Random access opportunity selection for user devices with reduced capabilities

Abstract

Methods, systems, and devices for wireless communications are described. The described techniques relate to improved methods, systems, devices, and apparatuses that support random access opportunity (RO) selection for reduced capability (RedCap) user equipment (UE). A RedCap UE operating in half-duplex mode may use the techniques described herein to efficiently select an RO in which to transmit a random access preamble based on the duration between the last received downlink transmission and the RO meeting a threshold duration. The UE may receive system information that maps a set of synchronization signal blocks (SSBs) to a set of ROs. The UE may then select an RO from the set of ROs in which to transmit a random access preamble such that the UE has sufficient time to transition from a receive mode to a transmit mode to transmit the random access preamble.

Description

[Technical Field]

[0001] Cross-reference of related applications

[0001] This patent application claims priority to Lei et al.'s international patent application PCT / CN2021 / 102348, titled "RANDOM-ACCESS OCCASION SELECTION FOR REDUCED-CAPABILITY USER EQUIPMENT," filed on 25 June 2021, assigned to the assignee of this application, and expressly incorporated herein by reference in its entirety.

[0002]

[0002] The following relates to wireless communications, including random access opportunity selection for user devices with reduced capabilities. [Background technology]

[0003]

[0003] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcast. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems such as Long-Term Evolution (LTE®) systems, LTE-A systems, or LTE-A Pro systems, and fifth-generation (5G) systems, sometimes called New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM).

[0004]

[0004] A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may in some cases be known as User Equipment (UE). In some wireless communication systems, the UE can use a random access procedure to establish or re-establish a connection with the base station. Improved techniques for supporting the random access procedure between the UE and the base station may be desired. [Overview of the Initiative]

[0005]

[0005] The techniques described relate to improved methods, systems, devices, and apparatus for supporting random-access occasion (RO) selection for reduced-capability (RedCap) user equipment (UE). A RedCap UE operating in half-duplex mode may use the techniques described herein to efficiently select an RO in which to transmit a random-access preamble, based on the duration between the last received downlink transmit and the RO satisfying a threshold duration. The UE may receive system information mapping a set of synchronization signal blocks (SSBs) to a set of ROs. The UE may then select an RO from the set of ROs in which to transmit a random-access preamble, such that the UE has sufficient time to transition from receive mode to transmit mode in order to transmit the random-access preamble. These techniques may enable a half-duplex RedCap UE to efficiently perform a random-access procedure to establish or re-establish a connection with a base station.

[0006]

[0006] A method for wireless communication in a UE is described. The method may include receiving a message containing multiple mappings of each set of synchronization signal blocks to each set of random access channel opportunities. The method may also include receiving one or more synchronization signal blocks from a set of synchronization signal blocks, each set of synchronization signal blocks being identified from each set of synchronization signal blocks according to one of multiple mappings determined at least in part on the capabilities of the UE, and each set of synchronization signal blocks being associated with a set of random access channel opportunities. The method may also include transmitting a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronization signal blocks, the random access channel opportunity being selected from a subset of the set of random access channel opportunities based on the duration between the last received downlink transmission and the random access channel opportunity satisfying a threshold duration.

[0007]

[0007] An apparatus for wireless communication in a UE is described. The apparatus may include a processor, memory coupled to the processor, and instructions stored in the memory. Instructions may be executable by the processor to cause the apparatus to receive a message that thereby includes a plurality of mappings of each set of synchronous signal blocks to each set of random access channel opportunities. Instructions may also be executable by the processor to cause the apparatus to receive one or more synchronous signal blocks from a set of synchronous signal blocks, the set of synchronous signal blocks being identified from each set of synchronous signal blocks according to one of a plurality of mappings determined at least in part on the capabilities of the UE, and the set of synchronous signal blocks being associated with a set of random access channel opportunities. Instructions may also be executable by the processor to cause the apparatus to transmit a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronous signal blocks, the random access channel opportunity being selected from a subset of the set of random access channel opportunities based on the duration between the last received downlink transmission and the random access channel opportunity satisfying a threshold duration.

[0008]

[0008] Another device for wireless communication in the UE is described. This device may include means for receiving a message which includes a plurality of mappings of each set of synchronization signal blocks to each set of random access channel opportunities. This device may include means for receiving one or more synchronization signal blocks from the set of synchronization signal blocks, which are identified from each set of synchronization signal blocks according to one of a plurality of mappings which are determined at least in part on the capabilities of the UE, and the set of synchronization signal blocks are associated with a set of random access channel opportunities. This device may include means for transmitting a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronization signal blocks, which are selected from a subset of the set of random access channel opportunities on the basis that the duration between the last received downlink transmission and the random access channel opportunity satisfies a threshold duration.

[0009]

[0009] A non-temporary computer-readable medium for storing code for wireless communication in a UE is described. The code may include instructions executable by a processor for receiving a message which includes a plurality of mappings of each set of synchronous signal blocks to each set of random access channel opportunities. The code may include instructions executable by a processor for receiving one or more synchronous signal blocks from a set of synchronous signal blocks, each set of synchronous signal blocks is identified from each set of synchronous signal blocks according to one of a plurality of mappings determined at least in part on the capabilities of the UE, and each set of synchronous signal blocks is associated with a set of random access channel opportunities. The code may include instructions executable by a processor for transmitting a random access preamble during a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronous signal blocks, the random access channel opportunity is selected from a subset of the set of random access channel opportunities on the basis that the duration between the last received downlink transmission and the random access channel opportunity satisfies a threshold duration.

[0010]

[0010] Some examples of the methods, apparatus, and non-temporary computer-readable media described herein may further include operations, features, means, or instructions for the UE to receive instructions for an uplink bandwidth portion for transmitting a random access preamble, based on the UE's ability. Some examples of the methods, apparatus, and non-temporary computer-readable media described herein may further include operations, features, means, or instructions for identifying a subset of a set of random access channel opportunities for selecting a random access channel opportunity from there, based on the duration between one or more synchronization signal blocks and each random access channel opportunity in a subset of the set of random access channel opportunities satisfying a threshold duration.

[0011]

[0011] Some examples of the methods, apparatus, and non-temporary computer-readable media described herein may further include operations, features, means, or instructions for identifying a subset of the set of random access channel opportunities for selecting a random access channel opportunity from a set of random access channel opportunities, further based on excluding random access channel opportunities from a set of random access channel opportunities that precede a synchronous signal block in a slot. In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, the UE may be configured to operate in half-duplex mode based on the capabilities of the UE, and the last received downlink transmit includes a control channel transmit, a data channel transmit, or a reference signal transmit.

[0012]

[0012] In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, receiving a message may include an operation, feature, means, or instruction in the message to receive instructions for a subset of random access channel opportunities to select a random access channel opportunity from there, based on the duration between the last received synchronization signal block of one or more synchronization signal blocks and each random access channel opportunity in a subset of the set of random access channel opportunities satisfying a threshold duration.

[0013]

[0013] In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, the threshold duration satisfies the minimum time for the UE to transition from receive mode to transmit mode. In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, the UE may be configured to utilize frequency division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode may be based on the numerology used for the random access preamble, the capabilities of the UE, or both. In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, the UE may be configured to utilize time division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode may be based on the numerology used for the random access preamble, the capabilities of the UE, the radio frequency switching time in the UE, or a combination thereof.

[0014]

[0014] In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, the threshold duration may be equal to the duration configured in the UE to switch from the receive mode to the transmit mode in time-division duplex mode. Some examples of the methods, apparatus, and non-temporary computer-readable media described herein may further include an operation, feature, means, or instruction for receiving a threshold duration instruction based on the UE's ability, and a random access channel opportunity may be selected based on receiving a threshold duration instruction.

[0015]

[0015] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include operations, features, means, or instructions for selecting a random access channel opportunity to transmit a random access preamble in there, based on the fact that a reference signal received power measurement of one of one or more synchronization signal blocks satisfies a threshold. In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the message includes a system information message or a radio resource control message. In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the capability of the UE includes a reduced capability. In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the set of synchronization signal blocks is indicated by ssb-PositionsInBurst in system information block 1 or in ServingCellConfigCommon.

[0016]

[0016] A method for wireless communication at a base station will be described. The method may include: sending a message to a set of multiple UEs including a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of multiple UEs having a first capability, and a second mapping of a set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of multiple UEs having a second capability; sending a set of synchronization signal blocks; and in response to the transmission of the set of synchronization signal blocks, receiving a random access preamble from one of the UEs in a random access channel opportunity selected from the first set of random access channel opportunities according to a first mapping based on the UEs having the first capability.

[0017]

[0017] An apparatus for wireless communication in a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may cause the apparatus to transmit a message including a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of a plurality of UEs having a first capability, and a second mapping of the set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of the plurality of UEs having a second capability, transmit the set of synchronization signal blocks, and in response to transmitting the set of synchronization signal blocks, receive a random access preamble from one of the plurality of UEs at a random access channel opportunity selected from the first set of random access channel opportunities according to the first mapping based on the UEs having the first capability, which may be executable by the processor.

[0018]

[0018] Another apparatus for wireless communication in a base station is described. The apparatus may include means for transmitting a message including a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of a plurality of UEs having a first capability, and a second mapping of the set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of the plurality of UEs having a second capability, means for transmitting the set of synchronization signal blocks, and means for receiving a random access preamble from one of the plurality of UEs at a random access channel opportunity selected from the first set of random access channel opportunities according to the first mapping based on the UEs having the first capability in response to transmitting the set of synchronization signal blocks.

[0019]

[0019] A non-temporary computer-readable medium for storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to send a message to a set of multiple UEs, which includes a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of multiple UEs having a first capability, and a second mapping of a set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of multiple UEs having a second capability; to send a set of synchronization signal blocks; and in response to sending a set of synchronization signal blocks, to receive a random access preamble from one of the multiple UEs in a random access channel opportunity selected from the first set of random access channel opportunities according to the first mapping based on the UEs having the first capability.

[0020]

[0020] Some examples of the methods, apparatus, and non-temporary computer-readable media described herein may further include operations, features, means, or instructions for the UE to transmit instructions for an uplink bandwidth portion for transmitting a random access preamble, based on a first capability of the UE. Some examples of the methods, apparatus, and non-temporary computer-readable media described herein may further include operations, features, means, or instructions for identifying a first set of random access channel opportunities from which the UE may select a random access channel opportunity, based on the duration between the last transmitted synchronization signal block of a set of synchronization signal blocks and each random access channel opportunity in a first set of random access channel opportunities satisfying a threshold duration.

[0021]

[0021] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the threshold duration satisfies the minimum time for the UE to transition from the receive mode to the transmit mode. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the UE may be configured to utilize frequency division multiplexing, and the minimum time for the UE to transition from the receive mode to the transmit mode may be based on the numerology used for the random access preamble, the UE's capabilities, or both.

[0022]

[0022] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the UE may be configured to utilize time division multiplexing, and the minimum time for the UE to transition from the receive mode to the transmit mode may be based on the numerology used for the random access preamble, the UE's capabilities, the radio frequency switching time in the UE, or a combination thereof. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further be based on excluding random access opportunities preceding the synchronization signal block within a slot, and may further include operations, features, means, or instructions for identifying a first set of random access channel opportunities from which the UE may select a random access channel opportunity.

[0023]

[0023] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the threshold duration may be equal to the duration configured in the UE to switch from the receive mode to the transmit mode in the time division multiplexing mode. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an indication of the threshold duration to the UE based on the UE's capabilities, and receiving a random access preamble during a random access channel opportunity may be based on transmitting an indication of the threshold duration.

