI-RS measurements, a circuit system 1034 for determining a preferred receive beam, a circuit system 1036 for determining at least one transmission hypothesis, and a circuit system 1038 for determining spatial reception parameters.

[0122] Example Embodiments

[0123] Embodiment 1: A method for wireless communication by a user equipment (UE) includes receiving a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses from at least one base station (BS), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; performing one or more CSI-RS measurements on the one or more transmission hypotheses based at least in part on the CSI-RS resource configuration; for each of the one or more transmission hypotheses, determining a preferred receiving beam for communicating with the at least one BS based at least in part on the one or more CSI-RS measurements; determining at least one of the one or more transmission hypotheses based at least in part on control signaling received from the at least one BS, wherein the control signaling includes at least one of a quasi-co-located (QCL) information indication or a DMRS port group indication for DL ​​transmission; and determining spatial reception parameters for DL ​​reception based at least in part on a determined preferred receiving beam associated with at least one of the determined one or more transmission hypotheses.

[0124] Embodiment 2: A method as described in Embodiment 1, wherein the CSI-RS resource configuration includes a single CSI-RS resource set, wherein the single CSI-RS resource set includes a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

[0125] Embodiment 3: A method as described in Embodiment 1, wherein: the CSI-RS resource configuration includes multiple CSI-RS resource sets; the CSI-RS resource configuration further indicates that each of the multiple CSI-RS resource sets corresponds to a different transmission hypothesis among the one or more transmission hypotheses; and each of the CSI-RS resource sets includes at least one of a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

[0126] Embodiment 4: A method as described in any one of embodiments 1 to 3, wherein performing one or more CSI-RS measurements on the one or more transmission hypotheses includes at least one of the following: for a first transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement on a first CSI-RS resource corresponding to the first DL DMRS port group, without performing a second CSI-RS measurement on a second CSI-RS resource corresponding to the second DL DMRS port group; for a second transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement on a second CSI-RS resource corresponding to the second DL DMRS port group, without performing a second CSI-RS measurement on the first CSI-RS resource corresponding to the first DL DMRS port group; for a third transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement on a first CSI-RS resource corresponding to the first DL DMRS port group and performing a second CSI-RS measurement on a second CSI-RS resource corresponding to the second DL DMRS port group. a second signal power CSI-RS measurement of a second CSI-RS resource corresponding to the first DL DMRS port group; for a fourth transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement of a first CSI-RS resource corresponding to the first DL DMRS port group and performing an interference measurement of a second CSI-RS resource corresponding to the second DL DMRS port group; or for a fifth transmission hypothesis among the one or more transmission hypotheses, performing the one or more CSI-RS measurements includes performing a first signal power CSI-RS measurement of a second CSI-RS resource corresponding to the second DL DMRS port group and performing an interference measurement of a first CSI-RS resource corresponding to the first DL DMRS port group.

[0127] Embodiment 5: A method as described in Embodiment 4, wherein for the first transmission hypothesis, the second transmission hypothesis and the third transmission hypothesis, determining the preferred reception beam is based on maximizing the reception quality associated with the signal power CSI-RS measurement.

[0128] Embodiment 6: A method as described in Embodiment 4 or 5, wherein for the fourth transmission assumption: determining the preferred receive beam is based on maximizing the channel interference plus noise ratio (SINR) associated with the one or more CSI-RS measurements; signal power is determined based on the first signal power CSI-RS measurement of the first CSI-RS resource; interference power is determined based on the interference measurement of the second CSI-RS resource; and the SINR is based on the signal power and the interference power.

[0129] Embodiment 7: A method as described in any one of embodiments 4 to 6, wherein for the fifth transmission assumption: determining the preferred receive beam is based on maximizing the channel interference plus noise ratio (SINR) associated with the one or more CSI-RS measurements; signal power is determined based on the first signal power CSI-RS measurement of the second CSI-RS resource; interference power is determined based on the interference measurement of the first CSI-RS resource; and the SINR is based on the signal power and the interference power.

