Reliable indication of the value of a control format indicator

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In certain aspects, a user equipment (UE) receives a value of a first control format indicator (CFI) in a message not carried by a physical control format indicator channel (PCFICH); it can be determined whether the UE is operating using at least one of a first configuration that is to use the value of the first CFI or a second configuration that is to use the value of the second CFI indicated in the PCFICH; and it can be based at least in part on determining whether the UE is operating using at least one of the first configuration or the second configuration, to use at least one of the value of the first CFI or the value of the second CFI to operate. Many other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS 35 U.S.C. § 119

[0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 653,124, filed on April 5, 2018, entitled “TECHNIQUES AND APPARATUSES FOR RELIABLE INDICATION OF A CONTROL FORMAT INDICATOR VALUE,” and U.S. Provisional Patent Application No. 16 / 370,672, filed on March 29, 2019, entitled “RELIABLE INDICATION OF A CONTROLFORMAT INDICATOR VALUE,” which are expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications, and more particularly to techniques and apparatus for reliable indication of the value of a control format indicator (CFI). Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth and / or transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a collection of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0005] A wireless communication network may include multiple base stations (BS) that may support communications for multiple user devices (UEs). A user device (UE) may communicate with a base station (BS) via a downlink and an uplink. A downlink (or forward link) refers to a communication link from a BS to a UE, and an uplink (or reverse link) refers to a communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, and / or 5G Node B, etc.

[0006] The above-mentioned multiple access technologies have been adopted by various telecommunication standards to provide a common protocol that enables different user devices to communicate at municipal, national, regional and even global levels. New Radio (NR), which may also be referred to as 5G, is a collection of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to better support mobile broadband Internet access. However, as the demand for mobile broadband access continues to increase, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0007] In certain aspects, a method of wireless communication performed by a user equipment (UE) may include receiving a value of a control format indicator (CFI) in a radio resource control (RRC) message or a system information block (SIB); and using the value of the CFI received in the RRC message or SIB without regard to the configuration in which the UE is operating.

[0008] In certain aspects, a user device for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to receive a value of a CFI in an RRC message or SIB; and use the value of the CFI received in the RRC message or SIB without regard to the configuration in which the UE is operating.

[0009] In certain aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a user device, the one or more processors may be caused to receive a value of a CFI in an RRC message or SIB; and use the value of the CFI received in the RRC message or SIB without regard to the configuration in which the UE is operating.

[0010] In certain aspects, an apparatus for wireless communication may include: means for receiving a value for a CFI in an RRC message or SIB; and means for using the value for the CFI received in the RRC message or SIB regardless of the configuration in which the apparatus is operating.

[0011] In certain aspects, a method of wireless communication performed by a UE may include: receiving a value of a first CFI in a message not carried by a physical control format indicator channel (PCFICH); determining whether the UE is operating using at least one of a first configuration in which the value of the first CFI is to be used or a second configuration in which the value of a second CFI indicated in the PCFICH is to be used; and operating using at least one of the value of the first CFI or the value of the second CFI based at least in part on determining whether the UE is operating using at least one of the first configuration or the second configuration.

[0012] In certain aspects, a user device for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to receive a value of a first CFI in a message not carried by a PCFICH; determine whether the UE is operating using at least one of a first configuration to use the value of the first CFI or a second configuration to use the value of a second CFI indicated in the PCFICH; and operate using at least one of the value of the first CFI or the value of the second CFI based at least in part on determining whether the UE is operating using at least one of the first configuration or the second configuration.

[0013] In certain aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a user device, the one or more processors may receive a value of a first CFI in a message not carried by a PCFICH; determine whether the UE is operating using at least one of a first configuration that is to use the value of the first CFI or a second configuration that is to use the value of a second CFI indicated in the PCFICH; and operate using at least one of the value of the first CFI or the value of the second CFI based at least in part on determining whether the UE is operating using at least one of the first configuration or the second configuration.

[0014] In certain aspects, an apparatus for wireless communication may include: components for receiving a value of a first CFI in a message not carried by a PCFICH; components for determining whether a UE is operating using at least one of a first configuration in which the value of the first CFI is to be used or a second configuration in which the value of a second CFI is to be used indicated in the PCFICH; and components for operating using at least one of the value of the first CFI or the value of the second CFI based at least in part on determining whether the UE is operating using at least one of the first configuration or the second configuration.

[0015] In certain aspects, a method of wireless communication performed by a UE may include: receiving in a message an indication of a first set of subframes to which a first CFI value is to be applied; receiving in the message an indication of a second set of subframes to which a second CFI value is to be applied; and selectively using the first CFI value or the second CFI value for the subframe based at least in part on whether the subframe is included in the first set of subframes or in the second set of subframes.

[0016] In certain aspects, a user device for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to receive in a message an indication of a first set of subframes to which a value of a first CFI is to be applied; receive in the message an indication of a second set of subframes to which a value of a second CFI is to be applied; and selectively use the value of the first CFI or the value of the second CFI for a subframe based at least in part on whether the subframe is included in the first set of subframes or in the second set of subframes.

[0017] In certain aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a user device, may cause the one or more processors to receive in a message an indication of a first set of subframes to which a value of a first CFI is to be applied; receive in the message an indication of a second set of subframes to which a value of a second CFI is to be applied; and selectively use the value of the first CFI or the value of the second CFI for a subframe based at least in part on whether the subframe is included in the first set of subframes or in the second set of subframes.

[0018] In certain aspects, an apparatus for wireless communication may include: components for receiving in a message an indication of a first set of subframes to which a first CFI value is to be applied; components for receiving in the message an indication of a second set of subframes to which a second CFI value is to be applied; and components for selectively using the first CFI value or the second CFI value for the subframe based at least in part on whether the subframe is included in the first set of subframes or in the second set of subframes.

[0019] Aspects generally include methods, apparatus, systems computer program products, non-transitory computer readable media, user equipment, base stations, wireless communication devices, and processing systems as substantially described herein with reference to and as illustrated by the accompanying drawings and description.

[0020] The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and methods of operation, and related advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to be able to understand the above features of the present invention in detail, the above brief summary may be described in more detail with reference to certain aspects shown in the accompanying drawings. However, it is worth noting that the attached drawings only illustrate certain typical aspects of the present disclosure and should not be considered to limit its scope, as the specification may allow other equally effective aspects. The same reference symbols in different figures may identify the same or similar elements.

[0022] Figure 1 is a block diagram conceptually illustrating an example in a wireless communication network according to various aspects of the present disclosure.

[0023] Figure 2 is a block diagram conceptually illustrating an example of a base station communicating with a user equipment (UE) in a wireless communication network according to various aspects of the present disclosure.

[0024] Figure 3A is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network in accordance with various aspects of the present disclosure.

[0025] Figure 3B is a block diagram conceptually illustrating an example synchronous communication hierarchy in a wireless communication network in accordance with various aspects of the present disclosure.

[0026] Figure 4 is a block diagram conceptually illustrating an example subframe format with a normal cyclic prefix in accordance with various aspects of the present disclosure.

[0027] Figure 5 is a diagram illustrating example subframe formats corresponding to different control format indicator (CFI) values ​​according to various aspects of the present disclosure.

[0028] Figures 6 to 8 is a diagram illustrating an example of a reliable indication of a value of a CFI in accordance with various aspects of the present disclosure.

[0029] Figures 9 to 11is a diagram illustrating an example process performed, for example, by a user device, according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0030] Various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether independent of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such a device or method, which is practiced using other structures, functions, or structures and functions other than or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be embodied by one or more elements of the claims.

[0031] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes and / or algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0032] It should be noted that although common terms typically associated with 3G and / or 4G wireless technologies may be used to describe various aspects herein, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and beyond, including NR technologies.

