Modulation and coding schemes for high-frequency band wireless communications

Abstract

Methods, systems, and apparatus for wireless communications are described in which a user equipment (UE) can transmit a random access message (e.g., msgA or msg3) using a modulation and coding scheme (MCS) selected based on a frequency band and subcarrier spacing for a random access procedure. The MCS may depend on the size of the frequency band and the SCS satisfying a threshold. In some cases, a base station may select and indicate an MCS for the UE. Additionally or alternatively, a phase tracking reference signal may be transmitted along with the random access message to correct for phase noise.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. patent application No. 17 / 326,291, entitled “MODULATION AND CODING SCHEMES FOR HIGH BAND WIRELESS COMMUNICATIONS,” filed by ZEWAIL et al. on May 20, 2021, and U.S. provisional patent application No. 63 / 029,538, entitled “MODULATION AND CODING SCHEMES FOR HIGH BAND WIRELESS COMMUNICATIONS,” filed by ZEWAIL et al. on May 24, 2020; each of which is assigned to the assignee of this application, and each of which is expressly incorporated herein by reference.

[0003] introduction

[0004] The following relates generally to wireless communications, and more particularly to techniques for managing a modulation and coding scheme (MCS) in wireless communications.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. 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, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may use various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform extended orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting the communication of multiple communication devices, which may be referred to as user equipment (UE) in addition.

[0006] Overview

[0007] A method for wireless communication at a UE is described. The method may include receiving from a base station an indication of an MCS for a random access message of a random access procedure based on a frequency band for the random access procedure and a subcarrier spacing (SCS) associated with the frequency band. The method may further include transmitting the random access message to the base station via a random access channel (RACH) of the frequency band according to the SCS and the MCS.

[0008] An apparatus for wireless communication at a UE is described. The apparatus may include: a processor; and a memory coupled to the processor, the processor and the memory being configured to: receive from a base station an indication of an MCS for a random access message of a random access procedure based on a frequency band for a random access procedure and an SCS associated with the frequency band. The processor and the memory may be further configured to: transmit a random access message to the base station via a RACH of the frequency band according to the SCS and the MCS.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include means for receiving, from a base station, an indication of an MCS for a random access message for a random access procedure based on a frequency band for a random access procedure and an SCS associated with the frequency band. The apparatus may further include means for transmitting a random access message to the base station via a RACH of the frequency band based on the SCS and the MCS.

[0010] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to perform the following operations: receiving from a base station an indication of an MCS for a random access message of a random access procedure based on a frequency band for a random access procedure and an SCS associated with the frequency band. The code may further include instructions executable by the processor to transmit a random access message to the base station via a RACH of the frequency band according to the SCS and the MCS.

[0011] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: selecting an MCS table from a set of MCS tables based on the frequency band and the SCS associated with the frequency band, wherein the MCS for the random access message may be selected from the MCS table.

[0012] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the MCS table includes a set of MCSs having a lower modulation order relative to all other MCS tables in the set of MCS tables.

[0013] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving an uplink grant including a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit independent of conveying the indication of the MCS.

[0014] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the at least one reserved bit may be associated with a demodulation reference signal (DMRS) multiplexing for a random access message.

[0015] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the at least one reserved bit may correspond to a transport block size scaling value for a random access message.

[0016] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the MCS satisfies a threshold MCS that may be based on the frequency band and an SCS associated with the frequency band.

[0017] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the threshold MCS includes one of quadrature phase shift keying (QPSK) modulation or 16 quadrature amplitude modulation (QAM).

[0018] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting to a base station an indication of a UE preference for a reference signal configuration for phase tracking based on the MCS.

[0019] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: transmitting one or more phase tracking reference signals according to the reference signal configuration, wherein the one or more phase tracking reference signals may be transmitted together with a random access message.

[0020] Some examples of methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for selecting an MCS based on the reference signal configuration.

[0021] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting a random access preamble during a random access opportunity based on a UE preference for a reference signal configuration.

[0022] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for receiving an association between a random access preamble set, a random access timing set, and a reference signal configuration set, and selecting a random access preamble and a random access timing based on a second reference signal configuration in the reference signal configuration set corresponding to the reference signal configuration and the association.

[0023] A method for wireless communication at a base station is described. The method may include transmitting an indication of an MCS for a random access message for a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The method may further include receiving a random access message based on the MCS from a UE.

[0024] An apparatus for wireless communication at a base station is described. The apparatus may include: a processor; and a memory coupled to the processor, the processor and the memory being configured to: transmit an indication of an MCS for a random access message of a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The processor and the memory may be further configured to: receive a random access message based on the MCS from a UE.

[0025] Another apparatus for wireless communication at a base station is described. The apparatus may include means for transmitting an indication of an MCS for a random access message for a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The apparatus may further include means for receiving a random access message based on the MCS from a UE.

[0026] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: transmit an indication of an MCS for a random access message for a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The code may further include instructions executable by the processor to: receive a random access message based on the MCS from a UE.

[0027] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving a random access message via the RACH of the frequency band according to the SCS and the MCS in response to an indication of the MCS.

[0028] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for transmitting an uplink grant including a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit that is independent of conveying the indication of the MCS.

[0029] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the at least one reserved bit may be associated with DMRS multiplexing for a random access message.

[0030] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the at least one reserved bit may correspond to a transport block size scaling value for a random access message.

[0031] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the MCS satisfies a threshold MCS that may be based on the frequency band and an SCS associated with the frequency band.

[0032] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the threshold MCS includes one of QPSK modulation or 16QAM.

[0033] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: transmitting an association between a random access preamble set, a random access opportunity set, and a reference signal configuration set to a UE; receiving a random access message from the UE via a random access opportunity based on the association according to the random access preamble; and selecting a reference signal configuration from the reference signal configuration set based on the random access preamble and the random access opportunity.

[0034] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: receiving an indication of a UE preference for a reference signal configuration for phase tracking based on the MCS; and selecting the reference signal configuration from a reference signal configuration set for a phase tracking reference signal for the UE based on the UE preference.

[0035] A method for wireless communication at a UE is described. The method may include determining a frequency band that can be used for a random access procedure between the UE and a base station and determining an SCS associated with the frequency band. The method may further include: selecting an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band; and transmitting the random access message to the base station via a RACH of the frequency band according to the SCS and the selected MCS.