[0024]

[0024] In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, receiving a random access preamble may include an operation, feature, means, or instruction for receiving a random access preamble during a random access channel opportunity, based on a reference signal received power measurement of a synchronization signal block in a set of synchronization signal blocks meeting a threshold. In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, the message includes a system information message or a radio resource control message. In some examples of the methods, apparatus, and non-temporary computer-readable media described herein, the first capability of the UE includes a reduced capability. [Brief explanation of the drawing]

[0025] [Figure 1]

[0025] This figure shows an example of a wireless communication system that supports random access opportunity (RO) selection for a reduced-capacity (RedCap) user device (UE) according to an aspect of the present disclosure. [Figure 2]

[0026] This figure shows examples of different categories of UE according to the aspects of this disclosure. [Figure 3]

[0027] This figure shows an example of half-duplex (HD) frequency division duplexing (FDD) according to an aspect of the present disclosure. [Figure 4]

[0028] This figure shows an example of timing advance during time division duplexing (TDD) according to the aspects of this disclosure. [Figure 5]

[0029] This figure shows an example of a wireless communication system that supports RO selection for RedCap UE according to the aspects of this disclosure. [Figure 6]

[0030] This figure shows an example of a process flow that supports RO selection for RedCap UE according to the aspects of this disclosure. [Figure 7]

[0031] This is a block diagram of a device supporting RO selection for RedCap UE according to an aspect of this disclosure. [Figure 8] This is a block diagram of a device supporting RO selection for RedCap UE according to an aspect of this disclosure. [Figure 9]

[0032] This is a block diagram of a communications manager supporting RO selection for RedCap UE according to the aspects of this disclosure. [Figure 10]

[0033] This is a diagram of a system including a device that supports RO selection for RedCap UE according to an aspect of this disclosure. [Figure 11]

[0034] This is a block diagram of a device supporting RO selection for RedCap UE according to an aspect of this disclosure. [Figure 12] This is a block diagram of a device supporting RO selection for RedCap UE according to an aspect of this disclosure. [Figure 13]

[0035] This is a block diagram of a communications manager supporting RO selection for RedCap UE according to the aspects of this disclosure. [Figure 14]

[0036] This is a diagram of a system including a device that supports RO selection for RedCap UE according to an aspect of this disclosure. [Figure 15]

[0037] This flowchart shows a method for supporting RO selection for RedCap UE according to the aspects of this disclosure. [Figure 16] This flowchart shows a method for supporting RO selection for RedCap UE according to the aspects of this disclosure. [Modes for carrying out the invention]

[0026]

[0038] In some wireless communication systems, user equipment (UE) can use a random access procedure to establish or re-establish a connection with a base station. As part of the random access procedure, the UE may transmit a random access preamble to the base station in response to a synchronization signal block (SSB) received from the base station. The base station may transmit a set of SSBs on different beams. The UE may select an SSB from the set of SSBs, for example, if a measurement performed on the SSB (e.g., reference signal received power, RSRP) meets a threshold (e.g., RSRP threshold). Since the UE may receive each SSB on a different beam, the selection of an SSB may correspond to selecting a beam for communication with the base station. However, in some cases, a random access opportunity (RO) paired with the selected SSB may quickly follow the SSB received by the UE. Additionally or alternatively, the UE may receive another downlink transmission shortly before the RO. As a result, the random access procedure in the UE may be delayed because the UE may not have enough time to transition to transmit mode for transmitting a random access preamble in the RO in response to the selected SSB.

[0027]

[0039] As described herein, wireless communication systems may support efficient techniques for facilitating random access procedures between a UE and a base station. In particular, a RedCap UE operating in half-duplex mode may use the techniques described herein to efficiently select an RO for transmitting a random access preamble, based on the duration between the last received downlink transmit and the RO satisfying a threshold duration. The UE may receive system information mapping a set of SSBs to a set of ROs. The UE may then select an RO from the set of ROs for transmitting a random access preamble, such that the UE has sufficient time to transition from receive mode to transmit mode in order to transmit the random access preamble. These techniques may enable a half-duplex RedCap UE to efficiently perform a random access procedure to establish or re-establish a connection with a base station.

[0028]

[0040] The aspects of this disclosure are first described in the context of wireless communication systems. An example of a process and signaling exchange supporting RO selection for RedCap UE is then described. The aspects of this disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flowcharts relating to RO selection for RedCap UE.

[0029]

[0041] Figure 1 shows an example of a wireless communication system 100 supporting RO selection for RedCap UE according to aspects of this disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long-Term Evolution (LTE) network, an LTE Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support extended broadband communication, ultra-high reliability (e.g., mission-critical) communication, low-latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0030]

[0042] Base stations 105 may be distributed across a geographical area to form a wireless communication system 100 and may be devices of different forms or with different capabilities. Base stations 105 and UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 from which UEs 115 and base stations 105 can establish one or more communication links 125. A coverage area 110 may be an example of a geographical area from which base stations 105 and UEs 115 can support the communication of signals according to one or more radio access technologies.

[0031]

[0043] The UE115 may be distributed across the entire coverage area 110 of the wireless communication system 100, and each UE115 may be fixed, mobile, or both at different times. The UE115 may be different forms of devices or devices with different capabilities. Several exemplary UE115 are shown in Figure 1. The UE115 described herein may be capable of communicating with various types of devices, such as other UE115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), as shown in Figure 1.

[0032]

[0044] The base stations 105 can communicate with the core network 130, or communicate with each other, or both. For example, a base station 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other via the backhaul links 120 (e.g., via X2, Xn, or other interfaces) either directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130), or both. In some examples, the backhaul links 120 may be one or more wireless links, or may include one or more wireless links.

[0033]

[0045] One or more of the base stations 105 described herein may include, or be referred to as, a base station transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or giga-NodeB (any of which may be called a gNB), a Home NodeB, a Home eNodeB, or other appropriate terms.

[0034]

[0046] UE115 may include, or may be referred to as, a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other appropriate term; “device” may also be referred to as a unit, station, terminal, or client, among other examples. UE115 may also include, or may be referred to as, a personal electronic device such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE115 may include, or may be referred to as, a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various items such as electrical appliances, vehicles, meters, etc.

[0035]

[0047] The UE115 described herein may be able to communicate with other UE115s that may function as relays, as shown in Figure 1, and with various types of devices, including, among other examples, base stations 105 and network equipment, such as macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations.

[0036]

[0048] UE115 and base station 105 may communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication links 125. For example, a carrier used for communication link 125 may include a portion of the radio frequency spectrum band (e.g., a bandwidth part (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry collected signaling (e.g., synchronization signals, system information), control signaling to coordinate operations with the carrier, user data, or other signaling. The wireless communication system 100 may support communication with UE115 using carrier aggregation or multi-carrier operation. UE115 may consist of multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used with both frequency-division duplex (FDD) component carriers and time-division duplex (TDD) component carriers.

[0037]

[0049] In some cases (e.g., in carrier aggregation configurations), a carrier may also have collection or control signaling to coordinate its operation with other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be arranged according to a channel raster for discovery by the UE115. A carrier may operate in standalone mode, where initial collection and connection may be performed via the carrier by the UE115, or it may operate in non-standalone mode, where connection is anchored using different carriers (e.g., of the same or different radio access technologies).

[0038]

[0050] A communication link 125 shown in the wireless communication system 100 may include uplink transmissions from the UE 115 to the base station 105, or downlink transmissions from the base station 105 to the UE 115. The carrier may carry downlink communications or uplink communications (for example, in FDD mode), or may be configured to carry both downlink communications and uplink communications (for example, in TDD mode).

[0039]

[0051] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of several determined bandwidths for a carrier of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) may have a hardware configuration that supports communication over a specific carrier bandwidth, or may be configurable to support communication over one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication over carriers associated with multiple carrier bandwidths. In some examples, each UE 115 being served may be configured to operate across a portion (e.g., subband, BWP) or all of the carrier bandwidth.

[0040]

[0052] The signal waveform transmitted on the carrier may consist of multiple subcarriers (using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In systems employing MCM techniques, a resource element may consist of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements the UE115 receives, and the higher the order of the modulation scheme, the higher the data rate for the UE115 can become. Wireless communication resources may refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity for communication with the UE115.

[0041]

[0053] The time interval for base station 105 or UE115 is, for example, T s = 1 / (Δf max ·N f It can refer to a sampling period of ) seconds, and can be expressed in multiples of the basic time unit, where Δf max This can represent the maximum supported subcarrier interval, N f This may represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0042]

[0054] Each frame may contain multiple sequentially numbered subframes or slots, each subframe or slot having the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into several slots. Alternatively, each frame may contain a variable number of slots, the number of slots may depend on the subcarrier interval. Each slot may contain several symbol periods (e.g., depending on the length of the cyclic prefix prepared for each symbol period). In some wireless communication systems 100, a slot may be further divided into several minislots, each containing one or more symbols. Except for the cyclic prefix, each symbol period may contain one or more (e.g., N) symbols. f It may include a sampling period of (1) units. The duration of the symbol period may depend on the subcarrier interval or the frequency band of operation.

[0043]

[0055] A subframe, slot, minislot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be called a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in the TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., within a burst of shortened TTIs, sTTIs).

[0044]

[0056] Physical channels may be multiplexed on the carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on the downlink carrier using, for example, one or more of the following techniques: time-division multiplexing (TDM), frequency-division multiplexing (FDM), or hybrid TDM-FDM. A control region for a physical control channel (e.g., a control resource set, CORESET) may be defined by the number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESET) may be configured for a set of UE115s. For example, one or more UE115s may monitor or search the control region for control information according to one or more search space sets, each search space set may contain one or more control channel candidates at one or more aggregation levels configured in a cascaded manner. The aggregation level for a candidate control channel may refer to the number of control channel resources (e.g., control channel elements, CCEs) associated with encoded information for a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UE115s, and a UE-specific search space set for sending control information to a specific UE115.

[0045]

[0057] In some examples, base station 105 may be mobile and therefore may provide communication coverage to a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, heterogeneous networks in which different types of base stations 105 provide coverage to various geographic coverage areas 110 using the same or different radio access technologies.

[0046]

[0058] Some UE115s, such as MTC devices or IoT devices, may be low-cost or low-complexity devices that can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that enables devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that incorporate sensors or meters to measure or capture information and relay such information to a central server or application program that utilizes such information or presents it to a human interacting with the application program. Some UE115s may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security detection, physical access control, and transaction-based business billing.

[0047]

[0059] Some UE115s may be configured to employ power-saving operating modes, such as half-duplex (HD) communication (e.g., modes that support one-way communication via transmit or receive, but not simultaneous transmit and receive). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power-saving techniques for the UE115 include entering a power-saving deep sleep mode when not engaged in active communication, operating over a limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UE115s may be configured for operation using narrowband protocol types related to a defined portion or range within the carrier, within the carrier's guard band, or outside the carrier (e.g., a set of subcarriers or resource blocks (RBs)).

[0048]

[0060] In some cases, the UE115 may support Type A half-duplex operation (e.g., a first type of half-duplex operation), Type B half-duplex operation (e.g., a second type of half-duplex operation), or both. In Type A half-duplex operation, the UE115 may be configured with a guard period between the downlink and the uplink (e.g., when the downlink switches to the uplink). In Type B half-duplex operation, the UE115 may be configured with a guard period between the downlink and the uplink (e.g., when the downlink switches to the uplink) and another guard period between the uplink and the downlink (e.g., when the uplink switches to the downlink).

[0049]

[0061] The wireless communication system 100 may be configured to support ultra-reliable low-latency communications, low-latency communications, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission-critical communications. The UE 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission-critical functions). Ultra-reliable communications may include private communications or group communications and may be supported by one or more mission-critical services such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include prioritizing services, and mission-critical services may be used for public safety or general commercial purposes. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably herein.

[0050]

[0062] In some examples, UE115 may also be able to communicate directly with other UE115 via a device-to-device (D2D) communication link 135 (for example, using a peer-to-peer (P2P) protocol or a D2D protocol). One or more UE115s utilizing D2D communication may be within the geographical coverage area 110 of base station 105. Other UE115s in such a group may be outside the geographical coverage area 110 of base station 105, or in some cases may not be able to receive transmissions from base station 105. In some examples, a group of UE115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE115 transmits to all other UE115s in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UE115s without the involvement of base station 105.

[0051]

[0063] In some systems, the D2D communication link 135 may be an example of a communication channel between vehicles (e.g., UE 115), such as a side-link communication channel. In some examples, vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or any combination thereof. Vehicles may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information related to the V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure such as roadside units, or with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both.

[0052]

[0064] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a fifth-generation (5G) core (5GC), which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)), and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW), a Packet Data Network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratus (NAS) functions such as mobility, authentication, and bearer management for UE 115 serviced by base station 105 associated with the core network 130. User IP packets may be forwarded through user plane entities that may provide IP address allocation and other functions. The user plane entity may be connected to an IP service 150 for one or more network operators. The IP service 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or a packet-switched streaming service.

[0053]

[0065] Some of the network devices, such as the base station 105, may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with the UE 115 through one or more other access network transmission entities 145, which may be called radio heads, smart radio heads, or transmission / reception points (TRPs). Each access network transmission entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or integrated into a single network device (e.g., base station 105).

[0054]

[0066] The wireless communication system 100 may typically operate using one or more frequency bands in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, as wavelengths range from approximately 1 decimeter to 1 meter. While UHF waves may be blocked or redirected by building and environmental characteristics, they can penetrate structures sufficiently to allow a macrocell to service an indoor UE 115. Transmitting UHF waves may involve smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmitting using lower frequencies and longer waves in the short frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

[0055]

[0067] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may utilize License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in unlicensed radio frequency spectrum bands, devices such as base station 105 and UE 115 may utilize carrier detection for collision detection and avoidance. In some examples, operation in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in licensed bands (e.g., LAA). Operation in unlicensed spectrums may include, among other examples, downlink transmission, uplink transmission, P2P transmission, or D2D transmission.