[0033] Figure 11 is a diagram illustrating a network 100 in which various aspects of the present disclosure may be practiced. The network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include a plurality of BSs 110 (shown as BS110a, BS 110b, BS110c, and BS110d) and other network entities. A BS is an entity that communicates with a user device (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, and / or transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, depending on the context in which the term "cell" is used, the term may refer to the coverage of a BS and / or a BS subsystem serving the coverage.

[0034] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a micro BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0035] In some aspects, the cell may not necessarily be fixed, and the geographical area of ​​the cell may move according to the location of the mobile BS. In some aspects, the BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the access network 100 through various types of backhaul interfaces (such as direct physical connections and / or virtual networks, etc.) using any suitable transport network.

[0036] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and transmit the transmissions of data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, a relay station 110d may communicate with the macro BS 110a and the UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, and / or a relay, etc.

[0037] The wireless network 100 may be a heterogeneous network including different types of BSs, such as macro BSs, pico BSs, femto BSs, and / or relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0038] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0039] UE 120 (e.g., 120a, 120b, 120c) can be dispersed in the wireless network 100, and each UE can be fixed or mobile. UE can also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit and / or a station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) workstation, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or apparatus, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0040] Some UEs may be considered machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors and / or location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, a connection for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered customer premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120 (e.g., a processor component and / or a memory component, etc.).

[0041] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as a radio technology and / or air interface, etc. Frequency can also be referred to as a carrier and / or frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0042] In certain aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more side link channels (e.g., without using base station 110 as an intermediary for communicating with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols and / or vehicle-to-infrastructure (V2I) protocols, etc.), and / or mesh networks, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0043] As noted above, Figure 1 Provided as an example only. Other examples may be found in Figure 1 Different than described.

[0044] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1 Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0045] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) data for the UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and / or similar information) and control information (e.g., CQI requests, grants, and / or upper layer signaling, etc.) and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM and / or the like) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be used to generate synchronization signals to express additional information.

[0046] At the UE 120, antennas 252a to 252r may receive downlink signals from the base station 110 and / or other base stations, and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM and / or similar means) to obtain received symbols. The MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine, among other things, a reference signal received power (RSRP), a received signal strength indicator (RSSI), a reference signal received quality (RSRQ), and / or a channel quality indicator (CQI).

[0047] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM and / or CP-OFDM, etc.), and transmitted to the base station. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0048] In some aspects, one or more components of UE 120 may be included in a housing. The controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2Any other components of the UE 120 may perform one or more techniques associated with reliable indication of the value of the CFI, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the can perform or direct e.g. Fig. 9 The process of 900 Fig.10 The process of 1000 Fig.11 The operations of process 1100 and / or other processes described herein may be performed. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. Scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0049] In certain aspects, the UE 120 may include: means for receiving a value of a control format indicator (CFI) in a radio resource control (RRC) message or a system information block (SIB); and / or means for using the value of the CFI received in the RRC message or SIB without regard to the configuration in which the UE 120 is operating, etc. Additionally or alternatively, the UE 120 may include means for receiving a value of a first CFI in a message not carried over a physical control format indicator channel (PCFICH); means for determining whether the UE 120 is operating using at least one of a first configuration in which the value of the first CFI is to be used or a second configuration in which the value of the second CFI indicated in the PCFICH is to be used; and / or means for operating using at least one of the value of the first CFI or the value of the second CFI based at least in part on determining whether the UE 120 is operating using at least one of the first configuration or the second configuration, etc. Additionally or alternatively, UE 120 may include: a component for receiving in a message an indication of a first set of subframes to which a value of a first CFI is to be applied; and a component for receiving in a message an indication of a second set of subframes to which a value of a second CFI is to be applied; and a component for selectively using the value of the first CFI or the value of the second CFI for the subframe based at least in part on whether the subframe is included in the first set of subframes or in the second set of subframes. Additionally or alternatively, UE 120 may include: a component for receiving in a message not carried by a physical control format indicator channel (PCFICH) a value of a first CFI for one or more component carriers of UE 120; a component for determining whether one or more component carriers are operating using at least one of a first configuration in which the value of the first CFI is to be used or a second configuration in which the value of the second CFI is to be used indicated in the PCFICH; and / or a component for operating using at least one of the value of the first CFI or the value of the second CFI based at least in part on determining whether one or more component carriers are operating using at least one of the first configuration or the second configuration, etc. In some aspects, such components may include a combination of Figure 2 One or more components of UE 120 are described.

[0050] As noted above, Figure 2 Provided as an example only. Other examples may be found in Figure 2 Different than described.

[0051] Figure 3AAn example frame structure 300 for FDD in a telecommunication system (e.g., NR) is shown. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames. Each radio frame may have a predetermined duration and may be divided into a set of Z (Z ≥ 1) subframes (e.g., with indices from 0 to Z-1). Each subframe may include time slots (e.g., Figure 3A Each time slot may include a set of L symbol periods. For example, each time slot may include seven symbol periods (e.g., Figure 3A In some aspects, a subframe may include 14 symbols. In some aspects, a scheduling unit for FDD may be frame-based, subframe-based, slot-based, and / or symbol-based, etc.

[0052] Although certain techniques are described herein in connection with frames, subframes, and / or time slots, etc., these techniques may equally apply to other types of transmission time intervals (TTIs) or shortened TTIs (sTTIs), which may be referred to using terms other than "frames," "subframes," and / or "time slots," etc., as in 5G NR. In some aspects, a TTI may refer to a periodic, time-limited communication unit defined by a wireless communication standard and / or protocol. Additionally or alternatively, a TTI may be used in conjunction with Figure 3A The configurations shown in the figure are different TTI configurations, such as sTTI with a length that can be flexibly configured (e.g., 2 symbols and / or 3 symbols, etc.).

[0053] In some telecommunications (e.g., NR), a base station may send synchronization signals. For example, a base station may send a primary synchronization signal (PSS), and / or a secondary synchronization signal (SSS), etc., on a downlink for each cell supported by the base station. The UE may use the PSS and SSS for cell search and acquisition. For example, the UE may use the PSS to determine symbol timing, and the UE may use the SSS to determine a physical cell identifier associated with the base station and frame timing. The base station may also send a physical broadcast channel (PBCH). The PBCH may carry certain system information, such as system information that supports initial access by the UE. The base station may also send a physical control format indicator channel (PCFICH) to indicate a subframe format and / or subframe layout using a control format indicator (CFI), as described in more detail elsewhere herein.

[0054] In certain aspects, a base station may transmit a PSS, SSS, and / or PBCH according to a synchronization communication hierarchy (e.g., a synchronization signal (SS) hierarchy) including a plurality of synchronization communications (e.g., SS blocks), as described below in conjunction with Figure 3B as described.

[0055] Figure 3B is a block diagram conceptually illustrating an example SS hierarchy, which is an example of a synchronous communication hierarchy. Figure 3B As shown, the SS hierarchy may include an SS burst set, which may include multiple SS bursts (identified as SS burst 0 to SS burst B-1, where B is the maximum number of repetitions of the SS burst that can be sent by the base station). As further shown in the figure, each SS burst may include one or more SS blocks (identified as SS block 0 to SS block (b max_SS-1 ), where b max_SS-1 is the maximum number of SS blocks that can be carried by an SS burst. In some aspects, different SS blocks may be beamformed differently. As shown in FIG. 3B , an SS burst set may be sent by a wireless node periodically, such as once every X milliseconds. In some aspects, an SS burst set may have a fixed or dynamic length, Figure 3B Shown in Y milliseconds.

[0056] exist Figure 3B The SS burst set shown in is an example of a synchronous communication set, and other synchronous communication sets can be used in conjunction with the techniques described herein. Figure 3B The SS blocks shown in are examples of synchronous communications, and other synchronous communications may be used in conjunction with the techniques described herein.