[0130] Embodiment 8: A method as described in any one of embodiments 1 to 7, wherein the one or more transmission assumptions include one or more of the following: for a first transmission assumption, a signal is received from the first DL DMRS port group, and a signal from the second DL DMRS port group is suppressed; for a second transmission assumption, a signal is received from the second DL DMRS port group, and a signal from the first DL DMRS port group is suppressed; for a third transmission assumption, a signal is received from both the first DL DMRS port group and the second DL DMRS port group without interference; for a fourth transmission assumption, a signal is received from the first DL DMRS port group, and an interference signal is received from the second DL DMRS port group; or for a fifth transmission assumption, a signal is received from the second DL DMRS port group, and an interference signal is received from the first DL DMRS port group.

[0131] Embodiment 9: A method as described in any one of embodiments 1, 2, 4, 5, 6, 7 or 8, wherein the CSI-RS resource configuration includes a single CSI-RS resource set; the QCL information provides an indication of the one or more transmission assumptions associated with the CSI-RS resource configuration; and determining at least one of the one or more transmission assumptions is based on the indication of the one or more transmission assumptions associated with the CSI-RS resource configuration in the QCL information.

[0132] Embodiment 10: A method as described in any one of embodiments 1, 3, 4, 5, 6, 7 or 8, wherein the CSI-RS resource configuration includes multiple CSI-RS resource sets; the QCL information provides an indication of the one or more transmission assumptions associated with the CSI-RS resource configuration; and determining at least one of the one or more transmission assumptions is based on the indication of the one or more transmission assumptions associated with the CSI-RS resource configuration in the QCL information.

[0133] Embodiment 11: A method as described in any one of embodiments 1, 3, 4, 5, 6, 7 or 8, wherein the CSI-RS resource configuration includes multiple CSI-RS resource sets; and the QCL information provides an indication of at least one of the CSI-RS resource set IDs identified from the CSI-RS resource configuration without providing an explicit indication of the one or more transmission assumptions associated with the CSI-RS resource configuration; and determining at least one of the one or more transmission assumptions is based on the indication in the QCL information of at least one of the CSI-RS resource set IDs identified from the CSI-RS resource configuration.

[0134] Embodiment 12: A method as described in any one of embodiments 1, 3, 4, 5, 6, 7 or 8, wherein the CSI-RS resource configuration includes multiple CSI-RS resource sets and the QCL information does not provide an indication of any CSI-RS resource set ID identified from the CSI-RS resource configuration, and does not provide an indication of the one or more transmission assumptions associated with the CSI-RS resource configuration.

[0135] Embodiment 13: The method as described in any one of embodiments 1 to 12, wherein determining at least one transmission hypothesis of the one or more transmission hypotheses is based on the DMRS port group indication for DL ​​transmission in the control signaling.

[0136] Embodiment 14: A method as described in Embodiment 13, wherein at least one of the one or more transmission hypotheses determined includes at least two transmission hypotheses, and the method further includes determining the at least two transmission hypotheses based at least in part on the QCL information or other network configuration information.

[0137] Embodiment 15: A method for wireless communication by a base station (BS) includes transmitting a channel state information reference signal (CSI-RS) resource configuration for one or more transmission hypotheses to a user equipment (UE), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; transmitting control signaling indicating at least one of the one or more transmission hypotheses to the UE, wherein the control signaling includes at least one of a quasi-co-located (QCL) information indication associated with a spatial reception parameter for DL ​​reception or a DMRS port group indication for DL ​​transmission; transmitting one or more CSI-RSs according to the CSI-RS resource configuration; and receiving an indication of a preferred reception beam for one or more of these transmission hypotheses from the UE.