[0056]

[0068] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to utilize techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be placed together in an antenna assembly such as an antenna tower. In some examples, the antennas or antenna arrays associated with base station 105 may be located in diverse geographical locations. Base station 105 may have an antenna array having several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. As an addition or alternative, an antenna panel may support radio frequency beamforming for signals transmitted through antenna ports.

[0057]

[0069] Beamforming, sometimes called spatial filtering, directional transmission, or directional reception, is a signal processing technique that can be used in a transmitting or receiving device (e.g., base station 105, UE115) to shape or steer an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals communicated through the antenna elements of an antenna array such that several signals propagating in a particular direction relative to the antenna array are reinforced, while other signals are destructively interfered with. The coordination of signals communicated through antenna elements may include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried through the antenna elements associated with the device. The coordination associated with each antenna element may be defined by a beamforming weight set associated with a particular direction (e.g., relative to the antenna array of the transmitting or receiving device, or to several other directions).

[0058]

[0070] In the wireless communication system 100, the UEs 115 can be classified based on their capabilities. Figure 2 shows an example of different categories of UEs 200 according to aspects of this disclosure. Some UEs 115 may be classified as URLLC UEs 205, and some UEs 115 may be classified as enhanced mobile broadband (eMBB) UEs 210 (e.g., premium smartphones). URLLC UEs 205 and eMBB UEs 210 may support communication on 5G (e.g., premium 5G) or NR networks. Some other UEs 115 may be classified as low-power wide-area (LPWA) large-scale MTC (mMTC) UEs 215. LPWA mMTC UEs 215 may support communication on LTE networks. In addition to these UEs 115, some other UEs 115 in the wireless communication system 100 may be classified as NR Lite UEs 220.

[0059]

[0071] In some aspects, it may be appropriate to find more efficient and cost-effective ways to scale and deploy certain networks (e.g., NR networks). For example, reliability requirements may be relaxed so that certain networks can achieve peak throughput and minimum latency. These networks may be associated with improved efficiency (e.g., power consumption and system overhead) and lower costs. Furthermore, in some examples, these networks may support UE115s classified as NR Lite UE220s, which may be associated with reduced capability and lower costs. NR Lite UE220s are sometimes referred to as RedCap UE115s. RedCap UE115s may include wearables, industrial wireless sensor networks (IWSNs), surveillance cameras, and low-end smartphones. Furthermore, the RedCap UE115 may operate over a large frequency bandwidth (e.g., 20 MHz or up to 100 MHz), while other UE115s such as the NB-IoT UE and eMTC UE115 may operate over a narrow bandwidth (e.g., one resource block or six resource blocks).

[0060]

[0072] In some cases, the RedCap UE115 may support low-spectrum efficiency and scalable numerology, as well as communication using time-division duplex (TDD) and frequency-division duplex (FDD) in full-duplex (FD) or half-duplex (HD) modes. When using FDD, the RedCap UE115 may communicate with base station 105 over the paired spectrum. The paired spectrum may include a first frequency band for uplink communication and a second frequency band for downlink communication. When using TDD, the RedCap UE115 may communicate with base station 105 off-paired spectrum; that is, the RedCap UE115 may transmit on the uplink and receive on the downlink on the same carrier.

[0061]

[0073] Figure 3 shows an example of a half-duplex frequency division duplex (FDD) 300 according to an aspect of this disclosure. Since some RedCap UE115s can operate in half-duplex mode, these UE115s can achieve lower cost, power savings, and lower noise figure and insertion loss. In some cases, cost savings can be achieved by replacing the duplexer in the half-duplex UE115 with a switch. Switches can be less expensive than duplexers, and since the UE may have multiple duplexers to support full-duplex across different bandwidths, the cost savings gain can scale up with multiband support. Furthermore, since the transceiver chain in the half-duplex UE115 may be in a low-power state when communication is moving in opposite directions, power savings can be achieved by sequential toggling of the transmit phase-locked loop (PLL) and receive PLL.

[0062]

[0074] In Figure 3, the half-duplex UE115 can transmit on the uplink over the first carrier 305 and receive on the downlink over the second carrier 310. For example, the half-duplex UE115 can transmit on the uplink over the first carrier 305 during the first time period 315-a, receive on the downlink over the second carrier 310 during the second time period 315-b, and transmit on the uplink over the first carrier 305 during the third time period 315-c. When transitioning from uplink transmission to downlink reception, the half-duplex UE115 can lock the transmit PLL. Similarly, when transitioning from downlink reception to uplink transmission, the half-duplex UE115 can lock the receive PLL. By supporting half-duplex mode FDD, the half-duplex UE115 can achieve lower latency and higher throughput, in addition to more flexible downlink and uplink switching positions.

[0063]

[0075] In some aspects, in addition to or as an alternative to FDD, the half-duplex UE 115 may communicate with the base station 105 using TDD. In such aspects, the half-duplex UE 115 may be configured with a slot format indicating which slots will be used for uplink, which slots will be used for downlink, and which slots are flexible. When a TDD slot includes downlink symbols and uplink symbols, the flexible symbols may be configured between the downlink symbols and the uplink symbols (e.g., when the downlink switches to uplink), and there may be at least one flexible symbol between the downlink symbols and the uplink symbols (e.g., the minimum number of flexible symbols may be equal to 1). Further, the flexible symbols may not be configured between the uplink symbols and the downlink symbols (e.g., when the uplink switches to downlink).

[0064]

[0076] The UE 115 may transmit an uplink signal using timing advance, but since it may take some time for the downlink signal to reach the UE 115, the flexible symbols may be configured when the downlink switches to uplink and may not be configured when the uplink switches to downlink. FIG. 4 shows an example of timing advance 400 during TDD according to an aspect of the present disclosure. The UE 115 may transmit an uplink frame 410 to the base station prior to the downlink frame 405 such that the uplink frame 410 aligns with the downlink frame 405 at the base station 105. In some cases, the UE 115 may calculate a timing advance for uplink transmission to the base station 105 based on one or more values. In some examples, the base station 105 may indicate a value of N TA to the UE 115, but the value of N TA,offset may vary. Further, T cThis can refer to the basic unit of time in a wireless communication system. Then, UE115 can use these values ​​to calculate the timing advance for uplink transmission to base station 105.

[0065]

[0077] Tables 1, 2, and 3 below show the peak data rates in different duplication modes. For a RedCap UE115 with one transmitter and one receiver (1T1R), the RedCap UE115 may use a maximum modulation order of 64 quadrature amplitude modulation (QAM) and a maximum code rate of 948 / 1024, and the RedCap UE115 can achieve a downlink overhead of 0.14 and an uplink overhead of 0.08. In NR TDD, the RedCap UE115 may be configured in a DDSU slot format, where "D" corresponds to a downlink symbol, "S" corresponds to a special symbol, and "U" corresponds to an uplink symbol (for example, format 28 has one "S" symbol, n f =1). In NR type-A HD-FDDs, the RedCap UE115 may be configured using a switching gap between the downlink and uplink (for example, when the downlink switches to the uplink), and the switching gap may be based on the subcarrier spacing (SCS). g For a 15kHz SCS where =1, the RedCap UE115 cannot experience loss with respect to format 28, but n g For a 30kHz SCS with =2, the RedCap UE115 may experience a 3% loss with respect to format 28. The RedCap UE115 also has several guard symbols, n g Format 28, where =1, or n g It can be configured using a DDSU slot format such as format 29, where =2. Therefore, similar latency and throughput may exist for TDD and FDD.

[0066] [Table 1]

[0067] [Table 2]

[0068] [Table 3]

[0069]

[0078] In the wireless communication system 100, UE 115 may use a random access procedure to establish or re-establish a connection with base station 105. As part of the random access procedure, UE 115 may transmit a random access preamble to base station 105 in response to an SSB received from base station 105. Base station 105 may transmit a set of SSBs associated with different beams. UE 115 may select an SSB from the set of SSBs if, for example, a measurement performed on the SSB (e.g., RSRP) satisfies a threshold (e.g., RSRP threshold). Since UE 115 may receive each SSB on a different beam, the selection of an SSB may correspond to selecting a beam for communication with base station 105. However, in some cases, an RO paired with the selected SSB may quickly follow the SSB received by UE 115. As an addition or alternative, UE 115 may receive another downlink transmission shortly before the RO. As a result, the random access procedure in UE115 may be delayed because UE115 may not have enough time to transition to transmit mode for sending a random access preamble in RO in response to the selected SSB. The wireless communication system 100 may support efficient techniques to facilitate the random access procedure between UE115 and base station 105.

[0070]

[0079] Figure 5 shows an example of a wireless communication system 500 supporting RO selection for a RedCap UE according to an aspect of the present disclosure. The wireless communication system 500 includes UE115-a, which may be an example of UE115 as described with reference to Figure 1. For example, UE115-a may be an example of RedCap UE115 as described with reference to Figures 1 to 5. The wireless communication system 500 also includes base station 105-a, which may be an example of base station 105 as described with reference to Figure 1. UE115-a may communicate with base station 105-a on the resources of carrier 505 and carrier 510 (which may correspond to different carriers or the same carrier, for example). The wireless communication system 500 may implement aspects of the wireless communication system 100. For example, the wireless communication system 500 may support efficient techniques for facilitating random access procedures between UE115-a and base station 105-a.

[0071]

[0080] In the example in Figure 5, base station 105-a may transmit system information or radio resource control (RRC) signaling to UE115-a indicating a configuration for communicating with UE115-a. UE115-a may then decode the system information or RRC signaling and obtain an uplink bandwidth portion (BWP) for transmission to base station 105-a and a random-access channel (RACH) configuration for UE115-a. The RACH configuration may include physical RACH (PRACH) resources, a mapping pattern, parameters for RO verification, one or more RO selection rules, and power control parameters. The mapping pattern may be called an SSB-to-PRACH mapping pattern or SSB-to-RO mapping, and may map a set of SSBs to one or more sets of ROs in which UE115-a can transmit a random-access preamble.

[0072]

[0081] Base station 105-a may present separate SSB-to-PRACH mapping patterns for RedCap UE115 and non-RedCap UE115 (e.g., UE115-a). For example, base station 105-a may include different parameters in the system information for RedCap UE115 and non-RedCap UE115 (e.g., ssb-perRACH-OccasionAndCB-PreamblesPerSSB, ra-ssb-OccasionMaskIndex, etc.). Alternatively, base station 105-b may present a common SSB-to-RO mapping pattern for RedCap UE115 and non-RedCap UE115. Depending on the configuration, base station 105-a may ensure that PRACH resources allocated for RedCap UE115 (e.g., half-duplex and full-duplex RedCap UEs) can be mapped to all SSBs indicated in the system information within the SSB-to-RO association pattern period (e.g., by ssb-PositionsInBurst in system information block one (SIB1) or in ServingCellConfigCommon) (e.g., assuming RedCap UE115 is not capable of full-duplex operation). Furthermore, depending on the configuration, base station 105-a (e.g., the network) may be configured such that the SSB-to-RO association pattern periods for RedCap UE115 and non-RedCap UEs are the same or different.

[0073]

[0082] After UE115-a identifies an individual SSB-to-RO mapping (e.g., an SSB-to-RO mapping for RedCap UE115), it may be appropriate for UE115-a to verify the ROs in the SSB-to-RO mapping (depending on, for example, the redundancy mode, parameters for RO verification, and the capabilities of the UE). Alternatively, base station 105-a may verify the ROs in the SSB-to-RO mapping before transmitting it to UE115-a, and UE115-a may assume that all allocated ROs are valid. In either case, it may be appropriate for the valid ROs of RedCap UE115 to satisfy several conditions. For example, a valid RO does not have to precede an SSB (e.g., a synchronization signal or physical broadcast channel (PBCH) block) in a slot (e.g., a PRACH slot). Furthermore, a valid RO may start at least a threshold duration after the last symbol in which the SSB is received (e.g., the last SSB received symbol).

[0074]

[0083] In Figure 5, base station 105-a may transmit SSB515 to UE115-a, and RO520 may be effective for transmitting a random access preamble (e.g., a PRACH preamble) if RO520 follows SSB515 for a threshold duration. That is, RO520 may be effective if the gap 525 between SSB515 and RO520 is greater than or equal to the threshold duration. The threshold duration is N gap,RC It can correspond to a set of symbols that are represented as symbols. If UE115-a is executing the RACH procedure using FDD (for example, on the pair spectrum), then N gap,RC This may depend on the numerology and UE capabilities of the PRACH preamble (e.g., the capabilities of UE115-a). If UE115-a is performing the RACH procedure using TDD (e.g., on an unpaired spectrum), then N gap,RCThis may depend on the numerology of the PRACH preamble, the UE capability (e.g., the capability of the UE115-a), and the radio frequency switching time in the UE115-a (e.g., when the center frequencies of the downlink and uplink BWP pairs are not matched).