[0036] An apparatus for wireless communication at a UE is described. The apparatus may include a processor; and a memory coupled to the processor, the processor and the memory being configured to: determine a frequency band that can be used for a random access procedure between the UE and a base station; and determine an SCS associated with the frequency band. The processor and the memory may be further configured to: select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band; and transmit a random access message to the base station via a RACH of the frequency band according to the SCS and the selected MCS.

[0037] Another apparatus for wireless communication at a UE is described. The apparatus may include: means for determining a frequency band that can be used for a random access procedure between the UE and a base station and means for determining an SCS associated with the frequency band. The apparatus may further include: means for selecting an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band; and means for transmitting a random access message to a base station via a RACH of the frequency band according to the SCS and the selected MCS.

[0038] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor for the following operations: determining a frequency band that can be used for a random access procedure between the UE and a base station and determining an SCS associated with the frequency band. The code may further include instructions executable by the processor for the following operations: selecting an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band; and transmitting a random access message to the base station via a RACH of the frequency band according to the SCS and the selected MCS.

[0039] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving an indication of an MCS to be selected from an MCS set from a base station, wherein the MCS is selected based on the indication.

[0040] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving an uplink grant including a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit independent of conveying the indication of the MCS.

[0041] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the at least one reserved bit is associated with DMRS multiplexing for a random access message.

[0042] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the at least one reserved bit corresponds to a transport block size scaling value for a random access message.

[0043] Some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for determining a threshold MCS based on the frequency band and the SCS associated with the frequency band, wherein the selected MCS satisfies the threshold MCS.

[0044] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the threshold MCS includes one of QPSK modulation or 16QAM.

[0045] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: determining a UE preference for a reference signal configuration for phase tracking based on a selected MCS; and transmitting an indication of the UE preference to a base station.

[0046] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: transmitting one or more phase tracking reference signals according to the reference signal configuration, wherein the one or more phase tracking reference signals are transmitted together with the random access message.

[0047] Some examples of methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for selecting an MCS based on the reference signal configuration.

[0048] Some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining a random access preamble and a random access opportunity based on a UE preference for a reference signal configuration.

[0049] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for determining an association between a random access preamble set, a random access timing set, and a reference signal configuration set, and selecting a random access preamble and a random access timing based on a second reference signal configuration in the reference signal configuration set corresponding to the reference signal configuration.

[0050] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: selecting an MCS table from a set of MCS tables based on the frequency band and the SCS associated with the frequency band, wherein the MCS for the random access message is selected from the MCS table.

[0051] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the MCS table includes a set of MCSs having a lower modulation order relative to all other MCS tables in the set of MCS tables.

[0052] A method of wireless communication at a base station is described. The method may include determining a frequency band that can be used for a random access procedure between the base station and a UE and determining an SCS associated with the frequency band. The method may further include: selecting an MCS for a random access message of the random access procedure from a set of MCSs based on the frequency band and the SCS associated with the frequency band; and transmitting an indication of the selected MCS for the random access message to the UE.

[0053] An apparatus for wireless communication at a base station is described. The apparatus may include a processor; and a memory coupled to the processor, the processor and the memory being configured to: determine a frequency band that may be used for a random access procedure between a base station and a UE; and determine an SCS associated with the frequency band. The processor and the memory may be further configured to: select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band; and transmit an indication of the selected MCS for the random access message to the UE.

[0054] Another apparatus for wireless communication at a base station is described. The apparatus may include means for determining a frequency band that may be used for a random access procedure between the base station and a UE and means for determining an SCS associated with the frequency band. The apparatus may further include: means for selecting an MCS for a random access message of the random access procedure from a set of MCSs based on the frequency band and the SCS associated with the frequency band; and means for transmitting an indication of the selected MCS for the random access message to the UE.

[0055] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor for the following operations: determining a frequency band that can be used for a random access procedure between a base station and a UE and determining an SCS associated with the frequency band. The code may further include instructions executable by the processor for the following operations: selecting an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band; and transmitting an indication of the selected MCS for the random access message to the UE.

[0056] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving a random access message from a UE via a RACH of the frequency band based on the SCS and the selected MCS in response to an indication of the selected MCS.

[0057] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for transmitting an uplink grant including a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit that is independent of conveying the indication of the MCS.

[0058] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the at least one reserved bit is associated with DMRS multiplexing for a random access message.

[0059] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the at least one reserved bit corresponds to a transport block size scaling value for a random access message.

[0060] Some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for determining a threshold MCS based on the frequency band and the SCS associated with the frequency band, wherein the selected MCS satisfies the threshold MCS.

[0061] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the threshold MCS includes one of QPSK modulation or 16QAM.

[0062] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: transmitting an association between a random access preamble set, a random access opportunity set, and a reference signal configuration set to a UE; receiving a random access message from the UE via a random access opportunity based on the association according to the random access preamble; and determining a reference signal configuration in the reference signal configuration set based on the random access preamble and the random access opportunity.

[0063] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: receiving an indication of a UE preference for a reference signal configuration for phase tracking based on the MCS; and determining the reference signal configuration for a phase tracking reference signal for the UE based on the UE preference. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 An example of a wireless communication system supporting MCS for high-band wireless communications according to aspects of the present disclosure is illustrated.

[0066] Figure 2 An example of a wireless communication system supporting MCS for high-band wireless communications according to aspects of the present disclosure is illustrated.

[0067] Figure 3 An example of a process flow for supporting MCS for high-band wireless communications in accordance with one or more aspects of the present disclosure is illustrated.

[0068] Figure 4 An example of a process flow for supporting MCS for high-band wireless communications in accordance with one or more aspects of the present disclosure is illustrated.

[0069] Figure 5 and 6 A block diagram of a device supporting MCS for high-band wireless communications according to one or more aspects of the present disclosure is shown.

[0070] Figure 7 A block diagram of a communication manager supporting MCS for high-band wireless communications in accordance with one or more aspects of the present disclosure is shown.

[0071] Figure 8 A diagram of a system including a device supporting MCS for high-band wireless communications according to one or more aspects of the present disclosure is shown.

[0072] Fig. 9 and 10 A block diagram of a device supporting MCS for high-band wireless communications according to one or more aspects of the present disclosure is shown.

[0073] Fig.11 A block diagram of a communication manager supporting MCS for high-band wireless communications in accordance with one or more aspects of the present disclosure is shown.

[0074] Fig.12 A diagram of a system including a device supporting MCS for high-band wireless communications according to one or more aspects of the present disclosure is shown.

[0075] Figures 13 to 23 A flow chart illustrating a method of supporting MCS for high-band wireless communications according to one or more aspects of the present disclosure is shown.

