WO2022155896A1 - User equipment-determined single transmission-reception point and multi-transmission-reception point channel state information reporting - Google Patents
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Definitions
- aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to user equipment (UE) -determined single transmission-reception point (sTRP) and multi-transmission-reception point (mTRP) channel state information (CSI) reporting.
- UE user equipment
- sTRP single transmission-reception point
- mTRP multi-transmission-reception point
- CSI channel state information
- Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
- UTRAN Universal Terrestrial Radio Access Network
- the UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS) , a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP) .
- UMTS Universal Mobile Telecommunications System
- 3GPP 3rd Generation Partnership Project
- multiple-access network formats include Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, and Single-Carrier FDMA (SC-FDMA) networks.
- CDMA Code Division Multiple Access
- TDMA Time Division Multiple Access
- FDMA Frequency Division Multiple Access
- OFDMA Orthogonal FDMA
- SC-FDMA Single-Carrier FDMA
- a wireless communication network may include a number of base stations or node Bs that can support communication for a number of user equipments (UEs) .
- a UE may communicate with a base station via downlink and uplink.
- the downlink (or forward link) refers to the communication link from the base station to the UE
- the uplink (or reverse link) refers to the communication link from the UE to the base station.
- a base station may transmit data and control information on the downlink to a UE and/or may receive data and control information on the uplink from the UE.
- a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters.
- RF radio frequency
- a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.
- a method of wireless communication includes determining, by a user equipment (UE) , to prepare a channel state information (CSI) report according to a predetermined CSI report configuration, determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-reference signal (CSI-RS) resource with a single transmission configuration indication (TCI) state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both, transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CSI-reference signal (CSI-RS) resource indicator (CRI) , and at least one rank
- CSI-RS
- a method of wireless communication includes receiving, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI, determining, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type, and receiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- an apparatus configured for wireless communication includes means for determining, by a UE, to prepare a CSI report according to a predetermined CSI report configuration, means for determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both, means for transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI, and means for transmitting, by the UE, a second CSI report part of the CSI report, wherein the CSI hypothesis type includes one of
- an apparatus configured for wireless communication includes means for receiving, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI, means for determining, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type, and means for receiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- a non-transitory computer-readable medium having program code recorded thereon.
- the program code further includes code to determine, by a UE, to prepare a CSI report according to a predetermined CSI report configuration, code to determine, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both, code to transmit, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI, and code to transmit, by the UE, a second
- a non-transitory computer-readable medium having program code recorded thereon.
- the program code further includes code to receive, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI, code to determine, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type, and code to receive, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- an apparatus configured for wireless communication.
- the apparatus includes at least one processor, and a memory coupled to the processor.
- the processor is configured to determine, by a UE, to prepare a CSI report according to a predetermined CSI report configuration, to determine, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both, to transmit, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI, and to transmit, by the UE,
- an apparatus configured for wireless communication.
- the apparatus includes at least one processor, and a memory coupled to the processor.
- the processor is configured to receive, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI, to determine, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type, and to receive, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- FIG. 1 is a block diagram illustrating details of a wireless communication system.
- FIG. 2 is a block diagram illustrating a design of a base station and a UE configured according to one aspect of the present disclosure.
- FIGs. 3A-3C are block diagrams illustrating CSI reporting configurations for mTRP CSI reporting.
- FIG. 4A is a block diagram illustrating example blocks executed by a UE to implement one aspect of the present disclosure.
- FIG. 4B is a block diagram illustrating example blocks executed by a UE to determine a CSI hypothesis type according to one aspect of the present disclosure.
- FIG. 4C is a block diagram illustrating example blocks executed by a base station to implement one aspect of the present disclosure.
- FIG. 5 is a call flow diagram illustrating single and multi-resource CSI reporting between a UE and TRPs according to aspects of the present disclosure.
- FIG. 6 is a block diagram illustrating an example UE configured according to one aspect of the present disclosure.
- FIG. 7 is a block diagram illustrating an example base station configured according to one aspect of the present disclosure.
- wireless communications networks This disclosure relates generally to providing or participating in authorized shared access between two or more wireless communications systems, also referred to as wireless communications networks.
- the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5 th Generation (5G) or new radio (NR) networks, as well as other communications networks.
- CDMA code division multiple access
- TDMA time division multiple access
- FDMA frequency division multiple access
- OFDMA orthogonal FDMA
- SC-FDMA single-carrier FDMA
- LTE long-term evolution
- GSM Global System for Mobile communications
- 5G 5 th Generation
- NR new radio
- An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
- E-UTRA evolved UTRA
- GSM Global System for Mobile Communications
- LTE long term evolution
- UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP)
- cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
- 3GPP 3rd Generation Partnership Project
- 3GPP long term evolution LTE
- UMTS universal mobile telecommunications system
- the 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices.
- the present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
- 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface.
- further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks.
- the 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with an ultra-high density (e.g., ⁇ 1M nodes/km 2 ) , ultra-low complexity (e.g., ⁇ 10s of bits/sec) , ultra-low energy (e.g., ⁇ 10+ years of battery life) , and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ⁇ 99.9999%reliability) , ultra-low latency (e.g., ⁇ 1 ms) , and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ⁇ 10 Tbps/km 2 ) , extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates) , and deep awareness with advanced discovery and optimizations.
- IoTs Internet of things
- the 5G NR may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI) ; having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility.
- TTI transmission time interval
- MIMO massive multiple input, multiple output
- mmWave millimeter wave
- Scalability of the numerology in 5G NR with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments.
- subcarrier spacing may occur with 15 kHz, for example over 1, 5, 10, 20 MHz, and the like bandwidth.
- subcarrier spacing may occur with 30 kHz over 80/100 MHz bandwidth.
- the subcarrier spacing may occur with 60 kHz over a 160 MHz bandwidth.
- subcarrier spacing may occur with 120 kHz over a 500 MHz bandwidth.
- the scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency.
- QoS quality of service
- 5G NR also contemplates a self-contained integrated subframe design with uplink/downlink scheduling information, data, and acknowledgement in the same subframe.
- the self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink/downlink that may be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet the current traffic needs.
- an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways.
- an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein.
- such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein.
- a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer.
- an aspect may comprise at least one element of a claim.
- FIG. 1 is a block diagram illustrating an example of a wireless communications system 100 that supports single resource and multi-resource CSI reporting in accordance with aspects of the present disclosure.
- the wireless communications system 100 includes base stations 105, UEs 115, and a core network 130.
- the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or NR network.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-A Pro LTE-A Pro
- NR NR network.
- wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low-cost and low-complexity devices.
- ultra-reliable e.g., mission critical
- Base stations 105 may wirelessly communicate with UEs 115 via one or more base station antennas.
- Base stations 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or some other suitable terminology.
- Wireless communications system 100 may include base stations 105 of different types (e.g., macro or small cell base stations) .
- the UEs 115 described herein may be able to communicate with various types of base stations 105 and network equipment including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like.
- Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 is supported. Each base station 105 may provide communication coverage for a respective geographic coverage area 110 via communication links 125, and communication links 125 between a base station 105 and a UE 115 may utilize one or more carriers. Communication links 125 shown in wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115. Downlink transmissions may also be referred to as forward link transmissions while uplink transmissions may also be referred to as reverse link transmissions.
- the geographic coverage area 110 for a base station 105 may be divided into sectors making up a portion of the geographic coverage area 110, and each sector may be associated with a cell.
- each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other types of cells, or various combinations thereof.
- a base station 105 may be movable and, therefore, provide communication coverage for a moving geographic coverage area 110.
- different geographic coverage areas 110 associated with different technologies may overlap, and overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or by different base stations 105.
- the wireless communications system 100 may include, for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.
- the term “cell” refers to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) , and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) operating via the same or a different carrier.
- a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband Internet-of-things (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of devices.
- MTC machine-type communication
- NB-IoT narrowband Internet-of-things
- eMBB enhanced mobile broadband
- the term “cell” may refer to a portion of a geographic coverage area 110 (e.g., a sector) over which the logical entity operates.
- UEs 115 may be dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
- a UE 115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client.
- a UE 115 may also be a personal electronic device such as a cellular phone (UE 115a) , a personal digital assistant (PDA) , a wearable device (UE 115d) , a tablet computer, a laptop computer (UE 115g) , or a personal computer.
- PDA personal digital assistant
- a UE 115 may also refer to a wireless local loop (WLL) station, an Internet-of-things (IoT) device, an Internet-of-everything (IoE) device, an MTC device, or the like, which may be implemented in various articles such as appliances, vehicles (UE 115e and UE 115f) , meters (UE 115b and UE 115c) , or the like.
- WLL wireless local loop
- IoT Internet-of-things
- IoE Internet-of-everything
- Some UEs 115 may be low cost or low complexity devices, and may provide for automated communication between machines (e.g., via machine-to-machine (M2M) communication) .
- M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention.
- M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application program that can make use of the information or present the information to humans interacting with the program or application.
- Some UEs 115 may be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
- Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for UEs 115 include entering a power saving “deep sleep” mode when not engaging in active communications, or operating over a limited bandwidth (e.g., according to narrowband communications) . In other cases, UEs 115 may be designed to support critical functions (e.g., mission critical functions) , and a wireless communications system 100 may be configured to provide ultra-reliable communications for these functions.
- critical functions e.g., mission critical functions
- a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol) .
- P2P peer-to-peer
- D2D device-to-device
- One or more of a group of UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
- Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105, or be otherwise unable to receive transmissions from a base station 105.
- groups of UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group.
- a base station 105 may facilitate the scheduling of resources for D2D communications.
- D2D communications may be carried out between UEs 115 without the involvement of a
- Base stations 105 may communicate with the core network 130 and with one another.
- base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., via an S1, N2, N3, or other interface) .
- Base stations 105 may communicate with one another over backhaul links 134 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) .
- the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
- the core network 130 may be an evolved packet core (EPC) , which may include at least one mobility management entity (MME) , at least one serving gateway (S-GW) , and at least one packet data network (PDN) gateway (P-GW) .
- the MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC.
- User IP packets may be transferred through the S-GW, which itself may be connected to the P-GW.
- the P-GW may provide IP address allocation as well as other functions.
- the P-GW may be connected to the network operators IP services.
- the operators IP services may include access to the Internet, Intranet (s) , an IP multimedia subsystem (IMS) , or a packet-switched (PS) streaming service.
- IMS
- At least some of the network devices may include subcomponents such as an access network entity, which may be an example of an access node controller (ANC) .
- Each access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, or a transmission/reception point (TRP) .
- TRP transmission/reception point
- various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 105) .
- Wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
- the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length.
- UHF waves may be blocked or redirected by buildings and environmental features. However, the waves may penetrate structures sufficiently for a macro cell to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter range (e.g., less than 100 km) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
- HF high frequency
- VHF very high frequency
- Wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band.
- SHF region includes bands such as the 5 GHz industrial, scientific, and medical (ISM) bands, which may be used opportunistically by devices that may be capable of tolerating interference from other users.
- ISM bands 5 GHz industrial, scientific, and medical bands
- Wireless communications system 100 may also operate in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band.
- EHF extremely high frequency
- wireless communications system 100 may support millimeter wave (mmW) communications between UEs 115 and base stations 105, and EHF antennas of the respective devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate use of antenna arrays within a UE 115.
- mmW millimeter wave
- the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. Techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
- Wireless communications system 100 may include operations by different network operating entities (e.g., network operators) , in which each network operator may share spectrum.
- a network operating entity may be configured to use an entirety of a designated shared spectrum for at least a period of time before another network operating entity uses the entirety of the designated shared spectrum for a different period of time.
- certain resources e.g., time
- a network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entirety of the shared spectrum.
- the network operating entity may also be allocated other time resources where the entity is given priority over other network operating entities to communicate using the shared spectrum.
- These time resources, prioritized for use by the network operating entity may be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize the resources. Additional time resources may be allocated for any network operator to use on an opportunistic basis.
- Access to the shared spectrum and the arbitration of time resources among different network operating entities may be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operators.
- wireless communications system 100 may use both licensed and unlicensed radio frequency spectrum bands.
- wireless communications system 100 may employ license assisted access (LAA) , LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (NR-U) , such as the 5 GHz ISM band.
- LAA license assisted access
- LTE-U LTE-unlicensed
- NR-U unlicensed band
- UE 115 and base station 105 of the wireless communications system 100 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) frequency spectrum.
- UEs 115 or base stations 105 may traditionally perform a medium-sensing procedure to contend for access to the frequency spectrum.
- UE 115 or base station 105 may perform a listen before talk (LBT) procedure such as a clear channel assessment (CCA) prior to communicating in order to determine whether the shared channel is available.
- LBT listen before talk
- CCA clear channel assessment
- a CCA may include an energy detection procedure to determine whether there are any other active transmissions on the shared channel. For example, a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that a channel is occupied. Specifically, signal power that is concentrated in a certain bandwidth and exceeds a predetermined noise floor may indicate another wireless transmitter.
- RSSI received signal strength indicator
- a CCA also may include message detection of specific sequences that indicate use of the channel. For example, another device may transmit a specific preamble prior to transmitting a data sequence.
- an LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on a channel and/or the acknowledge/negative-acknowledge (ACK/NACK) feedback for its own transmitted packets as a proxy for collisions.
- ACK/NACK acknowledge/negative-acknowledge
- a first category no LBT or CCA is applied to detect occupancy of the shared channel.
- a second category (CAT 2 LBT) , which may also be referred to as an abbreviated LBT, a single-shot LBT, or a 25- ⁇ s LBT, provides for the node to perform a CCA to detect energy above a predetermined threshold or detect a message or preamble occupying the shared channel.
- the CAT 2 LBT performs the CCA without using a random back-off operation, which results in its abbreviated length, relative to the next categories.
- a third category performs CCA to detect energy or messages on a shared channel, but also uses a random back-off and fixed contention window. Therefore, when the node initiates the CAT 3 LBT, it performs a first CCA to detect occupancy of the shared channel. If the shared channel is idle for the duration of the first CCA, the node may proceed to transmit. However, if the first CCA detects a signal occupying the shared channel, the node selects a random back-off based on the fixed contention window size and performs an extended CCA. If the shared channel is detected to be idle during the extended CCA and the random number has been decremented to 0, then the node may begin transmission on the shared channel.
- CAT 3 LBT performs CCA to detect energy or messages on a shared channel, but also uses a random back-off and fixed contention window. Therefore, when the node initiates the CAT 3 LBT, it performs a first CCA to detect occupancy of the shared channel. If the shared channel is idle for the duration of the first CCA, the no
- the node decrements the random number and performs another extended CCA.
- the node would continue performing extended CCA until the random number reaches 0. If the random number reaches 0 without any of the extended CCAs detecting channel occupancy, the node may then transmit on the shared channel. If at any of the extended CCA, the node detects channel occupancy, the node may re-select a new random back-off based on the fixed contention window size to begin the countdown again.
- a fourth category (CAT 4 LBT) , which may also be referred to as a full LBT procedure, performs the CCA with energy or message detection using a random back-off and variable contention window size.
- the sequence of CCA detection proceeds similarly to the process of the CAT 3 LBT, except that the contention window size is variable for the CAT 4 LBT procedure.
- base stations 105 and UEs 115 may be operated by the same or different network operating entities. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity. Requiring each base station 105 and UE 115 of different network operating entities to contend for shared resources may result in increased signaling overhead and communication latency.
- operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
- Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these.
- Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD) , time division duplexing (TDD) , or a combination of both.
- FDD frequency division duplexing
- TDD time division duplexing
- base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
- wireless communications system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115) , where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas.
- MIMO communications may employ multipath signal propagation to increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing.
- the multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas.
- Each of the multiple signals may be referred to as a separate spatial stream, and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams.
- Different spatial layers may be associated with different antenna ports used for channel measurement and reporting.
- MIMO techniques include single-user MIMO (SU-MIMO) where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) where multiple spatial layers are transmitted to multiple devices.
- SU-MIMO single-user MIMO
- MU-MIMO multiple-user MIMO
- Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or receive beam) along a spatial path between the transmitting device and the receiving device.
- Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
- the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying certain amplitude and phase offsets to signals carried via each of the antenna elements associated with the device.
- the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
- a base station 105 may use multiple antennas or antenna arrays to conduct beamforming operations for directional communications with a UE 115. For instance, some signals (e.g. synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station 105 multiple times in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
- some signals e.g. synchronization signals, reference signals, beam selection signals, or other control signals
- Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
- Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
- the beam direction associated with transmissions along a single beam direction may be determined based at least in in part on a signal that was transmitted in different beam directions.
- a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions, and the UE 115 may report to the base station 105 an indication of the signal it received with a highest signal quality, or an otherwise acceptable signal quality.
- a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) , or transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
- a receiving device may try multiple receive beams when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
- a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive beams or receive directions.
- a receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal) .
- the single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio, or otherwise acceptable signal quality based at least in part on listening according to multiple beam directions) .
- the antennas of a base station 105 or UE 115 may be located within one or more antenna arrays, which may support MIMO operations, or transmit or receive beamforming.
- one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
- antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
- a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
- a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
- UEs 115 and base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
- HARQ feedback is one technique of increasing the likelihood that data is received correctly over a communication link 125.
- HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) .
- FEC forward error correction
- ARQ automatic repeat request
- HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions) .
- a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot, while in other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
- the radio frames may be identified by a system frame number (SFN) ranging from 0 to 1023.
- SFN system frame number
- Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms.
- a subframe may be further divided into 2 slots each having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods.
- a subframe may be the smallest scheduling unit of the wireless communications system 100, and may be referred to as a transmission time interval (TTI) .
- TTI transmission time interval
- a smallest scheduling unit of the wireless communications system 100 may be shorter than a subframe or may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or in selected component carriers using sTTIs) .
- a slot may further be divided into multiple mini-slots containing one or more symbols.
- a symbol of a mini-slot or a mini-slot may be the smallest unit of scheduling.
- Each symbol may vary in duration depending on the subcarrier spacing or frequency band of operation, for example.
- some wireless communications systems may implement slot aggregation in which multiple slots or mini-slots are aggregated together and used for communication between a UE 115 and a base station 105.
- carrier refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over a communication link 125.
- a carrier of a communication link 125 may include a portion of a radio frequency spectrum band that is operated according to physical layer channels for a given radio access technology.
- Each physical layer channel may carry user data, control information, or other signaling.
- a carrier may be associated with a pre-defined frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) , and may be positioned according to a channel raster for discovery by UEs 115.
- E-UTRA evolved universal mobile telecommunication system terrestrial radio access
- E-UTRA absolute radio frequency channel number
- Carriers may be downlink or uplink (e.g., in an FDD mode) , or be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
- signal waveforms transmitted over a carrier may be made up of multiple sub-carriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
- MCM multi-carrier modulation
- OFDM orthogonal frequency division multiplexing
- DFT-S-OFDM discrete Fourier transform spread OFDM
- the organizational structure of the carriers may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR) .
- communications over a carrier may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding the user data.
- a carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc. ) and control signaling that coordinates operation for the carrier.
- acquisition signaling e.g., synchronization signals or system information, etc.
- control signaling that coordinates operation for the carrier.
- a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
- Physical channels may be multiplexed on a carrier according to various techniques.
- a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
- control information transmitted in a physical control channel may be distributed between different control regions in a cascaded manner (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces) .
- a carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100.
- the carrier bandwidth may be one of a number of predetermined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) .
- each served UE 115 may be configured for operating over portions or all of the carrier bandwidth.
- some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
- a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
- a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
- the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme) .
- the more resource elements that a UE 115 receives and the higher the order of the modulation scheme the higher the data rate may be for the UE 115.
- a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers) , and the use of multiple spatial layers may further increase the data rate for communications with a UE 115.
- a spatial resource e.g., spatial layers
- Devices of the wireless communications system 100 may have a hardware configuration that supports communications over a particular carrier bandwidth, or may be configurable to support communications over one of a set of carrier bandwidths.
- the wireless communications system 100 may include base stations 105 and/or UEs 115 that support simultaneous communications via carriers associated with more than one different carrier bandwidth.
- Wireless communications system 100 may support communication with a UE 115 on multiple cells or carriers, a feature which may be referred to as carrier aggregation or multi-carrier operation.
- a UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration.
- Carrier aggregation may be used with both FDD and TDD component carriers.
- wireless communications system 100 may utilize enhanced component carriers (eCCs) .
- eCC may be characterized by one or more features including wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or modified control channel configuration.
- an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have a suboptimal or non-ideal backhaul link) .
- An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum, such as NR-shared spectrum (NR-SS) ) .
- NR-SS NR-shared spectrum
- An eCC characterized by wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are not capable of monitoring the whole carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power) .
- an eCC may utilize a different symbol duration than other component carriers, which may include use of a reduced symbol duration as compared with symbol durations of the other component carriers.
- a shorter symbol duration may be associated with increased spacing between adjacent subcarriers.
- a device such as a UE 115 or base station 105, utilizing eCCs may transmit wideband signals (e.g., according to frequency channel or carrier bandwidths of 20, 40, 60, 80 MHz, etc. ) at reduced symbol durations (e.g., 16.67 microseconds) .
- a TTI in eCC may consist of one or multiple symbol periods. In some cases, the TTI duration (that is, the number of symbol periods in a TTI) may be variable.
- Wireless communications system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, among others.
- the flexibility of eCC symbol duration and subcarrier spacing may allow for the use of eCC across multiple spectrums.
- NR shared spectrum may increase spectrum utilization and spectral efficiency, specifically through dynamic vertical (e.g., across the frequency domain) and horizontal (e.g., across the time domain) sharing of resources.
- FIG. 2 shows a block diagram of a design of a base station 105 and a UE 115, which may be one of the base station and one of the UEs in FIG. 1.
- 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 the PBCH, PCFICH, PHICH, PDCCH, EPDCCH, MPDCCH etc.
- the data may be for the PDSCH, etc.
- the transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
- the transmit processor 220 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal.
- a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a through 232t.
- Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
- Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
- Downlink signals from modulators 232a through 232t may be transmitted via the antennas 234a through 234t, respectively.
- the antennas 252a through 252r may receive the downlink signals from the base station 105 and may provide received signals to the demodulators (DEMODs) 254a through 254r, respectively.
- Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
- Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
- a MIMO detector 256 may obtain received symbols from all the demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
- a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to a data sink 260, and provide decoded control information to a controller/processor 280.
- a transmit processor 264 may receive and process data (e.g., for the PUSCH) from a data source 262 and control information (e.g., for the PUCCH) from the controller/processor 280.
- the transmit processor 264 may also generate reference symbols for a reference signal.
- the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators 254a through 254r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 105.
- the uplink signals from the UE 115 may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 115.
- the processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
- the controllers/processors 240 and 280 may direct the operation at the base station 105 and the UE 115, respectively.
- the controller/processor 240 and/or other processors and modules at the base station 105 may perform or direct the execution of various processes for the techniques described herein.
- the controllers/processor 280 and/or other processors and modules at the UE 115 may also perform or direct the execution of the functional blocks illustrated in FIGs. 4A –4C, and/or other processes for the techniques described herein.
- the memories 242 and 282 may store data and program codes for the base station 105 and the UE 115, respectively.
- a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
- a UE may report information on the state of the communication channel with a serving base station. This channel state information (CSI) reporting may occur periodically, aperiodically, or semi-persistently. Additionally, a CSI report may include information such as a CSI-reference signal (CSI-RS) resource indicator (CRI) , which identifies a particular resource or beam of CSI-RS, a rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) , among others.
- CSI-RS CSI-reference signal
- CRI rank indicator
- PMI precoding matrix indicator
- CQI channel quality indicator
- the current standards for CSI report configuration allows for one to three settings: a first setting that includes a channel measurement resource (CMR) setting, a second setting that includes the CMR setting and either a CSI-interference measurement (CSI-IM) setting or a non-zero power interference measurement resource (NZP-IMR) setting, or a third setting that includes the CMR, CSI-IM, and NZP-IMR settings.
- Each setting includes a number of candidate resource sets, in which each candidate resource set includes one or more resources that may correspond to one or more TRPs.
- a transmission configuration indication (TCI) state associated with the resource may indicate, among other things, whether the resource is from the same or different TRP. Where resources share the same TCI state, such resources may be associated with the same TRP, while the resources with different TCI states may be associated with different TRPs.
- the UE may select one CMR resource out of N resources.
- the selected CMR creates an active set corresponding to one or more resources.
- Each resource may be associated with a single CSI-IM resource, if the CSI-IM setting is included in the CSI reporting configuration.
- Each CMR resource and each CSI-IM resource may be associated with a NZP IMR resource set comprising multiple NZP IMR resources, if all three settings are configured. Where only the CMR and NZP IMR settings are configured, each CMR resource would be associated with a NZP IMR resource set comprising multiple NZP IMR resources.
- multiple TRP (mTRP) transmission schemes include single downlink control information (DCI) -scheduled schemes and multi-DCI-scheduled schemes.
- DCI downlink control information
- Single DCI-scheduled schemes may be applicable to operations including an ideal backhaul.
- a first TRP transmits the DCI which schedules the transmissions from both TRPs.
- Such single DCI-scheduled schemes include spatial division multiplex (SDM) schemes (e.g., non-coherent joint transmission (NCJT) ) , where a first set of layers may be transmitted from a first TRP and a second set of layers transmitted from a second TRP.
- SDM spatial division multiplex
- NJT non-coherent joint transmission
- the resulting transmission may include the same frequency domain resource assignment (FDRA) and time domain resource assignment (TDRA) .
- FDRA frequency domain resource assignment
- TDRA time domain resource assignment
- Single DCI-scheduled schemes also include frequency division multiplex (FDM) schemes, which may include the same rank and same codeword transmitted repeatedly from the two TRPs with different redundancy version (RV) and different FDRA across the two TRPs.
- FDM frequency division multiplex
- TDM time division multiplex
- Multi-DCI-scheduled schemes may be applicable to ideal or non-ideal backhauls.
- each TRP transmits its own DCI that schedules its own transmission to the UE.
- Each DCI schedules an individual transmission (e.g., PDSCH) similar to a carrier aggregation (CA) framework.
- Resource allocation for such multi-DCI-schedules schemes can be overlapped, non-overlapped or partially overlapped.
- FIGs. 3A-3C are block diagrams illustrating CSI reporting configurations for sTRP and mTRP transmissions where the CSI is either associated to a single resource with a TCI state for sTRP transmissions or a pair of CSI-reference signal (CSI-RS) resources with different TCI states for mTRP transmissions.
- FIG. 3A illustrates a first sTRP scenario, in which UE 115 selects, via CRI, the beam/resource for transmission from TRP 0.
- the CSI-RS resource for channel measurement in such resource selection corresponds to n1
- the CSI-IM resource for interference measurement corresponds to m1, which includes the interference attributed to transmissions from both TRP 1 and TRP 105, which is outside of the measurement set.
- FIG. 3B illustrates a second sTRP scenario, in which UE 115 selects, via CRI, the beam/resource for transmission from TRP 1.
- the CSI-RS resource for channel measurement in such resource selection corresponds to n2
- the CSI-IM resource for interference measurement corresponds to m2, which includes the interference attributed to transmissions from both TRP 0 and TRP 105.
- FIG. 3C illustrates a first mTRP scenario, in which UE 115 selects, via CRI, the beams/resources for transmission from both TRP 0 and TRP 1.
- the CSI-RS resources for channel measurement in such mTRP resource selection corresponds to n1 and n2, and the CSI-IM resource for interference measurement corresponds to m3.
- some of the resources are mapped to single resource CSI hypotheses, which are associated with sTRP transmissions, and some resources are paired and mapped to multi-resource CSI hypotheses, which are associated with mTRP transmissions.
- M1 single resource CSI hypotheses in a one-to-one association with M1 resources
- M2 multi-source CSI hypotheses that correspond to M2 resource-pairs.
- the UE may report the best single resource CSI hypothesis out of the M1 single resource CSI hypotheses for sTRP transmissions and the best multi-resource CSI hypothesis out of the M2 multi-resource CSI hypothesis for mTRP transmissions, or, in the second alternative, the UE may report best CSI hypothesis out of all single source CSI hypotheses and multi-resource CSI hypotheses (e.g., 1 out of M1+M2) . Issues may arise in the first alternative CSI reporting, as it consumes large CSI reporting overhead (e.g., 3 PMIs are reported, 1 for the single resource CSI hypothesis, and 2 for multi-resource CSI hypothesis) . Additionally, issues may arise in the second alternative CSI reporting, as the UE may prefer reporting the multi-resource CSI hypothesis, as channels from mTRP transmissions generally result in better diversity and transmission from multiple TRPs results in a higher power.
- FIG. 4A is a block diagram illustrating example blocks executed by a UE to implement one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIGs. 2 and 6.
- FIG. 6 is a block diagram illustrating UE 115 configured according to one aspect of the present disclosure.
- UE 115 includes the structure, hardware, and components as illustrated for UE 115 of FIG. 2.
- controller/processor 280 which operates to execute logic or computer instructions stored in memory 282, as well as controlling the components of UE 115 that provide the features and functionality of UE 115.
- UE 115 under control of controller/processor 280, transmits and receives signals via wireless radios 600a-r and antennas 252a-r.
- Wireless radios 600a-r includes various components and hardware, as illustrated in FIG. 2 for UE 115, including modulator/demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266.
- a UE determines to prepare a CSI report according to a predetermined CSI report configuration.
- a UE such as UE 115, receives a CSI report configuration via antennas 252a-r and wireless radios 600a-r, which may configure UE 115 for performing channel measurements and reporting the state of the communication channel via CSI reports to serving base stations, whether on a periodic, aperiodic, or semi-persistent basis.
- UE 115 stores such configuration in memory 282 at CSI report configuration 601. In preparation for CSI reporting, the UE measures the channels to determine the various CSI report content, including CRI, RI, PMI, CQI, and the like.
- UE 115 under control of controller/processor 280, executes measurement logic 602, in memory 282.
- the steps and instructions executed by controller/processor 280 of measurement logic 602 enables the functionality and capability for UE 115 to measure such channel qualities (referred to herein as the “execution environment” of measurement logic 602) .
- the CSI configuration may identify when UE 115 is to perform such measurement and reporting.
- a UE receives the CSI configuration via RRC messaging, in which the configuration comprises the periodicity and offset of CSI reporting. The UE may then start to report the CSI accordingly once the RRC connection is established.
- the UE also receives the CSI configuration via RRC messaging, the configuration comprises the periodicity and offset of CSI reporting. If the semi-persistent (SP) -CSI is to transmit on PUCCH, the UE will further receive a medium access control control element (MAC CE) to activate the SP-CSI and then starts the SP-CSI after receiving the activation, until receiving another MAC CE to deactivate the SP-CSI.
- SP semi-persistent
- MAC CE medium access control control element
- the UE will further receive a DCI to trigger the SP-CSI, after which the UE starts the SP-CSI until receiving another DCI to deactivate the SP-CSI.
- the UE receive the CSI configuration via RRC messaging, the UE will then receive a DCI to trigger the aperiodic (A) -CSI. The UE will report the A-CSI after receiving the triggering.
- the UE determines a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes either a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both.
- UE 115 may include either a single resource CSI hypothesis, a multi-resource CSI hypothesis, or both within the CSI report. Under control of controller/processor 280, UE 115 executes CSI hypothetical type logic 603, stored in memory 282.
- UE 115 within the execution environment of CSI hypothetical type logic 603, may determine which CSI hypothesis to report by comparing a relationship between the single resource and multi-resource CQI indications against one or more thresholds.
- the CQI indications may be the CQI index value of the single resource CQI with respect to the multi-resource CQI or the associated spectral efficiency of the single resource transmissions with respect to the multi-resource transmissions.
- Such one or more threshold values may be either configured via network signaling or predefined in the specification. When configured by network signaling, such signaling may include radio resource control (RRC) signaling in a CSI report configuration, a medium access control -control element (MAC CE) , or DCI.
- RRC radio resource control
- MAC CE medium access control -control element
- the UE transmits a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI.
- the first CSI report part determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI.
- CSI-1 includes an indication of the CSI hypothesis type that is being reported. Such indication will be reported to the serving base station whether the second part of the CSI report will include a single resource PMI, a multi-resource PMI, or both, in addition to the resources on which such PMI will be transmitted. UE 115 will then transmit the first part of the CSI report (CSI-1) via wireless radios 600a-r and antennas 252a-r.
- the UE transmits a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one PMI.
- CSI-2 the second party of the CSI report
- the PMI will depend on what CSI hypothesis type has been selected by the UE.
- CSI-2 may include a single PMI, when UE 115 selects a single resource CSI hypothesis, a multi-resource PMI, when the UE selects a multi-resource CSI hypothesis, or both.
- UE 115 transmits CSI-2 via wireless radios 600a-r and antennas 252a-r.
- FIG. 4B is a block diagram illustrating example blocks executed by a UE to determine a CSI hypothesis type as described at block 401 of FIG. 4A, according to one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIGs. 2 and 6.
- the UE determines a comparison of a CQI relationship of a single source CQI indication of the single source CSI hypothesis and a multi-source CQI indication of the multi-source CSI hypothesis against one or more threshold values.
- UE 115 will determine the comparison of the CQI relationship against the one or more threshold values.
- UE 115 may compare the CQI relationship against a single threshold value.
- the CQI relationship may be implemented as the CQI index values or as the percentage values of spectral efficiency (SE) corresponding to the CQI index values.
- SE spectral efficiency
- UE 115 may select either a single resource CSI hypothesis or both. There can also be multiple comparisons using the single threshold value, such as:
- the multi-resource CSI hypothesis is selected when the threshold comparison of equations (1a) or (1b) is satisfied
- the single resource CSI hypothesis is selected when the threshold comparison of equations (2a) or (2b) is satisfied, and both CSI hypotheses are selected otherwise.
- a second optional aspect of the present disclosure may compare the CQI relationship against multiple threshold values, such as:
- the multi-resource CSI hypothesis is selected when the threshold1 comparison of equations (3a) or (3b) is satisfied
- the single resource CSI hypothesis is selected when the threshold2 comparison of equations (4a) or (4b) is satisfied, and both CSI hypotheses are selected otherwise.