[0075]

[0084] In one embodiment, the threshold duration may be greater than the minimum receive-to-transmit (RX-to-TX) switching time for a half-duplex FDD. That is, T symbol N gap,RC (For example, in TDD) may be greater than the minimum RX-to-TX switching time, T symbol This represents the duration of the symbol and is based on the reference SCS of the PRACH slot. In this embodiment, base station 105-a sends to UE115-a, N gap,RC It can transmit signals (for example, N gap,RC This can be specified by a look-up table (LUT), or signaled in system information (e.g., SIB1), or both. In another embodiment, the threshold duration may be equal to the duration configured in UE115-a for RX-to-TX switching (e.g., N of TDD). gap,RC =N gap or N flexible ).

[0076]

[0085] Once the RO in the SSB-to-RO mapping is verified, UE115-a may, in response to SSB515, select RO520 for transmitting a RACH preamble to base station 105-a. That is, UE115-a may select RO520 from the valid ROs. Furthermore, UE115-a may perform RO selection according to the synchronization signal (SS)RSRP (SS-RSRP) measurement and the power class and antenna efficiency of UE115-a. UE115-a may also perform priority or collision handling for PRACH transmission (e.g., using RO reselection or cancellation in case of collision). After selecting RO520, UE115-a may transmit a RACH preamble to base station 105-a on RO520 (e.g., a power-controlled PRACH transmission during an uplink BWP assigned to UE115-a). In some cases, half-duplex and full-duplex RedCap UE115s may follow the same or different rules when selecting an RO from a valid RO to transmit a RACH preamble within (for example, for directional collision handling).

[0077]

[0086] In one embodiment, half-duplex and full-duplex RedCap UE115s may follow different rules when selecting RO520. In this embodiment, the half-duplex RedCap UE115 has at least N RO520. gap,RCIf there are multiple symbols, a RACH preamble may be transmitted on a valid RO after the last downlink symbol (e.g., PDCCH, PDSCH, channel state information reference signal (CSI-RS), tracking reference signal (TRS), or positioning reference signal (PRS)). Furthermore, a half-duplex RedCap UE115 may transmit a RACH preamble on a valid RO if the reference signal received power (RSRP) of the SSB preceding the RO exceeds a threshold (γ1) preconfigured by the base station 105-a (e.g., the network), where the threshold (γ1) is a function of the power class, antenna efficiency, and other capabilities of the UE115-a. Alternatively, the full-duplex UE115 can transmit a RACH preamble over an active RO if the RSRP of the SSB preceding the RO exceeds a pre-configured threshold (γ2) by the base station 105-a (e.g., the network), where threshold (γ2) is a function of the power class, antenna efficiency, and other capabilities of the UE115-a.

[0078]

[0087] In another embodiment, half-duplex and full-duplex RedCap UE115s may follow the same rules when selecting RO520. In this embodiment, the half-duplex or full-duplex RedCap UE115 has at least N RO520. gap,RCIf there are multiple symbols, a RACH preamble may be transmitted on an active RO after the last downlink symbol (e.g., PDCCH, PDSCH, Channel Status Information Reference Signal (CSI-RS), Tracking Reference Signal (TRS), or Positioning Reference Signal (PRS)). Furthermore, a half-duplex or full-duplex RedCap UE115 may transmit a RACH preamble on an active RO if the RSRP of the SSB preceding the RO exceeds a threshold (γ1) preconfigured by the base station 105-a (e.g., the network), where threshold (γ1) is a function of the power class, antenna efficiency, and other capabilities of the UE115-a.

[0079]

[0088] Figure 6 shows an example of a process flow 600 supporting RO selection for a RedCap UE according to an aspect of this disclosure. The process flow 600 includes UE115-b, which may be an example of UE115 as described with reference to Figures 1 to 5. For example, UE115-b may be an example of RedCap UE115 as described with reference to Figures 1 to 5. The process flow 600 also includes base station 105-b, which may be an example of base station 105 as described with reference to Figures 1 to 5. The process flow 600 may implement an aspect of a wireless communication system 500. For example, the process flow 600 may support an efficient technique for facilitating a random access procedure between UE115-b and base station 105-b.

[0080]

[0089] In the following description of process flow 600, the signal transmissions exchanged between UE115-b and base station 105-b may be transmitted in an order different from the illustrative order shown, or the operations performed by UE115-b and base station 105-b may be performed in a different order or at different times. Some operations may also be omitted from process flow 600, and other operations may be added to process flow 600.

[0081]

[0090] In 605, base station 105-b may transmit and UE115-b may receive system information indicating a first mapping of a set of SSBs to a first set of ROs (e.g., an SSB-to-RO mapping for a RedCap UE) and a second mapping of a set of SSBs to a second set of ROs (e.g., an SSB-to-RO mapping for another UE). UE115-b may then, based on its capabilities, identify the first mapping of a set of SSBs to a first set of ROs (e.g., a separate mapping directed to UE115-b). For example, the system information may include a header identifying an SSB-to-RO mapping for a RedCap UE, and UE115-b may decode the header and identify the SSB-to-RO mapping for a RedCap UE. Alternatively, UE115-b may identify the SSB-to-RO mapping for a RedCap UE based on the location of the mapping in the system information. In 610, base station 105-b may transmit a set of SSBs, and UE 115-b may receive one or more SSBs from the set of SSBs.

[0082]

[0091] In some cases, in 615, UE115-b may identify a subset of sets of ROs from which to select an RO, based on the duration between the last received SSB of one or more SSBs and each RO in a subset of the set of ROs satisfying a threshold duration. Furthermore, UE115-b may identify a subset of sets of ROs from which to select an RO, based on excluding ROs from sets of ROs that precede the SSB in the slot. That is, UE115-b may verify a subset of sets of ROs. In other cases, base station 105-b may identify a subset of sets of ROs from which UE115-b selects an RO, based on the duration between the last transmitted SSB of the set of SSBs and each RO in a first set of ROs satisfying a threshold duration. That is, base station 105-b may verify an RO. Next, base station 105-b may transmit in system information an instruction for a subset of sets of ROs for selecting an RO from there, and UE 115-b may receive that instruction (for example, SSB-to-RO mapping may map a set of SSBs to valid ROs).

[0083]

[0092] In 620, UE115-b may select an RO for transmitting a random access preamble in one of the SSBs based on the RSRP of one or more SSBs meeting a threshold. UE115-b may also select an RO based on the duration between the last received downlink transmit and the RO meeting a threshold duration. In some cases, UE115-b may be configured to operate in half-duplex mode, where the last received downlink transmit may include a control channel transmit, a data channel transmit, or a reference signal transmit. In 625, UE115-b may then transmit a random access preamble in an RO selected from a subset of the set of ROs associated with one or more SSBs (i.e., the RO selected in 620), which base station 105-b may receive.

[0084]

[0093] In some cases, base station 105-b may transmit a threshold duration instruction based on the capabilities of UE115-b, which UE115-b may receive. In one embodiment, the threshold duration may be equal to the duration configured in UE115-b for switching from receive mode to transmit mode in TDD mode. In another embodiment, the threshold duration may satisfy the minimum time for UE115-b to transition from receive mode to transmit mode. If UE115-b is configured to use FDD, the minimum time for UE115-b to transition from receive mode to transmit mode may be based on the numerology used for the random access preamble, the capabilities of UE115-b, or both. If UE115-b is configured to use TDD, the minimum time for UE115-b to transition from receive mode to transmit mode may be based on the numerology used for the random access preamble, the capabilities of UE115-b, the radio frequency switching time in UE115-b, or a combination thereof.

[0085]

[0094] Figure 7 shows a block diagram 700 of a device 705 supporting RO selection for a RedCap UE according to an aspect of this disclosure. Device 705 may be an example of an aspect of the UE 115 described herein. Device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. Device 705 may also include a processor. Each of these components may communicate with one another (for example, via one or more buses).

[0086]

[0095] The receiver 710 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels regarding RO selection for RedCap UE), user data, control information, or any combination thereof. The information may be passed to other components of device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.

[0087]

[0096] The transmitter 715 may provide means for transmitting signals generated by other components of device 705. For example, the transmitter 715 may transmit information such as packets associated with various information channels (e.g., control channel, data channel, information channel for RO selection for RedCap UE), user data, control information, or any combination thereof. In some examples, the transmitter 715 may be placed juxtaposed with the receiver 710 in the transceiver module. The transmitter 715 may use a single antenna or a set of multiple antennas.

[0088]

[0097] The communication manager 720, receiver 710, transmitter 715, or various combinations thereof or various components thereof may be examples of means for performing various aspects of RO selection for RedCap UE as described herein. For example, the communication manager 720, receiver 710, transmitter 715, or various combinations thereof or components thereof may support a method for performing one or more of the functions described herein.

[0089]

[0098] In some examples, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in hardware (for example, in a communications management circuit). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, individual gates or transistor logic, individual hardware components, or any combination thereof that constitutes, or otherwise supports, means for performing the functions described herein. In some examples, a processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (for example, by the processor executing instructions stored in memory).

[0090]

[0099] In addition or alternatively, in some examples, the communications manager 720, receiver 710, transmitter 715, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communications management software or firmware). When implemented in code executed by a processor, the functions of the communications manager 720, receiver 710, transmitter 715, or various combinations or components thereof may be performed by a general-purpose processor, DSP, central processing unit (CPU), ASIC, FPGA, or any combination thereof or other programmable logic devices (e.g., configured as means for performing the functions described herein, or otherwise supporting such means).

[0091]

[0100] In some examples, the communications manager 720 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using, or possibly in cooperation with, the receiver 710, the transmitter 715, or both. For example, the communications manager 720 may receive information from the receiver 710 and transmit information to the transmitter 715, or it may be integrated with the receiver 710, the transmitter 715, or both to receive information, transmit information, or perform various other operations as described herein.

[0092]

[0101] The communication manager 720 may support wireless communication in the UE according to the examples disclosed herein. For example, the communication manager 720 may be configured as a means for receiving, or otherwise supporting, a message containing a plurality of mappings of each set of synchronization signal blocks to each set of random access channel opportunities. The communication manager 720 may be configured as a means for receiving, or otherwise supporting, one or more synchronization signal blocks from a set of synchronization signal blocks, the set of synchronization signal blocks being identified from each set of synchronization signal blocks according to one of a plurality of mappings determined based on the capabilities of the UE, and the set of synchronization signal blocks being associated with a set of random access channel opportunities. The communication manager 720 may be configured as a means for transmitting a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronization signal blocks, the random access channel opportunity being selected from a subset of the set of random access channel opportunities based on the duration between the last received downlink transmission and the random access channel opportunity satisfying a threshold duration.

[0093]

[0102] By including or configuring the communications manager 720 according to the examples described herein, the device 705 (e.g., a processor controlling the receiver 710, transmitter 715, communications manager 720, or a combination thereof, or otherwise coupled thereto) can support techniques for reducing processing load, reducing power consumption, and more efficient use of communications resources. In particular, the half-duplex RedCap UE115 can efficiently select the RO for transmitting the RACH preamble in which it can complete random access procedures faster, resulting in power savings and less wasted resources.

[0094]

[0103] Figure 8 shows a block diagram 800 of device 805 supporting RO selection for RedCap UE according to an aspect of this disclosure. Device 805 may be an example of an aspect of device 705 or UE 115 described herein. Device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. Device 805 may also include a processor. Each of these components may communicate with one another (for example, via one or more buses).

[0095]

[0104] Receiver 810 may provide means for receiving information such as packets associated with various information channels (e.g., control channel, data channel, information channel for RO selection for RedCap UE), user data, control information, or any combination thereof. The information may be passed to other components of device 805. Receiver 810 may utilize a single antenna or a set of multiple antennas.

[0096]

[0105] Transmitter 815 may provide means for transmitting signals generated by other components of device 805. For example, transmitter 815 may transmit information such as packets associated with various information channels (e.g., control channel, data channel, information channel for RO selection for RedCap UE), user data, control information, or any combination thereof. In some examples, transmitter 815 may be placed juxtaposed with receiver 810 in the transceiver module. Transmitter 815 may use a single antenna or a set of multiple antennas.

[0097]

[0106] Device 805 or its various components may be examples of means for performing various embodiments of RO selection for RedCap UE as described herein. For example, the communications manager 820 may include the RO configuration manager 825, the SSB manager 830, the random access preamble manager 835, or any combination thereof. The communications manager 820 may be an example of an embodiment of the communications manager 720 as described herein. In some examples, the communications manager 820 or its various components may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using, or possibly in cooperation with, the receiver 810, the transmitter 815, or both. For example, the communications manager 820 may receive information from the receiver 810 and transmit information to the transmitter 815, or may be integrated with the receiver 810, the transmitter 815, or both to receive information, transmit information, or perform various other operations as described herein.