[0076] Detailed Description

[0077] In some wireless communication systems, a UE may operate using a frequency band and an SCS, where the SCS may be the distance between subcarriers in the frequency domain. A base station may indicate to the UE the frequency band and the SCS to be used for operation. The base station may also indicate to the UE an MCS, where the number of bits carried by each resource element may depend on the MCS. Accordingly, the base station and the UE may communicate on the frequency band using the SCS and the MCS.

[0078] Wireless communication systems supporting millimeter wave (mmW) communications may suffer performance degradation due to phase noise when operating with high frequencies and relatively small SCSs. In some cases, phase tracking reference signals may not be supported to correct the phase noise of random access messages, and therefore, small SCSs at high frequencies may reduce reliability. In another example, higher-order MCSs are more sensitive to the effects of phase noise. This sensitivity is amplified when operating with high frequencies and small SCSs. Therefore, UEs operating with high frequencies, small SCSs, and higher-order MCSs may suffer reduced reliability, which may result in transmission loss.

[0079] In order to reduce the impact of phase noise and increase the reliability of transmission, the UE and the base station can communicate using an MCS based on the frequency band and the SCS utilized at the frequency band where they are transmitting. For example, the UE can determine the frequency band that can be used for the random access procedure between the UE and the base station and the SCS associated with the frequency band. Based on the frequency band and SCS, the UE can select the MCS of the random access message for the random access procedure from the MCS set. After selecting the MCS, the UE can transmit the random access message to the base station via the RACH of the frequency band using the associated SCS and the selected MCS. In some cases, the base station can determine the frequency band and the associated SCS that can be used for the random access procedure. Here, the base station can select the MCS from the MCS set based on the frequency band and SCS, and transmit an indication of the selected MCS for the random access message to the UE. In response to the indication, the UE can select the corresponding MCS and transmit the random access message according to the frequency band, SCS and the selected MCS. In some cases, the base station or UE can select the MCS based on the frequency band and SCS satisfying various thresholds for the frequency band and SCS.

[0080] In other cases, the UE may transmit a random access message based on a reference signal configuration determined based on the selected MCS. For a connected UE in a contention-free RACH procedure, the base station may configure the UE with several reference signal configurations, each of which is associated with an MCS. The selected MCS may include an order of the MCS, and the UE may select the reference signal configuration based on comparing the order of the selected MCS with the orders of the MCSs associated with the reference signal configurations. The UE may then transmit a random access message based on the selected MCS and the reference signal configuration.

[0081] Some of the techniques described herein may not be limited to UEs in a connected state and in a contention-free RACH, and may support additional or other operating scenarios, such as UEs in an idle or inactive state or in a contention-based RACH, etc. In such a situation, for example, a base station may transmit an association between a random access preamble set, a random access opportunity set, and a reference signal configuration set to a UE. Here, the UE may determine the recommended reference signal configuration and the corresponding random access preamble and random access opportunity from the reference signal configuration set. The UE may transmit a random access message via a corresponding random access opportunity based on the selected MCS, the recommended reference signal configuration, and the corresponding random access preamble. The base station may then determine the reference signal configuration of the random access message based on receiving the random access preamble via the random access opportunity.

[0082] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Various aspects of the present disclosure are subsequently described in the context of a process flow. Various aspects of the present disclosure are further illustrated and described by and with reference to device diagrams, system diagrams, and flow charts associated with an MCS for high-band wireless communications.

[0083] Figure 1 An example of a wireless communication system 100 supporting MCS for high-band wireless communication according to various aspects of the present disclosure is illustrated. 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 an LTE network, an LTE-A network, an LTE-A Pro network, or an NR network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0084] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be different forms of devices or devices with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0085] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be different forms of devices or devices with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), such as Figure 1 as shown in .

[0086] Each base station 105 may communicate with the core network 130, or communicate with each other, or both. For example, the base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3 or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105), or indirectly (e.g., via the core network 130), or directly and indirectly on the backhaul link 120 (e.g., via X2, Xn or other interfaces). In some examples, the backhaul link 120 may be or include one or more wireless links. The UE 115 may communicate with the core network 130 via a communication link 155.

[0087] One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a B node, an evolved B node (eNB), a next generation B node or a gigabit B node (any of which may be referred to as a gNB), a home B node, a home evolved B node, or other suitable terminology.

[0088] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or 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 communication (MTC) device, etc., which may be implemented in various objects such as electrical appliances or vehicles, meters, etc.

[0089] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 as shown in .

[0090] The UE 115 and the 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 the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates 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 acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0091] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. A carrier may operate in a standalone mode in which initial acquisition and connection may be made by UE 115 via the carrier, or a carrier may operate in a non-standalone mode in which a connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0092] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in an FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in a TDD mode).

[0093] A carrier may be associated with a particular bandwidth of a radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several determined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier of a particular radio access technology. Devices (e.g., base stations 105, UEs 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communications on a particular carrier bandwidth, or may be configurable to support communications on 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 communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., subband, BWP) or all of a carrier bandwidth.

[0094] The signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or DFT-S-OFDM). In a system using MCM technology, a resource element may include a code element period (e.g., the duration of a modulation code element) and a subcarrier, where the code element period and SCS are inversely related. The number of bits carried by each resource element may depend on the MCS (e.g., the order of the MCS, the code rate of the MCS, or both). Thus, the more resource elements UE115 receives and the higher the order of the MCS, the higher the data rate of UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further improve the data rate or data integrity of communication with UE 115.

[0095] One or more parameter sets for a carrier may be supported, where the parameter set may include an SCS and a cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter designs. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for a UE 115 may be limited to the one or more active BWPs.

[0096] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, and the basic time unit can be, for example, a sampling period T s =1 / (Δf max ·Nf) seconds, where Δf maxNf may represent the maximum supported SCS, and Nf may represent the maximum supported discrete Fourier transform (DFT) size. Time intervals 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).

[0097] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have 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 a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the SCS. Each time slot may include a number of code element periods (e.g., depending on the length of the cyclic prefix added before each code element period). In some wireless communication systems 100, the time slot may be further divided into a plurality of mini-time slots containing one or more code elements. Excluding the cyclic prefix, each code element period may include one or more (e.g., Nf) sampling periods. The duration of the code element period may depend on the SCS or the operating band.