- the UE selects the CSI hypothesis type based on a result of the comparison.
- the selection of the CSI hypothesis type by UE 115, within the execution environment of CSI hypothetical type logic 603, may be indicated by the result of the comparison of the CQI indication against the one or more threshold values.
- FIG. 4C is a block diagram illustrating example blocks executed by a base station to implement one aspect of the present disclosure.
- a base station On the base station side, as a base station receives a first part of the CSI report, it may identify the CSI hypothesis type selected by a served UE. The example blocks will also be described with respect to base station 105 as illustrated in FIGs. 2 and 7.
- FIG. 7 is a block diagram illustrating base station 105 configured according to one aspect of the present disclosure.
- Base station 105 includes the structure, hardware, and components as illustrated for base station 105 of FIG. 2.
- base station 105 includes controller/processor 240, which operates to execute logic or computer instructions stored in memory 242, as well as controlling the components of base station 105 that provide the features and functionality of base station 105.
- Base station 105 under control of controller/processor 240, transmits and receives signals via wireless radios 700a-t and antennas 234a-t.
- Wireless radios 700a-t includes various components and hardware, as illustrated in FIG. 2 for base station 105, including modulator/demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230.
- a base station receives a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI.
- Base station 105 under control of controller/processor 240, executes CSI reporting 701 and CSI hypothetical type logic 702, stored in memory 242. Within the execution environments of CSI reporting 701 and CSI hypothetical type logic 702, base station 105 receives the first CSI report part (CSI-1) via antennas 234a-t and wireless radios 700a-t.
- base station 105 uses the indication of the CSI hypothesis type to determine the CSI hypothesis type selected by the UE and a resulting one or more PMI that would be included in the second part of the CSI report along with the resources used to transmit the one or more PMI.
- the base station determines, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type.
- base station 105 uses the indication of the CSI hypothesis type to determine the CSI hypothesis type selected by the UE and a resulting one or more PMI that would be included in the second part of the CSI report along with the resources used to transmit the one or more PMI.
- the base station receives the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- base station 105 is able to determine the CSI hypothesis type and corresponding PMI expected in the second part of the CSI report and the resources on which the PMI is transmitted, base station 105, within the execution environment of CSI hypothetical type logic 702, looks to those identified resources, received via antennas 234a-t and wireless radios 700a-t, to identify the expected at least one PMI in the second part of the CSI report.
- FIG. 5 is a call flow diagram illustrating single and multi-resource CSI reporting between UE 115 and TRP0 and TRP1 according to aspects of the present disclosure.
- TRP0 and TRP1 are within a measurement set of base stations in communication with UE 115.
- UE 115 receives CSI report configuration message 500, which includes a set of configuration parameters for UE 115 to conduct CSI reporting.
- CSI report configuration message 500 which includes a set of configuration parameters for UE 115 to conduct CSI reporting.
- UE 115 performs channel measurements 501, which measures channel quality and channel characteristics for communications between UE 115 and both TRP0 and TRP1.
- Channel measurements may be conducted by UE 115 based on reference signals or other signaling received from TRP0 and TRP1 or by measuring the channel during zero power interference management resources.
- UE 115 may determine the CSI hypothesis type that will be reported in the next CSI report.
- UE 115 compares a single resource and multi-resource CQI relationship to one or more thresholds.
- a first aspect may employ one or more threshold values to determine whether to report a single source CSI hypothesis, a multi-source CSI hypothesis, or both.
- a single threshold value may be implemented, such that, when CQI (multiple resources of mTRP transmissions) –CQI (single resource of sTRP transmissions) > threshold1, UE 115 reports the best multi-source CSI hypothesis.
- UE 115 reports either a single source CSI hypothesis or both.
- whether UE 115 reports the single resource CSI hypothesis or both may be determined either according to network configuration received via a CSI configuration message, such as CSI report configuration message 500 or other such configuration message or according to a predefined standard.
- a single threshold value may be used in comparison to different relationships of the CQI indication for the multiple resources of the mTRP transmissions and the single resource of the sTRP transmissions.
- the second optional aspect provides that when CQI (multiple resources of mTRP transmissions) –CQI (single resource of sTRP transmissions) > threshold1, then the UE may report the multi-resource CSI hypothesis, or when CQI (single resource of sTRP transmissions) –CQI (multi-resource of mTRP transmissions) > threshold1, then UE 115 may select to report the single resource CSI hypothesis. Otherwise, UE 115 may select to report both the single resource CSI hypothesis and the multi-resource CSI hypothesis.
- multiple threshold values may be implemented, such that, when CQI (multi-resource of mTRP transmissions) –CQI (single resource of sTRP transmissions) > threshold1, then UE 115 may select to report the multi-resource CSI hypothesis, and when CQI (single resource of sTRP transmission) –CQI (multi-resource of mTRP transmissions) > threshold2, then UE 115 may select to report the single source CSI hypothesis. Otherwise, UE 115 may report both the single source CSI hypothesis and the multi-source CSI hypothesis.
- threshold values used in the comparison at 502 may be configured by network signaling or predefined at UE 115.
- a base station serving UE 115 such as TRP0 and TRP1 may signal the one or more threshold values via RRC signaling in a CSI report configuration, such as CSI report configuration 500, via a MAC CE (not shown) , or DCI (not shown) .
- the CQI indication may include CQI index values, such that the threshold value may include integer values (e.g., 1 or 2) .
- the CQI indication may also be represented as percentage values of the spectral efficiency.
- the first optional aspect described above may use a comparison of SE (multi-resource of mTRP transmissions) /SE (single resource of sTRP transmissions) > threshold1.
- the comparison of the second optional aspect described above may include SE (multi-resource of mTRP transmissions) /SE (single resource of sTRP transmissions) > threshold1 and SE (single resource of sTRP transmissions) /SE (multi-resource of mTRP transmissions) > threshold1.
- the comparison of the third optional aspect described above may include SE (multi-resource of mTRP transmissions) /SE (single resource of sTRP transmissions) > threshold1 and SE (single resource of sTRP transmissions) /SE (multi-resource of mTRP transmissions) > threshold2. Additionally, all such comparisons at 502, whether the CQI indications are represented by index integers or by spectral efficiency percentages, are based on a wideband CQI or wideband spectral efficiency average across all frequency bands.
- UE 115 may report two CRIs (one indicating a resource used for CSI measured using a single resource of sTRP transmission, referred to herein as a single resource CRI, and one indicating a resource pair used for CSI measured using a resource-pair of mTRP transmissions, referred to herein as a multi-resource CRI) , two RIs (one indicating the rank measured using the resource indicated by the single resource CRI, referred to herein as a single resource RI, the other indicating the rank-pair measured using the resource-pair indicated by the multi-resource CRI, referred to herein as a multi-source RI) , three PMIs (one associated with the single resource RI and the resource indicated by the single resource CRI, referred to herein as a single resource PMI, and the other two are a PMIs (one associated with the single resource RI and the resource indicated by the single resource CRI, referred to herein as a single resource PMI, and the other two are
- UE 115 may report one CRI (either for single resource CSI hypothesis, or for multi-resource CSI hypotheses) , one RI (either for single resource CSI hypothesis, or for multi-resource CSI hypotheses) , one PMI (for single resource CSI hypothesis) or two PMIs (for multi-resource CSI hypothesis) , and one CQI (either for single resource CSI hypothesis, or for multi-resource CSI hypotheses) .
- UE 115 would transmit the CSI report in two separate parts and transmissions: CSI-1 and CSI-2.
- CSI-1 has a fixed payload and includes the CRI and RI that will be used to determine the payload of CSI-2.
- CSI-2 includes the remaining CSI report contents including the full PMI.
- UE 115 transmits CSI-1 503, which includes the CRI and RI payload along with an indication of the CSI hypothesis type selected by UE 115.
- CSI-1 503 if, at 502, UE 115 determines a CSI hypothesis type of either a single resource CSI hypothesis, or a multi-resource CSI hypothesis, or both, a first optional implementation may use an additional indication in CSI-1.
- a mode-indicator within CSI-1 503 may indicate whether CSI-2 504 contains a single resource CSI hypothesis, or a multi-resource hypothesis, or both.
- UE 115 would report two CRIs (the single resource CRI and the multi-source CRI) , and two RIs in CSI-1 503.
- a base station such as TRP0 and/or TRP1
- CSI-2 504 includes a single resource PMI for a single resource sTRP transmission, a multi-resource PMI for multi-resource mTRP transmissions, or both based on the value of the mode-indicator.
- the CRI field may be reused by providing an additional codepoint for the CRI.
- UE 115 reports two CRIs, a first for a single resource CRI for single resource CSI hypothesis with log2 (M1+1) bits, and a second for multi-resource CSI hypothesis with log2 (M2+1) bits.
- the single resource CRI report codepoint of M1 would indicate CSI-2 504 includes a single resource PMI along with the resource selected for reporting the single resource PMI, while a codepoint of M1+1 would indicate CSI-2 504 does not include the single resource PMI.
- the second CRI report codepoint of M2 would indicate that CSI-2 504 includes a multi-resource PMI along with identification of the resource selected for reporting the multi-resource PMI, while a codepoint of M2+1 would indicate CSI-2 504 does not include the multi-resource PMI.
- the RI field may be reused by providing an additional codepoint for the RI.
- UE 115 would report two RIs, the first, single resource RI for the single resource CSI hypothesis with log2 (max_rank_sTRP+1) bits, where max_rank_sTRP represents the maximum allowable rank associated with the single resources to be reported by UE 115, and the second, multi-resource RI for the multi-resource CSI hypothesis with log2 (#RankPair+1) bits, where #RankPair represents the total number of allowable rank pairs associated with the multiple resources, e.g., (1+1) , (1+2) , (2+1) , (2+2) , etc.
- one joint CRI may be configured to indicate whether UE 115 reports the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both, and in each case which CSI hypotheses are selected.
- the joint CRI may include log2 (M1*M2+M1+M2) bits, where codepoints 1.. M1 would indicate that CSI-2 504 includes the single resource CSI hypothesis, codepoints M1+1...M1+M2, would indicate that CSI-2 504 includes the multi-resource CSI hypothesis, and codepoints M1+M2+1...M1+M1+M1*M2, would indicate that CSI-2 504 includes both.
- CSI-2 504 includes the PMI according to the CSI hypothesis type selected by UE 115, along with the CQI and any other CSI report information.
- TRP0 and TRP1 receive CSI-1 503, it identifies, via the additional indicator of the selected CSI hypothesis type, will know whether the PMI of CSI-2 504 is the single resource PMI, the multi-resource PMI, or both, in additional to the resources on which the PMI is transmitted.
- the functional blocks and modules in FIGs. 4A –4C may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.
- Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, application, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and/or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise.
- a first aspect of wireless communication may include determining, by a UE, to prepare a CSI report according to a predetermined CSI report configuration; determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both; transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes
- the indication includes a mode indicator that explicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes the mode indicator, a single resource CRI, a multi-resource CRI, a single resource RI, and a multi-resource RI
- the second CSI report part includes one of: an single resource PMI and two multi-resource PMIs associated with a first value of the mode indicator indicating the CSI hypothesis type is both, the single resource PMI associated with a second value of the mode indicator indicating the CSI hypothesis type is the single resource CSI hypothesis, and the multi-resource PMI associated with a third value of the mode indicator indicating the CSI hypothesis type is the multi-resource CSI hypothesis.
- the indication includes an additional codepoint in a CRI field that implicitly identifies the CSI hypothesis type in the second CSI report part is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a CSI-RS resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and multiple CSI-RS resources the multi-resource PMI is associated with, and wherein the second
- the indication includes an additional codepoint in an RI field that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and ranks of the multi-resource PMI, and wherein the second CSI report part includes one of: the single resource PMI
- the indication includes a joint CRI indicator that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the joint CRI indication being the first joint CRI value, the multi-resource PMI associated with the joint CRI indication being the second joint CRI value, and the single resource PMI associated with the joint CRI indication being the third value.
- the determining the CSI hypothesis type includes determining a comparison of a CQI relationship of a single resource CQI indication of the single resource CSI hypothesis and a multi-resource CQI indication of the multi-resource CSI hypothesis against one or more threshold values; and selecting the CSI hypothesis type based on a result of the comparison.
- the one or more threshold values includes a single threshold value
- the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value
- the selecting the CSI hypothesis type includes one of: selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; and selecting one of the single resource CSI hypothesis or both the single resource CSI hypothesis and the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- a CSI reporting indicator identifying one of the single resource CSI hypothesis or both for reporting, wherein the one of the single resource CSI hypothesis or both is selected according to the CSI reporting indicator in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- the CSI reporting indicator is obtained via one of: a predefined configuration at the UE or a system information message received from a neighboring base station.
- the one or more threshold values includes a single threshold value
- the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the single threshold value
- the selecting the CSI hypothesis type includes one of: selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the single threshold value selecting both in response to the comparison failing to satisfy the single threshold
- the one or more threshold values includes a first threshold value and a second threshold value
- the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the first threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the second threshold value
- the selecting the CSI hypothesis type includes one of: selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the first threshold value; selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the second threshold value; selecting both in response to the
- the multi-resource CQI indication and the single resource CQI indication include one of: a CQI index, or a spectral efficiency associated with the CQI index.
- a nineteenth aspect of wireless communication includes receiving, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI; determining, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type; and receiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- the CSI hypothesis type includes one of: a single resource CSI hypothesis type, a multi-resource CSI hypothesis type, or both.
- the indication of the CSI hypothesis type includes a mode indicator identifying the CSI hypothesis type
- the PMI type to be included in the second CSI report part corresponds to the CSI hypothesis type identified by the mode indicator
- the indication of the CSI hypothesis type includes an additional codepoint of a CRI field of the first CSI report part
- the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a PMI resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI
- the indication of the CSI hypothesis type includes an additional codepoint of a RI field of the first CSI report part
- the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the
- the indication of the CSI hypothesis type includes an additional codepoint of a joint CRI of the first CSI report part
- the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both.
- a twenty-fifth aspect configured for wireless communication includes means for determining, by a UE, to prepare a CSI report according to a predetermined CSI report configuration; means for determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both; means for transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI; and means for transmitting, by the UE, a second CSI report part of the CSI report, wherein the second
- the indication includes a mode indicator that explicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes the mode indicator, a single resource CRI, a multi-resource CRI, a single resource RI, and a multi-resource RI
- the second CSI report part includes one of: a single resource PMI and two multi-resource PMIs associated with a first value of the mode indicator indicating the CSI hypothesis type is both, the single resource PMI associated with a second value of the mode indicator indicating the CSI hypothesis type is the single resource CSI hypothesis, and the multi-resource PMI associated with a third value of the mode indicator indicating the CSI hypothesis type is the multi-resource CSI hypothesis.
- the indication includes an additional codepoint in a CRI field that implicitly identifies the CSI hypothesis type in the second CSI report part is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a CSI-RS resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and multiple CSI-RS resources the multi-resource
- the indication includes an additional codepoint in an RI field that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and ranks of the multi-resource PMI, and wherein the second CSI report part
- the indication includes a joint CRI indicator that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the joint CRI indication being the first joint CRI value, the multi-resource PMI associated with the joint CRI indication being the second joint CRI value, and the single resource PMI associated with the joint CRI indication being the third value.
- the means for determining the CSI hypothesis type includes means for determining a comparison of a channel quality indicator (CQI) relationship of a single resource CQI indication of the single resource CSI hypothesis and a multi-resource CQI indication of the multi-resource CSI hypothesis against one or more threshold values; and means for selecting the CSI hypothesis type based on a result of the comparison.
- CQI channel quality indicator
- the one or more threshold values includes a single threshold value
- the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value
- the means for selecting the CSI hypothesis type includes one of: means for selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; means for selecting one of the single resource CSI hypothesis or both the single resource CSI hypothesis and the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- a thirty-sixth aspect alone or in combination with one or more of the twenty-fifth aspect through the thirty-fifth aspect, further including means for obtaining a CSI reporting indicator identifying one of the single resource CSI hypothesis or both for reporting, wherein the one of the single resource CSI hypothesis or both is selected according to the CSI reporting indicator in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- the CSI reporting indicator is obtained via one of: a predefined configuration at the UE or a system information message received from a neighboring base station.
- the one or more threshold values includes a single threshold value
- the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the single threshold value
- the means for selecting the CSI hypothesis type includes one of: means for selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; means for selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the
- the one or more threshold values includes a first threshold value and a second threshold value
- the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the first threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the second threshold value
- the means for selecting the CSI hypothesis type includes one of: means for selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the first threshold value; means for selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-re
- a fortieth aspect alone or in combination with one or more of the twenty-fifth aspect through the thirty-ninth aspect, further including means for obtaining, by the UE, the one or more threshold values via one of: one or more predefined threshold values at the UE or a CSI reporting configuration message received via a neighboring base station.
- the multi-resource CQI indication and the single resource CQI indication include one of: a CQI index, or a spectral efficiency associated with the CQI index.