[0098]

[0107] The communications manager 820 may support wireless communications in the UE according to the examples disclosed herein. The RO configuration manager 825 is configured as a means for receiving, or otherwise supporting, a message containing multiple mappings of each set of synchronization signal blocks to each set of random access channel opportunities. The SSB manager 830 is configured as a means for receiving, or otherwise supporting, a set of synchronization signal blocks, each set of synchronization signal blocks is identified from each set of synchronization signal blocks according to one of multiple mappings determined based on the capabilities of the UE, and the set of synchronization signal blocks is associated with a set of random access channel opportunities. The random access preamble manager 835 is configured as a means for transmitting a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronization signal blocks, the random access channel opportunity is selected from a subset of the set of random access channel opportunities based on the duration between the last received downlink transmission and the random access channel opportunity satisfying a threshold duration.

[0099]

[0108] Figure 9 shows a block diagram 900 of a communications manager 920 supporting RO selection for a RedCap UE according to an aspect of this disclosure. The communications manager 920 may be an example of communications manager 720, communications manager 820, or both aspects described herein. The communications manager 920 or various components thereof may be an example of means for performing various aspects of RO selection for a RedCap UE as described herein. For example, the communications manager 920 may include an RO configuration manager 925, an SSB manager 930, a random access preamble manager 935, an SSB-to-RO mapper 940, an RO validator 945, an RO timing manager 950, an RO selector 955, or any combination thereof. Each of these components may communicate with one another directly or indirectly (e.g., via one or more buses).

[0100]

[0109] The communications manager 920 may support wireless communications in the UE according to the examples disclosed herein. The RO configuration manager 925 is configured as a means for receiving, or otherwise supporting, a message containing multiple mappings of each set of synchronization signal blocks to each set of random access channel opportunities. The SSB manager 930 is configured as a means for receiving, or otherwise supporting, a set of synchronization signal blocks, each set of synchronization signal blocks is identified from each set of synchronization signal blocks according to one of multiple mappings determined based on the capabilities of the UE, and the set of synchronization signal blocks is associated with a set of random access channel opportunities. The random access preamble manager 935 is configured as a means for transmitting a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronization signal blocks, the random access channel opportunity is selected from a subset of the set of random access channel opportunities based on the duration between the last received downlink transmission and the random access channel opportunity satisfying a threshold duration.

[0101]

[0110] In some examples, the RO configuration manager 925 may receive instructions on the uplink bandwidth portion for the UE to send a random access preamble based on the UE's capabilities. In some examples, the RO validator 945 may be configured, or otherwise support such means, for identifying a subset of the set of random access channel opportunities for selecting a random access channel opportunity from there, based on whether the duration between one or more synchronization signal blocks and each random access channel opportunity in the subset of the set of random access channel opportunities satisfies a threshold duration.

[0102]

[0111] In some examples, identifying a subset of the set of random access channel opportunities for selecting a random access channel opportunity from there is further based on excluding random access channel opportunities from the set of random access channel opportunities that precede the synchronization signal block in the slot.

[0103]

[0112] In some examples, the UE is configured to operate in half-duplex mode based on its capabilities. In some examples, the last received downlink transmit includes a control channel transmit, a data channel transmit, or a reference signal transmit.

[0104]

[0113] In some examples, to support receiving messages, the RO configuration manager 925 may be configured to receive, or otherwise support, a means for receiving instructions in a message for selecting a subset of random access channel opportunities from which to select a random access channel opportunity, based on the duration between the last received synchronization signal block of one or more synchronization signal blocks and each random access channel opportunity in the subset of the set of random access channel opportunities satisfying a threshold duration.

[0105]

[0114] In some examples, the threshold duration satisfies the minimum time required for the UE to transition from receive mode to transmit mode.

[0106]

[0115] In some examples, the UE is configured to utilize frequency division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode is based on the numerology used for the random access preamble, the capabilities of the UE, or both.

[0107]

[0116] In some examples, the UE is configured to utilize time-division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode is based on the numerology used for the random access preamble, the capabilities of the UE, the radio frequency switching time in the UE, or a combination thereof.

[0108]

[0117] In some examples, the threshold duration is equal to the duration configured in the UE to switch from receive mode to transmit mode in time-division duplex mode.

[0109]

[0118] In some examples, the RO timing manager 950 may be configured as a means for receiving threshold duration instructions based on the capabilities of the UE, or may otherwise support such means, and random access channel opportunities are selected based on receiving threshold duration instructions.

[0110]

[0119] In some examples, the RO selector 955 may be configured, or otherwise support such a means, for selecting a random access channel opportunity to transmit a random access preamble within one of one or more synchronization signal blocks based on whether a reference signal received power measurement of one of the synchronization signal blocks satisfies a threshold.

[0111]

[0120] In some examples, the message includes system information messages or radio resource control messages. In some examples, the UE's capabilities include reduced capabilities. In some examples, a set of synchronization signal blocks is indicated by ssb-PositionsInBurst in system information block 1 or in ServingCellConfigCommon.

[0112]

[0121] Figure 10 shows a diagram of system 1000 including a device 1005 that supports RO selection for RedCap UE according to an aspect of this disclosure. Device 1005 may be an example of, or include, a component of, device 705, device 805, or UE 115 as described herein. Device 1005 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1005 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communications manager 1020, an input / output (I / O) controller 1010, a transceiver 1015, an antenna 1025, a memory 1030, a code 1035, and a processor 1040. These components may communicate electronically via one or more buses (e.g., bus 1045), or may be coupled in some cases (e.g., operably, communicatively, functionally, electronically, electrically).

[0113]

[0122] The I / O controller 1010 may manage input and output signals for device 1005. The I / O controller 1010 may also manage peripheral devices not integrated with device 1005. In some cases, the I / O controller 1010 may represent physical connections or ports to external peripheral devices. In some cases, the I / O controller 1010 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, the I / O controller 1010 may represent, or interact with, a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 1010 may be implemented as part of a processor, such as processor 1040. In some cases, the user may interact with device 1005 via the I / O controller 1010 or via hardware components controlled by the I / O controller 1010.

[0114]

[0123] In some cases, device 1005 may include a single antenna 1025. However, in some other cases, device 1005 may have two or more antennas 1025, which may be capable of simultaneously transmitting or receiving multiple wireless transmissions. Transceiver 1015 may communicate bidirectionally via one or more antennas 1025, a wired link, or a wireless link, as described herein. For example, transceiver 1015 may represent a wireless transceiver and communicate bidirectionally with another wireless transceiver. Transceiver 1015 may also include a modem for modulating packets and providing the modulated packets to one or more antennas 1025 for transmission, and for demodulating packets received from one or more antennas 1025. Transceiver 1015, or transceiver 1015 and one or more antennas 1025, may be examples of transmitters 715, 815, 710, 810, or any combination thereof or components thereof, as described herein.

[0115]

[0124] Memory 1030 may include random access memory (RAM) and read-only memory (ROM). Memory 1030 may store computer-readable computer-executable code 1035, which, when executed by processor 1040, includes instructions that cause device 1005 to perform various functions described herein. Code 1035 may be stored in a non-temporary computer-readable medium, such as system memory or another type of memory. In some cases, code 1035 may not be directly executable by processor 1040, but (for example, when compiled and executed) can cause the computer to perform the functions described herein. In some cases, memory 1030 may include a basic I / O system (BIOS) that can control basic hardware or software operations, in particular, interactions with peripheral components or peripheral devices.

[0116]

[0125] The processor 1040 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 1040 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated with the processor 1040. The processor 1040 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., functions or tasks supporting RO selection for RedCap UE). For example, device 1005 or a component of device 1005 may include the processor 1040 and memory 1030 coupled to the processor 1040, and the processor 1040 and memory 1030 are configured to perform various functions described herein.

[0117]

[0126] The communication manager 1020 may support wireless communication in the UE according to the examples disclosed herein. For example, the communication manager 1020 may be configured as a means for receiving, or otherwise supporting, a message containing a plurality of mappings of each set of synchronization signal blocks to each set of random access channel opportunities. The communication manager 1020 may be configured as a means for receiving, or otherwise supporting, one or more synchronization signal blocks from a set of synchronization signal blocks, the set of synchronization signal blocks being identified from each set of synchronization signal blocks according to one of a plurality of mappings determined at least in part on the capabilities of the UE, and the set of synchronization signal blocks being associated with a set of random access channel opportunities. The communication manager 1020 may be configured as a means for transmitting a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronization signal blocks, the random access channel opportunity being selected from a subset of the set of random access channel opportunities based on the duration between the last received downlink transmission and the random access channel opportunity satisfying a threshold duration.

[0118]

[0127] By including or configuring the communication manager 1020 in accordance with the examples described herein, device 1005 can support techniques for reduced processing, reduced power consumption, and more efficient use of communication resources. In particular, the half-duplex RedCap UE 115 can efficiently select the RO for transmitting the RACH preamble in which it can complete random access procedures faster, resulting in power savings and less wasted resources.

[0119]

[0128] In some examples, the communications manager 1020 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using, or otherwise cooperating with, the transceiver 1015, one or more antennas 1025, or a combination thereof. Although the communications manager 1020 is shown as a separate component, in some examples, one or more functions described with respect to the communications manager 1020 may be supported or performed by the processor 1040, memory 1030, code 1035, or a combination thereof. For example, code 1035 may include instructions executable by the processor 1040 that cause device 1005 to perform various aspects of RO selection for the RedCap UE described herein, or the processor 1040 and memory 1030 may, in some cases, be configured to perform or support such operations.

[0120]

[0129] Figure 11 shows a block diagram 1100 of a device 1105 supporting RO selection for RedCap UE according to an aspect of this disclosure. Device 1105 may be an example of an aspect of a base station 105 as described herein. Device 1105 may include a receiver 1110, a transmitter 1115, and a communications manager 1120. Device 1105 may also include a processor. Each of these components may communicate with one another (for example, via one or more buses).

[0121]

[0130] Receiver 1110 may provide means for receiving information such as packets associated with various information channels (e.g., control channel, data channel, information channel for RO selection for RedCap UE), user data, control information, or any combination thereof. The information may be passed to other components of device 1105. Receiver 1110 may utilize a single antenna or a set of multiple antennas.

[0122]

[0131] The transmitter 1115 may provide means for transmitting signals generated by other components of device 1105. For example, the transmitter 1115 may transmit information such as packets associated with various information channels (e.g., control channel, data channel, information channel for RO selection for RedCap UE), user data, control information, or any combination thereof. In some examples, the transmitter 1115 may be placed juxtaposed with the receiver 1110 in the transceiver module. The transmitter 1115 may use a single antenna or a set of multiple antennas.

[0123]

[0132] The communication manager 1120, receiver 1110, transmitter 1115, or various combinations thereof or various components thereof may be examples of means for performing various aspects of RO selection for RedCap UE as described herein. For example, the communication manager 1120, receiver 1110, transmitter 1115, or various combinations thereof or components thereof may support a method for performing one or more of the functions described herein.

[0124]

[0133] In some examples, the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be implemented in hardware (for example, in a communications management circuit). The hardware may include a processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gates or transistor logic, discrete hardware components, or any combination thereof that constitutes, or otherwise supports, means for performing the functions described herein. In some examples, a processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (for example, by the processor executing instructions stored in memory).

[0125]

[0134] In addition or alternatively, in some examples, the communications manager 1120, receiver 1110, transmitter 1115, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communications management software or firmware). When implemented in code executed by a processor, the functions of the communications manager 1120, receiver 1110, transmitter 1115, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, or any combination thereof or other programmable logic devices (e.g., configured as means for performing the functions described in this disclosure, or otherwise supporting such means).

[0126]

[0135] In some examples, the communications manager 1120 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using, or possibly in cooperation with, the receiver 1110, the transmitter 1115, or both. For example, the communications manager 1120 may receive information from the receiver 1110 and transmit information to the transmitter 1115, or it may be integrated with the receiver 1110, the transmitter 1115, or both to receive information, transmit information, or perform various other operations as described herein.

[0127]

[0136] The communication manager 1120 may support wireless communication at a base station in accordance with the examples disclosed herein. For example, the communication manager 1120 may be configured, or otherwise support such means, for transmitting a message to a set of multiple UEs that includes a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of multiple UEs having a first capability, and a second mapping of a set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of multiple UEs having a second capability. The communication manager 1120 may also be configured, or otherwise support such means, for transmitting a set of synchronization signal blocks. In response to transmitting a set of synchronization signal blocks, the communication manager 1120 may be configured, or otherwise support such means, for receiving a random access preamble from one of the multiple UEs in a random access channel opportunity selected from the first set of random access channel opportunities, according to a first mapping at least partially based on a first capability UE.