[0057] In some aspects, an SS block includes resources that carry PSS, SSS, PBCH, and / or other synchronization signals (e.g., a third synchronization signal (TSS)) and / or synchronization channels. In some aspects, multiple SS blocks are included in an SS burst, and the PSS, SSS, and / or PBCH may be the same on each SS block of the SS burst. In some aspects, a single SS block may be included in an SS burst. In some aspects, the length of an SS block may be at least four symbol periods, where each symbol carries one or more of a PSS (e.g., occupying one symbol), a SSS (e.g., occupying one symbol), and / or a PBCH (e.g., occupying two symbols).

[0058] In some aspects, the symbols of the SS block are consecutive, such as Figure 3BAs shown. In some aspects, the symbols of the SS blocks are non-contiguous. Similarly, in some aspects, one or more SS blocks of an SS burst may be sent in contiguous radio resources (e.g., contiguous symbol periods) during one or more subframes. Additionally or alternatively, one or more SS blocks of an SS burst may be sent in non-contiguous radio resources.

[0059] In some aspects, the SS burst may have a burst periodicity, whereby the SS blocks of the SS burst are sent by the base station according to the burst periodicity. In other words, the SS blocks may be repeated during each SS burst. In some aspects, the SS burst set may have a burst set periodicity, whereby the SS bursts in the SS burst set are sent by the base station according to a fixed burst set periodicity. In other words, the SS burst may be repeated during each SS burst set.

[0060] The base station may send system information such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in certain subframes. The base station may send control information / data on a physical downlink control channel (PDCCH) in C symbol periods of a subframe, where B may be configurable for each subframe. The base station may send traffic data and / or other data on the PDSCH in the remaining symbol periods of each subframe.

[0061] As noted above, Figure 3A and 3B Provided as an example only. Other examples may be found in Figure 3A and 3B Different than described.

[0062] Figure 4 An example subframe format 410 with a conventional cyclic prefix is ​​shown. The available time-frequency resources may be divided into resource blocks. Each resource block may cover a set of subcarriers in a time slot (e.g., 12 subcarriers) and may include multiple resource elements. Each resource element may cover a subcarrier in a symbol period (e.g., in time) and may be used to send a modulation symbol, which may be a real value or a complex value. In certain aspects, as described herein, the subframe format 410 may be used for the transmission of SS blocks carrying PSS, SSS, and / or PBCH, etc.

[0063] Although various aspects of the examples described herein may be associated with NR or 5G technology, various aspects of the present disclosure may be applicable to other wireless communication systems. New Radio (NR) may refer to a radio configured to operate according to a new air interface (e.g., an air interface different from that based on Orthogonal Frequency Division Multiple Access (OFDMA)) or a fixed transport layer (e.g., different from the Internet Protocol (IP)). In various aspects, NR may utilize OFDM with CP (referred to herein as cyclic prefix OFDM or CP-OFDM) and / or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD. In various aspects, NR may utilize OFDM with CP (referred to herein as CP-OFDM) and / or discrete Fourier transform extended orthogonal frequency division multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD, for example. NR may include enhanced mobile broadband (eMBB) services for broadband (e.g., 80 megahertz (MHz) and above), millimeter wave (mmW) for high carrier frequencies (e.g., 60 gigahertz (GHz)), massive MTC (mMTC) for non-backward compatible MTC technologies, and / or mission critical ultra-reliable low latency communication (URLLC) services.

[0064] In certain aspects, a single component carrier bandwidth of 100 MHz may be supported. NR resource blocks may cover 12 subcarriers with a subcarrier bandwidth of 60 or 120 Hz (kHz) over a duration of 0.1 milliseconds (ms). Each radio frame may include 40 subframes having a length of 10 ms. Thus, each subframe may have a length of 0.25 ms. Each subframe may indicate a link direction (e.g., DL or UL) for data transmission, and the link direction for each subframe may be switched dynamically. Each subframe may include DL / UL data and DL / UL control data.

[0065] Beamforming can be supported and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. MIMO configuration in DL can support up to 8 transmit antennas, with up to 8 streams and up to 2 streams for each UE for multi-layer DL transmission. Multi-layer transmission with up to 2 streams for each UE can be supported. Up to 8 serving cells can support aggregation of multiple cells. Alternatively, in addition to the OFDM-based interface, NR can support different air interfaces. The NR network can include entities such as a central unit or a distributed unit.

[0066] As noted above, Figure 4 Provided as an example only. Other examples may be found in Figure 4Different than described.

[0067] Figure 5 is a diagram illustrating an example subframe format 500 corresponding to different control format indicator (CPI) values ​​in accordance with various aspects of the present disclosure.

[0068] like Figure 5 As shown, different CFI values ​​can be used to indicate different subframe formats (also referred to as subframe layouts and / or downlink layouts, etc.) to UE 120. For example, a CFI value of 1 (shown as CFI1) can indicate that the length of the first sTTI (shown as sTTI0) in the subframe is three symbols, the first symbol carries control information, and the second and third symbols carry data. Similarly, a CFI value of 2 (shown as CFI2) can indicate that the length of the first sTTI in the subframe is two symbols, and both symbols carry control information. Finally, a CFI value of 3 (shown as CFI3) can indicate that the length of the first sTTI in the subframe is three symbols, and all three symbols carry control information. Although the CFI value is shown as indicating different subframe layouts for sTTI configurations, the CFI value may additionally or alternatively indicate different subframe layouts for other configurations, such as TTI configurations, URLLC configurations, and / or eMBB configurations, etc.

[0069] UE 120 may use the value of CFI to identify the subframe format. For example, UE 120 may use the value of CFI to identify the pattern of time slots, TTIs, and / or sTTIs, etc. included in a subframe. Additionally or alternatively, UE 120 may use the value of CFI to identify multiple symbols included in different time slots, TTIs, and / or sTTIs, etc. of a subframe. Additionally or alternatively, UE 120 may use the value of CFI to identify one or more symbols (e.g., in the first three symbols of a subframe) that include control information. For example, when the value of CFI is 1, UE 120 may determine that only the first symbol of a subframe includes control information, when the value of CFI is 2, UE 120 may determine that only the first symbol and the second symbol of a subframe include control information, or when the value of CFI is 3, UE 120 may determine that only the first three symbols include control information. Similarly, UE 120 may use the value of CFI to identify one or more symbols (e.g., in the first three symbols of a subframe) that include data. UE 120 may correctly obtain control information and / or data based at least in part on the identified subframe format.

[0070] In some aspects, the value of the CFI may be indicated in a physical control format indicator channel (PCFICH) carrying the CFI. For example, the base station 110 may indicate the CFI in the PCFICH, and the UE 120 may decode the PCFICH to obtain the CFI. However, if the UE 120 incorrectly decodes the PCFICH, the UE 120 may determine the wrong subframe format, which may result in errors, increased delays, and / or reduced reliability, etc. Therefore, in some aspects, the base station 110 may indicate the value of the CFI to the UE 120 in a non-PCFICH message such as a radio resource control (RRC) message (e.g., an RRC configuration message using a dedicated RRC connection indication), and / or a system information block (SIB). In this way, the UE 120 may be more likely to obtain the correct CFI value and determine the correct subframe format, which may reduce errors, reduce delays, and / or increase reliability, etc. This can help meet the latency and / or reliability requirements for different configurations (such as URLLC configurations and / or similar configurations).

[0071] However, the UE 120 (e.g., a URLLC-capable UE) may operate using various configurations, such as a URLLC configuration, a non-URLLC configuration (e.g., an eMBB configuration and / or the like), an sTTI configuration, a TTI configuration (e.g., a traditional TTI configuration with a 1ms subframe), various carrier aggregation configurations, and / or the like. Therefore, the UE 120 may need to support 5G operations, 4G operations (e.g., traditional operations), and / or the like, which may involve decoding the PCFICH to obtain a value for the CFI. In addition, it may be necessary to flexibly configure the UE 120 for use with the CFI to support these various configurations. Certain techniques and apparatus described herein allow the UE 120 to be flexibly configured to use values ​​of the CFI received in different manners to provide full compatibility across various configurations and meet various requirements of different configurations.