- a forty-second aspect alone or in combination with one or more of the twenty-fifth aspect through the forty-first aspect, wherein the comparison compares the CQI relationship of a wideband CQI indication against one or more threshold values across all frequency bands.
- a forty-third aspect configured for wireless communication includes means for receiving, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI; means for determining, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type; and means for receiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- the CSI hypothesis type includes one of: a single resource CSI hypothesis type, a multi-resource CSI hypothesis type, or both.
- the indication of the CSI hypothesis type includes a mode indicator identifying the CSI hypothesis type
- the PMI type to be included in the second CSI report part corresponds to the CSI hypothesis type identified by the mode indicator
- the indication of the CSI hypothesis type includes an additional codepoint of a CRI field of the first CSI report part
- the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a PMI resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a
- the indication of the CSI hypothesis type includes an additional codepoint of a RI field of the first CSI report part
- the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource
- the indication of the CSI hypothesis type includes an additional codepoint of a joint CRI of the first CSI report part
- the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both.
- a forty-ninth aspect including a non-transitory computer-readable medium having program code recorded thereon, the program code includes program code executable by a computer for causing the computer to determine, by a UE, to prepare a CSI report according to a predetermined CSI report configuration; program code executable by the computer for causing the computer to determine, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both; program code executable by the computer for causing the computer to transmit, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication
- the indication includes a mode indicator that explicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes the mode indicator, a single resource CRI, a multi-resource CRI, a single resource RI, and a multi-resource RI
- the second CSI report part includes one of: an single resource PMI and two multi-resource PMIs associated with a first value of the mode indicator indicating the CSI hypothesis type is both, the single resource PMI associated with a second value of the mode indicator indicating the CSI hypothesis type is the single resource CSI hypothesis, and the multi-resource PMI associated with a third value of the mode indicator indicating the CSI hypothesis type is the multi-resource CSI hypothesis.
- the indication includes an additional codepoint in a CRI field that implicitly identifies the CSI hypothesis type in the second CSI report part is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a CSI-RS resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and multiple CSI-RS resources the multi-resource PMI is
- the indication includes an additional codepoint in an RI field that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and ranks of the multi-resource PMI, and wherein the second CSI
- the indication includes a joint CRI indicator that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the joint CRI indication being the first joint CRI value, the multi-resource PMI associated with the joint CRI indication being the second joint CRI value, and the single resource PMI associated with the joint CRI indication being the third value.
- the program code executable by the computer for causing the computer to determine the CSI hypothesis type includes: program code executable by the computer for causing the computer to determine a comparison of a CQI relationship of a single resource CQI indication of the single resource CSI hypothesis and a multi-resource CQI indication of the multi-resource CSI hypothesis against one or more threshold values; and program code executable by the computer for causing the computer to select the CSI hypothesis type based on a result of the comparison.
- the one or more threshold values includes a single threshold value
- the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value
- the program code executable by the computer for causing the computer to select the CSI hypothesis type includes one of: program code executable by the computer for causing the computer to select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; program code executable by the computer for causing the computer to select one of the single resource CSI hypothesis or both the single resource CSI hypothesis and the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQ
- a sixtieth aspect alone or in combination with one or more of the forty-ninth aspect through the fifty-ninth aspect, further including: program code executable by the computer for causing the computer to obtain a CSI reporting indicator identifying one of the single resource CSI hypothesis or both for reporting, wherein the one of the single resource CSI hypothesis or both is selected according to the CSI reporting indicator in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- the CSI reporting indicator is obtained via one of: a predefined configuration at the UE or a system information message received from a neighboring base station.
- the one or more threshold values includes a single threshold value
- the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the single threshold value
- the program code executable by the computer for causing the computer to select the CSI hypothesis type includes one of: program code executable by the computer for causing the computer to select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; program code executable by the computer for causing the computer to select the single resource CSI hypothesis in response to the single resource CQI indication
- the one or more threshold values includes a first threshold value and a second threshold value
- the comparison includes: the multi- resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the first threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the second threshold value
- the program code executable by the computer for causing the computer to select the CSI hypothesis type includes one of: program code executable by the computer for causing the computer to select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the first threshold value; program code executable by the computer for causing the computer to select the single resource CSI hypothesis in response to the single
- a sixty-fourth aspect alone or in combination with one or more of the forty-ninth aspect through the sixty-third aspect, further including program code executable by the computer for causing the computer to obtain, by the UE, the one or more threshold values via one of: one or more predefined threshold values at the UE or a CSI reporting configuration message received via a neighboring base station.
- the multi-resource CQI indication and the single resource CQI indication include one of: a CQI index, or a spectral efficiency associated with the CQI index.
- a sixty-sixth aspect alone or in combination with one or more of the forty-ninth aspect through the sixty-fifth aspect, wherein the comparison compares the CQI relationship of a wideband CQI indication against one or more threshold values across all frequency bands.
- a sixty-seventh aspect including non-transitory computer-readable medium having program code recorded thereon includes program code executable by a computer for causing the computer to receive, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI; program code executable by the computer for causing the computer to determine, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type; and program code executable by the computer for causing the computer to receive, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- the CSI hypothesis type includes one of: a single resource CSI hypothesis type, a multi-resource CSI hypothesis type, or both.
- the indication of the CSI hypothesis type includes a mode indicator identifying the CSI hypothesis type
- the PMI type to be included in the second CSI report part corresponds to the CSI hypothesis type identified by the mode indicator
- the indication of the CSI hypothesis type includes an additional codepoint of a CRI field of the first CSI report part
- the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a PMI resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies
- the indication of the CSI hypothesis type includes an additional codepoint of a RI field of the first CSI report part
- the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-
- the indication of the CSI hypothesis type includes an additional codepoint of a joint CRI of the first CSI report part
- the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both.
- DSP digital signal processor
- ASIC application specific integrated circuit
- FPGA field programmable gate array
- a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
- a processor may also be implemented as a combination of computing devices, e.g., 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.
- a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
- An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
- the storage medium may be integral to the processor.
- the processor and the storage medium may reside in an ASIC.
- the ASIC may reside in a user terminal.
- the processor and the storage medium may reside as discrete components in a user terminal.
- the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
- Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general purpose or special purpose computer.
- such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
- a connection may be properly termed a computer-readable medium.
- the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL) , then the coaxial cable, fiber optic cable, twisted pair, or DSL, are included in the definition of medium.
- DSL digital subscriber line
- Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
- the term “and/or, ” when used in a list of two or more items means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
- the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.
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Abstract
User equipment (UE) -determined single transmission-reception point (sTRP) single resource and multi-transmission-reception point (mTRP) multi-resource channel state information (CSI) reporting is disclosed. When the UE prepares for CSI reporting, it may determine to report a CSI hypothesis type, including a single resource CSI hypothesis, a multi-resource CSI hypothesis, or both. Such a determination may be made by the UE through comparison of the channel quality indicator (CQI) of the single and multiple resources against one or more thresholds. The UE may then transmit a first CSI report part that includes an indication of the CSI hypothesis type. The UE would then transmit the second CSI report part including at least one precoding matrix indicator (PMI), as determined by the CSI hypothesis type.
Description
Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to user equipment (UE) -determined single transmission-reception point (sTRP) and multi-transmission-reception point (mTRP) channel state information (CSI) reporting.
Background
Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources. One example of such a network is the Universal Terrestrial Radio Access Network (UTRAN) . The UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS) , a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP) . Examples of multiple-access network formats include Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, and Single-Carrier FDMA (SC-FDMA) networks.
A wireless communication network may include a number of base stations or node Bs that can support communication for a number of user equipments (UEs) . A UE may communicate with a base station via downlink and uplink. The downlink (or forward link) refers to the communication link from the base station to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the base station.
A base station may transmit data and control information on the downlink to a UE and/or may receive data and control information on the uplink from the UE. On the downlink, a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters. On the uplink, a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.
As the demand for mobile broadband access continues to increase, the possibilities of interference and congested networks grows with more UEs accessing the long-range wireless communication networks and more short-range wireless systems being deployed in communities. Research and development continue to advance wireless technologies not only to meet the growing demand for mobile broadband access, but to advance and enhance the user experience with mobile communications.
SUMMARY
In one aspect of the disclosure, a method of wireless communication includes determining, by a user equipment (UE) , to prepare a channel state information (CSI) report according to a predetermined CSI report configuration, determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-reference signal (CSI-RS) resource with a single transmission configuration indication (TCI) state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both, transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CSI-reference signal (CSI-RS) resource indicator (CRI) , and at least one rank indicator (RI) , and transmitting, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one precoding matrix indicator (PMI) .
In an additional aspect of the disclosure, a method of wireless communication includes receiving, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI, determining, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type, and receiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
In an additional aspect of the disclosure, an apparatus configured for wireless communication includes means for determining, by a UE, to prepare a CSI report according to a predetermined CSI report configuration, means for determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both, means for transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI, and means for transmitting, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one PMI.
In an additional aspect of the disclosure, an apparatus configured for wireless communication includes means for receiving, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI, means for determining, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type, and means for receiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon. The program code further includes code to determine, by a UE, to prepare a CSI report according to a predetermined CSI report configuration, code to determine, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both, code to transmit, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI, and code to transmit, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one PMI.
In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon. The program code further includes code to receive, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI, code to determine, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type, and code to receive, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor, and a memory coupled to the processor. The processor is configured to determine, by a UE, to prepare a CSI report according to a predetermined CSI report configuration, to determine, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both, to transmit, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI, and to transmit, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one PMI.
In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor, and a memory coupled to the processor. The processor is configured to receive, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI, to determine, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type, and to receive, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purpose of illustration and description, and not as a definition of the limits of the claims.
A further understanding of the nature and advantages of the present disclosure may be realized by reference to the following drawings. In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.
FIG. 1 is a block diagram illustrating details of a wireless communication system.
FIG. 2 is a block diagram illustrating a design of a base station and a UE configured according to one aspect of the present disclosure.
FIGs. 3A-3C are block diagrams illustrating CSI reporting configurations for mTRP CSI reporting.
FIG. 4A is a block diagram illustrating example blocks executed by a UE to implement one aspect of the present disclosure.
FIG. 4B is a block diagram illustrating example blocks executed by a UE to determine a CSI hypothesis type according to one aspect of the present disclosure.
FIG. 4C is a block diagram illustrating example blocks executed by a base station to implement one aspect of the present disclosure.
FIG. 5 is a call flow diagram illustrating single and multi-resource CSI reporting between a UE and TRPs according to aspects of the present disclosure.
FIG. 6 is a block diagram illustrating an example UE configured according to one aspect of the present disclosure.
FIG. 7 is a block diagram illustrating an example base station configured according to one aspect of the present disclosure.
The detailed description set forth below, in connection with the appended drawings, is intended as a description of various configurations and is not intended to limit the scope of the disclosure. Rather, the detailed description includes specific details for the purpose of providing a thorough understanding of the inventive subject matter. It will be apparent to those skilled in the art that these specific details are not required in every case and that, in some instances, well-known structures and components are shown in block diagram form for clarity of presentation.
This disclosure relates generally to providing or participating in authorized shared access between two or more wireless communications systems, also referred to as wireless communications networks. In various embodiments, the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5
th Generation (5G) or new radio (NR) networks, as well as other communications networks. As described herein, the terms “networks” and “systems” may be used interchangeably.
An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like. UTRA, E-UTRA, and Global System for Mobile Communications (GSM) are part of universal mobile telecommunication system (UMTS) . In particular, long term evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP) , and cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) . These various radio technologies and standards are known or are being developed. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications associations that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP long term evolution (LTE) is a 3GPP project which was aimed at improving the universal mobile telecommunications system (UMTS) mobile phone standard. The 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices. The present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
In particular, 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface. In order to achieve these goals, further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks. The 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with an ultra-high density (e.g., ~1M nodes/km
2) , ultra-low complexity (e.g., ~10s of bits/sec) , ultra-low energy (e.g., ~10+ years of battery life) , and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ~99.9999%reliability) , ultra-low latency (e.g., ~ 1 ms) , and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ~ 10 Tbps/km
2) , extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates) , and deep awareness with advanced discovery and optimizations.
The 5G NR may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI) ; having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in 5G NR, with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD/TDD implementations, subcarrier spacing may occur with 15 kHz, for example over 1, 5, 10, 20 MHz, and the like bandwidth. For other various outdoor and small cell coverage deployments of TDD greater than 3 GHz, subcarrier spacing may occur with 30 kHz over 80/100 MHz bandwidth. For other various indoor wideband implementations, using a TDD over the unlicensed portion of the 5 GHz band, the subcarrier spacing may occur with 60 kHz over a 160 MHz bandwidth. Finally, for various deployments transmitting with mmWave components at a TDD of 28 GHz, subcarrier spacing may occur with 120 kHz over a 500 MHz bandwidth.
The scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency. The efficient multiplexing of long and short TTIs to allow transmissions to start on symbol boundaries. 5G NR also contemplates a self-contained integrated subframe design with uplink/downlink scheduling information, data, and acknowledgement in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink/downlink that may be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet the current traffic needs.
Various other aspects and features of the disclosure are further described below. It should be apparent that the teachings herein may be embodied in a wide variety of forms and that any specific structure, function, or both being disclosed herein is merely representative and not limiting. Based on the teachings herein one of an ordinary level of skill in the art should appreciate that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein. For example, a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer. Furthermore, an aspect may comprise at least one element of a claim.
FIG. 1 is a block diagram illustrating an example of a wireless communications system 100 that supports single resource and multi-resource CSI reporting in accordance with aspects of the present disclosure. The wireless communications system 100 includes base stations 105, UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or NR network. In some cases, wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low-cost and low-complexity devices.
Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 is supported. Each base station 105 may provide communication coverage for a respective geographic coverage area 110 via communication links 125, and communication links 125 between a base station 105 and a UE 115 may utilize one or more carriers. Communication links 125 shown in wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115. Downlink transmissions may also be referred to as forward link transmissions while uplink transmissions may also be referred to as reverse link transmissions.
The geographic coverage area 110 for a base station 105 may be divided into sectors making up a portion of the geographic coverage area 110, and each sector may be associated with a cell. For example, each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other types of cells, or various combinations thereof. In some examples, a base station 105 may be movable and, therefore, provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or by different base stations 105. The wireless communications system 100 may include, for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.
The term “cell” refers to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) , and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) operating via the same or a different carrier. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband Internet-of-things (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of devices. In some cases, the term “cell” may refer to a portion of a geographic coverage area 110 (e.g., a sector) over which the logical entity operates.
Some UEs 115, such as MTC or IoT devices, may be low cost or low complexity devices, and may provide for automated communication between machines (e.g., via machine-to-machine (M2M) communication) . M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application program that can make use of the information or present the information to humans interacting with the program or application. Some UEs 115 may be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for UEs 115 include entering a power saving “deep sleep” mode when not engaging in active communications, or operating over a limited bandwidth (e.g., according to narrowband communications) . In other cases, UEs 115 may be designed to support critical functions (e.g., mission critical functions) , and a wireless communications system 100 may be configured to provide ultra-reliable communications for these functions.
In certain cases, a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol) . One or more of a group of UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105, or be otherwise unable to receive transmissions from a base station 105. In some cases, groups of UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group. In some cases, a base station 105 may facilitate the scheduling of resources for D2D communications. In other cases, D2D communications may be carried out between UEs 115 without the involvement of a base station 105.
The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) , which may include at least one mobility management entity (MME) , at least one serving gateway (S-GW) , and at least one packet data network (PDN) gateway (P-GW) . The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be transferred through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation as well as other functions. The P-GW may be connected to the network operators IP services. The operators IP services may include access to the Internet, Intranet (s) , an IP multimedia subsystem (IMS) , or a packet-switched (PS) streaming service.
At least some of the network devices, such as a base station 105, may include subcomponents such as an access network entity, which may be an example of an access node controller (ANC) . Each access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, or a transmission/reception point (TRP) . In some configurations, various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 105) .
For example, a network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entirety of the shared spectrum. The network operating entity may also be allocated other time resources where the entity is given priority over other network operating entities to communicate using the shared spectrum. These time resources, prioritized for use by the network operating entity, may be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize the resources. Additional time resources may be allocated for any network operator to use on an opportunistic basis.
Access to the shared spectrum and the arbitration of time resources among different network operating entities may be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operators.
In various implementations, wireless communications system 100 may use both licensed and unlicensed radio frequency spectrum bands. For example, wireless communications system 100 may employ license assisted access (LAA) , LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (NR-U) , such as the 5 GHz ISM band. In some cases, UE 115 and base station 105 of the wireless communications system 100 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) frequency spectrum. In an unlicensed frequency portion of the shared radio frequency spectrum band, UEs 115 or base stations 105 may traditionally perform a medium-sensing procedure to contend for access to the frequency spectrum. For example, UE 115 or base station 105 may perform a listen before talk (LBT) procedure such as a clear channel assessment (CCA) prior to communicating in order to determine whether the shared channel is available.