[0098] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0099] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0100] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with a base station 105 (e.g., on a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) used to distinguish adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The range of such a cell may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area depending on various factors (such as the capabilities of the base station 105). For example, a cell may be or include a building, a subset of a building, or an external space between or overlapping a geographic coverage area 110, as well as other examples.

[0101] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access to UEs 115 that have service subscriptions with a network provider that supports the macro cell. A small cell may be associated with a lower power base station 105 (compared to a macro cell), and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to UEs 115 that have service subscriptions with a network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a home or office). A base station 105 may support one or more cells and may also support communications on one or more cells using one or more component carriers.

[0102] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0103] In some examples, base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the 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, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0104] The wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication, 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 prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, critical mission, and ultra-reliable low latency may be used interchangeably herein.

[0105] In some examples, UE 115 may also be able to communicate directly with other UE 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some examples, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between each UE 115 without involving the base station 105.

[0106] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these communications. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in the V2X system can communicate with roadside infrastructure (such as roadside units), or with the network, or both via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communications.

[0107] 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 5G core (5GC), and the EPC or 5GC may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a base station 105 associated with the core network 130. User IP packets may be delivered via a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0108] Some network devices (such as base stations 105) may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). Each access network transport 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 merged into a single network device (e.g., base station 105).

[0109] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). In general, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from about 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate various structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0110] The electromagnetic spectrum is typically subdivided into various classes, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz–7.125 GHz) and FR2 (24.25 GHz–52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the "sub-6 GHz band" in various documents and articles. Similar naming issues sometimes arise with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in various documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0111] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands of these mid-band frequencies as frequency range designation FR3 (7.125GHz–24.25GHz). The frequency bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and thus the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. Additionally, higher frequency bands are currently being explored to extend 5G NR operations to above 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6GHz–71GHz), FR4 (52.6GHz–114.25GHz), and FR5 (114.25GHz–300GHz). Each of these higher frequency bands falls within the EHF band.

[0112] In view of the above aspects, unless otherwise specifically stated, it should be understood that if used in this article, the term "sub-6 GHz" and the like can broadly represent frequencies that can be less than 6 GHz, can be within FR1, or can include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if used in this article, the term "millimeter wave" and the like can broadly represent frequencies that can include mid-band frequencies, can be within FR2, or can be within the EHF band.

[0113] The wireless communication system 100 may also operate in a super high frequency (SHF) zone using a frequency band from 3 GHz to 30 GHz (also known as a centimeter band) or in an EHF zone of a spectrum (e.g., from 30 GHz to 300 GHz) (also known as a millimeter band). In some examples, the wireless communication system 100 may support mmW communications between a UE 115 and a base station 105, and the EHF antennas of the corresponding devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be employed across transmissions using one or more different frequency zones, and the use of frequency bands specified across these frequency zones may differ by country or regulatory agency.

[0114] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) may employ carrier sensing for conflict detection and avoidance. In some examples, operations in an unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in a licensed band. Operations in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0115] The base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having antenna ports of several rows and columns that the base station 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0116] The base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such technology may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, the receiving device may receive multiple signals via different antennas or different antenna combinations. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0117] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0118] In some examples, transmission by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may transmit a reference signal that may be precoded or unprecoded (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)). The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0119] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a base station 105. For example, the receiving device may try multiple reception directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different reception configurations or reception directions. In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). The single reception configuration may be aligned on a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0120] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate on a logical channel. The media access control (MAC) layer may perform priority handling and multiplex logical channels into transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmission of the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection that supports radio bearers of user plane data between UE 115 and base station 105 or core network 130. In the physical layer, transport channels may be mapped to physical channels.

[0121] UE 115 and base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received on communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve the throughput of the MAC layer in poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support simultaneous slot HARQ feedback, wherein the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0122] The UE 115 and the base station 105 can communicate based on the frequency band, SCS, and MCS. In some cases, the UE 115 can use a random access procedure to establish or re-establish a connection with the base station 105 or identify parameters and configurations for communicating with the base station 105. For example, a UE 115 in a connected mode (e.g., an RRC connected mode) in a contention-free RACH can determine a frequency band and SCS that can be used for a random access procedure between the UE 115 and the base station 105. Based on the frequency band and the SCS, the UE 115 can select an MCS for a random access message of a random access procedure from an MCS set. After selecting the MCS, the UE 115 can transmit a random access message to the base station 105 via the RACH of the frequency band using the associated SCS and the selected MCS. In some cases, the base station 105 can determine a frequency band and an associated SCS that can be used for a random access procedure. Here, the base station 105 may select an MCS from the MCS set based on the frequency band and the SCS, and transmit an indication of the selected MCS for the random access message to the UE 115. In response to the indication, the UE 115 may select a corresponding MCS and transmit a random access message according to the frequency band, the SCS, and the selected MCS. In some cases, the base station 105 or the UE 115 may select the MCS based on the frequency band and the SCS satisfying various thresholds for the frequency band and the SCS.

[0123] Additionally or alternatively, UE 115 may transmit a random access message based on a reference signal configuration determined based on the selected MCS. Base station 105 may configure UE 115 to have a number of reference signal configurations, each reference signal configuration associated with an MCS. The selected MCS may include an order of the MCS, and UE 115 may select a reference signal configuration based on comparing the order of the selected MCS with the orders of the MCSs associated with the reference signal configurations. UE 115 may then transmit a random access message based on the selected MCS and the reference signal configuration.

[0124] Some of the techniques described herein may not be limited to UE 115 in a connected state and a non-contention RACH, and may support additional or other operating scenarios, such as UE 115 in an idle or inactive state or in a contention-based RACH, etc. In such a situation, the base station 105 may transmit an association between a random access preamble set, a random access opportunity set, and a reference signal configuration set to the UE 115. Here, the UE 115 may determine a preferred reference signal configuration and a corresponding random access preamble and random access opportunity from the reference signal configuration set. The UE 115 may transmit a random access message via a corresponding random access opportunity based on the selected MCS, the preferred reference signal configuration, and the corresponding random access preamble. The base station 105 may then determine the reference signal configuration of the random access message based on receiving the random access preamble via the random access opportunity.

[0125] The UE 115 may include a UE communication manager 101, which may be used to determine a frequency band and an SCS that may be used for a random access procedure between the UE 115 and the base station 105. The UE communication manager 101 may select an MCS for a random access message of the random access procedure based on the frequency band and the SCS that may be used for the random access procedure. The UE communication manager 101 may transmit a random access message to the base station 105 via a RACH of the frequency band according to the SCS and the selected MCS.