[0138] Embodiment 16: A method as described in Embodiment 15, wherein the CSI-RS resource configuration includes a single CSI-RS resource set, wherein the single CSI-RS resource set includes a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

[0139] Embodiment 17: A method as described in Embodiment 15, wherein the CSI-RS resource configuration includes multiple CSI-RS resource sets; the CSI-RS resource configuration further indicates that each of the multiple CSI-RS resource sets corresponds to a different transmission hypothesis among the one or more transmission hypotheses; and each of the CSI-RS resource sets includes at least one of a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

[0140] Embodiment 18: A method as described in any one of embodiments 15 to 17, wherein the one or more transmission assumptions include one or more of the following: for a first transmission assumption, the UE receives a signal from the first DL DMRS port group, and the signal from the second DL DMRS port group is suppressed; for a second transmission assumption, the UE receives a signal from the second DL DMRS port group, and the signal from the first DL DMRS port group is suppressed; for a third transmission assumption, the UE receives signals from both the first DL DMRS port group and the second DL DMRS port group without interference; for a fourth transmission assumption, the UE receives a signal from the first DL DMRS port group, and receives an interference signal from the second DL DMRS port group; or for a fifth transmission assumption, the UE receives a signal from the second DL DMRS port group, and receives an interference signal from the first DL DMRS port group.

[0141] Embodiment 19: A method as described in any of embodiments 15, 16 or 18, wherein the CSI-RS resource configuration includes a single CSI-RS resource set, and the QCL information provides an indication of the one or more transmission assumptions associated with the CSI-RS resource configuration.

[0142] Embodiment 20: A method as described in any one of embodiments 15, 17 or 18, wherein the CSI-RS resource configuration includes multiple CSI-RS resource sets, and the QCL information provides an indication of the one or more transmission assumptions associated with the CSI-RS resource configuration.

[0143] Embodiment 21: A method as described in any of embodiments 15, 17 or 18, wherein the CSI-RS resource configuration includes multiple CSI-RS resource sets and the QCL information provides an indication of at least one of the CSI-RS resource set IDs identified from the CSI-RS resource configuration without providing an explicit indication of the one or more transmission assumptions associated with the CSI-RS resource configuration.

[0144] Embodiment 22: A method as described in any one of embodiments 15, 17 or 18, wherein the CSI-RS resource configuration includes multiple CSI-RS resource sets and the QCL information does not provide an indication of any CSI-RS resource set ID identified from the CSI-RS resource configuration, and does not provide an indication of the one or more transmission assumptions associated with the CSI-RS resource configuration.

[0145] Embodiment 23: The method as described in any one of embodiments 1 to 22, wherein indicating at least one transmission hypothesis of the one or more transmission hypotheses is based on the DMRS port group indication for DL ​​transmission in the control signaling.

[0146] Embodiment 24: A method as described in Embodiment 23, wherein the at least one transmission hypothesis among the one or more transmission hypotheses indicated based on the DMRS port group includes at least two transmission hypotheses, and the at least two transmission hypotheses are further indicated at least in part based on the QCL information or other network configuration information.

[0147] Additional considerations

[0148] The techniques described herein may 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 may 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 may 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), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are parts of Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. 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.

[0149] In 3GPP, the term "cell" may 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 term "cell" and BS, next-generation Node B (gNB or g B Node), access point (AP), distributed unit (DU), carrier, or transmission reception point (TRP) may be used interchangeably. The BS may provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., a radius of several thousand meters) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a residence, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS.

[0150] 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, biometric sensor / device, wearable device (such as smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music device, video device, satellite radio, etc.), transportation 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 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. A wireless node can provide connectivity for or to a network (e.g., a wide area network (such as the Internet) or a cellular network), for example, 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.

[0151] In some examples, access to the air interface may be scheduled. A scheduling entity (e.g., BS) allocates resources for communication between some or all devices and equipment within its service area or cell. A scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities utilize resources allocated by the scheduling entity. A base station is not the only entity that can be used as a scheduling entity. In some examples, a UE may be used as a scheduling entity, and resources for one or more subordinate entities (e.g., one or more other UEs) may be scheduled, and other UEs may use 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 in a mesh network. In a mesh network example, UEs may communicate directly with each other in addition to communicating with a scheduling entity.

[0152] Each method disclosed herein includes one or more steps or actions for implementing the method. These method steps and / or actions can be interchangeable with each other without departing from the scope of the claims. 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 changed without departing from the scope of the claims.

[0153] 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 with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0154] 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, and the like. Also, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Also, "determining" may include resolving, selecting, choosing, establishing, and the like.