A CCA may include an energy detection procedure to determine whether there are any other active transmissions on the shared channel. For example, a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that a channel is occupied. Specifically, signal power that is concentrated in a certain bandwidth and exceeds a predetermined noise floor may indicate another wireless transmitter. A CCA also may include message detection of specific sequences that indicate use of the channel. For example, another device may transmit a specific preamble prior to transmitting a data sequence. In some cases, an LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on a channel and/or the acknowledge/negative-acknowledge (ACK/NACK) feedback for its own transmitted packets as a proxy for collisions.
In general, four categories of LBT procedure have been suggested for sensing a shared channel for signals that may indicate the channel is already occupied. In a first category (CAT 1 LBT) , no LBT or CCA is applied to detect occupancy of the shared channel. A second category (CAT 2 LBT) , which may also be referred to as an abbreviated LBT, a single-shot LBT, or a 25-μs LBT, provides for the node to perform a CCA to detect energy above a predetermined threshold or detect a message or preamble occupying the shared channel. The CAT 2 LBT performs the CCA without using a random back-off operation, which results in its abbreviated length, relative to the next categories.
A third category (CAT 3 LBT) performs CCA to detect energy or messages on a shared channel, but also uses a random back-off and fixed contention window. Therefore, when the node initiates the CAT 3 LBT, it performs a first CCA to detect occupancy of the shared channel. If the shared channel is idle for the duration of the first CCA, the node may proceed to transmit. However, if the first CCA detects a signal occupying the shared channel, the node selects a random back-off based on the fixed contention window size and performs an extended CCA. If the shared channel is detected to be idle during the extended CCA and the random number has been decremented to 0, then the node may begin transmission on the shared channel. Otherwise, the node decrements the random number and performs another extended CCA. The node would continue performing extended CCA until the random number reaches 0. If the random number reaches 0 without any of the extended CCAs detecting channel occupancy, the node may then transmit on the shared channel. If at any of the extended CCA, the node detects channel occupancy, the node may re-select a new random back-off based on the fixed contention window size to begin the countdown again.
A fourth category (CAT 4 LBT) , which may also be referred to as a full LBT procedure, performs the CCA with energy or message detection using a random back-off and variable contention window size. The sequence of CCA detection proceeds similarly to the process of the CAT 3 LBT, except that the contention window size is variable for the CAT 4 LBT procedure.
Use of a medium-sensing procedure to contend for access to an unlicensed shared spectrum may result in communication inefficiencies. This may be particularly evident when multiple network operating entities (e.g., network operators) are attempting to access a shared resource. In wireless communications system 100, base stations 105 and UEs 115 may be operated by the same or different network operating entities. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity. Requiring each base station 105 and UE 115 of different network operating entities to contend for shared resources may result in increased signaling overhead and communication latency.
In some cases, operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) . Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD) , time division duplexing (TDD) , or a combination of both.
In some examples, base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. For example, wireless communications system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115) , where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communications may employ multipath signal propagation to increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream, and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) where multiple spatial layers are transmitted to multiple devices.
Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying certain amplitude and phase offsets to signals carried via each of the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
In one example, a base station 105 may use multiple antennas or antenna arrays to conduct beamforming operations for directional communications with a UE 115. For instance, some signals (e.g. synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station 105 multiple times in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
Some signals, such as data signals associated with a particular receiving device, may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) . In some examples, the beam direction associated with transmissions along a single beam direction may be determined based at least in in part on a signal that was transmitted in different beam directions. For example, a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions, and the UE 115 may report to the base station 105 an indication of the signal it received with a highest signal quality, or an otherwise acceptable signal quality. Although these techniques are described with reference to signals transmitted in one or more directions by a base station 105, a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) , or transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
A receiving device (e.g., a UE 115, which may be an example of a mmW receiving device) may try multiple receive beams when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive beams or receive directions. In some examples a receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal) . The single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio, or otherwise acceptable signal quality based at least in part on listening according to multiple beam directions) .
In certain implementations, the antennas of a base station 105 or UE 115 may be located within one or more antenna arrays, which may support MIMO operations, or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations. A base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
In additional cases, UEs 115 and base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully. HARQ feedback is one technique of increasing the likelihood that data is received correctly over a communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) . HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions) . In some cases, a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot, while in other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
Time intervals in LTE or NR may be expressed in multiples of a basic time unit, which may, for example, refer to a sampling period of T
s = 1/30,720,000 seconds. Time intervals of a communications resource may be organized according to radio frames each having a duration of 10 milliseconds (ms) , where the frame period may be expressed as T
f = 307,200 T
s. The radio frames may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. A subframe may be further divided into 2 slots each having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the smallest scheduling unit of the wireless communications system 100, and may be referred to as a transmission time interval (TTI) . In other cases, a smallest scheduling unit of the wireless communications system 100 may be shorter than a subframe or may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or in selected component carriers using sTTIs) .
In some wireless communications systems, a slot may further be divided into multiple mini-slots containing one or more symbols. In some instances, a symbol of a mini-slot or a mini-slot may be the smallest unit of scheduling. Each symbol may vary in duration depending on the subcarrier spacing or frequency band of operation, for example. Further, some wireless communications systems may implement slot aggregation in which multiple slots or mini-slots are aggregated together and used for communication between a UE 115 and a base station 105.
The term “carrier, ” as may be used herein, refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over a communication link 125. For example, a carrier of a communication link 125 may include a portion of a radio frequency spectrum band that is operated according to physical layer channels for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a pre-defined frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) , and may be positioned according to a channel raster for discovery by UEs 115. Carriers may be downlink or uplink (e.g., in an FDD mode) , or be configured to carry downlink and uplink communications (e.g., in a TDD mode) . In some examples, signal waveforms transmitted over a carrier may be made up of multiple sub-carriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
The organizational structure of the carriers may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR) . For example, communications over a carrier may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding the user data. A carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc. ) and control signaling that coordinates operation for the carrier. In some examples (e.g., in a carrier aggregation configuration) , a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
Physical channels may be multiplexed on a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, control information transmitted in a physical control channel may be distributed between different control regions in a cascaded manner (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces) .
A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a number of predetermined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) . In some examples, each served UE 115 may be configured for operating over portions or all of the carrier bandwidth. In other examples, some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
In a system employing MCM techniques, a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme) . Thus, the more resource elements that a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. In MIMO systems, a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers) , and the use of multiple spatial layers may further increase the data rate for communications with a UE 115.
Devices of the wireless communications system 100 (e.g., base stations 105 or UEs 115) may have a hardware configuration that supports communications over a particular carrier bandwidth, or may be configurable to support communications over one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include base stations 105 and/or UEs 115 that support simultaneous communications via carriers associated with more than one different carrier bandwidth.
In some cases, wireless communications system 100 may utilize enhanced component carriers (eCCs) . An eCC may be characterized by one or more features including wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or modified control channel configuration. In certain instances, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have a suboptimal or non-ideal backhaul link) . An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum, such as NR-shared spectrum (NR-SS) ) . An eCC characterized by wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are not capable of monitoring the whole carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power) .
In additional cases, an eCC may utilize a different symbol duration than other component carriers, which may include use of a reduced symbol duration as compared with symbol durations of the other component carriers. A shorter symbol duration may be associated with increased spacing between adjacent subcarriers. A device, such as a UE 115 or base station 105, utilizing eCCs may transmit wideband signals (e.g., according to frequency channel or carrier bandwidths of 20, 40, 60, 80 MHz, etc. ) at reduced symbol durations (e.g., 16.67 microseconds) . A TTI in eCC may consist of one or multiple symbol periods. In some cases, the TTI duration (that is, the number of symbol periods in a TTI) may be variable.
FIG. 2 shows a block diagram of a design of a base station 105 and a UE 115, which may be one of the base station and one of the UEs in FIG. 1. At base station 105, 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 the PBCH, PCFICH, PHICH, PDCCH, EPDCCH, MPDCCH etc. The data may be for the PDSCH, etc. The transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal. A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators 232a through 232t may be transmitted via the antennas 234a through 234t, respectively.
At UE 115, the antennas 252a through 252r may receive the downlink signals from the base station 105 and may provide received signals to the demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all the demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to a data sink 260, and provide decoded control information to a controller/processor 280.
On the uplink, at the UE 115, a transmit processor 264 may receive and process data (e.g., for the PUSCH) from a data source 262 and control information (e.g., for the PUCCH) from the controller/processor 280. The transmit processor 264 may also generate reference symbols for a reference signal. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators 254a through 254r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 105. At the base station 105, the uplink signals from the UE 115 may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 115. The processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
The controllers/ processors 240 and 280 may direct the operation at the base station 105 and the UE 115, respectively. The controller/processor 240 and/or other processors and modules at the base station 105 may perform or direct the execution of various processes for the techniques described herein. The controllers/processor 280 and/or other processors and modules at the UE 115 may also perform or direct the execution of the functional blocks illustrated in FIGs. 4A –4C, and/or other processes for the techniques described herein. The memories 242 and 282 may store data and program codes for the base station 105 and the UE 115, respectively. A scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
In order to maintain the quality of communications between network nodes, a UE may report information on the state of the communication channel with a serving base station. This channel state information (CSI) reporting may occur periodically, aperiodically, or semi-persistently. Additionally, a CSI report may include information such as a CSI-reference signal (CSI-RS) resource indicator (CRI) , which identifies a particular resource or beam of CSI-RS, a rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) , among others. The manner in which a UE reports this CSI may be configured via a CSI report configuration message. The current standards for CSI report configuration allows for one to three settings: a first setting that includes a channel measurement resource (CMR) setting, a second setting that includes the CMR setting and either a CSI-interference measurement (CSI-IM) setting or a non-zero power interference measurement resource (NZP-IMR) setting, or a third setting that includes the CMR, CSI-IM, and NZP-IMR settings. Each setting includes a number of candidate resource sets, in which each candidate resource set includes one or more resources that may correspond to one or more TRPs. A transmission configuration indication (TCI) state associated with the resource may indicate, among other things, whether the resource is from the same or different TRP. Where resources share the same TCI state, such resources may be associated with the same TRP, while the resources with different TCI states may be associated with different TRPs.
The UE may select one CMR resource out of N resources. The selected CMR creates an active set corresponding to one or more resources. Each resource may be associated with a single CSI-IM resource, if the CSI-IM setting is included in the CSI reporting configuration. Each CMR resource and each CSI-IM resource may be associated with a NZP IMR resource set comprising multiple NZP IMR resources, if all three settings are configured. Where only the CMR and NZP IMR settings are configured, each CMR resource would be associated with a NZP IMR resource set comprising multiple NZP IMR resources.
According to current standards, multiple TRP (mTRP) transmission schemes include single downlink control information (DCI) -scheduled schemes and multi-DCI-scheduled schemes. Single DCI-scheduled schemes may be applicable to operations including an ideal backhaul. In one example with two TRPs, a first TRP transmits the DCI which schedules the transmissions from both TRPs. Such single DCI-scheduled schemes include spatial division multiplex (SDM) schemes (e.g., non-coherent joint transmission (NCJT) ) , where a first set of layers may be transmitted from a first TRP and a second set of layers transmitted from a second TRP. The resulting transmission may include the same frequency domain resource assignment (FDRA) and time domain resource assignment (TDRA) . Single DCI-scheduled schemes also include frequency division multiplex (FDM) schemes, which may include the same rank and same codeword transmitted repeatedly from the two TRPs with different redundancy version (RV) and different FDRA across the two TRPs. Single DCI-scheduled schemes may also include time division multiplex (TDM) schemes, which may further include the same rank and same codeword transmitted repeatedly from the two TRPs with different RV and a different TDRA across the two TRPs.
Multi-DCI-scheduled schemes may be applicable to ideal or non-ideal backhauls. According to the two TRP example referenced above, each TRP transmits its own DCI that schedules its own transmission to the UE. Each DCI schedules an individual transmission (e.g., PDSCH) similar to a carrier aggregation (CA) framework. Resource allocation for such multi-DCI-schedules schemes can be overlapped, non-overlapped or partially overlapped.
FIGs. 3A-3C are block diagrams illustrating CSI reporting configurations for sTRP and mTRP transmissions where the CSI is either associated to a single resource with a TCI state for sTRP transmissions or a pair of CSI-reference signal (CSI-RS) resources with different TCI states for mTRP transmissions. FIG. 3A illustrates a first sTRP scenario, in which UE 115 selects, via CRI, the beam/resource for transmission from TRP 0. The CSI-RS resource for channel measurement in such resource selection corresponds to n1, and the CSI-IM resource for interference measurement corresponds to m1, which includes the interference attributed to transmissions from both TRP 1 and TRP 105, which is outside of the measurement set. FIG. 3B illustrates a second sTRP scenario, in which UE 115 selects, via CRI, the beam/resource for transmission from TRP 1. The CSI-RS resource for channel measurement in such resource selection corresponds to n2, and the CSI-IM resource for interference measurement corresponds to m2, which includes the interference attributed to transmissions from both TRP 0 and TRP 105. FIG. 3C illustrates a first mTRP scenario, in which UE 115 selects, via CRI, the beams/resources for transmission from both TRP 0 and TRP 1. The CSI-RS resources for channel measurement in such mTRP resource selection corresponds to n1 and n2, and the CSI-IM resource for interference measurement corresponds to m3. Table 1 below identifies the CSI reporting hypotheses for the M1=2 single resource scenarios and M2=1 multiple resource scenario of FIGs. 3A-3C.
Table 1
In a CSI report configuration with K resources, some of the resources are mapped to single resource CSI hypotheses, which are associated with sTRP transmissions, and some resources are paired and mapped to multi-resource CSI hypotheses, which are associated with mTRP transmissions. For example, there may be M1 single resource CSI hypotheses in a one-to-one association with M1 resources, and M2 multi-source CSI hypotheses that correspond to M2 resource-pairs. With reference to the examples illustrated in FIGs. 3A-3C, there are total K=2 resources, and there are two single resource CSI hypotheses illustrated (FIGs. 3A &3B) where M1 = 2, and one multi-resource CSI hypothesis illustrated (FIG. 3C) , where M2 = 1.
For CSI reporting, there are currently two alternative options for the UE. In a first alternative, the UE may report the best single resource CSI hypothesis out of the M1 single resource CSI hypotheses for sTRP transmissions and the best multi-resource CSI hypothesis out of the M2 multi-resource CSI hypothesis for mTRP transmissions, or, in the second alternative, the UE may report best CSI hypothesis out of all single source CSI hypotheses and multi-resource CSI hypotheses (e.g., 1 out of M1+M2) . Issues may arise in the first alternative CSI reporting, as it consumes large CSI reporting overhead (e.g., 3 PMIs are reported, 1 for the single resource CSI hypothesis, and 2 for multi-resource CSI hypothesis) . Additionally, issues may arise in the second alternative CSI reporting, as the UE may prefer reporting the multi-resource CSI hypothesis, as channels from mTRP transmissions generally result in better diversity and transmission from multiple TRPs results in a higher power.
FIG. 4A is a block diagram illustrating example blocks executed by a UE to implement one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIGs. 2 and 6. FIG. 6 is a block diagram illustrating UE 115 configured according to one aspect of the present disclosure. UE 115 includes the structure, hardware, and components as illustrated for UE 115 of FIG. 2. For example, UE 115 includes controller/processor 280, which operates to execute logic or computer instructions stored in memory 282, as well as controlling the components of UE 115 that provide the features and functionality of UE 115. UE 115, under control of controller/processor 280, transmits and receives signals via wireless radios 600a-r and antennas 252a-r. Wireless radios 600a-r includes various components and hardware, as illustrated in FIG. 2 for UE 115, including modulator/demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266.
At block 400, a UE determines to prepare a CSI report according to a predetermined CSI report configuration. A UE, such as UE 115, receives a CSI report configuration via antennas 252a-r and wireless radios 600a-r, which may configure UE 115 for performing channel measurements and reporting the state of the communication channel via CSI reports to serving base stations, whether on a periodic, aperiodic, or semi-persistent basis. UE 115 stores such configuration in memory 282 at CSI report configuration 601. In preparation for CSI reporting, the UE measures the channels to determine the various CSI report content, including CRI, RI, PMI, CQI, and the like. UE 115, under control of controller/processor 280, executes measurement logic 602, in memory 282. The steps and instructions executed by controller/processor 280 of measurement logic 602 enables the functionality and capability for UE 115 to measure such channel qualities (referred to herein as the “execution environment” of measurement logic 602) .
The CSI configuration may identify when UE 115 is to perform such measurement and reporting. For periodic CSI, a UE receives the CSI configuration via RRC messaging, in which the configuration comprises the periodicity and offset of CSI reporting. The UE may then start to report the CSI accordingly once the RRC connection is established. For semi-persistent CSI, the UE also receives the CSI configuration via RRC messaging, the configuration comprises the periodicity and offset of CSI reporting. If the semi-persistent (SP) -CSI is to transmit on PUCCH, the UE will further receive a medium access control control element (MAC CE) to activate the SP-CSI and then starts the SP-CSI after receiving the activation, until receiving another MAC CE to deactivate the SP-CSI. If the SP-CSI is to transmit on PUSCH, the UE will further receive a DCI to trigger the SP-CSI, after which the UE starts the SP-CSI until receiving another DCI to deactivate the SP-CSI. For aperiodic CSI, the UE receive the CSI configuration via RRC messaging, the UE will then receive a DCI to trigger the aperiodic (A) -CSI. The UE will report the A-CSI after receiving the triggering.