[0072] As noted above, Figure 5 Provided as an example only. Other examples may be found in Figure 5 Different than described.

[0073] Figure 6 is a diagram illustrating an example 600 of a reliable indication of a value of a CFI in accordance with various aspects of the present disclosure.

[0074] As shown in reference numeral 610, the base station 110 may send a value of the CFI in a non-PCFICH message (such as a radio resource control (RRC) message (e.g., a UE-specific message), and / or a system information block (SIB) (e.g., a cell-specific message), etc.), and the UE 120 may receive a value of the CFI in a non-PCFICH message (such as a radio resource control (RRC) message (e.g., a UE-specific message), and / or a system information block (SIB) (e.g., a cell-specific message), etc.). Thus, in some aspects, the non-PCFICH message may be cell-specific (e.g., may be configured for each cell). In some aspects, the base station 110 may send a value of the CFI in a non-PCFICH message based at least in part on a determination that the UE 120 is configured to operate using a configuration (i.e., a value of the CFI to be used in a non-PCFICH message, such as a URLLC configuration, and / or an sTTI configuration, etc.), and the UE 120 may receive a value of the CFI in a non-PCFICH message. In certain aspects, if UE 120 is not configured with such a configuration (e.g., operating only using an eMBB configuration, and / or a legacy TTI configuration, etc.), base station 110 may not indicate a value of CFI in a non-PCFICH message, or if a value of CFI is indicated in a non-PCFICH message, UE 120 may not use the value of CFI in the non-PCFICH message.

[0075] As shown in reference numeral 620, the UE 120 may use the value of the CFI received in the non-PCFICH message regardless of the configuration that the UE 120 is using. For example, for a URFCC configuration, an eMBB configuration, a traditional TTI configuration, a 1 millisecond TTI configuration, an sTTI configuration, a configuration with a delay requirement that meets a threshold, a configuration with a reliability requirement that meets a threshold, a carrier aggregation configuration, and / or a dual connectivity configuration, etc., the UE 120 may use the value of the CFI received in the non-PCFICH message. In some aspects, an associated DCI format (such as DCI format 7-0x and 7-1x) may be used to reference the URLLC configuration and / or the sTTI configuration. Similarly, an associated DCI format (e.g., different from DCI format 7-0x and 7-1x) may be used to reference the eMBB configuration and / or the traditional TTI configuration. In some aspects, for all of these configurations, the UE 120 may use the value of the CFI received in the non-PCFICH message.

[0076] In some aspects, as described above Figure 5As described above, UE 120 may use the value of the CFI received in the non-PCFICH message to determine a subframe format (e.g., subframe layout and / or downlink layout, etc.). The subframe format may be used to communicate with base station 110, such as receiving downlink control information (DCI) (e.g., in the PDCCH), and / or receiving downlink data (e.g., in the PDSCH), etc. Additionally or alternatively, as described above in conjunction with Figure 5 As described, UE 120 may use the value of the CFI to identify one or more symbols including control information and / or data, and / or obtain control information and / or data.

[0077] As indicated by reference numeral 630, UE 120 may prevent decoding of the PCFICH based at least in part on receiving a value of the CFI in a non-PCFICH message. For example, because UE 120 uses the value of the CFI received in the non-PCFICH message for all configurations, UE 120 may not need to obtain the value of the CFI from the PCFICH (e.g., because the value of the CFI in the PCFICH will not be used for any configuration). In this manner, UE 120 may save resources of the UE that would otherwise be used to decode the PCFICH (e.g., memory, processing power, and / or battery power, etc.).

[0078] In certain aspects, if the base station 110 sends the value of the CFI in a non-PCFICH message, the base station 110 can refrain from sending the value of the CFI in the PCFICH. For example, if the base station 110 determines that the UE 120 will use the value of the CFI in the non-PCFICH message for all configurations of the UE, the base station 110 can refrain from sending the value of the CFI on the PCFICH (e.g., because such a value of the CFI on the PCFICH will not be used by the UE 120). In this manner, the base station 110 can save network resources and resources of the base station 110 (e.g., memory, and / or processing power, etc.).

[0079] In some aspects, the non-PCFICH message may include multiple CFI values, and the UE 120 may select a CFI value to use from the multiple CFI values. For example, the non-PCFICH message may include multiple CFI values, and each CFI value may correspond to a different subframe set, as described below in conjunction with Figure 7 and Figure 8 Described in more detail.

[0080] As noted above, Figure 6 Provided as an example only. Other examples may be found in Figure 6 Different than described.

[0081] Figure 7is a diagram illustrating another example 700 of a reliable indication of a value of a CFI in accordance with various aspects of the present disclosure.

[0082] As shown in reference numeral 710, the base station 110 may send the value of the first CFI in a non-PCFICH message (e.g., a message not carried by the PCFICH, such as an RRC message, and / or a SIB (e.g., a message carried in the SIB), etc.), and the UE 120 may receive the value of the first CFI in a non-PCFICH message (e.g., a message not carried by the PCFICH, such as an RRC message, and / or a SIB (e.g., a message carried in the SIB), etc.). As described above in conjunction with Figure 6 As described, in certain aspects, if UE 120 is configured to operate using a configuration (i.e., a value of CFI to be used in a non-PCFICH message, such as a URLLC configuration, and / or an sTTI configuration, etc.), the value of CFI can only be indicated in a non-PCFICH message (e.g., an RRC message).

[0083] In certain aspects, the non-PCFICH message may include multiple CFI values, and the UE 120 may select a first CFI value from the multiple CFI values. For example, the non-PCFICH message may include multiple CFI values, where each CFI value corresponds to a different subframe set. Each of the different subframe sets may include a set of mutually exclusive subframes. For example, the non-PCFICH message may indicate a CFI value to be used for a first subframe set, may indicate another CFI value to be used for a second subframe set, and so on. The UE 120 may determine whether a subframe in which the UE 120 is operating (e.g., a subframe in which the UE 120 needs a CFI value to determine the format of the subframe) belongs to a subframe set, and may identify the CFI value corresponding to the subframe set. The following is in conjunction with Figure 8 Provide additional details.

[0084] As indicated by reference numeral 720, UE 120 may determine whether the UE is operating using a first configuration that is to use a value of a first CFI and / or a second configuration that uses a value of a second CFI indicated in a PCFICH. In certain aspects, the first configuration may include, for example, a URLLC configuration, an sTTI configuration, a configuration with a delay requirement less than or equal to a threshold, a configuration with a reliability requirement greater than or equal to a threshold, and / or a configuration that configures all component carriers of UE 120 using a value of a CFI indicated in a non-PCFICH message, etc. Additionally or alternatively, the second configuration may include, for example, an eMBB configuration, a traditional TTI configuration, a configuration with a delay requirement greater than or equal to a threshold, a configuration with a reliability requirement less than or equal to a threshold, and / or a configuration that does not configure component carriers of UE 120 using a value of a CFI indicated in a non-PCFICH message (e.g., a configuration that configures all component carriers of UE 120 using a value of a CFI indicated in a PCFICH), etc.

[0085] In certain aspects, base station 110 may transmit the value of the second CFI in the PCFICH, as indicated by reference numeral 730. If UE 120 is operating using the second configuration, UE 120 may decode the PCFICH to obtain the value of the second CFI, as described in more detail below.

[0086] As indicated by reference numeral 740, UE 120 may operate using a value of the first CFI and / or a value of the second CFI based at least in part on determining whether the UE is operating using the first configuration and / or the second configuration. For example, if UE 120 is operating using only the first configuration, UE 120 may operate using only the value of the first CFI. Similarly, if UE 120 is operating using only the second configuration, UE 120 may operate using only the value of the second CFI. If UE 120 is operating using both the first configuration and the second configuration (e.g., simultaneously or concurrently), UE 120 may use the value of the first CFI for the first configuration (e.g., for communications using the first configuration) and may use the value of the second CFI for the second configuration (e.g., for communications using the second configuration).