[0128]

[0137] By including or configuring the communications manager 1120 according to the examples described herein, the device 1105 (e.g., a processor controlling the receiver 1110, transmitter 1115, communications manager 1120, or a combination thereof, or otherwise coupled thereto) can support techniques for reducing processing load, reducing power consumption, and more efficient use of communications resources. In particular, the base station 105 can facilitate more efficient random access procedures in the RedCap UE 115, enabling the RedCap UE 115 to efficiently select ROs for transmitting RACH preambles within it, so that these random access procedures can be completed faster, resulting in power savings and less wasted resources in the base station 105.

[0129]

[0138] Figure 12 shows a block diagram 1200 of a device 1205 supporting RO selection for RedCap UE according to an aspect of this disclosure. Device 1205 may be an example of an aspect of device 1105 or base station 105 as described herein. Device 1205 may include a receiver 1210, a transmitter 1215, and a communications manager 1220. Device 1205 may also include a processor. Each of these components may communicate with one another (for example, via one or more buses).

[0130]

[0139] Receiver 1210 may provide means for receiving information such as packets associated with various information channels (e.g., control channel, data channel, information channel for RO selection for RedCap UE), user data, control information, or any combination thereof. The information may be passed to other components of device 1205. Receiver 1210 may utilize a single antenna or a set of multiple antennas.

[0131]

[0140] Transmitter 1215 may provide means for transmitting signals generated by other components of device 1205. For example, transmitter 1215 may transmit information such as packets associated with various information channels (e.g., control channel, data channel, information channel for RO selection for RedCap UE), user data, control information, or any combination thereof. In some examples, transmitter 1215 may be placed juxtaposed with receiver 1210 in the transceiver module. Transmitter 1215 may use a single antenna or a set of multiple antennas.

[0132]

[0141] Device 1205 or its various components may be examples of means for performing various forms of RO selection for the RedCap UE described herein. For example, the communications manager 1220 may include the RO configuration manager 1225, the SSB manager 1230, the random access preamble manager 1235, or any combination thereof. The communications manager 1220 may be an example of a form of the communications manager 1120 described herein. In some examples, the communications manager 1220 or its various components may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using, or possibly in cooperation with, the receiver 1210, the transmitter 1215, or both. For example, the communications manager 1220 may receive information from the receiver 1210 and transmit information to the transmitter 1215, or may be integrated with the receiver 1210, the transmitter 1215, or both to receive information, transmit information, or perform various other operations described herein.

[0133]

[0142] The communications manager 1220 may support wireless communications at a base station in accordance with the examples disclosed herein. The RO configuration manager 1225 may be configured, or otherwise support such means, for transmitting a message to a set of multiple UEs that includes a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of multiple UEs having a first capability, and a second mapping of a set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of multiple UEs having a second capability. The SSB manager 1230 may be configured, or otherwise support such means, for transmitting a set of synchronization signal blocks. The random access preamble manager 1235 may be configured, or otherwise support such means, for receiving a random access preamble from one of the multiple UEs in a random access channel opportunity selected from a first set of random access channel opportunities, in accordance with a first mapping at least partially based on a first capability UE, in response to transmitting a set of synchronization signal blocks.

[0134]

[0143] Figure 13 shows a block diagram 1300 of a communications manager 1320 supporting RO selection for a RedCap UE according to an aspect of this disclosure. The communications manager 1320 may be an example of an aspect of communications manager 1120, communications manager 1220, or both, as described herein. The communications manager 1320 or various components thereof may be an example of means for performing various aspects of RO selection for a RedCap UE as described herein. For example, the communications manager 1320 may include an RO configuration manager 1325, an SSB manager 1330, a random access preamble manager 1335, an RO validator 1340, an RO timing manager 1345, or any combination thereof. Each of these components may communicate with one another directly or indirectly (e.g., via one or more buses).

[0135]

[0144] The communications manager 1320 may support wireless communications at a base station in accordance with the examples disclosed herein. The RO configuration manager 1325 may be configured, or otherwise support such means, for transmitting a message to a set of multiple UEs that includes a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of multiple UEs having a first capability, and a second mapping of a set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of multiple UEs having a second capability. The SSB manager 1330 may be configured, or otherwise support such means, for transmitting a set of synchronization signal blocks. The random access preamble manager 1335 may be configured, or otherwise support such means, for receiving a random access preamble from one of the multiple UEs in a random access channel opportunity selected from a first set of random access channel opportunities, in response to transmitting a set of synchronization signal blocks, according to a first mapping at least partially based on a first capability UE.

[0136]

[0145] In some examples, the RO configuration manager 1325 may send instructions for the uplink bandwidth portion from which the UE should transmit a random access preamble, based on the UE's first capability. In some examples, the RO validator 1340 may be configured, or otherwise support such means, for identifying a first set of random access channel opportunities from which the UE should select a random access channel opportunity, based on whether the duration between the last transmitted synchronization signal block in a set of synchronization signal blocks and each random access channel opportunity in a first set of random access channel opportunities satisfies a threshold duration.

[0137]

[0146] In some examples, the threshold duration satisfies the minimum time required for the UE to transition from receive mode to transmit mode.

[0138]

[0147] In some examples, the UE is configured to utilize frequency division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode is based on the numerology used for the random access preamble, the capabilities of the UE, or both.

[0139]

[0148] In some examples, the UE is configured to utilize time-division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode is based on the numerology used for the random access preamble, the capabilities of the UE, the radio frequency switching time in the UE, or a combination thereof.

[0140]

[0149] In some examples, the UE identifying a first set of random access channel opportunities from which to select a random access channel opportunity is further based on excluding random access opportunities that precede synchronous signal blocks in the slot.

[0141]

[0150] In some examples, the threshold duration is equal to the duration configured in the UE to switch from receive mode to transmit mode in time-division duplex mode.

[0142]

[0151] In some examples, the RO timing manager 1345 is configured as a means for sending threshold duration instructions to the UE based on the UE's capabilities, or may otherwise support such means, and receiving a random access preamble in a random access channel opportunity is based on sending threshold duration instructions.

[0143]

[0152] In some examples, to support receiving a random access preamble, the random access preamble manager 1335 may be configured, or otherwise support such means, for receiving a random access preamble in a random access channel opportunity based on whether a reference signal received power measurement of a synchronization signal block in a set of synchronization signal blocks satisfies a threshold.

[0144]

[0153] In some examples, the message includes a system information message or a wireless resource control message. In some examples, the UE's first capability includes a reduced capability.

[0145]

[0154] Figure 14 shows a diagram of a system 1400 including a device 1405 that supports RO selection for a RedCap UE, according to an aspect of this disclosure. Device 1405 may be, or include, an example of a component of device 1105, device 1205, or base station 105 as described herein. Device 1405 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1405 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communications manager 1420, a network communications manager 1410, a transceiver 1415, an antenna 1425, a memory 1430, a code 1435, a processor 1440, and an inter-station communications manager 1445. These components may communicate electronically via one or more buses (e.g., bus 1450), or may be coupled in some cases (e.g., operably, communicatively, functionally, electronically, electrically).

[0146]

[0155] The network communication manager 1410 may manage communication with the core network 130 (for example, via one or more wired backhaul links). For example, the network communication manager 1410 may manage the transfer of data communications for one or more client devices such as UE 115.

[0147]

[0156] In some cases, device 1405 may include a single antenna 1425. However, in some other cases, device 1405 may have two or more antennas 1425, which may be capable of simultaneously transmitting or receiving multiple wireless transmissions. Transceiver 1415 may communicate bidirectionally via one or more antennas 1425, a wired link, or a wireless link, as described herein. For example, transceiver 1415 may represent a wireless transceiver and communicate bidirectionally with another wireless transceiver. Transceiver 1415 may also include a modem for modulating packets and providing the modulated packets to one or more antennas 1425 for transmission, and for demodulating packets received from one or more antennas 1425. Transceiver 1415, or transceiver 1415 and one or more antennas 1425, may be examples of transmitters 1115, transmitters 1215, receivers 1110, receivers 1210, or any combination thereof or components thereof, as described herein.

[0148]

[0157] Memory 1430 may include RAM and ROM. Memory 1430 may store computer-readable computer-executable code 1435, which, when executed by processor 1440, includes instructions that cause device 1405 to perform various functions described herein. Code 1435 may be stored in a non-temporary computer-readable medium, such as system memory or another type of memory. In some cases, code 1435 may not be directly executable by processor 1440, but (for example, when compiled and executed) can cause the computer to perform the functions described herein. In some cases, memory 1430 may include a BIOS that can control basic hardware or software operations, such as interaction with peripheral components or devices.

[0149]

[0158] The processor 1440 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 1440 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated with the processor 1440. The processor 1440 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks supporting RO selection for RedCap UE). For example, device 1405 or a component of device 1405 may include the processor 1440 and memory 1430 coupled to the processor 1440, and the processor 1440 and memory 1430 are configured to perform various functions described herein.

[0150]

[0159] The inter-station communication manager 1445 may manage communication with other base stations 105 and may include a controller or scheduler for coordinating with other base stations 105 to control communication with the UE 115. For example, the inter-station communication manager 1445 may coordinate scheduling for transmissions to the UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communication manager 1445 may provide an X2 interface within the LTE / LTE-A wireless communication network technology for communication between base stations 105.

[0151]

[0160] The communication manager 1420 may support wireless communication at a base station in accordance with the examples disclosed herein. For example, the communication manager 1420 may be configured, or otherwise support such means, for transmitting a message to a set of multiple UEs that includes a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of multiple UEs having a first capability, and a second mapping of a set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of multiple UEs having a second capability. The communication manager 1420 may also be configured, or otherwise support such means, for transmitting a set of synchronization signal blocks. In response to transmitting a set of synchronization signal blocks, the communication manager 1420 may be configured, or otherwise support such means, for receiving a random access preamble from one of the multiple UEs in a random access channel opportunity selected from the first set of random access channel opportunities, according to a first mapping at least partially based on a first capability UE.

[0152]

[0161] By including or configuring the communications manager 1420 in accordance with the examples described herein, the device 1405 may support techniques for reduced processing, reduced power consumption, and more efficient use of communications resources. In particular, the base station 105 may facilitate more efficient random access procedures in the RedCap UE 115, enabling the RedCap UE 115 to efficiently select ROs for transmitting RACH preambles within it, so that these random access procedures can be completed more quickly, resulting in power savings and less wasted resources in the base station 105.

[0153]

[0162] In some examples, the communications manager 1420 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using, or otherwise cooperating with, the transceiver 1415, one or more antennas 1425, or a combination thereof. Although the communications manager 1420 is shown as a separate component, in some examples, one or more functions described with respect to the communications manager 1420 may be supported or performed by the processor 1440, memory 1430, code 1435, or a combination thereof. For example, code 1435 may include instructions executable by the processor 1440 that cause device 1405 to perform various aspects of RO selection for the RedCap UE described herein, or the processor 1440 and memory 1430 may, in some cases, be configured to perform or support such operations.

[0154]

[0163] Figure 15 shows a flowchart illustrating method 1500 supporting RO selection for a RedCap UE according to aspects of this disclosure. The operation of method 1500 may be performed by a UE or its components as described herein. For example, the operation of method 1500 may be performed by a UE 115 as described with reference to Figures 1 to 10. In some examples, the UE may execute a set of instructions to control a functional element of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using dedicated hardware.

[0155]

[0164] In 1505, the method may include receiving a message containing multiple mappings of each set of synchronization signal blocks to each set of random access channel opportunities. The operation of 1505 may be performed according to examples such as those disclosed herein. In some examples, the operation of 1505 may be performed by an RO configuration manager 925, as described with reference to Figure 9.

[0156]

[0165] In 1510, the method may include receiving one or more synchronous signal blocks from a set of synchronous signal blocks, each set of synchronous signal blocks being identified from the set of synchronous signal blocks according to one of a plurality of mappings determined based on the capabilities of the UE, and each set of synchronous signal blocks being associated with a set of random access channel opportunities. The operation of 1510 may be performed according to examples such as those disclosed herein. In some examples, the operation of 1510 may be performed by an SSB manager 930 as described with reference to Figure 9.

[0157]

[0166] In 1515, the method may include transmitting a random access preamble in a random access channel opportunity selected from a subset of a set of random access channel opportunities associated with one or more synchronization signal blocks, the random access channel opportunity being selected from a subset of the set of random access channel opportunities on the basis that the duration between the last received downlink transmission and the random access channel opportunity satisfies a threshold duration. The operation of 1515 may be performed according to examples such as those disclosed herein. In some examples, the operation of 1515 may be performed by a random access preamble manager 935 described with reference to Figure 9.