[0126] The base station 105 may include a base station communication manager 102 that may be used to determine a frequency band and an SCS that may be used for a random access procedure between the base station 105 and the UE 115. The base station communication manager 102 may select an MCS for a random access message of the random access procedure based on the frequency band and the SCS that may be used for the random access procedure. The base station communication manager 102 may transmit an indication of the selected MCS for the random access message to the UE 115.

[0127] Figure 2 An example of a wireless communication system 200 that supports MCS for high-band wireless communication according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 can include a base station 105-a and a UE 115-a, which can be as described with reference to Figure 1 Corresponding examples of UE 115 and base station 105 are described.

[0128] UE 115-a can support high-frequency band wireless communications. For example, UE 115-a can support communication with base station 105-a in high frequency bands (e.g., SHF, EHF). UE 115-a can also support the use of various SCSs (e.g., 30kHz, 60kHz, 120kHz, 960kHz) and MCSs to communicate with base station 105-a. As more spectrum is utilized, higher-order MCSs can be used for communication. For example, the radio access technology can utilize QPSK, 16-QAM, 64-QAM, 256-QAM, and 1024-QAM modulation orders. UE 115-a can communicate with base station 105-a via communication link 125. For example, UE 115-a and base station 105-a can transmit and receive random access messages of random access procedures via communication link 125. Communication link 125-a and communication link 125-b can be referenced. Figure 1 An example of a communication link 125 is described.

[0129] UE 115-a may use a random access procedure to establish or re-establish a connection with base station 105-a or identify appropriate parameters and configurations for communicating with base station 105-a. The wireless communication system 200 may support a four-step random access procedure and a two-step random access procedure. The four-step random access procedure may include four message exchanges between UE 115-a and base station 105-a, while the two-step random access procedure may include two message exchanges between UE 115-a and base station 105-a. In both procedures, it may be appropriate to enable UE 115-a to transmit data or control information to base station 105-a. In the four-step random access procedure, UE 115-a may transmit data or control information to base station 105-a in a third random access message (e.g., MSG3). In the two-step random access procedure, UE 115-a may transmit data or control information to base station 105-a in a first random access message (e.g., MSG1 or MSGA).

[0130] UE 115-a may determine that it wants to perform a random access procedure (e.g., a two-step random access procedure, a four-step random access procedure) with base station 105-a. In order to perform the random access procedure, base station 105-a may transmit RACH configuration information 205 to UE 115-a in system information or RRC signaling via communication link 125-a. Base station 105-a may determine the frequency band and SCS available for the random access procedure. Base station 105-a may select an MCS for a random access message 210 of the random access procedure from an MCS set. Base station 105-a may select an MCS based on available frequency bands and SCS. After selecting the MCS, base station 105-a may transmit an indication of the available frequency band, SCS, and the selected MCS for the random access message 210 in RACH configuration information 205.

[0131] In some cases, the base station 105-a may determine a threshold MCS based on the frequency band and the SCS, and select the MCS based on the MCS satisfying the threshold MCS. For example, the base station 105-a may determine that a 60 GHz frequency band with a 60 kHz SCS may be used for a random access procedure. Here, the base station 105-a may determine that an MCS with an order higher than the QPSK MCS at the 60 GHz frequency band with a 60 kHz SCS may be sensitive to phase noise. The base station 105-a may determine that the QPSK MCS is the threshold MCS and select the QPSK MCS for the random access message 210 of the random access procedure. In another example, the base station 105-a may determine that a 60 GHz frequency band with a 120 kHz SCS may be used for a random access procedure. Here, the base station 105-a may determine that an MCS with an order higher than the 16QAM MCS at the 60 GHz frequency band with a 120 kHz SCS may be sensitive to phase noise. The base station 105-a may determine that 16QAM MCS is a threshold MCS and select QPSK MCS or 16QAM MCS for the random access message 210 of the random access procedure. In another example, the base station 105-a may determine that the 90 GHz band with a 120 kHz SCS may be used for the random access procedure. Here, the base station 105-a may determine that an MCS with an order higher than the eighth MCS at the 90 GHz band with a 120 kHz SCS may be sensitive to phase noise. The base station 105-a may determine that the eighth MCS is a threshold MCS and select an MCS that meets the threshold MCS for the random access message 210 of the random access procedure.

[0132] UE 115-a may receive the indication in RACH configuration information 205 from base station 105-a and determine the frequency band and SCS available for the random access procedure. UE 115-a (which may be in connected mode and for a contention-free RACH scenario) may select an MCS for a random access message 210 for the random access procedure from a set of MCSs based on the available frequency band and SCS. In some cases, UE 115-a selects an MCS based on receiving an indication of the MCS selected by base station 105-a. In some examples, UE 115-a may select the MCS indicated by base station 105-a.

[0133] In some cases, the UE 115-a may determine a threshold MCS based on the frequency band and the SCS, and select the MCS based on the MCS satisfying the threshold MCS. For example, the UE 115-a may determine that a 60 GHz frequency band with a 60 kHz SCS may be used for a random access procedure. Here, the UE 115-a may determine that an MCS with an order higher than the QPSK MCS at the 60 GHz frequency band with a 60 kHz SCS may be sensitive to phase noise. The UE 115-a may determine that the QPSK MCS is the threshold MCS, and select the QPSK MCS for the random access message 210 of the random access procedure. In another example, the UE 115-a may determine that a 60 GHz frequency band with a 120 kHz SCS may be used for a random access procedure. Here, the UE 115-a may determine that an MCS with an order higher than the 16QAM MCS at the 60 GHz frequency band with a 120 kHz SCS may be sensitive to phase noise. UE 115-a may determine that 16QAM MCS is a threshold MCS and select QPSK MCS or 16QAM MCS for a random access message 210 of a random access procedure. In another example, UE 115-a may determine that a 90 GHz band with a 120 kHz SCS may be used for a random access procedure. Here, UE 115-a may determine that an MCS with an order higher than an eighth-order MCS at a 90 GHz band with a 120 kHz SCS may be sensitive to phase noise. UE 115-a may determine that an eighth-order MCS is a threshold MCS and select an MCS that satisfies the threshold MCS for a random access message 210 of a random access procedure.