[0155] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be easily understood by those skilled in the art, and the universal principles defined herein can be applied to other aspects. Thus, the claims are not intended to be limited to the various aspects shown herein, but should be granted the full scope consistent with the language of the claims, wherein the singular reference to the element is not intended to mean "there is and only one" (unless specifically stated) but "one or more". Unless otherwise specifically stated, the term "some / some" refers to one or more. The elements of the various aspects described throughout this disclosure are all structural and functional equivalents currently or hereafter known to those of ordinary skill in the art and are expressly incorporated herein by reference, and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be donated to the public, regardless of whether such disclosure is explicitly recorded in the claims. Any element of the claim should not be interpreted under the provisions of 35 U.S.C. § 112 (f), unless the element is explicitly stated using the phrase "device for..." or in the case of a method claim, the element is stated using the phrase "step for...".

[0156] The various operations of the methods described above may be performed by any suitable device capable of performing the corresponding functions. These devices 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 illustrated in the accompanying drawings, these operations may have corresponding paired device-plus-function components with similar numbers.

[0157] The various illustrative 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 in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0158] 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 a user terminal (see Figure 1 ), a user interface (e.g., a keypad, 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, and the like, 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 circuit systems capable of executing software. Those skilled in the art will recognize how to best implement the functionality described with respect to the processing system, depending on the specific application and the overall design constraints imposed on the overall system.

[0159] If implemented in software, each function may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Software should be broadly interpreted to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or other. Computer-readable media include both computer storage media and communication media, which include any media that facilitate the transfer of computer programs from one place to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, a storage medium may be integrated into a processor. As an example, a machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separated from a wireless node, all of which may be accessed by a processor through a bus interface. Alternatively or additionally, a machine-readable medium or any part thereof may be integrated into a processor, such as a cache and / or a general register file, which may be the case. As an 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 implemented in a computer program product.

[0160] A software module may include a single instruction, or many instructions, and may be distributed over several different code segments, distributed between different programs, and distributed across multiple storage media. A computer-readable medium may include several software modules. These software modules include instructions that cause a processing system to perform various functions when executed by an apparatus such as a processor. These software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or may be distributed across multiple storage devices. As an example, when a triggering event occurs, a software module may be loaded into a RAM from a hard drive. During the execution of a software module, a processor may load some instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by the processor. When describing the functionality of a software module as described below, it will be understood that such functionality is implemented by the processor when the processor executes instructions from the software module.

[0161] Any connection is also properly referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared (IR), radio, and microwave), then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) is included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Disks, where disks often reproduce data magnetically, and discs reproduce data optically with lasers. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Additionally, for other aspects, computer-readable media may include transient computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0162] 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 stored (and / or encoded) thereon instructions that can be executed by one or more processors to perform the operations described herein, such as for performing the operations described herein and in Figure 7 and / or Figure 8 Instructions for the operations explained in .

[0163] In addition, it should be appreciated that modules and / or other appropriate means for performing the methods and techniques described herein may be downloaded and / or otherwise obtained by a user terminal and / or base station where applicable. For example, such a device can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage device (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk, etc.) so that once the storage device is coupled to or provided to a user terminal and / or base station, the device can obtain the various methods. In addition, any other suitable technology suitable for providing the methods and techniques described herein to a device may be utilized.

[0164] It will be understood that the claims are not limited to the precise configuration and components illustrated above. Various changes, substitutions 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) in a multiple transmission reception point (TRP) wireless communication system, comprising: receiving, from at least one base station (BS), a channel state information reference signal (CSI-RS) resource configuration for a plurality of transmission hypotheses, wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; performing a plurality of CSI-RS measurements for the plurality of transmission hypotheses based at least in part on the CSI-RS resource configuration; determining, for each of the plurality of transmission hypotheses, a preferred receive beam for communicating with the at least one BS based at least in part on the plurality of CSI-RS measurements; determining at least one transmission hypothesis of the plurality of transmission hypotheses based at least in part on control signaling received from the at least one BS, wherein the control signaling comprises at least one of a quasi co-located (QCL) information indication or a DMRS port group indication for DL ​​transmission; determining spatial reception parameters for DL ​​reception based at least in part on the determined preferred receive beam associated with the determined at least one hypothesis of the plurality of transmission hypotheses; as well as An indication of the preferred receive beam for the plurality of transmission hypotheses is transmitted to the at least one BS.