[0087] In this way, the value of the first CFI indicated in the non-PCFICH message (e.g., which may be more reliable) can be used for configurations with high reliability requirements, and / or low latency requirements, etc. Conversely, the value of the second CFI indicated in the PCFICH message (e.g., which may be less reliable) can be used for configurations that do not have high reliability requirements, and / or low latency requirements, etc.

[0088] In certain aspects, if the UE 120 is operating using the first configuration instead of the second configuration, the UE 120 may prevent decoding of the PCFICH. In this case, since the second configuration is not used, the UE 120 may not need to use the value of the second CFI, and thus resources may be saved by preventing the PCFICH from being decoded. Conversely, if the UE 120 is operating using the second configuration (e.g., using the second configuration instead of the first configuration, or using both the second configuration and the first configuration), the UE 120 may decode the PCFICH (e.g., because the UE 120 may need the value of the second CFI to operate using the second configuration).

[0089] In some aspects, because if the value of the second CFI is greater than the value of the first CFI, the UE 120 may incorrectly interpret the control information (e.g., in the second and / or third symbols of the subframe) as data, the value of the second CFI must be less than or equal to the value of the first CFI (e.g., the value of the second CFI may be capped by the value of the first CFI). For example, if the value of the first CFI is 1, this may indicate that the first symbol of the subframe includes control information and the second and third symbols include data, such as URLLC data. However, if the value of the second CFI is 3, this may indicate that the first three symbols of the subframe include control information. Therefore, in this case, even if the information in the second and third symbols is control information, the UE 120 may incorrectly interpret the information in the second and third symbols as data. In this case, if the UE 120 receives a value of the second CFI (e.g., indicated in the PCFICH) that is greater than the value of the first CFI (e.g., indicated in a non-PCFICH message), the UE 120 may be configured to indicate an error.

[0090] In some aspects, if the value of the first CFI is 3, the value of the second CFI may be 1 or 3. In this case, the value of the second CFI may not be 2 because a CFI value of 2 indicates that the first sTTI of a subframe (e.g., sTTI0) includes two symbols, while a CFI value of 3 indicates that the first sTTI of a subframe includes three symbols, as described above in conjunction with Figure 5 In some aspects, if the value of the first CFI is 2, the value of the second CFI may be 2 (e.g., the value of the first CFI and the value of the second CFI may be the same). In this case, the value of the second CFI may not be 1, because a CFI value of 1 indicates that the first sTTI of the subframe includes three symbols, while a CFI value of 2 indicates that the first sTTI of the subframe includes two symbols, as described above in conjunction with Figure 5In some aspects, if the value of the first CFI is 1, the value of the second CFI may be 1 (eg, the value of the first CFI and the value of the second CFI may need to be the same). In this way, errors may be reduced, as described above.

[0091] In some aspects, one or more techniques described herein may be used when UE 120 is configured to use multiple component carriers (e.g., for carrier aggregation, and / or dual connectivity, etc.). In some aspects, such as when all component carriers have a first configuration (e.g., the first configuration may be a group bundling configuration of all component carriers in a bundling group), all component carriers of UE 120 may be configured using values ​​of one or more CFIs indicated in a non-PCFICH message. In this case, and in some aspects, all component carriers of UE 120 may be configured using the same CFI value (e.g., the value of the first CFI) included in the non-PCFICH message to simplify signaling and reduce overhead. Alternatively, in some aspects, different CFI values ​​indicated in the non-PCFICH message may be used to configure different component carriers of UE 120 to increase flexibility. In this case, the non-PCFICH message may include multiple CFI values, and the different CFI values ​​may correspond to different component carriers of UE 120.

[0092] Alternatively, for example, when all component carriers have a second configuration (e.g., the second configuration may be a group bundling configuration of all component carriers in a bundling group), all component carriers of UE 120 may be configured using the values ​​of one or more CFIs indicated in the PCFICH (e.g., and no component carrier may be configured using the values ​​of one or more CFIs indicated in a non-PCFICH message). In this case, and in some aspects, a single CFI value indicated in the PCFICH may be used for all (or multiple) component carriers to reduce overhead. Alternatively, in some aspects, base station 110 may indicate different CFI values ​​in the PCFICH, and different CFI values ​​may correspond to different component carriers, thereby increasing flexibility.

[0093] In certain aspects, a first set of component carriers of UE 120 may operate using a first configuration (e.g., as described above), and a second set of component carriers of UE 120 may operate using a second configuration (e.g., as described above). In this case, UE 120 may use a first set of values ​​of (e.g., one or more) CFIs indicated in a non-PCFICH message for the first set of component carriers, and may use a second set of values ​​of (e.g., one or more) CFIs indicated in a PCFICH for the second set of component carriers. In a similar manner as described above, UE 120 may use a single value of CFI for all component carriers in the first set, or may use different values ​​of CFI for different component carriers in the first set. Similarly, UE 120 may use a single value of CFI for all component carriers in the second set, or may use different values ​​of CFI for different component carriers in the second set. In this manner, flexibility across different component carriers may be increased.

[0094] In some aspects, a secondary cell (e.g., SCell) of UE 120 may be configured with a value of a CFI indicated in a non-PCFICH message (e.g., an RRC message) even if the secondary cell operates using the second configuration. In this case, UE 120 may be required to be configured with a value of another CFI indicated in the non-PCFICH message for use when the secondary cell operates using the first configuration. Therefore, the non-PCFICH message may indicate a value of a CFI for the first configuration of the secondary cell and a value of a CFI for the second configuration of the secondary cell, or may indicate a value of a CFI for the first configuration of the secondary cell without indicating a value of a CFI for the second configuration of the secondary cell, but may not indicate a value of a CFI for the second configuration of the secondary cell without indicating a value of a CFI for the first configuration of the secondary cell. In this case, if the secondary cell is configured with a value of a CFI for the second configuration via a non-PCFICH message, decoding of the PCFICH may be avoided entirely, thereby saving resources of UE 120.

[0095] By allowing the UE 120 to be flexibly configured to use the value of the first CFI in the non-PCFICH message for an operation using a first configuration (e.g., URFCC operation, and / or sTTI configuration, etc.) and / or to use the value of the second CFI in the PCFICH for an operation using a second configuration (e.g., eMBB operation, and / or traditional TTI operation, etc.), the UE 120 may be allowed to operate using various configurations and / or meet various different requirements of different configurations. In addition, compared to using the same CFI value for all configurations of the UE 120, these techniques may increase the flexibility of scheduling control information and / or data and may result in less wasted resources.

[0096] As noted above, Figure 7 Provided as an example only. Other examples may be found in Figure 7 Different than described.

[0097] Figure 8 is a diagram illustrating another example 800 of a reliable indication of a value of a CFI in accordance with various aspects of the present disclosure.

[0098] As shown in reference numeral 810, base station 110 may send and UE 120 may receive a non-PCFICH message including a first subframe set to which a value of a first CFI is to be applied and an indication of a second subframe set to which a value of a second CFI is to be applied. As described elsewhere herein, the non-PCFICH message may include an RRC message, and / or a SIB message, etc.

[0099] In some aspects, the first subframe set may include only subframes of the first type, and the second subframe set may include only subframes of the second type. In some aspects, the first type and / or the second type may be indicated in a non-PCFICH message. For example, the first type may be a multicast broadcast single frequency network (MBSFN) subframe type. Additionally or alternatively, the second type may be a non-MBSFN subframe type. In some aspects, an MBSFN subframe may use up to two symbols for downlink control information (e.g., PDCCH symbols), and may therefore be distinguished from subframes of other types.