[0134] The base station 105-a may transmit an uplink grant in the indication included in the RACH configuration information 205. The uplink grant may include a set of bits for the UE 115-a to convey an indication of the selected MCS, wherein the set of bits includes at least one reserved bit independent of the bit used to convey the indication. For example, four bits may be reserved for the UE 115-a to convey an indication of the selected MCS to the base station 105-a. If the base station 105-a selects a QPSK MCS or an eight-order MCS for the UE 115-a to use for the random access message 210, only three bits may be required to convey the indication of the selected MCS. The base station 105-a may transmit an uplink grant to the UE 115-a, wherein the uplink grant includes four bits-three bits for conveying the indication and one reserved bit for other purposes. In some cases, the reserved bit may facilitate DMRS multiplexing for the random access message 210. In other cases, the reserved bit corresponds to a transport block size scaling value for the random access message 210.

[0135] In some cases, the base station 105 may indicate the selected MCS via an MCS index corresponding to the MCS table. The MCS table may include information such as an MCS index, a modulation order, a target code rate, and a spectral efficiency (which may be determined based on the modulation order and the target code rate). The UE 115-a may select an MCS table from a set of MCS tables from which to select an MCS for the random access message 210. In some cases, the MCS table includes a set of MCSs, each MCS including an order of the MCS. In some instances, the MCS table may include a set of MCSs having a lower modulation order relative to the modulation orders of other MCS tables. In some examples, the UE 115-a may select an MCS table based on the frequency band and SCS indicated by the base station 105-a in the RACH configuration information 205. For example, if UE 115-a determines that a 60 GHz band with a 60 kHz SCS is available for random access procedures (e.g., as indicated by base station 105-a), UE 115-a may select an MCS table with a lower modulation order from a set of MCS tables relative to other MCS tables in the set. Here, UE 115-a may then select an MCS for random access message 210 from an MCS table with a lower modulation order. In some examples, if a 60 GHz band with a 120 kHz SCS is available for random access procedures, UE 115-a may select an MCS table with a higher modulation order. In some cases, if a 90 GHz band with a 120 kHz SCS is available for random access procedures, UE 115-a may select an MCS table with a lower modulation order. In some instances, if a 90 GHz band with a 960 kHz SCS is available for random access procedures, UE 115-a may select an MCS table with a higher modulation order.

[0136] UE 115-a may transmit a random access message 210 based on a reference signal configuration determined based on a selected MCS. Base station 105-a may configure UE 115 to have several reference signal configurations, each of which is associated with an MCS. Each reference signal configuration may be associated with a time density of a phase tracking reference signal with which it is transmitted. For example, if UE 115-a transmits a random access message 210 based on a reference signal configuration with a time density of four, UE 115-a transmits the random access message 210 together with a phase tracking reference signal every four symbols. The selected MCS may include an order of the MCS, and UE 115-a may select a reference signal configuration based on comparing the order of the selected MCS with the order of the MCS associated with these reference signal configurations. In some cases, UE 115-a may determine a preference for a reference signal configuration. In some cases, UE 115-a may select an MCS based on a preference for reference signal modulation. The UE 115-a may transmit a random access message 210 based on the selected MCS and the preferred reference signal configuration. Here, the UE 115-a transmits one or more phase tracking reference signals with the random access message 210 based on the time density associated with the selected reference signal configuration. In some cases, the UE 115-a transmits an indication of a preference for a reference signal configuration to the base station 105-a prior to transmitting the random access message 210.

[0137] Some of the techniques described herein may not be limited to UEs 115 in a connected state and in a contention-free RACH, and may support additional or other operating scenarios, such as UEs 115 in an idle or inactive state or in a contention-based RACH, etc. In such a scenario, the base station 105-a may transmit an association between a set of random access preambles, a set of random access opportunities, and a set of reference signal configurations to the UE 115-a. Here, the UE 115-a may determine a preference for a reference signal configuration from the reference signal configuration set. The preferred reference signal configuration may correspond to a random access preamble and a random access opportunity that indicate the preferred reference signal configuration to the base station 105-a. The UE 115-a may transmit a random access message 210 via a corresponding random access opportunity based on the selected MCS, the preferred reference signal configuration, and the corresponding random access preamble. The base station 105-a may then determine the reference signal configuration of the random access message 210 based on receiving the random access preamble via the random access opportunity.

[0138] Figure 3 An example of a process flow 300 for supporting MCS for high-band wireless communications according to one or more aspects of the present disclosure is illustrated. In some examples, the process flow 300 may be implemented as described with reference to Figure 1 and Figure 2Aspects of the process flow 300 may be implemented by a UE 115-b, which may be a wireless communication system as described above. Figure 1 and Figure 2 An example of a UE 115 is described. Aspects of process flow 300 may be implemented by a base station 105-b, which may be as described with reference to Figure 1 and Figure 2 An example of a base station 105 is described.

[0139] At 305, the base station 105-b may determine a frequency band and an SCS that may be used for a random access procedure between the base station 105-b and the UE 115-b. The random access procedure may be a two-step random access procedure or a four-step random access procedure.

[0140] At 310, the base station 105-b may select an MCS for a random access message for the random access procedure from a set of MCSs based on the available frequency band and the SCS. In some cases, the base station 105-b may determine a threshold MCS based on the frequency band and the SCS, and select the MCS based on the MCS satisfying the threshold MCS.

[0141] At 315, the base station 105-b may transmit RACH configuration information to the UE 115-b, the RACH configuration information including an indication of an available frequency band, an SCS, and a selected MCS for a random access message. In some cases, the RACH configuration information may include an MCS index corresponding to an MCS table. In some instances, the base station 105-b may transmit an uplink grant in the indication included in the RACH configuration information. The uplink grant may include a set of bits for the UE 115-b to convey an indication of the selected MCS, wherein the set of bits includes at least one reserved bit independent of the bits used to convey the indication.

[0142] At 320, the UE 115-b may optionally select an MCS table to be used in selecting an MCS for a random access message of a random access procedure. In some cases, the UE 115-b selects the MCS table based on an MCS index included in the RACH configuration information. In some cases, the UE 115-b may select an MCS table from a set of MCS tables that has a lower modulation order relative to other MCS tables in the set.

[0143] At 325, UE 115-b may select an MCS for a random access message based on the available frequency band and the SCS. In some cases, UE 115-b may determine a threshold MCS based on the frequency band and the SCS, and select the MCS based on the MCS satisfying the threshold MCS. In some examples, UE 115-b may select an MCS from a selected MCS table. Based on a random access procedure (e.g., a two-step random access procedure or a four-step random access procedure), process flow 300 may optionally follow a first procedure (referred to herein as procedure 1) or a second procedure (referred to herein as procedure 2). For example, if the random access procedure is a two-step random access procedure, process flow 300 may follow procedure 1. Additionally, if the random access procedure is a four-step random access procedure, process flow 300 may follow procedure 2.