At block 401, the UE determines a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes either a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both. As noted above, UE 115 may include either a single resource CSI hypothesis, a multi-resource CSI hypothesis, or both within the CSI report. Under control of controller/processor 280, UE 115 executes CSI hypothetical type logic 603, stored in memory 282. In accordance with aspects of the present disclosure, UE 115, within the execution environment of CSI hypothetical type logic 603, may determine which CSI hypothesis to report by comparing a relationship between the single resource and multi-resource CQI indications against one or more thresholds. The CQI indications may be the CQI index value of the single resource CQI with respect to the multi-resource CQI or the associated spectral efficiency of the single resource transmissions with respect to the multi-resource transmissions. Such one or more threshold values may be either configured via network signaling or predefined in the specification. When configured by network signaling, such signaling may include radio resource control (RRC) signaling in a CSI report configuration, a medium access control -control element (MAC CE) , or DCI. The various optional aspects of comparing the single and multi-resource CQI indications against the one or more thresholds are described in greater details below.
At block 402, the UE transmits a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI. Once UE 115 determines the CSI hypothesis type that will be reported along with the other CSI reporting parameters, within the execution environment of CSI hypothetical type logic 603, UE 115, under control of controller/processor 280, executes CSI report generator 604, stored in memory 282, to generate the first part of the CSI report (CSI-1) which has a fixed payload length and includes the CRI and RI. According to the various aspects of single resource and multi-resource CSI reporting described herein, CSI-1 includes an indication of the CSI hypothesis type that is being reported. Such indication will be reported to the serving base station whether the second part of the CSI report will include a single resource PMI, a multi-resource PMI, or both, in addition to the resources on which such PMI will be transmitted. UE 115 will then transmit the first part of the CSI report (CSI-1) via wireless radios 600a-r and antennas 252a-r.
At block 403, the UE transmits a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one PMI. Within the execution environment of CSI report generator 604, UE 115 generates the second party of the CSI report (CSI-2) , which includes the PMI, CQI, and the like. The PMI will depend on what CSI hypothesis type has been selected by the UE. CSI-2 may include a single PMI, when UE 115 selects a single resource CSI hypothesis, a multi-resource PMI, when the UE selects a multi-resource CSI hypothesis, or both. UE 115 transmits CSI-2 via wireless radios 600a-r and antennas 252a-r.
FIG. 4B is a block diagram illustrating example blocks executed by a UE to determine a CSI hypothesis type as described at block 401 of FIG. 4A, according to one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIGs. 2 and 6.
At block 401-a, the UE determines a comparison of a CQI relationship of a single source CQI indication of the single source CSI hypothesis and a multi-source CQI indication of the multi-source CSI hypothesis against one or more threshold values. Within the execution environment of CSI hypothetical type logic 603, UE 115 will determine the comparison of the CQI relationship against the one or more threshold values. In a first optional aspect of the present disclosure, UE 115 may compare the CQI relationship against a single threshold value. The CQI relationship may be implemented as the CQI index values or as the percentage values of spectral efficiency (SE) corresponding to the CQI index values. There can be one comparison using a single threshold value, such as:
CQI index of a multi-resource –CQI index of a single resource > threshold (1a)
or
SE of a multi-resource /SE of a single resource > threshold (1b)
Where a multi-resource CSI hypothesis is selected when the CQI relationship satisfies the threshold comparison. When the threshold is not satisfied, UE 115 may select either a single resource CSI hypothesis or both. There can also be multiple comparisons using the single threshold value, such as:
CQI of a multi-resource –CQI of a single resource > threshold; and
CQI of a single resource –CQI of a multi-resource > threshold (2a)
or
SE of a multi-resource /SE of a single resource > threshold; and
SE of a single resource /SE of a multi-resource > threshold (2b)
Where the multi-resource CSI hypothesis is selected when the threshold comparison of equations (1a) or (1b) is satisfied, the single resource CSI hypothesis is selected when the threshold comparison of equations (2a) or (2b) is satisfied, and both CSI hypotheses are selected otherwise.
A second optional aspect of the present disclosure may compare the CQI relationship against multiple threshold values, such as:
CQI of a multi-resource –CQI of a single resource > threshold1; and (3a)
CQI of a single resource –CQI of a multi-resource > threshold2 (4a)
or
SE of a multi-resource /SE of a single resource > threshold; and (3b)
SE of a single resource /SE of a multi-resource > threshold (4b)
Where the multi-resource CSI hypothesis is selected when the threshold1 comparison of equations (3a) or (3b) is satisfied, the single resource CSI hypothesis is selected when the threshold2 comparison of equations (4a) or (4b) is satisfied, and both CSI hypotheses are selected otherwise.
At block 401-b, the UE selects the CSI hypothesis type based on a result of the comparison. As described above, the selection of the CSI hypothesis type by UE 115, within the execution environment of CSI hypothetical type logic 603, may be indicated by the result of the comparison of the CQI indication against the one or more threshold values.
FIG. 4C is a block diagram illustrating example blocks executed by a base station to implement one aspect of the present disclosure. On the base station side, as a base station receives a first part of the CSI report, it may identify the CSI hypothesis type selected by a served UE. The example blocks will also be described with respect to base station 105 as illustrated in FIGs. 2 and 7. FIG. 7 is a block diagram illustrating base station 105 configured according to one aspect of the present disclosure. Base station 105 includes the structure, hardware, and components as illustrated for base station 105 of FIG. 2. For example, base station 105 includes controller/processor 240, which operates to execute logic or computer instructions stored in memory 242, as well as controlling the components of base station 105 that provide the features and functionality of base station 105. Base station 105, under control of controller/processor 240, transmits and receives signals via wireless radios 700a-t and antennas 234a-t. Wireless radios 700a-t includes various components and hardware, as illustrated in FIG. 2 for base station 105, including modulator/demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230.
At block 410, a base station receives a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI. Base station 105, under control of controller/processor 240, executes CSI reporting 701 and CSI hypothetical type logic 702, stored in memory 242. Within the execution environments of CSI reporting 701 and CSI hypothetical type logic 702, base station 105 receives the first CSI report part (CSI-1) via antennas 234a-t and wireless radios 700a-t. Further within the execution environment of CSI hypothetical type logic 702, base station 105 uses the indication of the CSI hypothesis type to determine the CSI hypothesis type selected by the UE and a resulting one or more PMI that would be included in the second part of the CSI report along with the resources used to transmit the one or more PMI.
At block 411, the base station determines, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type. Within the execution environment of CSI hypothetical type logic 702, base station 105 uses the indication of the CSI hypothesis type to determine the CSI hypothesis type selected by the UE and a resulting one or more PMI that would be included in the second part of the CSI report along with the resources used to transmit the one or more PMI.
At block 412, the base station receives the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type. As base station 105 is able to determine the CSI hypothesis type and corresponding PMI expected in the second part of the CSI report and the resources on which the PMI is transmitted, base station 105, within the execution environment of CSI hypothetical type logic 702, looks to those identified resources, received via antennas 234a-t and wireless radios 700a-t, to identify the expected at least one PMI in the second part of the CSI report.
FIG. 5 is a call flow diagram illustrating single and multi-resource CSI reporting between UE 115 and TRP0 and TRP1 according to aspects of the present disclosure. TRP0 and TRP1 are within a measurement set of base stations in communication with UE 115. UE 115 receives CSI report configuration message 500, which includes a set of configuration parameters for UE 115 to conduct CSI reporting. In preparation for CSI reporting, UE 115 performs channel measurements 501, which measures channel quality and channel characteristics for communications between UE 115 and both TRP0 and TRP1. Channel measurements may be conducted by UE 115 based on reference signals or other signaling received from TRP0 and TRP1 or by measuring the channel during zero power interference management resources.
After channel measurements 501, UE 115 may determine the CSI hypothesis type that will be reported in the next CSI report. At 502, UE 115 compares a single resource and multi-resource CQI relationship to one or more thresholds. For determining the CSI hypothesis type for CSI reporting, a first aspect according to the present disclosure may employ one or more threshold values to determine whether to report a single source CSI hypothesis, a multi-source CSI hypothesis, or both. In a first optional aspect, a single threshold value may be implemented, such that, when CQI (multiple resources of mTRP transmissions) –CQI (single resource of sTRP transmissions) > threshold1, UE 115 reports the best multi-source CSI hypothesis. Otherwise, UE 115 reports either a single source CSI hypothesis or both. When the relationship of the CQI of the mTRP transmission multiple resources and the sTRP transmission single resource fail to satisfy threshold1, whether UE 115 reports the single resource CSI hypothesis or both may be determined either according to network configuration received via a CSI configuration message, such as CSI report configuration message 500 or other such configuration message or according to a predefined standard.
In a second optional aspect of the comparison at 502, a single threshold value may be used in comparison to different relationships of the CQI indication for the multiple resources of the mTRP transmissions and the single resource of the sTRP transmissions. For example, the second optional aspect provides that when CQI (multiple resources of mTRP transmissions) –CQI (single resource of sTRP transmissions) > threshold1, then the UE may report the multi-resource CSI hypothesis, or when CQI (single resource of sTRP transmissions) –CQI (multi-resource of mTRP transmissions) > threshold1, then UE 115 may select to report the single resource CSI hypothesis. Otherwise, UE 115 may select to report both the single resource CSI hypothesis and the multi-resource CSI hypothesis.
In a third optional aspect of the comparison at 502, multiple threshold values may be implemented, such that, when CQI (multi-resource of mTRP transmissions) –CQI (single resource of sTRP transmissions) > threshold1, then UE 115 may select to report the multi-resource CSI hypothesis, and when CQI (single resource of sTRP transmission) –CQI (multi-resource of mTRP transmissions) > threshold2, then UE 115 may select to report the single source CSI hypothesis. Otherwise, UE 115 may report both the single source CSI hypothesis and the multi-source CSI hypothesis.
It should be noted that such threshold values used in the comparison at 502, whether implemented with single threshold values or multiple threshold values, may be configured by network signaling or predefined at UE 115. When provided via network signaling, a base station serving UE 115, such as TRP0 and TRP1, may signal the one or more threshold values via RRC signaling in a CSI report configuration, such as CSI report configuration 500, via a MAC CE (not shown) , or DCI (not shown) .
It should further be noted that the CQI indication may include CQI index values, such that the threshold value may include integer values (e.g., 1 or 2) . However, because each CQI corresponds to a spectral efficiency (SE) , the CQI indication may also be represented as percentage values of the spectral efficiency. Thus, when represented as a spectral efficiency, the first optional aspect described above may use a comparison of SE (multi-resource of mTRP transmissions) /SE (single resource of sTRP transmissions) > threshold1. The comparison of the second optional aspect described above may include SE (multi-resource of mTRP transmissions) /SE (single resource of sTRP transmissions) > threshold1 and SE (single resource of sTRP transmissions) /SE (multi-resource of mTRP transmissions) > threshold1. The comparison of the third optional aspect described above may include SE (multi-resource of mTRP transmissions) /SE (single resource of sTRP transmissions) > threshold1 and SE (single resource of sTRP transmissions) /SE (multi-resource of mTRP transmissions) > threshold2. Additionally, all such comparisons at 502, whether the CQI indications are represented by index integers or by spectral efficiency percentages, are based on a wideband CQI or wideband spectral efficiency average across all frequency bands.
As a part of the uplink control information (UCI) message design, in general, if reporting the best single resource CSI hypothesis and the best multi-resource CSI hypothesis, UE 115 may report two CRIs (one indicating a resource used for CSI measured using a single resource of sTRP transmission, referred to herein as a single resource CRI, and one indicating a resource pair used for CSI measured using a resource-pair of mTRP transmissions, referred to herein as a multi-resource CRI) , two RIs (one indicating the rank measured using the resource indicated by the single resource CRI, referred to herein as a single resource RI, the other indicating the rank-pair measured using the resource-pair indicated by the multi-resource CRI, referred to herein as a multi-source RI) , three PMIs (one associated with the single resource RI and the resource indicated by the single resource CRI, referred to herein as a single resource PMI, and the other two are a PMI-pair associated with the multi-resource RI and the resource-pair indicated by the multi-resource CRI, referred to herein as a multi-resource PMI) , and two CQIs (one for measuring the channel quality of the single resource identified by the single resource CRI, and one for measuring the channel quality of the multiple resources identified by the multi-resource CRI) . However, when reporting the best CSI hypothesis among the single resource and multi-resource CSI hypotheses, UE 115 may report one CRI (either for single resource CSI hypothesis, or for multi-resource CSI hypotheses) , one RI (either for single resource CSI hypothesis, or for multi-resource CSI hypotheses) , one PMI (for single resource CSI hypothesis) or two PMIs (for multi-resource CSI hypothesis) , and one CQI (either for single resource CSI hypothesis, or for multi-resource CSI hypotheses) . UE 115 would transmit the CSI report in two separate parts and transmissions: CSI-1 and CSI-2. CSI-1 has a fixed payload and includes the CRI and RI that will be used to determine the payload of CSI-2. CSI-2 includes the remaining CSI report contents including the full PMI.
In a second optional implementation of CSI-1 503, the CRI field may be reused by providing an additional codepoint for the CRI. In such second optional implementation, UE 115 reports two CRIs, a first for a single resource CRI for single resource CSI hypothesis with log2 (M1+1) bits, and a second for multi-resource CSI hypothesis with log2 (M2+1) bits. The single resource CRI report codepoint of M1 would indicate CSI-2 504 includes a single resource PMI along with the resource selected for reporting the single resource PMI, while a codepoint of M1+1 would indicate CSI-2 504 does not include the single resource PMI. Similarly, the second CRI report codepoint of M2 would indicate that CSI-2 504 includes a multi-resource PMI along with identification of the resource selected for reporting the multi-resource PMI, while a codepoint of M2+1 would indicate CSI-2 504 does not include the multi-resource PMI.
In a third optional aspect of CSI-1 503, the RI field may be reused by providing an additional codepoint for the RI. UE 115 would report two RIs, the first, single resource RI for the single resource CSI hypothesis with log2 (max_rank_sTRP+1) bits, where max_rank_sTRP represents the maximum allowable rank associated with the single resources to be reported by UE 115, and the second, multi-resource RI for the multi-resource CSI hypothesis with log2 (#RankPair+1) bits, where #RankPair represents the total number of allowable rank pairs associated with the multiple resources, e.g., (1+1) , (1+2) , (2+1) , (2+2) , etc. The first RI report codepoint of rank=0 would indicate that CSI-2 504 does not include the single resource PMI, while the first RI report codepoint of rank= (1…max_rank_sTRP) would indicate that CSI-2 504 includes a single resource PMI and indicates a rank for that PMI. The second RI report codepoint of the rank_pair = {0, 0} would indicate that CSI-2 504 does not include the multi-resource PMI, while the second RI report codepoint of the rank_pair = {#RankPair} would indicate that CSI-2 504 includes a multi-resource PMI and indicates a rank for that multi-resource PMI.
In a fourth optional implementation of CSI-1 503, one joint CRI may be configured to indicate whether UE 115 reports the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both, and in each case which CSI hypotheses are selected. The joint CRI may include log2 (M1*M2+M1+M2) bits, where codepoints 1.. M1 would indicate that CSI-2 504 includes the single resource CSI hypothesis, codepoints M1+1…M1+M2, would indicate that CSI-2 504 includes the multi-resource CSI hypothesis, and codepoints M1+M2+1…M1+M1+M1*M2, would indicate that CSI-2 504 includes both.
After UE 115 transmits CSI-1 503 as generated according to one of the optional implementations, UE 115 transmits the remaining CSI report information via CSI-2 504. CSI-2 504 includes the PMI according to the CSI hypothesis type selected by UE 115, along with the CQI and any other CSI report information. As TRP0 and TRP1 receive CSI-1 503, it identifies, via the additional indicator of the selected CSI hypothesis type, will know whether the PMI of CSI-2 504 is the single resource PMI, the multi-resource PMI, or both, in additional to the resources on which the PMI is transmitted.
Those of skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
The functional blocks and modules in FIGs. 4A –4C may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, application, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and/or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure. Skilled artisans will also readily recognize that the order or combination of components, methods, or interactions that are described herein are merely examples and that the components, methods, or interactions of the various aspects of the present disclosure may be combined or performed in ways other than those illustrated and described herein.
The various aspects of the present disclosure may be implemented in many different ways, including methods, processes, non-transitory computer-readable medium having program code recorded thereon, apparatus having one or more processors with configurations and instructions for performing the described features and functionality, and the like. In a first aspect of wireless communication may include determining, by a UE, to prepare a CSI report according to a predetermined CSI report configuration; determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both; transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI; and transmitting, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one PMI.
In a second aspect, alone or in combination with the first aspect, wherein the indication includes a mode indicator that explicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a third aspect, alone or in combination with one or more of the first aspect or the second aspect, wherein the first CSI report part includes the mode indicator, a single resource CRI, a multi-resource CRI, a single resource RI, and a multi-resource RI, and wherein the second CSI report part includes one of: an single resource PMI and two multi-resource PMIs associated with a first value of the mode indicator indicating the CSI hypothesis type is both, the single resource PMI associated with a second value of the mode indicator indicating the CSI hypothesis type is the single resource CSI hypothesis, and the multi-resource PMI associated with a third value of the mode indicator indicating the CSI hypothesis type is the multi-resource CSI hypothesis.