[0100] In some aspects, the value of the first CFI and / or the value of the second CFI may be indicated in a non-PCFICH message. For example, the non-PCFICH message may indicate the value of the first CFI and the corresponding first subframe set to which the value of the first CFI is to be applied. Similarly, the non-PCFICH message may indicate the value of the second CFI and the corresponding second subframe set to which the value of the second CFI is to be applied. In some aspects, the non-PCFICH message may use a single bit to indicate the value of a specific CFI (e.g., to indicate 2 of 3 possible CFI values) to reduce overhead. In some aspects, the non-PCFICH message may use two bits to indicate the value of a specific CFI (e.g., to indicate all 3 possible CFI values) to provide full flexibility for CFI indication.

[0101] Alternatively, the value of the first CFI and / or the value of the second CFI may not be indicated in the non-PCFICH message. In this case, the value of the first CFI and / or the value of the second CFI may be hard-coded in the memory of UE120 (e.g., according to the fixed value of the first CFI and / or the fixed value of the second CFI indicated in the 3GPP standard). For example, the value of the first CFI and the value of the second CFI may be fixed according to the 3GPP specification, and the non-PCFICH message may indicate a first subframe set to which the value of the first fixed CFI is to be applied and a second subframe set to which the value of the second fixed CFI is to be applied. As another example, one of the values ​​of the CFI (e.g., the value of the first CFI) may be fixed according to the 3GPP specification, and the value of the other CFI (e.g., the value of the second CFI) may be indicated in the non-PCFICH message. For example, the value of the CFI applied to the MBSFN subframe may be fixed according to the 3GPP specification (e.g., fixed to a CFI value of 2), and the value of the CFI applied to the non-MBSFN subframe may be indicated in the non-PCFICH message.

[0102] In some aspects, a bitmap may be used to indicate the value of the CFI applied to the first set of subframes and the second set of subframes. For example, each bit in the bitmap may correspond to a subframe within a time window (e.g., 40 bits for 40 subframes in a time window, and / or 10 bits for 10 subframes in a time window, etc.). In this case, the first value of the bit (e.g., 0) may indicate that the value of the first CFI will be applied to the subframe corresponding to the bit, and the second value of the bit (e.g., 1) may indicate that the value of the second CFI will be applied to the subframe corresponding to the bit. In some aspects, the bitmap may have different lengths for different types of subframes (e.g., a longer bitmap, such as 40 bits, for MBSFN subframes with fewer CFI options, and a smaller bitmap, such as 10 bits, for non-MBSFN subframes with more CFI options). The time window of the bitmap may correspond to, for example, a TTI (e.g., a frame), and / or multiple TTIs, etc. In some aspects, the pattern indicated by the bitmap may be repeated for consecutive time windows. Additionally or alternatively, the base station 110 may use a bitmap to periodically indicate a new pattern. In certain aspects, multiple patterns may be preconfigured in a non-PCFICH message and may be indicated using an index value mapped to the pattern.

[0103] In some aspects, a non-PCFICH message may indicate a first set of values ​​of a CFI mapped to a first set of subframes, and / or a second set of values ​​of a CFI mapped to a second set of subframes. In some aspects, two bits may be used to indicate each value to allow for the indication of a full range of values ​​for the CFI (e.g., 1, 2, or 3). In this case, a bitmap that maps two bits to a subframe may be used to map the values ​​of the CFI to subframes. The aspects described above in conjunction with the bitmap may be applied to the indication technique (e.g., bitmaps of different lengths for different types of subframes, time windows for bitmaps, repeating a pattern indicated in a bitmap for consecutive time windows, and / or using index values ​​to indicate a preconfigured bitmap pattern, etc.).

[0104] In some aspects, the non-PCFICH message may include an information element indicating a value of a first CFI and a value of a second CFI, may include a first bitmap that maps the value of the first CFI or the value of the second CFI to a first subframe set, and may include a second bitmap that maps the value of the first CFI or the value of the second CFI to a second subframe set. In some aspects, each bit in the bitmap may correspond to a single subframe. In this way, some flexibility in CFI indication and subframe format may be achieved while also saving overhead compared to mapping two bits to each subframe.

[0105] As indicated by reference numeral 820, UE 120 may determine whether a subframe on which UE 120 is operating is included in the first subframe set or the second subframe set. The subframe may be, for example, a subframe for which UE 120 needs to use a value of CFI to determine the format of the subframe (e.g., before processing a signal received in the subframe to determine whether to interpret the signal as control information or data and / or the like).

[0106] As indicated by reference numeral 830, UE 120 may selectively use a value of the first CFI or a value of the second CFI for the subframe based at least in part on whether the subframe is included in the first subframe set or the second subframe set. For example, if the subframe is included in the first set, UE 120 may apply a value of the first CFI from a non-PCFICH message to the subframe. Similarly, if the subframe is included in the second set, UE 120 may apply a value of the second CFI from a non-PCFICH message to the subframe.

[0107] In some aspects, UE 120 may be combined with the above Figure 7 In a similar manner as described above, based at least in part on a determination that UE 120 is operating with a first configuration (e.g., a configuration having a value of CFI to be indicated in a non-PCFICH message), a first CFI value or a second CFI value is used for a subframe. Similarly, UE 120 may use the first CFI value or the second CFI value in combination with the above Figure 7 In a similar manner as described, the value of the first CFI or the value of the second CFI is used for the subframe based at least in part on a determination that UE 120 is not operating using the second configuration (e.g., a configuration having a value of the CFI indicated in the PCFICH to be used).

[0108] In certain aspects, one or more techniques described herein may be used where the UE 120 is configured to use multiple component carriers (e.g., for carrier aggregation, and / or dual connectivity, etc.). In this case, the first subframe set and the second subframe set indicated in the non-PCFICH message may apply to all component carriers of the UE 120. For example, the non-PCFICH message may indicate a single first subframe set and a single second subframe set, and the mapping of the indicated CFI values ​​to those subframe sets may apply to all component carriers of the UE 120. In this way, signaling overhead may be reduced.

[0109] Alternatively, different subframe sets indicated in the non-PCFICH message may be applied to different component carriers of UE 120. For example, the non-PCFICH message may indicate multiple first subframe sets and multiple second subframe sets, and different mappings of CFI values ​​to different sets may be applied to different component carriers. For example, the mapping of CFI values ​​to the first subframe set and the second subframe set may be applicable to the first component carrier of UE 120, and / or the mapping of CFI values ​​to the third subframe set and the fourth subframe set (e.g., indicated in the non-PCFICH message) may be applied to the second component carrier of UE 120, and so on. Additionally or alternatively, a particular subframe set may be applied to more than one but less than all component carriers of UE 120. In some aspects, such an application may be indicated in a non-PCFICH message. In this way, the flexibility of PCFICH indications and subframe formats may be increased.

[0110] Here, the first subframe set and the second subframe set are used as examples for description. In some aspects, the non-PCFICH message may indicate more than two subframe sets, such as three subframe sets, and / or four subframe sets, etc. In this way, the flexibility of the PCFICH indication and the subframe format may be increased.

[0111] As noted above, Figure 8 Provided as an example only. Other examples may be found in Figure 8 Different than described.

[0112] Fig. 9is a diagram illustrating an example process 900 performed, for example, by a UE in accordance with various aspects of the present disclosure. Example process 900 is an example of a UE (eg, UE 120 and / or similar UEs) performing operations associated with reliable indication or reception of a value of a CFI.

[0113] like Fig. 9 As shown, in some aspects, process 900 may include receiving a value of a control format indicator (CFI) in a radio resource control (RRC) message or a system information block (SIB) (block 910). Figure 6 As described, the UE (eg, using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and / or controller / processor 280, etc.) may receive the value of the CFI in an RRC message or SIB.

[0114] As in Fig. 9 As further shown in FIG. 9 , in some aspects, process 900 may include using the value of the CFI received in the RRC message or SIB regardless of the configuration in which the UE is operating (block 920). For example, as described above in conjunction with Figure 6 As described, a UE (eg, using controller / processor 280, etc.) may use the value of a CFI received in an RRC message or SIB regardless of the configuration in which the UE is operating.