[0144] For procedure 1, at 330, UE 115-b may transmit a random access message (e.g., MSGA) via the RACH of the frequency band based on the SCS and the selected MCS. In some examples, UE 115-b may transmit the random access message based on an uplink grant including a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit independent of the bits used to convey the indication. At 335, base station 105-b may transmit a contention resolution message (e.g., MSGB) indicating that the two-step random access procedure has been successful.

[0145] For procedure 2, at 340, UE 115-b may transmit a random access preamble to base station 105-b in a first random access message. At 345, base station 105-b may transmit a second random access message (e.g., a random access response) in response to the random access preamble. At 350, UE 115-b may transmit a third random access message (e.g., MSG3) to base station 105-b via the RACH of the frequency band according to the SCS and the selected MCS. At 355, base station 105-b may transmit an RRC contention resolution message to UE 115-b indicating that the four-step random access procedure has been successful.

[0146] Figure 4 An example of a process flow 400 for supporting MCS for high-band wireless communications according to one or more aspects of the present disclosure is illustrated. In some examples, the process flow 400 may be implemented as described with reference to Figure 1 and Figure 2 Aspects of the process flow 400 may be implemented by a UE 115-c, which may be a wireless communication system as described above. Figures 1 to 3 1. An example of a UE 115 is described. Aspects of process flow 400 may be implemented by a base station 105-c, which may be as described with reference to Figures 1 to 3 An example of a base station 105 is described.

[0147] At 405, the base station 105-c may determine a frequency band and an SCS that may be used for a random access procedure between the base station 105-c and the UE 115-c. The random access procedure may be a two-step random access procedure or a four-step random access procedure. The base station 105-c may also select an MCS for a random access message of the random access procedure based on the available frequency band and the SCS.

[0148] At 410, the base station 105-c may transmit RACH configuration information to the UE 115-c, the RACH configuration information including an indication of an available frequency band, an SCS, and a selected MCS for a random access message. In some examples, the base station 105-c may transmit an uplink grant in the indication included in the RACH configuration information. The uplink grant may include a set of bits for the UE 115-c to convey an indication of the selected MCS, wherein the set of bits includes at least one reserved bit independent of the bits used to convey the indication.

[0149] At 415, the base station 105-c may optionally transmit an association between the set of random access preambles, the set of random access opportunities, and the set of reference signal configurations to the UE 115-c. In some cases, the base station transmits the association in RACH configuration information at 410. The operation of 415 may not be limited to UEs in a connected state and contention-free RACH, and may support additional or other operating scenarios, such as UEs in an idle or inactive state or in contention-based RACH, etc.

[0150] At 420, the UE 115-c may select an MCS for the random access message based on the available frequency band and the SCS.

[0151] At 425, the UE 115-c may determine a preference for a reference signal configuration for a phase tracking reference signal. In some instances, the UE 115-c may determine the preference based on a selected MCS. In some cases, the selected MCS may include an order of the MCS, and the UE 115-c may determine the preferred reference signal configuration based on comparing the order of the selected MCS with an order of an MCS associated with a preferred reference signal configuration. In some examples, the preferred reference signal configuration may be associated with a temporal density of phase tracking reference signals transmitted therewith. In some cases, the UE 115-c may select an MCS at 420 based on a preference for reference signal modulation.

[0152] At 430, the UE 115-c may optionally transmit an indication of the UE preference to the base station 115-c. Based on the random access procedure (e.g., a two-step random access procedure or a four-step random access procedure), the process flow 400 may optionally follow a first procedure (referred to herein as procedure 1) or a second procedure (referred to herein as procedure 2). For example, if the random access procedure is a two-step random access procedure, the process flow 400 may follow procedure 1. Additionally, if the random access procedure is a four-step random access procedure, the process flow 400 may follow procedure 2.

[0153] For procedure 1, at 435, the UE 115-c may transmit a random access message (e.g., MSGA) via the RACH of the band according to the SCS, the selected MCS, and the reference signal configuration. At 440, the base station 105-c may transmit a contention resolution message (e.g., MSGB) indicating that the two-step random access procedure has been successful.

[0154] For procedure 2, at 445, the UE 115-c may transmit a random access preamble to the base station 105-c in a first random access message. At 450, the base station 105-c may transmit a second random access message (e.g., a random access response) in response to the random access preamble. At 455, the UE 115-c may transmit a third random access message (e.g., MSG3, RRC connection request) to the base station 105-c via the RACH of the frequency band according to the SCS, the selected MCS, and the reference signal configuration. At 460, the base station 105-c may transmit an RRC contention resolution message to the UE 115-c indicating that the four-step random access procedure has been successful.

[0155] Figure 5 A block diagram 500 of a device 505 supporting MCS for high-band wireless communications according to aspects of the present disclosure is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a UE communication manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0156] The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to MCS for high-band wireless communications, etc.). The information may be passed to other components of the device 505. The receiver 510 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The receiver 510 may utilize a single antenna or a collection of antennas.

[0157] The UE communication manager 515 may determine a frequency band that may be used for a random access procedure between the UE and the base station, determine an SCS associated with the frequency band, select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band, and transmit a random access message to the base station via a RACH of the frequency band according to the SCS and the selected MCS. The UE communication manager 515 may be an example of aspects of the UE communication manager 810 described herein.

[0158] Additionally or alternatively, the UE communication manager 515 may receive from the base station an indication of an MCS for a random access message of the random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band, and transmit the random access message to the base station via a RACH of the frequency band according to the SCS and the MCS. The UE communication manager 515 may be an example of various aspects of the UE communication manager 810 described herein.

[0159] The UE communication manager 515 may be an example of a device for performing various aspects of managing a smart repeater as described herein. The UE communication manager 515 or its subcomponents may be implemented in hardware (e.g., in a communication management circuit system). The circuit system 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, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0160] In another implementation, the UE communication manager 515 or its subcomponents may be implemented in code executed by a processor (e.g., as communication management software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the UE communication manager 515 or its subcomponents may be performed by a general purpose processor, DSP, ASIC, FPGA, or other programmable logic device.

[0161] In some examples, UE communications manager 515 may be configured to perform various operations (e.g., receive, determine, select, transmit) using or otherwise coordinating with receiver 510, transmitter 520, or both.