In a fourth aspect, alone or in combination with one or more of the first aspect through the third aspect, wherein the indication includes an additional codepoint in a CRI field that implicitly identifies the CSI hypothesis type in the second CSI report part is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a fifth aspect, alone or in combination with one or more of the first aspect through the fourth aspect, wherein the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a CSI-RS resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and multiple CSI-RS resources the multi-resource PMI is associated with, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value, the single resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the first multi-resource CRI value, and the multi-resource PMI associated with the multi-resource CRI indication being the first single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value.
In a sixth aspect, alone or in combination with one or more of the first aspect through the fifth aspect, wherein the indication includes an additional codepoint in an RI field that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a seventh aspect, alone or in combination with one or more of the first aspect through the sixth aspect, wherein the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and ranks of the multi-resource PMI, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the second multi-resource RI value, the single resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the first multi-resource RI value, and the multi-resource PMI associated with the multi-resource RI indication being the first single resource RI value and the multi-resource RI indication being the second multi-resource RI value.
In an eighth aspect, alone or in combination with one or more of the first aspect through the seventh aspect, wherein the indication includes a joint CRI indicator that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a ninth aspect, alone or in combination with one or more of the first aspect through the eighth aspect, wherein the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the joint CRI indication being the first joint CRI value, the multi-resource PMI associated with the joint CRI indication being the second joint CRI value, and the single resource PMI associated with the joint CRI indication being the third value.
In a tenth aspect, alone or in combination with one or more of the first aspect through the ninth aspect, wherein the determining the CSI hypothesis type includes determining a comparison of a CQI relationship of a single resource CQI indication of the single resource CSI hypothesis and a multi-resource CQI indication of the multi-resource CSI hypothesis against one or more threshold values; and selecting the CSI hypothesis type based on a result of the comparison.
In an eleventh aspect, alone or in combination with one or more of the first aspect through the tenth aspect, wherein the one or more threshold values includes a single threshold value, wherein the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and herein the selecting the CSI hypothesis type includes one of: selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; and selecting one of the single resource CSI hypothesis or both the single resource CSI hypothesis and the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
In a twelfth aspect, alone or in combination with one or more of the first aspect through the eleventh aspect, further including obtaining a CSI reporting indicator identifying one of the single resource CSI hypothesis or both for reporting, wherein the one of the single resource CSI hypothesis or both is selected according to the CSI reporting indicator in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
In a thirteenth aspect, alone or in combination with one or more of the first aspect through the twelfth aspect, wherein the CSI reporting indicator is obtained via one of: a predefined configuration at the UE or a system information message received from a neighboring base station.
In a fourteenth aspect, alone or in combination with one or more of the first aspect through the thirteenth aspect, wherein the one or more threshold values includes a single threshold value, wherein the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the single threshold value, and wherein the selecting the CSI hypothesis type includes one of: selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the single threshold value selecting both in response to the comparison failing to satisfy the single threshold value.
In a fifteenth aspect, alone or in combination with one or more of the first aspect through the fourteenth aspect, wherein the one or more threshold values includes a first threshold value and a second threshold value, wherein the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the first threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the second threshold value, and wherein the selecting the CSI hypothesis type includes one of: selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the first threshold value; selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the second threshold value; selecting both in response to the comparison failing to satisfy each of the first threshold value and the second threshold value.
In a sixteenth aspect, alone or in combination with one or more of the first aspect through the fifteenth aspect, further including obtaining, by the UE, the one or more threshold values via one of: one or more predefined threshold values at the UE or a CSI reporting configuration message received via a neighboring base station.
In a seventeenth aspect, alone or in combination with one or more of the first aspect through the sixteenth aspect, wherein the multi-resource CQI indication and the single resource CQI indication include one of: a CQI index, or a spectral efficiency associated with the CQI index.
In an eighteenth aspect, alone or in combination with one or more of the first aspect through the seventeenth aspect, wherein the comparison compares the CQI relationship of a wideband CQI indication against one or more threshold values across all frequency bands.
A nineteenth aspect of wireless communication includes receiving, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI; determining, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type; and receiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
In a twentieth aspect, alone or in combination with the nineteenth aspect, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis type, a multi-resource CSI hypothesis type, or both.
In a twenty-first aspect, alone or in combination with one or more of the nineteenth aspect or the twentieth aspect, wherein the indication of the CSI hypothesis type includes a mode indicator identifying the CSI hypothesis type, and wherein the PMI type to be included in the second CSI report part corresponds to the CSI hypothesis type identified by the mode indicator.
In a twenty-second aspect, alone or in combination with one or more of the nineteenth aspect through the twenty-first aspect, wherein the indication of the CSI hypothesis type includes an additional codepoint of a CRI field of the first CSI report part, and wherein the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a PMI resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and the PMI resource the multi-resource PMI is associated with
In a twenty-third aspect, alone or in combination with one or more of the nineteenth aspect through the twenty-second aspect, wherein the indication of the CSI hypothesis type includes an additional codepoint of a RI field of the first CSI report part, and wherein the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and the rank of the multi-resource PMI.
In a twenty-fourth aspect, alone or in combination with one or more of the nineteenth aspect through the twenty-third , wherein the indication of the CSI hypothesis type includes an additional codepoint of a joint CRI of the first CSI report part, and wherein the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both.
A twenty-fifth aspect configured for wireless communication includes means for determining, by a UE, to prepare a CSI report according to a predetermined CSI report configuration; means for determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both; means for transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI; and means for transmitting, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one PMI.
In a twenty-sixth aspect, alone or in combination with the twenty-fifth aspect, wherein the indication includes a mode indicator that explicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a twenty-seventh aspect, alone or in combination with one or more of the twenty-fifth aspect or the twenty-sixth aspect, wherein the first CSI report part includes the mode indicator, a single resource CRI, a multi-resource CRI, a single resource RI, and a multi-resource RI, and wherein the second CSI report part includes one of: a single resource PMI and two multi-resource PMIs associated with a first value of the mode indicator indicating the CSI hypothesis type is both, the single resource PMI associated with a second value of the mode indicator indicating the CSI hypothesis type is the single resource CSI hypothesis, and the multi-resource PMI associated with a third value of the mode indicator indicating the CSI hypothesis type is the multi-resource CSI hypothesis.
In a twenty-eighth aspect, alone or in combination with one or more of the twenty-fifth aspect through the twenty-seventh aspect, wherein the indication includes an additional codepoint in a CRI field that implicitly identifies the CSI hypothesis type in the second CSI report part is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a twenty-ninth aspect, alone or in combination with one or more of the twenty-fifth aspect through the twenty-eighth, wherein the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a CSI-RS resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and multiple CSI-RS resources the multi-resource PMI is associated with, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value, the single resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the first multi-resource CRI value, and the multi-resource PMI associated with the multi-resource CRI indication being the first single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value.
In a thirtieth aspect, alone or in combination with one or more of the twenty-fifth aspect through the twenty-ninth aspect, wherein the indication includes an additional codepoint in an RI field that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a thirty-first aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirtieth aspect, wherein the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and ranks of the multi-resource PMI, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the second multi-resource RI value, the single resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the first multi-resource RI value, and the multi-resource PMI associated with the multi-resource RI indication being the first single resource RI value and the multi-resource RI indication being the second multi-resource RI value.
In a thirty-second aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-first aspect, wherein the indication includes a joint CRI indicator that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a thirty-third aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-second aspect, wherein the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the joint CRI indication being the first joint CRI value, the multi-resource PMI associated with the joint CRI indication being the second joint CRI value, and the single resource PMI associated with the joint CRI indication being the third value.
In a thirty-fourth aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-third aspect, wherein the means for determining the CSI hypothesis type includes means for determining a comparison of a channel quality indicator (CQI) relationship of a single resource CQI indication of the single resource CSI hypothesis and a multi-resource CQI indication of the multi-resource CSI hypothesis against one or more threshold values; and means for selecting the CSI hypothesis type based on a result of the comparison.
In a thirty-fifth aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-fourth aspect, wherein the one or more threshold values includes a single threshold value, wherein the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and wherein the means for selecting the CSI hypothesis type includes one of: means for selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; means for selecting one of the single resource CSI hypothesis or both the single resource CSI hypothesis and the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
In a thirty-sixth aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-fifth aspect, further including means for obtaining a CSI reporting indicator identifying one of the single resource CSI hypothesis or both for reporting, wherein the one of the single resource CSI hypothesis or both is selected according to the CSI reporting indicator in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
In a thirty-seventh aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-sixth aspect, wherein the CSI reporting indicator is obtained via one of: a predefined configuration at the UE or a system information message received from a neighboring base station.
In a thirty-eighth aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-seventh aspect, wherein the one or more threshold values includes a single threshold value, wherein the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the single threshold value, and wherein the means for selecting the CSI hypothesis type includes one of: means for selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; means for selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the single threshold value, means for selecting both in response to the comparison failing to satisfy the single threshold value.
In a thirty-ninth aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-eighth aspect, wherein the one or more threshold values includes a first threshold value and a second threshold value, wherein the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the first threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the second threshold value, and wherein the means for selecting the CSI hypothesis type includes one of: means for selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the first threshold value; means for selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the second threshold value, and means for selecting both in response to the comparison failing to satisfy each of the first threshold value and the second threshold value.
In a fortieth aspect, alone or in combination with one or more of the twenty-fifth aspect through the thirty-ninth aspect, further including means for obtaining, by the UE, the one or more threshold values via one of: one or more predefined threshold values at the UE or a CSI reporting configuration message received via a neighboring base station.
In a forty-first aspect, alone or in combination with one or more of the twenty-fifth aspect through the fortieth aspect, wherein the multi-resource CQI indication and the single resource CQI indication include one of: a CQI index, or a spectral efficiency associated with the CQI index.
In a forty-second aspect, alone or in combination with one or more of the twenty-fifth aspect through the forty-first aspect, wherein the comparison compares the CQI relationship of a wideband CQI indication against one or more threshold values across all frequency bands.
A forty-third aspect configured for wireless communication includes means for receiving, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI; means for determining, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type; and means for receiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
In a forty-fourth aspect, alone or in combination with the forty-third aspect, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis type, a multi-resource CSI hypothesis type, or both.
In a forty-fifth aspect, alone or in combination with one or more of the forty-third aspect or the forty-fourth aspect, wherein the indication of the CSI hypothesis type includes a mode indicator identifying the CSI hypothesis type, and wherein the PMI type to be included in the second CSI report part corresponds to the CSI hypothesis type identified by the mode indicator.
In a forty-sixth aspect, alone or in combination with one or more of the forty-third aspect through the forty-fifth aspect, wherein the indication of the CSI hypothesis type includes an additional codepoint of a CRI field of the first CSI report part, and wherein the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a PMI resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and the PMI resource the multi-resource PMI is associated with
In a forty-seventh aspect, alone or in combination with one or more of the forty-third aspect through the forty-sixth aspect, wherein the indication of the CSI hypothesis type includes an additional codepoint of a RI field of the first CSI report part, and wherein the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and the rank of the multi-resource PMI.
In a forty-eighth aspect, alone or in combination with one or more of the forty-third aspect through the forty-seventh aspect, wherein the indication of the CSI hypothesis type includes an additional codepoint of a joint CRI of the first CSI report part, and wherein the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both.
A forty-ninth aspect including a non-transitory computer-readable medium having program code recorded thereon, the program code includes program code executable by a computer for causing the computer to determine, by a UE, to prepare a CSI report according to a predetermined CSI report configuration; program code executable by the computer for causing the computer to determine, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-RS resource with a single TCI state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both; program code executable by the computer for causing the computer to transmit, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CRI, and at least one RI; and program code executable by the computer for causing the computer to transmit, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one PMI.
In a fiftieth aspect, alone or in combination with the forty-ninth aspect, wherein the indication includes a mode indicator that explicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a fifty-first aspect, alone or in combination with one or more of the forty-ninth aspect or the fiftieth aspect, wherein the first CSI report part includes the mode indicator, a single resource CRI, a multi-resource CRI, a single resource RI, and a multi-resource RI, and wherein the second CSI report part includes one of: an single resource PMI and two multi-resource PMIs associated with a first value of the mode indicator indicating the CSI hypothesis type is both, the single resource PMI associated with a second value of the mode indicator indicating the CSI hypothesis type is the single resource CSI hypothesis, and the multi-resource PMI associated with a third value of the mode indicator indicating the CSI hypothesis type is the multi-resource CSI hypothesis.
In a fifty-second aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-first aspect, wherein the indication includes an additional codepoint in a CRI field that implicitly identifies the CSI hypothesis type in the second CSI report part is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a fifty-third aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-second aspect, wherein the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a CSI-RS resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and multiple CSI-RS resources the multi-resource PMI is associated with, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value, the single resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the first multi-resource CRI value, and the multi-resource PMI associated with the multi-resource CRI indication being the first single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value.
In a fifty-fourth aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-fifth aspect, wherein the indication includes an additional codepoint in an RI field that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a fifty-fifth aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-fourth aspect, wherein the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and ranks of the multi-resource PMI, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the second multi-resource RI value, the single resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the first multi-resource RI value, and the multi-resource PMI associated with the multi-resource RI indication being the first single resource RI value and the multi-resource RI indication being the second multi-resource RI value.
In a fifty-sixth aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-fifth aspect, wherein the indication includes a joint CRI indicator that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
In a fifty-seventh aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-sixth aspect, wherein the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both, and wherein the second CSI report part includes one of: the single resource PMI and the multi-resource PMI associated with the joint CRI indication being the first joint CRI value, the multi-resource PMI associated with the joint CRI indication being the second joint CRI value, and the single resource PMI associated with the joint CRI indication being the third value.
In a fifty-eighth aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-seventh aspect, wherein the program code executable by the computer for causing the computer to determine the CSI hypothesis type includes: program code executable by the computer for causing the computer to determine a comparison of a CQI relationship of a single resource CQI indication of the single resource CSI hypothesis and a multi-resource CQI indication of the multi-resource CSI hypothesis against one or more threshold values; and program code executable by the computer for causing the computer to select the CSI hypothesis type based on a result of the comparison.
In a fifty-ninth aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-eighth aspect, wherein the one or more threshold values includes a single threshold value, wherein the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and wherein the program code executable by the computer for causing the computer to select the CSI hypothesis type includes one of: program code executable by the computer for causing the computer to select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; program code executable by the computer for causing the computer to select one of the single resource CSI hypothesis or both the single resource CSI hypothesis and the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
In a sixtieth aspect, alone or in combination with one or more of the forty-ninth aspect through the fifty-ninth aspect, further including: program code executable by the computer for causing the computer to obtain a CSI reporting indicator identifying one of the single resource CSI hypothesis or both for reporting, wherein the one of the single resource CSI hypothesis or both is selected according to the CSI reporting indicator in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
In a sixty-first aspect, alone or in combination with one or more of the forty-ninth aspect through the sixtieth aspect, wherein the CSI reporting indicator is obtained via one of: a predefined configuration at the UE or a system information message received from a neighboring base station.
In a sixty-second aspect, alone or in combination with one or more of the forty-ninth aspect through the sixty-first aspect, wherein the one or more threshold values includes a single threshold value, wherein the comparison includes: the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the single threshold value, and wherein the program code executable by the computer for causing the computer to select the CSI hypothesis type includes one of: program code executable by the computer for causing the computer to select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value; program code executable by the computer for causing the computer to select the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the single threshold value; or program code executable by the computer for causing the computer to select both in response to the comparison failing to satisfy the single threshold value.
In a sixty-third aspect, alone or in combination with one or more of the forty-ninth aspect through the sixty-second aspect, wherein the one or more threshold values includes a first threshold value and a second threshold value, wherein the comparison includes: the multi- resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the first threshold value, and the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the second threshold value, and wherein the program code executable by the computer for causing the computer to select the CSI hypothesis type includes one of: program code executable by the computer for causing the computer to select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the first threshold value; program code executable by the computer for causing the computer to select the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the second threshold value; or program code executable by the computer for causing the computer to select both in response to the comparison failing to satisfy each of the first threshold value and the second threshold value.
In a sixty-fourth aspect, alone or in combination with one or more of the forty-ninth aspect through the sixty-third aspect, further including program code executable by the computer for causing the computer to obtain, by the UE, the one or more threshold values via one of: one or more predefined threshold values at the UE or a CSI reporting configuration message received via a neighboring base station.
In a sixty-fifth aspect, alone or in combination with one or more of the forty-ninth aspect through the sixty-fourth aspect, wherein the multi-resource CQI indication and the single resource CQI indication include one of: a CQI index, or a spectral efficiency associated with the CQI index.
In a sixty-sixth aspect, alone or in combination with one or more of the forty-ninth aspect through the sixty-fifth aspect, wherein the comparison compares the CQI relationship of a wideband CQI indication against one or more threshold values across all frequency bands.