[0115] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0116] In a first aspect, a UE receives a value of CFI in an RRC message or SIB based at least in part on being configured with an ultra-reliable low-latency communication (URFFC) configuration or a shortened transmission time interval (sTTI) configuration. In a second aspect, alone or in combination with the first aspect, a physical control format indicator channel (PCFICH) is not decoded based at least in part on the value of CFI received in an RRC message or SIB. In a third aspect, alone or in combination with one or more of the first and second aspects, the value of CFI received in an RRC message or SIB is used for at least one of the following: an ultra-reliable low-latency communication (URLLC) configuration, an enhanced mobile broadband (eMBB) configuration, a traditional transmission time interval (TTI) configuration, a shortened TTI (sTTI) configuration, a configuration with a delay requirement that meets a threshold, a configuration with a reliability requirement that meets a threshold, a carrier aggregation configuration, a dual-connectivity configuration, or some combination thereof.

[0117] although Fig. 9Example blocks of process 900 are shown, but in some aspects, process 900 may include more Fig. 9 More blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in . Additionally or alternatively, two or more of the blocks of process 900 may be performed in parallel.

[0118] Fig.10 is a diagram illustrating an example process 1000 performed, for example, by a UE in accordance with various aspects of the present disclosure. Example process 1000 is an example of a UE (eg, UE 120 and / or similar UEs) performing operations associated with reliable indication or reception of a value of a CFI.

[0119] like Fig.10 As shown, in some aspects, process 1000 may include receiving a value of a first CFI in a message not carried by the PCFICH (block 1010). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and / or controller / processor 280, etc.) may receive a value of a first CFI in a message not carried by the PCFICH, as described above in conjunction with Figure 7 as described.

[0120] As in Fig.10 As further shown in FIG. 1 , in some aspects, process 1000 may include determining whether the UE is operating using at least one of a first configuration for which a value of a first CFI is to be used or a second configuration for which a value of a second CFI indicated in the PCFICH is to be used (block 1020). For example, the UE (e.g., using controller / processor 280, etc.) may determine whether the UE is operating using at least one of a first configuration for which a value of a first CFI is to be used or a second configuration for which a value of a second CFI indicated in the PCFICH is to be used, as described above in conjunction with Figure 7 as described.

[0121] As in Fig.10 As further shown in FIG. 1 , in some aspects, process 1000 may include operating using at least one of a value of a first CFI or a value of a second CFI based at least in part on determining whether the UE is operating using at least one of the first configuration or the second configuration (block 1030). For example, the UE (e.g., using controller / processor 280, etc.) may operate using at least one of a value of a first CFI or a value of a second CFI based at least in part on determining whether the UE is operating using at least one of the first configuration or the second configuration, as described above in conjunction with Figure 7 as described.

[0122] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0123] In a first aspect, a value of a first CFI is used when the UE is operating using a first configuration, or a value of a second CFI is used when the UE is operating using a second configuration. In a second aspect, alone or in combination with the first aspect, the first configuration includes at least one of the following: an ultra-reliable low-latency communication (URLLC) configuration, a shortened TTI (sTTI) configuration, a configuration with a delay requirement less than or equal to a threshold, a configuration with a reliability requirement greater than or equal to a threshold, or some combination thereof. In a third aspect, alone or in combination with one or more of the first and second aspects, the second configuration includes at least one of the following: an enhanced mobile broadband (eMBB) configuration, a traditional transmission time interval (TTI) configuration, a configuration with a delay requirement greater than or equal to a threshold, a configuration with a reliability requirement less than or equal to a threshold, or some combination thereof.

[0124] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the PCFICH is not decoded based at least in part on a determination that the UE is operating using a first configuration instead of a second configuration. In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the PCFICH is decoded based at least in part on a determination that the UE is operating using: the second configuration instead of the first configuration, or both the first configuration and the second configuration. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the value of the first CFI is used for communicating using the first configuration, and the value of the second CFI is used for communicating using the second configuration.

[0125] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the value of the second CFI is required to be less than or equal to the value of the first CFI. In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the UE is configured to indicate an error if the value of the second CFI is greater than the value of the first CFI. In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the value of the first CFI is selected from the values ​​of multiple CFIs indicated in the message. In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the selection is based at least in part on determining that the UE is operating in a subframe for which the value of the first CFI is to be used. In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, the subframe for which the value of the first CFI is to be used is included in the subframe set (indicated in the message).

[0126] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the first configuration is to configure all component carriers of the UE using the values ​​of one or more CFIs indicated in the message. In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, all component carriers are configured using the same CFI value indicated in the message. In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, different component carriers are configured using different CFI values ​​indicated in the message.

[0127] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the second configuration is a configuration in which the component carriers of the UE are not configured using the value of the CFI indicated in the message. In a sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, the second configuration is a configuration in which all component carriers of the UE are configured using the value of one or more CFIs indicated in the PCFICH.

[0128] In the seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, a first component carrier set of the UE operates using a first configuration and a second component carrier set of the UE operates using a second configuration. In the eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, the first component carrier set uses a first CFI value and the second component carrier set uses a second CFI value. In the nineteenth aspect, either alone or in combination with one or more of the first to eighteenth aspects, the first component carrier set uses a first set of CFI values ​​indicated in a message. In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, the second component carrier set uses a second set of CFI values ​​indicated in a PCFICH.

[0129] In aspect 21, alone or in combination with one or more of aspects 1 to 20, a value of a first CFI is used for a first component carrier of the UE, and wherein one or more other CFI values ​​indicated in the message are used for corresponding one or more other component carriers of the UE. In aspect 22, alone or in combination with one or more of aspects 1 to 21, if when the secondary cell is operating using the second configuration, if the UE is configured with a value of CFI in a message for the secondary cell, then when the secondary cell is operating using the first configuration, the UE is required to configure CFI in a message for the secondary cell. In aspect 23, alone or in combination with one or more of aspects 1 to 22, the message is a radio resource control (RRC) message or a system information message carried in a system information block (SIB).

[0130] although Fig.10Example blocks of process 1000 are shown, but in some aspects process 1000 may include more Fig.10 More blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1000. Additionally or alternatively, two or more of the blocks of process 1000 may be performed in parallel.

[0131] Fig.11 is a diagram illustrating an example process 1100 performed, for example, by a UE in accordance with various aspects of the present disclosure. Example process 1100 is an example of a UE (eg, UE 120 and / or similar UEs) performing operations associated with reliable indication or reception of a value of a CFI.

[0132] As in Fig.11 As shown in , in some aspects, process 1100 may include receiving in a message an indication of a first set of subframes to which a value of a first CFI is to be applied (block 1110). For example, a UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and / or controller / processor 280, etc.) may receive in a message an indication of a first set of subframes to which a value of a first CFI is to be applied, as described above in conjunction with Figure 8 as described.

[0133] As in Fig.11 As further shown in FIG. 1 , in some aspects, process 1100 may include receiving in the message an indication of a second set of subframes to which a second CFI value is to be applied (block 1120). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and / or controller / processor 280, etc.) may receive in the message an indication of a second set of subframes to which a second CFI value is to be applied, as described above in conjunction with Figure 8 as described.

[0134] As in Fig.11 As further shown, in certain aspects, process 1100 may include selectively using a value of the first CFI or a value of the second CFI for the subframe based at least in part on whether the subframe is included in the first subframe set or the second subframe set (block 1130). For example, the UE (e.g., using controller / processor 280, etc.) may selectively use a value of the first CFI or a value of the second CFI for the subframe based at least in part on whether the subframe is included in the first subframe set or the second subframe set, as described above in conjunction with Figure 8 as described.

[0135] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0136] In a first aspect, the first subframe set includes subframes of a first type and the second subframe set includes subframes of a second type. In a second aspect, alone or in combination with the first aspect, at least one of the first type or the second type is indicated in a message. In a third aspect, alone or in combination with one or more of the first and second aspects, the first type is a multicast broadcast single frequency network (MBSFN) subframe type and the second type is a non-MBSFN subframe type.