2. The method of claim 1, wherein: The CSI-RS resource configuration includes a single CSI-RS resource set; and The single CSI-RS resource set includes a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

3. The method of claim 1, wherein: The CSI-RS resource configuration includes multiple CSI-RS resource sets; The CSI-RS resource configuration further indicates that each of the plurality of CSI-RS resource sets corresponds to a different transmission hypothesis of the plurality of transmission hypotheses; and Each CSI-RS resource set includes at least one of a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

4. The method of claim 1 , wherein performing the plurality of CSI-RS measurements for the plurality of transmission hypotheses comprises at least one of: For a first transmission hypothesis of the plurality of transmission hypotheses, performing the plurality of CSI-RS measurements includes performing a first signal power CSI-RS measurement on a first CSI-RS resource corresponding to the first DL DMRS port group, without performing a second CSI-RS measurement on a second CSI-RS resource corresponding to the second DL DMRS port group; For a second transmission hypothesis of the plurality of transmission hypotheses, performing the plurality of CSI-RS measurements includes performing a first signal power CSI-RS measurement on a second CSI-RS resource corresponding to the second DL DMRS port group without performing a second CSI-RS measurement on a first CSI-RS resource corresponding to the first DL DMRS port group; For a third transmission hypothesis of the plurality of transmission hypotheses, performing the plurality of CSI-RS measurements includes performing a first signal power CSI-RS measurement on a first CSI-RS resource corresponding to the first DL DMRS port group and performing a second signal power CSI-RS measurement on a second CSI-RS resource corresponding to the second DL DMRS port group; For a fourth transmission hypothesis of the plurality of transmission hypotheses, performing the plurality of CSI-RS measurements comprises performing a first signal power CSI-RS measurement on a first CSI-RS resource corresponding to the first DL DMRS port group and performing an interference measurement on a second CSI-RS resource corresponding to the second DL DMRS port group; or For a fifth transmission hypothesis among the multiple transmission hypotheses, performing the multiple CSI-RS measurements includes performing a first signal power CSI-RS measurement on a second CSI-RS resource corresponding to the second DL DMRS port group and performing an interference measurement on a first CSI-RS resource corresponding to the first DL DMRS port group.

5. The method of claim 4, wherein: Determining the preferred receive beam is based on maximizing a reception quality associated with the signal power CSI-RS measurement for the first transmission hypothesis, the second transmission hypothesis, and the third transmission hypothesis.

6. The method of claim 4, wherein for the fourth transmission assumption: Determining the preferred receive beam is based on maximizing a channel interference plus noise ratio (SINR) associated with the one or more CSI-RS measurements; signal power is determined based on the first signal power CSI-RS measurement of the first CSI-RS resource; Interference power is determined based on the interference measurement of the second CSI-RS resource; and The SINR is based on the signal power and the interference power.

7. The method of claim 4, wherein for the fifth transmission assumption: Determining the preferred receive beam is based on maximizing a channel interference plus noise ratio (SINR) associated with the one or more CSI-RS measurements; signal power is determined based on the first signal power CSI-RS measurement of the second CSI-RS resource; Interference power is determined based on the interference measurement of the first CSI-RS resource; and The SINR is based on the signal power and the interference power.

8. The method of claim 1 , wherein the plurality of transmission hypotheses comprises one or more of: For a first transmission assumption, a signal is received from the first DL DMRS port group, while a signal from the second DL DMRS port group is suppressed; For a second transmission assumption, a signal is received from the second DL DMRS port group, while a signal from the first DL DMRS port group is suppressed; For a third transmission assumption, signals are received from both the first DL DMRS port group and the second DL DMRS port group without interference; For a fourth transmission assumption, a signal is received from the first DL DMRS port group, and an interference signal is received from the second DL DMRS port group; or For a fifth transmission assumption, a signal is received from the second DL DMRS port group, and an interference signal is received from the first DL DMRS port group.