[0158]

[0167] Figure 16 shows a flowchart illustrating method 1600 supporting RO selection for RedCap UE according to aspects of this disclosure. The operation of method 1600 may be performed by a base station or its components as described herein. For example, the operation of method 1600 may be performed by base station 105 as described with reference to Figures 1-6 and 11-14. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described. In addition or alternatively, the base station may perform aspects of the functions described using dedicated hardware.

[0159]

[0168] In 1605, the method may include sending a message to a set of multiple UEs that includes a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of multiple UEs having a first capability, and a second mapping of a set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of multiple UEs having a second capability. The operation of 1605 may be performed according to examples such as those disclosed herein. In some examples, the operation of 1605 may be performed by an RO configuration manager 1325, as described with reference to Figure 13.

[0160]

[0169] In 1610, the method may include transmitting a set of synchronization signal blocks. The operation of 1610 may be performed according to examples such as those disclosed herein. In some examples, the operation of 1610 may be performed by an SSB manager 1330 as described with reference to Figure 13.

[0161]

[0170] In 1615, the method may include, in response to transmitting a set of synchronization signal blocks, receiving a random access preamble from one of a set of UEs in a random access channel opportunity selected from a first set of random access channel opportunities, according to a first mapping at least partially based on a UE having a first capability. The operation of 1615 may be performed according to examples such as those disclosed herein. In some examples, the operation of 1615 may be performed by a random access preamble manager 1335 described with reference to Figure 13.

[0162]

[0171] The following provides an overview of the aspects of this disclosure.

[0163]

[0172] Embodiment 1: A method for wireless communication in a UE, comprising receiving a message comprising: receiving a message comprising: a plurality of mappings of each set of synchronization signal blocks to each set of random access channel opportunities; receiving one or more synchronization signal blocks from the set of synchronization signal blocks, each set of synchronization signal blocks being identified from each set of synchronization signal blocks according to one of a plurality of mappings determined based on the capabilities of the UE, and the set of synchronization signal blocks being associated with a set of random access channel opportunities; and transmitting a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities, each random access channel opportunity being selected from a subset of the set of random access channel opportunities, each random access channel opportunity being selected at least in part on the duration between the last received downlink transmit and the random access channel opportunity satisfying a threshold duration.

[0164]

[0173] Embodiment 2: The method according to Embodiment 1, further comprising the UE receiving instructions for an uplink bandwidth portion for transmitting a random access preamble, based on the UE's capabilities.

[0165]

[0174] Embodiment 3: The method of any one embodiment 1 to 2, further comprising identifying a subset of the set of random access channel opportunities for selecting a random access channel opportunity from there, at least in part on the fact that the duration between the last received synchronization signal block of one or more synchronization signal blocks and each random access channel opportunity in a subset of the set of random access channel opportunities satisfies a threshold duration.

[0166]

[0175] Embodiment 4: The method of Embodiment 3, wherein identifying a subset of the set of random access channel opportunities for selecting a random access channel opportunity therefrom is further at least in part based on excluding random access channel opportunities from the set of random access channel opportunities that precede a synchronization signal block in the slot.

[0167]

[0176] Embodiment 5: The method according to any one of Embodiments 3 to 4, wherein the UE is configured to operate in half-duplex mode based at least in part on the capabilities of the UE, and the last received downlink transmit includes a control channel transmit, a data channel transmit, or a reference signal transmit.

[0168]

[0177] Embodiment 6: The method according to any one of embodiments 1 to 5, wherein receiving a message includes receiving in the message an instruction for selecting a subset of random access channel opportunities from which to be random access channel opportunities, at least in part on the duration between the last received synchronization signal block of one or more synchronization signal blocks and each random access channel opportunity in the subset of the set of random access channel opportunities satisfying a threshold duration.

[0169]

[0178] Embodiment 7: The method according to any one of Embodiments 1 to 6, wherein the threshold duration satisfies the minimum time required for the UE to transition from receive mode to transmit mode.

[0170]

[0179] Embodiment 8: The UE is configured to utilize frequency division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode is based at least in part on the numerology used for the random access preamble, the capabilities of the UE, or both, in the manner of Embodiment 7.

[0171]

[0180] Embodiment 9: The method according to any one of Embodiments 7 to 8, wherein the UE is configured to utilize time-division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode is at least in part based on the numerology used for the random access preamble, the capabilities of the UE, the radio frequency switching time in the UE, or a combination thereof.

[0172]

[0181] Embodiment 10: The method according to any one of Embodiments 1 to 9, wherein the threshold duration is equal to the duration configured in the UE to switch from the receive mode to the transmit mode in time-division duplex mode.

[0173]

[0182] Embodiment 11: The method according to any one of embodiments 1 to 10, further comprising receiving a threshold duration instruction from a base station, at least in part on the capabilities of the UE, wherein a random access channel opportunity is selected at least in part on receiving a threshold duration instruction.

[0174]

[0183] Embodiment 12: The method according to any one of Embodiments 1 to 11, wherein the message includes a system information message or a wireless resource control message.

[0175]

[0184] Embodiment 13: The method according to any one of Embodiments 1 to 12, wherein the capability of the UE includes a reduced capability.

[0176]

[0185] Embodiment 14: The set of synchronization signal blocks is indicated by ssb-PositionsInBurst in System Information Block 1 or ServingCellConfigCommon, as described in any of Embodiments 1 to 12.

[0177]

[0186] Embodiment 15: A method for wireless communication in an access network entity, comprising: transmitting a message to a plurality of UEs including a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of a plurality of UEs having a first capability, and a second mapping of a set of synchronization signal blocks to a second set of random access channel opportunities; transmitting a set of synchronization signal blocks for a second subset of a plurality of UEs having a second capability; and receiving a random access preamble from one of the plurality of UEs in a random access channel opportunity selected from the first set of random access channel opportunities according to a first mapping at least partially based on a UE having a first capability.

[0178]

[0187] Embodiment 16: The method of Embodiment 15, further comprising the UE transmitting instructions for an uplink bandwidth portion for transmitting a random access preamble, at least in part on the first capability of the UE.

[0179]

[0188] Embodiment 17: The method of Embodiment 15, further comprising the UE identifying a first set of random access channel opportunities for selecting a random access channel opportunity from there, at least in part on the fact that the duration between the last transmitted synchronization signal block in a set of synchronization signal blocks and each random access channel opportunity in a first set of random access channel opportunities satisfies a threshold duration.

[0180]

[0189] Embodiment 18: The method according to Embodiment 17, wherein the threshold duration satisfies the minimum time required for the UE to transition from receive mode to transmit mode.

[0181]

[0190] Embodiment 19: The method of Embodiment 18, wherein the UE is configured to utilize frequency division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode is based at least in part on the numerology used for the random access preamble, the capabilities of the UE, or both.

[0182]

[0191] Embodiment 20: The method of Embodiment 18, wherein the UE is configured to utilize time-division duplexing, and the minimum time for the UE to transition from receive mode to transmit mode is at least in part based on the numerology used for the random access preamble, the capabilities of the UE, the radio frequency switching time in the UE, or a combination thereof.

[0183]

[0192] Embodiment 21: The method of any one of Embodiments 17 to 20, wherein the UE identifies a first set of random access channel opportunities from which to select a random access channel opportunity, further based at least in part on excluding random access opportunities that precede synchronous signal blocks in a slot.

[0184]

[0193] Embodiment 22: The method according to any one of Embodiments 17 to 21, wherein the threshold duration is equal to the duration configured in the UE to switch from the receive mode to the transmit mode in time-division duplex mode.

[0185]

[0194] Embodiment 23: The method of any one of Embodiments 17 to 22, further comprising transmitting a threshold duration instruction to the UE based at least in part on the UE's capabilities, wherein receiving a random access preamble in a random access channel opportunity is at least in part on transmitting the threshold duration instruction.

[0186]

[0195] Embodiment 24: The method according to any one of Embodiments 15 to 23, wherein the message includes a system information message or a wireless resource control message.

[0187]

[0196] Embodiment 25: The method according to any one of Embodiments 15 to 24, wherein the first capability of the UE includes a reduced capability.

[0188]

[0197] Embodiment 26: A device for wireless communication in a UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform any of Embodiments 1 to 14.

[0189]

[0198] Embodiment 27: Apparatus for wireless communication in a UE, comprising at least one means for performing any of the methods of Embodiments 1 to 14.

[0190]

[0199] Embodiment 28: A non-temporary computer-readable medium for storing code for wireless communication in a UE, wherein the code includes instructions that can be executed by a processor to perform any of the methods of Embodiments 1 to 14.

[0191]

[0200] Embodiment 29: A device for wireless communication at a base station, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory that can be executed by the processor to cause the device to perform any of the methods of Embodiments 15 to 25.

[0192]

[0201] Embodiment 30: An apparatus for wireless communication at a base station, comprising at least one means for performing any of the methods of Embodiments 15 to 25.

[0193]

[0202] Embodiment 31: A non-temporary computer-readable medium for storing code for wireless communication at a base station, wherein the code includes instructions that can be executed by a processor to perform any of the methods of Embodiments 15 to 25.

[0194]

[0203] It should be noted that the methods described herein describe possible implementations, that the operations and steps may be reconfigured or otherwise modified, and that other implementations are possible. Furthermore, two or more embodiments of these methods may be combined.

[0195]

[0204] While embodiments of LTE, LTE-A, LTE-A Pro, or NR systems may be described as examples, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used extensively in the description, the techniques described herein are applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR. For example, the techniques described may be applicable to various other wireless communication systems such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and wireless technologies not expressly described herein.

[0196]

[0205] The information and signals described herein may be represented using a wide variety of technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0197]

[0206] The various exemplary blocks and components described in this disclosure may be implemented or run using general-purpose processors, DSPs, ASICs, CPUs, FPGAs or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller, or state machine. The processor may be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working with a DSP core, or any other such configuration).

[0198]

[0207] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the accompanying claims. For example, due to the nature of the software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented in different physical locations.

[0199]

[0208] Computer-readable media include both non-temporary computer storage media and communication media, including any media that facilitates the transfer of computer programs from one location to another. Non-temporary storage media may be any available media that can be accessed by a general-purpose computer or a dedicated computer. Examples, but not limited to, non-temporary computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM®), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-temporary media that can be used to transport or store desired program code means in the form of instructions or data structures, and can be accessed by a general-purpose or dedicated computer or a general-purpose or dedicated processor. Any connection is also appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable media. As used herein, disk and disc include CD, LaserDisc®, optical disc, Digital Multipurpose Disc (DVD), FloppyDisc®, and Blu-ray® disc, where disk typically reproduces data magnetically, and disc optically reproduces data using a laser. Any combination of the above is also included in the scope of computer-readable media.

[0200]

[0209] When used herein, including within the claims, “or” as used in an enumeration of items (e.g., an enumeration of items followed by a phrase such as “at least one of” or “one or more of”) indicates an inclusive enumeration, such as the enumeration “at least one of A, B, or C” meaning A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, the phrase “based on” as used herein should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as “based on condition A” may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, when used herein, the phrase “based on” shall be interpreted in the same way as the phrase “at least partially based on.”

[0201]

[0210] The term "decide" or "to decide" encompasses a wide variety of actions, and therefore "deciding" can include calculating, calculating, processing, deriving, investigating, looking up (e.g., through a lookup in a table, database, or other data structure), confirming, etc. It can also include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), resolving, selecting, choosing, establishing, and other similar actions.

[0202]

[0211] In the attached diagrams, similar components or features may have the same reference label. Furthermore, various components of the same type may be distinguished by adding a dash and a second label to distinguish similar components after the reference label. When only the first reference label is used herein, the description is applicable to any similar component having the same first reference label, regardless of the second reference label or any other subsequent reference labels.