[0137] In a fourth aspect, alone or in combination with one or more of the first to third aspects, at least one of the value of the first CFI or the value of the second CFI is indicated in a message. In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, at least one of the value of the first CFI or the value of the second CFI is not indicated in a message. In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, at least one of the value of the first CFI or the value of the second CFI is hard-coded in a memory of the UE.

[0138] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, at least one of the first subframe set or the second subframe set is indicated using a bitmap. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the message indicates at least one of: a first set of values ​​of a CFI mapped to the first subframe set, a second set of values ​​of a CFI mapped to the second subframe set, or some combination thereof. In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the message includes: an information element indicating a value of a first CFI and a value of a second CFI, mapping a value of the first CFI or a value of the second CFI to a first bitmap for each subframe included in the first subframe set, and mapping a value of the first CFI or a value of the second CFI to a second bitmap for each subframe included in the second subframe set.

[0139] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, the message is a radio resource control (RRC) message or a system information block (SIB) message. In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the value of the first CFI or the value of the second CFI is used for the subframe based at least in part on a determination that the UE is operating with a configuration having a value of the CFI to be used received in the message. In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the value of the first CFI or the value of the second CFI is used for the subframe based at least in part on a determination that the UE is not operating with a configuration having a value of the CFI to be used received in a physical control format indicator channel (PCFICH).

[0140] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the first subframe set and the second subframe set are applied to all component carriers of the UE. In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the first subframe set and the second subframe set are applied to a first component carrier of the UE. In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, different subframe sets are applied to one or more other component carriers of the UE.

[0141] although Fig.11 Example blocks of process 1100 are shown, but in some aspects process 1100 may include more Fig.11 More blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1100. Additionally or alternatively, two or more of the blocks of process 1100 may be performed in parallel.

[0142] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the various aspects to the precise forms disclosed. Modifications and variations may be made based on the above disclosure, or may be acquired from the practice of various aspects.

[0143] As used herein, the term component is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, or a combination of hardware and software.

[0144] Certain aspects are described herein in conjunction with thresholds. As used herein, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, and / or not equal to a threshold, etc.

[0145] It is apparent that the systems and / or methods described herein can be implemented in various forms of hardware, firmware, or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, the operation and behavior of the systems and / or methods are not described herein with reference to specific software code - it should be understood that software and hardware can be designed to implement the systems and / or methods based at least in part on the description herein.

[0146] Even if a particular combination of features is described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features can be combined in a manner that is not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below may only be directly subordinate to one claim, the disclosure of the various aspects includes each dependent claim combined with each other claim in the claim set. The phrase "at least one" in the list of reference items refers to any combination of these items, including single members. For example, "at least one of a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other order of a, b and c).

[0147] Unless explicitly stated, any element, action, or instruction used herein should not be interpreted as critical or essential. Moreover, as used herein, the articles "a" and "an" are intended to include one or more items and can be used interchangeably with "one or more." In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, and / or combinations of related and unrelated items, etc.) and can be used interchangeably with "one or more." Figure 1 In the case of an item, the term "only one" or similar language is used. In addition, as used herein, the terms "having," "having," "having," and / or similar terms are intended to be open-ended terms. In addition, the phrase "based on" is intended to mean "based, at least in part, on" unless expressly stated otherwise.

Claims

1. A wireless communication method performed by a user equipment UE, comprising: Receiving a value of a control format indicator CFI in a radio resource control RRC message or a system information block SIB; as well as Use the value of the CFI received in an RRC message or SIB, regardless of the configuration the UE is operating with, wherein based at least in part on receiving the value of the CFI in the RRC message or the SIB, a Physical Control Format Indicator Channel (PCFICH) is not decoded; Wherein, the UE receives the value of the CFI in the RRC message or the SIB based at least in part on being configured with an ultra-reliable low-delay communication (URLLC) configuration or a shortened transmission time interval (sTTI) configuration.

2. The method according to claim 1, wherein: The value of the CFI received in the RRC message or the SIB is used for at least one of the following: Ultra-reliable low-latency communication URLLC configuration, Enhanced mobile broadband eMBB configuration, Traditional transmission time interval TTI configuration, 1 ms TTI configuration, Shortened TTIsTTI configuration, A configuration with latency requirements that meet the threshold, configurations with reliability requirements that meet the threshold, Carrier aggregation configuration, Dual connection configuration, or Some combination of them.

3. A wireless communication method performed by a user equipment UE, comprising: receiving in a message an indication of a first set of subframes of a first type, wherein the first set of subframes is associated with a value of a first control format indicator CFI to be applied; receiving in the message an indication of a second set of subframes of a second type, wherein the second set of subframes is associated with a value of a second CFI to be applied; Identifying that a subframe in which the UE is operating is included in the first subframe set or the second subframe set; as well as selectively using a first CFI value or a second CFI value for the subframe based at least in part on identifying that the subframe is included in the first set of subframes or in the second set of subframes; wherein the value of the first CFI or the value of the second CFI is used for the subframe based at least in part on a determination that the UE is operating with a configuration to use the value of the CFI received in the message, Among them, the configuration is an ultra-reliable low-latency communication URLLC configuration or a shortened transmission time interval sTTI configuration.

4. The method according to claim 3, wherein: At least one of the first type or the second type is indicated in the message.

5. The method according to claim 3, wherein: The first type is a Multicast Broadcast Single Frequency Network (MBSFN) subframe type, and the second type is a non-MBSFN subframe type.

6. The method according to claim 3, wherein: At least one of a value of the first CFI or a value of the second CFI is indicated in the message.

7. The method according to claim 3, wherein: At least one of the value of the first CFI or the value of the second CFI is not indicated in the message.

8. The method according to claim 3, wherein: At least one of the value of the first CFI or the value of the second CFI is hard-coded in a memory of the UE.

9. The method according to claim 3, wherein: At least one of the first subframe set or the second subframe set is indicated using a bitmap.

10. The method according to claim 3, wherein: The message indicates at least one of the following: a first set of CFI values ​​mapped to the first set of subframes, or A second set of CFI values ​​mapped to the second set of subframes.

11. The method according to claim 3, wherein: The message includes: an information element indicating a value of the first CFI and a value of the second CFI, mapping the value of the first CFI or the value of the second CFI to a first bitmap of each subframe included in the first subframe set, and The value of the first CFI or the value of the second CFI is mapped to a second bitmap of each subframe included in the second subframe set.

12. The method according to claim 3, wherein: The message is a radio resource control RRC message or a system information block SIB message.

13. The method according to claim 3, wherein: Based at least in part on a determination that the UE is not operating with a configuration to use a value of a CFI received in a physical control format indicator channel (PCFICH), the value of the first CFI or the value of the second CFI is used for the subframe.

14. The method according to claim 3, wherein: The first subframe set and the second subframe set are applied to all component carriers of the UE.

15. The method according to claim 3, wherein: The first subframe set and the second subframe set are applied to a first component carrier of the UE.

16. The method according to claim 15, wherein: Different subframe sets are applied to one or more other component carriers of the UE.

17. A user equipment UE for wireless communication, comprising: Memory; as well as one or more processors operably coupled to the memory, the memory and the one or more processors being configured to: Receiving a value of a control format indicator CFI in a radio resource control RRC message or a system information block SIB; and Use the value of the CFI received in an RRC message or SIB, regardless of the configuration the UE is operating with, wherein based at least in part on receiving the value of the CFI in the RRC message or the SIB, a Physical Control Format Indicator Channel (PCFICH) is not decoded; Wherein, the UE receives the value of the CFI in the RRC message or the SIB based at least in part on being configured with an ultra-reliable low-delay communication (URLLC) configuration or a shortened transmission time interval (sTTI) configuration.

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