9. The method of claim 1, wherein: The CSI-RS resource configuration includes a single CSI-RS resource set; The QCL information provides an indication of the plurality of transmission hypotheses associated with the CSI-RS resource configuration; and Determining at least one of the plurality of transmission hypotheses is based on the indication in the QCL information of the plurality of transmission hypotheses associated with the CSI-RS resource configuration.

10. The method of claim 1, wherein: The CSI-RS resource configuration includes multiple CSI-RS resource sets; The QCL information provides an indication of the plurality of transmission hypotheses associated with the CSI-RS resource configuration; and Determining at least one of the plurality of transmission hypotheses is based on the indication in the QCL information of the plurality of transmission hypotheses associated with the CSI-RS resource configuration.

11. The method of claim 1, wherein: The CSI-RS resource configuration includes multiple CSI-RS resource sets; The QCL information provides an indication of at least one CSI-RS resource set ID identified by the CSI-RS resource configuration without providing an explicit indication of the plurality of transmission hypotheses associated with the CSI-RS resource configuration; and Determining at least one transmission hypothesis of the plurality of transmission hypotheses is based on the indication of the at least one CSI-RS resource set ID.

12. The method of claim 1, wherein: The CSI-RS resource configuration includes a plurality of CSI-RS resource sets; and The QCL information does not provide an indication of any CSI-RS resource set ID identified from the CSI-RS resource configuration and does not provide an indication of the plurality of transmission hypotheses associated with the CSI-RS resource configuration.

13. The method of claim 1, wherein: Determining at least one transmission hypothesis of the plurality of transmission hypotheses is based on the DMRS port group indication for DL ​​transmission in the control signaling.

14. The method of claim 13, wherein the determined at least one of the multiple transmission hypotheses includes at least two transmission hypotheses, and the method further comprises determining the at least two transmission hypotheses based at least in part on the QCL information or other network configuration information.

15. A method for wireless communication by a base station (BS) in a multiple transmission reception point (TRP) wireless communication system, comprising: transmitting a channel state information reference signal (CSI-RS) resource configuration for a plurality of transmission hypotheses to a user equipment (UE), wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; transmitting control signaling indicating at least one of the plurality of transmission hypotheses to the UE, wherein the control signaling comprises at least one of a quasi co-located (QCL) information indication associated with a spatial reception parameter for DL ​​reception or a DMRS port group indication for DL ​​transmission; transmitting one or more CSI-RS according to the CSI-RS resource configuration; as well as An indication of a preferred receive beam for the plurality of transmission hypotheses is received from the UE.

16. The method of claim 15, wherein: The CSI-RS resource configuration includes a single CSI-RS resource set; and The single CSI-RS resource set includes a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

17. The method of claim 15, wherein: The CSI-RS resource configuration includes multiple CSI-RS resource sets; The CSI-RS resource configuration further indicates that each of the plurality of CSI-RS resource sets corresponds to a different transmission hypothesis of the plurality of transmission hypotheses; and Each CSI-RS resource set includes at least one of a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

18. The method of claim 15, wherein the plurality of transmission hypotheses comprises one or more of: For a first transmission assumption, the UE receives a signal from the first DL DMRS port group, while a signal from the second DL DMRS port group is suppressed; For a second transmission assumption, the UE receives signals from the second DL DMRS port group, while signals from the first DL DMRS port group are suppressed; For a third transmission assumption, the UE receives signals from both the first DL DMRS port group and the second DL DMRS port group without interference; For a fourth transmission assumption, the UE receives a signal from the first DL DMRS port group and simultaneously receives an interference signal from the second DL DMRS port group; or For a fifth transmission assumption, the UE receives a signal from the second DL DMRS port group and simultaneously receives an interference signal from the first DL DMRS port group.

19. The method of claim 15, wherein: The CSI-RS resource configuration includes a single CSI-RS resource set; and The QCL information provides an indication of the plurality of transmission hypotheses associated with the CSI-RS resource configuration.

20. The method of claim 15, wherein: The CSI-RS resource configuration includes a plurality of CSI-RS resource sets; and The QCL information provides an indication of the plurality of transmission hypotheses associated with the CSI-RS resource configuration.