[0203]

[0212] The descriptions provided herein with respect to the accompanying drawings are illustrative and do not necessarily represent all examples that may be implemented or that fall within the scope of the claims. The term “example” as used herein means “to serve as an example, case, or illustration,” and does not mean “preferred” or “advantageous over other examples.” Detailed descriptions include specific details to facilitate understanding of the described techniques. However, these techniques may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0204]

[0213] The descriptions herein are provided to enable those skilled in the art to create or use this disclosure. Various modifications of this disclosure will become apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of this disclosure. Accordingly, this disclosure should be given the broadest scope that is consistent with the principles and novel features disclosed herein, and is not limited to the examples and designs described herein. The invention described in the original claims of this application is listed below. [C1] A device for wireless communication in user equipment (UE), Processor and The memory coupled to the aforementioned processor, The instruction includes the instruction stored in the memory, and the instruction is given to the device. Receiving a message that includes multiple mappings of each set of synchronization signal blocks to each set of random access channel opportunities, Receiving one or more synchronous signal blocks from a set of synchronous signal blocks, the set of synchronous signal blocks being identified from each set of synchronous signal blocks according to one of the plurality of mappings determined at least in part on the capabilities of the UE, and the set of synchronous signal blocks being associated with a set of random access channel opportunities. To transmit a random access preamble in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronization signal blocks, and the random access channel opportunity is selected from the subset of the set of random access channel opportunities, at least in part on the duration between the last received downlink transmission and the random access channel opportunity satisfying a threshold duration. A device capable of performing the above-mentioned process by the processor. [C2] The aforementioned instruction is given to the device, The apparatus according to C1, further operable by the processor to cause the UE to receive instructions for an uplink bandwidth portion for transmitting the random access preamble, at least in part based on the capabilities of the UE. [C3] The aforementioned instruction is given to the device, The apparatus according to C1, wherein the processor can further cause the subset of the set of random access channel opportunities to be identified for selecting the random access channel opportunity from there, at least partially based on the fact that the duration between the last received synchronization signal block among the one or more synchronization signal blocks and each random access channel opportunity in the subset of the set of random access channel opportunities satisfies the threshold duration. [C4] The apparatus according to C3, wherein identifying a subset of the set of random access channel opportunities for selecting the random access channel opportunity therefrom is further, at least in part, based on excluding random access channel opportunities from the set of random access channel opportunities that precede a synchronous signal block in the slot. [C5] The UE is configured to operate in half-duplex mode, at least in part, based on the capabilities of the UE. The last received downlink transmission comprises a control channel transmission, a data channel transmission, or a reference signal transmission. The apparatus described in C1. [C6] The command for receiving the aforementioned message is given to the device, The apparatus according to C1, wherein the processor is capable of causing the message to receive an instruction for selecting the subset of the set of random access channel opportunities from which the random access channel opportunity is selected, at least partially based on the duration between the last received synchronization signal block of the one or more synchronization signal blocks and each random access channel opportunity in the subset of the set of random access channel opportunities satisfying the threshold duration. [C7] The apparatus according to C1, wherein the threshold duration satisfies the minimum time required for the UE to transition from receiving mode to transmitting mode. [C8] The apparatus according to C7, wherein the UE is configured to utilize frequency division duplexing, and the minimum time for the UE to transition from the receiving mode to the transmitting mode is at least partially based on the numerology used for the random access preamble, the capabilities of the UE, or both. [C9] The apparatus according to C7, wherein the UE is configured to utilize time-division duplexing, and the minimum time for the UE to transition from the receiving mode to the transmitting mode is at least in part based on the numerology used for the random access preamble, the capabilities of the UE, the radio frequency switching time in the UE, or a combination thereof. [C10] The apparatus according to C1, wherein the threshold duration is equal to the duration configured in the UE for switching from the receiving mode to the transmitting mode in time-division duplex mode. [C11] The command to the device, The apparatus according to C1, wherein the processor is further capable of causing the UE to receive the threshold duration instruction, and the random access channel opportunity is selected at least partially based on receiving the threshold duration instruction. [C12] The device according to C1, wherein the message comprises a system information message or a wireless resource control message. [C13] The apparatus according to C1, wherein the capacity of the UE is reduced. [C14] The set of synchronization signal blocks is indicated by ssb-PositionsInBurst in System Information Block 1 or ServingCellConfigCommon, as described in C1. [C15] A device for wireless communication in an access network entity, Processor and The memory coupled to the aforementioned processor, The instruction stored in the memory, and the instruction, in the device, The system causes multiple user devices (UEs) to send a message comprising: a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of the multiple UEs having a first capability; and a second mapping of the set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of the multiple UEs having a second capability. The set of the aforementioned synchronization signal blocks is transmitted, A device that, in response to the transmission of the set of synchronization signal blocks, can be operated by the processor to cause one of the plurality of UEs to receive a random access preamble in a random access channel opportunity selected from the first set of random access channel opportunities, according to the first mapping which is at least partially based on the UE having the first capability. [C16] The command to the device, The apparatus according to C15, further operable by the processor to cause the UE to transmit an instruction for an uplink bandwidth portion for transmitting the random access preamble, at least in part based on the first capability of the UE. [C17] The command to the device, The apparatus according to C15, wherein the processor can further cause the UE to identify the first set of random access channel opportunities from which to select the random access channel opportunity, at least in part on the fact that the duration between the last transmitted synchronization signal block in the set of synchronization signal blocks and each random access channel opportunity in the first set of random access channel opportunities satisfies a threshold duration. [C18] The apparatus according to C17, wherein the threshold duration satisfies the minimum time required for the UE to transition from receiving mode to transmitting mode. [C19] The apparatus according to C18, wherein the UE is configured to utilize frequency division duplexing, and the minimum time for the UE to transition from the receiving mode to the transmitting mode is at least partially based on the numerology used for the random access preamble, the capabilities of the UE, or both. [C20] The apparatus according to C18, wherein the UE is configured to utilize time-division duplexing, and the minimum time for the UE to transition from the receiving mode to the transmitting mode is at least in part based on the numerology used for the random access preamble, the capabilities of the UE, the radio frequency switching time in the UE, or a combination thereof. [C21] The apparatus according to C17, wherein the UE identifies the first set of random access channel opportunities from which to select the random access channel opportunity, further based at least in part on excluding random access opportunities that precede synchronous signal blocks in a slot. [C22] The apparatus according to C17, wherein the threshold duration is equal to the duration configured in the UE for switching from the receive mode to the transmit mode in time-division duplex mode. [C23] The command to the device, The apparatus according to C17, wherein the processor is further capable of causing the UE to transmit the threshold duration instruction based at least in part on the UE's capabilities, and receiving the random access preamble in the random access channel opportunity is at least in part on transmitting the threshold duration instruction. [C24] The device according to C15, wherein the message comprises a system information message or a wireless resource control message. [C25] The apparatus according to C15, wherein the first capability of the UE is a reduced capability. [C26] A method for wireless communication in user equipment (UE), Receiving a message that includes multiple mappings of each set of synchronization signal blocks to each set of random access channel opportunities, Receiving one or more synchronous signal blocks from a set of synchronous signal blocks, the set of synchronous signal blocks being identified from each set of synchronous signal blocks according to one of the plurality of mappings determined at least in part on the capabilities of the UE, and the set of synchronous signal blocks being associated with a set of random access channel opportunities. A random access preamble is transmitted in a random access channel opportunity selected from a subset of the set of random access channel opportunities associated with one or more synchronization signal blocks, and the random access channel opportunity is selected from the subset of the set of random access channel opportunities, at least in part on the duration between the last received downlink transmission and the random access channel opportunity satisfying a threshold duration. A method that includes [a certain feature]. [C27] The method of C26, further comprising the UE receiving instructions for an uplink bandwidth portion for transmitting the random access preamble, at least in part based on the UE's capabilities. [C28] The method of C26, further comprising identifying the subset of the set of random access channel opportunities for selecting the random access channel opportunity from there, at least in part on the fact that the duration between the last received synchronization signal block among the one or more synchronization signal blocks and each random access channel opportunity in the subset of the set of random access channel opportunities satisfies the threshold duration. [C29] The method of C28, wherein identifying a subset of the set of random access channel opportunities for selecting the random access channel opportunity therefrom is further, at least in part, based on excluding random access opportunities from the set of random access channel opportunities that precede a synchronous signal block in the slot. [C30] A method for wireless communication in an access network entity, Sending a message to multiple user devices (UEs) comprising: a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities for a first subset of the multiple UEs having a first capability; and a second mapping of the set of synchronization signal blocks to a second set of random access channel opportunities for a second subset of the multiple UEs having a second capability; To transmit the aforementioned set of synchronization signal blocks, In response to transmitting the set of synchronization signal blocks, a random access preamble is received from one of the plurality of UEs in a random access channel opportunity selected from the first set of random access channel opportunities, according to the first mapping which is at least partially based on the UE having the first capability. A method that includes [a certain feature].

Claims

1. A method for wireless communication in user equipment (UE), The system information includes receiving multiple mappings of sets of synchronization signal blocks to different sets of random access channel opportunities, Based at least in part on the capabilities of the UE, to identify one mapping of the set of synchronization signal blocks to the different sets of random access channel opportunities from the plurality of mappings, Receiving one or more synchronization signal blocks from the aforementioned set of synchronization signal blocks, In the receiving mode of the UE, the receiving of a downlink transmission, wherein the downlink transmission is one of the following: a control channel transmission, a data channel transmission, a channel status information reference signal, a tracking reference signal, or a positioning reference signal. In the transmission mode of the UE, the random access preamble is transmitted in a random access channel opportunity selected from a subset of the different sets of random access channel opportunities to which the one or more synchronization signal blocks are mapped, Equipped with, The random access channel opportunity is selected from the subset of the different sets of random access channel opportunities, at least in part on the basis that the duration between the reception of the downlink transmission and the random access channel opportunity satisfies a threshold duration related to the time it takes for the UE to transition from the receiving mode to the transmitting mode. The downlink transmission is the last downlink transmission received before the random access channel opportunity. The time it takes for the UE to transition from the receiving mode to the transmitting mode is at least in part based on the fact that the UE is configured to operate in half-duplex mode. The threshold duration satisfies the minimum time required for the UE to transition from the receiving mode to the transmitting mode. method.

2. The method according to claim 1, further comprising identifying the subset of different sets of random access channel opportunities for selecting the random access channel opportunities, at least in part on the fact that a second duration between the last received synchronization signal block of the one or more synchronization signal blocks and each random access channel opportunity in the subset of the different sets of random access channel opportunities satisfies the threshold duration.

3. The method of claim 2, wherein identifying the subset of the different sets of random access channel opportunities for selecting the random access channel opportunity is further at least in part based on excluding random access opportunities of the different sets of random access channel opportunities that precede a synchronous signal block in a slot.

4. Receiving the system information means The method according to claim 1, further comprising receiving in the system information an instruction for selecting the subset of the different sets of random access channel opportunities for at least partially on the basis that a second duration between the last received synchronization signal block of the one or more synchronization signal blocks and each random access channel opportunity in the subset of the different sets of random access channel opportunities satisfies the threshold duration.

5. The UE is configured to utilize time-division duplexing, The method according to claim 1, wherein the minimum time for the UE to transition from the receiving mode to the transmitting mode is at least in part based on the numerology used for the random access preamble, the capabilities of the UE, the radio frequency switching time in the UE, or a combination thereof.

6. The method according to claim 1, further comprising receiving instructions for the threshold duration, at least in part on the capability of the UE, wherein the random access channel opportunity is selected at least in part on receiving instructions for the threshold duration.

7. The method according to claim 1, wherein the capacity of the UE is a reduced capacity.

8. An apparatus for wireless communication comprising means configured to carry out the method described in any one of claims 1 to 7.

9. A method for wireless communication in an access network entity, Transmitting system information to multiple user devices (UEs), wherein the system information comprises a plurality of mappings including a first mapping of a set of synchronization signal blocks to a first set of random access channel opportunities, and a second mapping of the set of synchronization signal blocks to a second set of random access channel opportunities, wherein the first mapping and the second mapping are at least partially based on the capabilities of each of the plurality of UEs. Transmitting the aforementioned set of synchronization signal blocks, A downlink transmission is transmitted to one of the aforementioned multiple UEs, wherein the downlink transmission is one of the following: a control channel transmission, a data channel transmission, a channel status information reference signal, a tracking reference signal, or a positioning reference signal. In response to transmitting the set of synchronization signal blocks, the UE receives a random access preamble in a random access channel opportunity selected from the first set of random access channel opportunities, according to the first mapping and at least partially based on the fact that the duration between the transmission of the downlink transmission and the random access channel opportunity satisfies a threshold duration related to the time it takes for the UE to transition from receive mode to transmit mode. Equipped with, The downlink transmission is the last downlink transmission received by the UE before the random access channel opportunity. The first set of random access channel opportunities is identified at least in part on the basis that the second duration between the last transmitted synchronization signal block in the set of synchronization signal blocks and each random access channel opportunity in the first set of random access channel opportunities satisfies the threshold duration. The time it takes for the UE to transition from the receiving mode to the transmitting mode is at least in part based on the fact that the UE is configured to operate in half-duplex mode. The threshold duration satisfies the minimum time required for the UE to transition from receiving mode to transmitting mode. method.

10. An apparatus for wireless communication comprising means configured to carry out the method described in claim 9.

11. A computer program comprising program instructions, wherein the program instructions perform all steps of the method according to any one of claims 1 to 7 when the program is executed by a computer.

12. A computer program comprising program instructions, wherein the program instructions perform all the steps of the method according to claim 9 when the program is executed by a computer.

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