A sixty-seventh aspect including non-transitory computer-readable medium having program code recorded thereon, the program code includes program code executable by a computer for causing the computer to receive, by a base station, a first CSI report part of a CSI report from a served UE, wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CRI, and at least one RI; program code executable by the computer for causing the computer to determine, by the base station, using the indication of the CSI hypothesis type, a PMI type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type; and program code executable by the computer for causing the computer to receive, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
In a sixty-eighth aspect, alone or in combination with the sixty-seventh aspect, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis type, a multi-resource CSI hypothesis type, or both.
In a sixty-ninth aspect, alone or in combination with one or more of the sixty-seventh aspect or the sixty-eighth aspect, wherein the indication of the CSI hypothesis type includes a mode indicator identifying the CSI hypothesis type, and wherein the PMI type to be included in the second CSI report part corresponds to the CSI hypothesis type identified by the mode indicator.
In a seventieth aspect, alone or in combination with one or more of the sixty-seventh aspect through the sixty-ninth aspect, wherein the indication of the CSI hypothesis type includes an additional codepoint of a CRI field of the first CSI report part, and wherein the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a PMI resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and the PMI resource the multi-resource PMI is associated with.
In a seventy-first aspect, alone or in combination with one or more of the sixty-seventh aspect through the seventieth aspect, wherein the indication of the CSI hypothesis type includes an additional codepoint of a RI field of the first CSI report part, andwherein the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and the rank of the multi-resource PMI.
In a seventy-second aspect, alone or in combination with one or more of the sixty-seventh aspect through the seventy-first aspect, wherein the indication of the CSI hypothesis type includes an additional codepoint of a joint CRI of the first CSI report part, and wherein the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both.
The various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein may be implemented or performed 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, 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 conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., 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.
The steps of a method or algorithm described in connection with the disclosure herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, a connection may be properly termed 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, or digital subscriber line (DSL) , then the coaxial cable, fiber optic cable, twisted pair, or DSL, are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
As used herein, including in the claims, the term “and/or, ” when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed. For example, if a composition is described as containing components A, B, and/or C, the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination. Also, as used herein, including in the claims, “or” as used in a list of items prefaced by “at least one of” indicates a disjunctive list such that, for example, a list of “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) or any of these in any combination thereof.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
WHAT IS CLAIMED IS:
Claims (48)
- A method of wireless communication, comprising:determining, by a user equipment (UE) , to prepare a channel state information (CSI) report according to a predetermined CSI report configuration;determining, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-reference signal (CSI-RS) resource with a single transmission configuration indication (TCI) state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both;transmitting, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CSI-reference signal (CSI-RS) resource indicator (CRI) , and at least one rank indicator (RI) ; andtransmitting, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one precoding matrix indicator (PMI) .
- The method of claim 1, wherein the indication includes a mode indicator that explicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- The method of claim 2, wherein:the first CSI report part includes the mode indicator, a single resource CRI, a multi-resource CRI, a single resource RI, and a multi-resource RI, andthe second CSI report part includes one of:an single resource PMI and two multi-resource PMIs associated with a first value of the mode indicator indicating the CSI hypothesis type is both,the single resource PMI associated with a second value of the mode indicator indicating the CSI hypothesis type is the single resource CSI hypothesis, andthe multi-resource PMI associated with a third value of the mode indicator indicating the CSI hypothesis type is the multi-resource CSI hypothesis.
- The method of claim 1, wherein the indication includes an additional codepoint in a CRI field that implicitly identifies the CSI hypothesis type in the second CSI report part is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- The method of claim 4, wherein:the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a CSI-RS resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and multiple CSI-RS resources the multi-resource PMI is associated with, andthe second CSI report part includes one of:the single resource PMI and the multi-resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value,the single resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the first multi-resource CRI value, andthe multi-resource PMI associated with the multi-resource CRI indication being the first single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value.
- The method of claim 1, wherein the indication includes an additional codepoint in an RI field that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- The method of claim 6, wherein:the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and ranks of the multi-resource PMI, andthe second CSI report part includes one of:the single resource PMI and the multi-resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the second multi-resource RI value,the single resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the first multi-resource RI value, andthe multi-resource PMI associated with the multi-resource RI indication being the first single resource RI value and the multi-resource RI indication being the second multi-resource RI value.
- The method of claim 1, wherein the indication includes a joint CRI indicator that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- The method of claim 8, wherein:the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both, andthe second CSI report part includes one of:the single resource PMI and the multi-resource PMI associated with the joint CRI indication being the first joint CRI value,the multi-resource PMI associated with the joint CRI indication being the second joint CRI value, andthe single resource PMI associated with the joint CRI indication being the third value.
- The method of claim 1, wherein the determining the CSI hypothesis type includes:determining a comparison of a channel quality indicator (CQI) relationship of a single resource CQI indication of the single resource CSI hypothesis and a multi-resource CQI indication of the multi-resource CSI hypothesis against one or more threshold values; andselecting the CSI hypothesis type based on a result of the comparison.
- The method of claim 10,wherein the one or more threshold values includes a single threshold value,wherein the comparison includes:the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, andwherein the selecting the CSI hypothesis type includes one of:selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value;selecting one of the single resource CSI hypothesis or both the single resource CSI hypothesis and the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- The method of claim 11, further including:obtaining a CSI reporting indicator identifying one of the single resource CSI hypothesis or both for reporting, wherein the one of the single resource CSI hypothesis or both is selected according to the CSI reporting indicator in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- The method of claim 12, wherein the CSI reporting indicator is obtained via one of: a predefined configuration at the UE or a system information message received from a neighboring base station.
- The method of claim 10,wherein the one or more threshold values includes a single threshold value,wherein the comparison includes:the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, andthe single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the single threshold value, andwherein the selecting the CSI hypothesis type includes one of:selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value;selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the single threshold valueselecting both in response to the comparison failing to satisfy the single threshold value.
- The method of claim 10,wherein the one or more threshold values includes a first threshold value and a second threshold value,wherein the comparison includes:the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the first threshold value, andthe single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the second threshold value, andwherein the selecting the CSI hypothesis type includes one of:selecting the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the first threshold value;selecting the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the second threshold valueselecting both in response to the comparison failing to satisfy each of the first threshold value and the second threshold value.
- The method of claim 10, further including:obtaining, by the UE, the one or more threshold values via one of: one or more predefined threshold values at the UE or a CSI reporting configuration message received via a neighboring base station.
- The method of claim 10, wherein the multi-resource CQI indication and the single resource CQI indication include one of:a CQI index, ora spectral efficiency associated with the CQI index.
- The method of claim 10, wherein the comparison compares the CQI relationship of a wideband CQI indication against one or more threshold values across all frequency bands.
- A method of wireless communication, comprising:receiving, by a base station, a first channel state information (CSI) report part of a CSI report from a served user equipment (UE) , wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CSI-reference signal (CSI-RS) resource indicator (CRI) , and at least one rank indicator (RI) ;determining, by the base station, using the indication of the CSI hypothesis type, a precoding matrix indicator (PMI) type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type; andreceiving, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- The method of claim 19, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis type, a multi-resource CSI hypothesis type, or both.
- The method of claim 20,wherein the indication of the CSI hypothesis type includes a mode indicator identifying the CSI hypothesis type, andwherein the PMI type to be included in the second CSI report part corresponds to the CSI hypothesis type identified by the mode indicator.
- The method of claim 20,wherein the indication of the CSI hypothesis type includes an additional codepoint of a CRI field of the first CSI report part, andwherein the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a PMI resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and the PMI resource the multi-resource PMI is associated with
- The method of claim 20,wherein the indication of the CSI hypothesis type includes an additional codepoint of a RI field of the first CSI report part, andwherein the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and the rank of the multi-resource PMI.
- The method of claim 20,wherein the indication of the CSI hypothesis type includes an additional codepoint of a joint CRI of the first CSI report part, andwherein the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both.
- An apparatus configured for wireless communication, the apparatus comprising:at least one processor; anda memory coupled to the at least one processor,wherein the at least one processor is configured:to determine, by a user equipment (UE) , to prepare a channel state information (CSI) report according to a predetermined CSI report configuration;to determine, by the UE, a CSI hypothesis type to report in the CSI report, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis, wherein the single resource CSI hypothesis includes a CSI hypothesis associated with a single CSI-reference signal (CSI-RS) resource with a single transmission configuration indication (TCI) state, a multi-resource CSI hypothesis, wherein the multi-resource CSI hypothesis includes the CSI hypothesis associated with a pair of CSI-RS resources with different TCI states, or both;to transmit, by the UE, a first CSI report part of the CSI report, wherein the first CSI report part, determined according to the CSI hypothesis type, includes an indication of the CSI hypothesis type, at least one CSI-reference signal (CSI-RS) resource indicator (CRI) , and at least one rank indicator (RI) ; andto transmit, by the UE, a second CSI report part of the CSI report, wherein the second CSI report part, determined according to the CSI hypothesis type, includes at least one precoding matrix indicator (PMI) .
- The apparatus of claim 25, wherein the indication includes a mode indicator that explicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- The apparatus of claim 26, wherein:the first CSI report part includes the mode indicator, a single resource CRI, a multi-resource CRI, a single resource RI, and a multi-resource RI, andthe second CSI report part includes one of:an single resource PMI and two multi-resource PMIs associated with a first value of the mode indicator indicating the CSI hypothesis type is both,the single resource PMI associated with a second value of the mode indicator indicating the CSI hypothesis type is the single resource CSI hypothesis, andthe multi-resource PMI associated with a third value of the mode indicator indicating the CSI hypothesis type is the multi-resource CSI hypothesis.
- The apparatus of claim 25, wherein the indication includes an additional codepoint in a CRI field that implicitly identifies the CSI hypothesis type in the second CSI report part is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- The apparatus of claim 28, wherein:the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a CSI-RS resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and multiple CSI-RS resources the multi-resource PMI is associated with, andthe second CSI report part includes one of:the single resource PMI and the multi-resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value,the single resource PMI associated with the single resource CRI indication being the second single resource CRI value and the multi-resource CRI indication being the first multi-resource CRI value, andthe multi-resource PMI associated with the multi-resource CRI indication being the first single resource CRI value and the multi-resource CRI indication being the second multi-resource CRI value.
- The apparatus of claim 25, wherein the indication includes an additional codepoint in an RI field that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- The apparatus of claim 30, wherein:the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and ranks of the multi-resource PMI, andthe second CSI report part includes one of:the single resource PMI and the multi-resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the second multi-resource RI value,the single resource PMI associated with the single resource RI indication being the second single resource RI value and the multi-resource RI indication being the first multi-resource RI value, andthe multi-resource PMI associated with the multi-resource RI indication being the first single resource RI value and the multi-resource RI indication being the second multi-resource RI value.
- The apparatus of claim 25, wherein the indication includes a joint CRI indicator that implicitly identifies the CSI hypothesis type in the second CSI report is one of: the single resource CSI hypothesis, the multi-resource CSI hypothesis, or both.
- The apparatus of claim 32, wherein:the first CSI report part includes a joint CRI indication, a single resource RI, a multi-resource RI, wherein a first joint CRI value of the joint CRI indication identifies the single resource PMI is included in the second CSI report part, a second joint CRI value of the joint CRI indication identifies a multi-resource PMI is included in the second CSI report part; and a third joint CRI value of the joint CRI indication identifies the both, andthe second CSI report part includes one of:the single resource PMI and the multi-resource PMI associated with the joint CRI indication being the first joint CRI value,the multi-resource PMI associated with the joint CRI indication being the second joint CRI value, andthe single resource PMI associated with the joint CRI indication being the third value.
- The apparatus of claim 25, wherein the configuration of the at least one processor to determine the CSI hypothesis type includes configuration of the at least one processor:to determine a comparison of a channel quality indicator (CQI) relationship of a single resource CQI indication of the single resource CSI hypothesis and a multi-resource CQI indication of the multi-resource CSI hypothesis against one or more threshold values; andto select the CSI hypothesis type based on a result of the comparison.
- The apparatus of claim 34,wherein the one or more threshold values includes a single threshold value,wherein the comparison includes:the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, andwherein the configuration of the at least one processor to select the CSI hypothesis type includes configuration of the at least one processor to one of:select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value;select one of the single resource CSI hypothesis or both the single resource CSI hypothesis and the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- The apparatus of claim 35, further including configuration of the at least one processor to obtain a CSI reporting indicator identifying one of the single resource CSI hypothesis or both for reporting, wherein the one of the single resource CSI hypothesis or both is selected according to the CSI reporting indicator in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis failing to satisfy the single threshold value.
- [Rectified under Rule 91, 16.04.2021]
The apparatus of claim 36, wherein the CSI reporting indicator is obtained via one of: a predefined configuration at the UE or a system information message received from a neighboring base station. - The apparatus of claim 34,wherein the one or more threshold values includes a single threshold value,wherein the comparison includes:the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the single threshold value, andthe single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the single threshold value, andwherein the configuration of the at least one processor to select the CSI hypothesis type includes configuration of the at least one processor to one of:select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the single threshold value;select the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the single threshold valueselect both in response to the comparison failing to satisfy the single threshold value.
- The apparatus of claim 34,wherein the one or more threshold values includes a first threshold value and a second threshold value,wherein the comparison includes:the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis > the first threshold value, andthe single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis > the second threshold value, andwherein the configuration of the at least one processor to select the CSI hypothesis type includes configuration of the at least one processor to one of:select the multi-resource CSI hypothesis in response to the multi-resource CQI indication of the multi-resource CSI hypothesis minus the single resource CQI indication of the single resource CSI hypothesis satisfying the first threshold value;select the single resource CSI hypothesis in response to the single resource CQI indication of the single resource CSI hypothesis minus the multi-resource CQI indication of the multi-resource CSI hypothesis satisfying the second threshold valueselect both in response to the comparison failing to satisfy each of the first threshold value and the second threshold value.
- The apparatus of claim 34, further including configuration of the at least one processor to obtain, by the UE, the one or more threshold values via one of: one or more predefined threshold values at the UE or a CSI reporting configuration message received via a neighboring base station.
- The apparatus of claim 34, wherein the multi-resource CQI indication and the single resource CQI indication include one of:a CQI index, ora spectral efficiency associated with the CQI index.
- The apparatus of claim 34, wherein the comparison compares the CQI relationship of a wideband CQI indication against one or more threshold values across all frequency bands.
- An apparatus configured for wireless communication, the apparatus comprising:at least one processor; anda memory coupled to the at least one processor,wherein the at least one processor is configured:to receive, by a base station, a first channel state information (CSI) report part of a CSI report from a served user equipment (UE) , wherein the first CSI report part includes an indication of a CSI hypothesis type, at least one CSI-reference signal (CSI-RS) resource indicator (CRI) , and at least one rank indicator (RI) ;to determine, by the base station, using the indication of the CSI hypothesis type, a precoding matrix indicator (PMI) type to be included in a second CSI report part along with a set of transmission resources for transmission of at least one PMI of the PMI type; andto receive, by the base station, the second CSI report part of the CSI report including at least one PMI transmitted using the set of transmission resources, wherein the at least one PMI corresponds to the PMI type indicated by the indication of CSI hypothesis type.
- The apparatus of claim 43, wherein the CSI hypothesis type includes one of: a single resource CSI hypothesis type, a multi-resource CSI hypothesis type, or both.
- The apparatus of claim 44,wherein the indication of the CSI hypothesis type includes a mode indicator identifying the CSI hypothesis type, andwherein the PMI type to be included in the second CSI report part corresponds to the CSI hypothesis type identified by the mode indicator.
- The apparatus of claim 44,wherein the indication of the CSI hypothesis type includes an additional codepoint of a CRI field of the first CSI report part, andwherein the first CSI report part includes a single resource RI, a multi-resource RI, a single resource CRI indication, wherein a first single resource CRI value of the single resource CRI indication identifies no single resource PMI is included in the second CSI report part and a second single resource CRI value of the single resource CRI indication identifies a single resource PMI is included in the second CSI report part and a PMI resource the single resource PMI is associated with, and a multi-resource CRI indication, wherein a first multi-resource CRI value of the multi-resource CRI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource CRI value of the multi-resource CRI indication identifies a multi-resource PMI is included in the second CSI report part and the PMI resource the multi-resource PMI is associated with
- The apparatus of claim 44,wherein the indication of the CSI hypothesis type includes an additional codepoint of a RI field of the first CSI report part, andwherein the first CSI report part includes a single resource CRI, a multi-resource CRI, a single resource RI indication, wherein a first single resource RI value of the single resource RI indication identifies no single resource PMI is included in the second CSI report part and a second single resource RI value of the single resource RI indication identifies a single resource PMI is included in the second CSI report part and a rank of the single resource PMI, and a multi-resource RI indication, wherein a first multi-resource RI value of the multi-resource RI indication identifies no multi-resource PMI is included in the second CSI report part and a second multi-resource RI value of the multi-resource RI indication identifies a multi-resource PMI is included in the second CSI report part and the rank of the multi-resource PMI.
- The apparatus of claim 44,wherein the indication of the CSI hypothesis type includes an additional codepoint of a joint CRI of the first CSI report part, and
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