21. The method of claim 15, wherein: The CSI-RS resource configuration includes a plurality of CSI-RS resource sets; and The QCL information provides an indication of at least one CSI-RS resource set ID identified by the CSI-RS resource configuration without providing an explicit indication of the plurality of transmission hypotheses associated with the CSI-RS resource configuration.

22. The method of claim 15, wherein: The CSI-RS resource configuration includes a plurality of CSI-RS resource sets; and The QCL information does not provide an indication of any CSI-RS resource set ID identified from the CSI-RS resource configuration and does not provide an indication of the plurality of transmission hypotheses associated with the CSI-RS resource configuration.

23. The method of claim 15, wherein: Indicating that at least one transmission hypothesis among the plurality of transmission hypotheses is based on the DMRS port group indication for DL ​​transmission in the control signaling.

24. The method of claim 23, wherein the at least one transmission hypothesis among the multiple transmission hypotheses indicated based on the DMRS port group includes at least two transmission hypotheses, and the at least two transmission hypotheses are further indicated based at least in part on the QCL information or other network configuration information.

25. An apparatus for wireless communication by a user equipment (UE) in a multiple transmission reception point (TRP) wireless communication system, comprising: at least one processor configured to: receiving, from at least one base station (BS), a channel state information reference signal (CSI-RS) resource configuration for a plurality of transmission hypotheses, wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; performing a plurality of CSI-RS measurements for the plurality of transmission hypotheses based at least in part on the CSI-RS resource configuration; determining, for each of the plurality of transmission hypotheses, a preferred receive beam for communicating with the at least one BS based at least in part on the one or more CSI-RS measurements; determining at least one transmission hypothesis of the plurality of transmission hypotheses based at least in part on control signaling received from the at least one BS, wherein the control signaling comprises at least one of a quasi co-located (QCL) information indication or a DMRS port group indication for DL ​​transmission; determining spatial receive parameters for DL ​​reception based at least in part on the determined preferred receive beam associated with the determined at least one of the plurality of transmission hypotheses; and transmitting to the at least one BS an indication of the preferred receive beam for the plurality of transmission hypotheses; and A memory coupled to the at least one processor.

26. The apparatus of claim 25, wherein: The CSI-RS resource configuration includes a single CSI-RS resource set; and The single CSI-RS resource set includes a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

27. The apparatus of claim 25, wherein: The CSI-RS resource configuration includes multiple CSI-RS resource sets; The CSI-RS resource configuration further indicates that each of the plurality of CSI-RS resource sets corresponds to a different transmission hypothesis of the plurality of transmission hypotheses; and Each CSI-RS resource set includes at least one of a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

28. An apparatus for wireless communication by a base station (BS) in a multiple transmission reception point (TRP) wireless communication system, comprising: at least one processor configured to: transmitting, from at least one base station (BS), a channel state information reference signal (CSI-RS) resource configuration for a plurality of transmission hypotheses, wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS) port group and a second DL DMRS port group; transmitting control signaling indicating at least one of the plurality of transmission hypotheses to the UE, wherein the control signaling comprises at least one of a quasi co-located (QCL) information indication associated with a spatial reception parameter for DL ​​reception or a DMRS port group indication for DL ​​transmission; transmitting one or more CSI-RS according to the CSI-RS resource configuration; as well as receiving, from the UE, an indication of a preferred receive beam for the plurality of transmission hypotheses; as well as A memory coupled to the at least one processor.

29. The apparatus of claim 28, wherein: The CSI-RS resource configuration includes a single CSI-RS resource set; and The single CSI-RS resource set includes a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

30. The apparatus of claim 28, wherein: The CSI-RS resource configuration includes multiple CSI-RS resource sets; The CSI-RS resource configuration further indicates that each of the plurality of CSI-RS resource sets corresponds to a different transmission hypothesis of the plurality of transmission hypotheses; and Each CSI-RS resource set includes at least one of a first CSI-RS resource corresponding to the first DL DMRS port group and a second CSI-RS resource corresponding to the second DL DMRS port group.

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