[0162] The UE communication manager 515 or its subcomponents may be physically located in various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the UE communication manager 515 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the UE communication manager 515 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0163] The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may be co-located with the receiver 510 in a transceiver module. For example, the transmitter 520 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0164] In some examples, the UE communications manager 515 may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 510 and transmitter 520 may be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to the mobile device modem to enable wireless transmission and reception on one or more frequency bands.

[0165] The UE communication manager 515 described herein may be implemented to enable the device 405 to transmit messages for a RACH procedure using an MCS selected based on the frequency band and the SCS, which may increase reliability when operating at higher frequencies and smaller SCSs. Some implementations of the UE communication manager 515 may enable the device 405 to configure a phase tracking reference signal for one or more phase tracking reference signals included with a random access message transmission. Such techniques may reduce or correct phase noise as part of a RACH procedure, thereby enabling the device 405 to support more efficient communications and successful RACH procedures.

[0166] Figure 6 A block diagram 600 of a device 605 supporting MCS for high-band wireless communications according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of the device 505 or UE 115 as described herein. The device 605 may include a receiver 610, a UE communication manager 615, and a transmitter 640. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0167] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to MCS for high-band wireless communications, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The receiver 610 may utilize a single antenna or a collection of antennas.

[0168] The UE communication manager 615 may be an example of aspects of the UE communication manager 515 as described herein. The UE communication manager 615 may include a band manager 620, an SCS manager 625, an MCS manager 630, and a communication component 635. The UE communication manager 615 may be an example of aspects of the UE communication manager 810 described herein.

[0169] The frequency band manager 620 may determine a frequency band that may be used for a random access procedure between a UE and a base station.

[0170] The SCS manager 625 may determine the SCS associated with the frequency band.

[0171] The MCS manager 630 may select an MCS for a random access message of the random access procedure from the MCS set based on the frequency band and the SCS associated with the frequency band.

[0172] The communication component 635 can transmit a random access message to the base station via the RACH of the frequency band according to the SCS and the selected MCS.

[0173] Additionally or alternatively, the MCS manager 630 may receive from the base station an indication of an MCS for a random access message of the random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The communication component 635 may transmit a random access message to the base station via the RACH of the frequency band based on the SCS and the MCS.

[0174] The transmitter 640 may transmit signals generated by other components of the device 605. In some examples, the transmitter 640 may be co-located with the receiver 610 in a transceiver module. For example, the transmitter 640 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The transmitter 640 may utilize a single antenna or a collection of antennas.

[0175] Figure 7A block diagram 700 of a UE communication manager 705 supporting MCS for high-band wireless communications according to aspects of the present disclosure is shown. The UE communication manager 705 may be an example of aspects of the UE communication manager 515, the UE communication manager 615, or the UE communication manager 810 described herein. The UE communication manager 705 may include a band manager 710, an SCS manager 715, an MCS manager 720, a communication component 725, an uplink grant component 730, a threshold component 735, a UE preference manager 740, a phase tracking reference signal component 745, an association component 750, and a random access manager 755. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0176] The frequency band manager 710 may determine a frequency band that may be used for a random access procedure between a UE and a base station.

[0177] The SCS manager 715 may determine the SCS associated with the frequency band.

[0178] The MCS manager 720 may select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band. In some examples, the MCS manager 720 may receive an indication of an MCS to be selected from an MCS set from a base station, wherein the MCS is selected based on the indication. In some examples, the MCS manager 720 may select an MCS based on a reference signal configuration. In some examples, the MCS manager 720 may select an MCS table from an MCS table set based on the frequency band and the SCS associated with the frequency band, wherein the MCS for the random access message is selected from the MCS table. In some cases, the MCS table includes an MCS set having a lower modulation order relative to all other MCS tables in the MCS table set.

[0179] The communication component 725 can transmit a random access message to the base station via the RACH of the frequency band according to the SCS and the selected MCS. In some examples, the communication component 725 can transmit an indication of the UE preference to the base station.

[0180] The uplink grant component 730 may receive an uplink grant including a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit independent of conveying the indication of the MCS. In some cases, the at least one reserved bit is associated with DMRS multiplexing for a random access message. In some cases, the at least one reserved bit corresponds to a transport block size scaling value for the random access message.

[0181] The threshold component 735 can determine a threshold MCS based on the frequency band and the SCS associated with the frequency band, wherein the selected MCS satisfies the threshold MCS. In some cases, the threshold MCS includes one of QPSK modulation or 16QAM.

[0182] The UE preference manager 740 may determine a UE preference for a reference signal configuration for phase tracking based on the selected MCS. In some examples, the UE preference manager 740 may determine a random access preamble and a random access opportunity based on the UE preference for a reference signal configuration.

[0183] The phase tracking reference signal component 745 can transmit one or more phase tracking reference signals according to the reference signal configuration, wherein the one or more phase tracking reference signals are transmitted with the random access message.

[0184] Associating component 750 can determine an association between a set of random access preambles, a set of random access opportunities, and a set of reference signal configurations.

[0185] The random access manager 755 may select a random access preamble and a random access opportunity based on a second reference signal configuration in the reference signal configuration set corresponding to the reference signal configuration.

[0186] Additionally or alternatively, the MCS manager 720 may be configured to or otherwise support means for receiving from a base station an indication of an MCS for a random access message of a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The communication component 725 may be configured to or otherwise support means for transmitting a random access message to the base station via a RACH of the frequency band based on the SCS and the MCS.

[0187] In some examples, the MCS manager 720 may be configured or otherwise support means for selecting an MCS table from a set of MCS tables based on the frequency band and the SCS associated with the frequency band, wherein the MCS for the random access message is selected from the MCS table.

[0188] In some examples, the MCS table includes a set of MCSs having a lower modulation order relative to all other MCS tables in the set of MCS tables.

[0189] In some examples, uplink grant component 730 may be configured as or otherwise support an apparatus for receiving an uplink grant that includes a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit that is independent of conveying the indication of the MCS.

[0190] In some examples, the at least one reserved bit is associated with DMRS multiplexing for a random access message.

[0191] In some examples, the at least one reserved bit corresponds to a transport block size scaling value for the random access message.

[0192] In some examples, the MCS satisfies a threshold MCS based on the frequency band and an SCS associated with the frequency band.

[0193] In some examples, the threshold MCS includes one of QPSK modulation or 16QAM.

[0194] In some examples, UE preference manager 740 may be configured or otherwise supported for transmitting to a base station an indication of a UE preference for a reference signal configuration for phase tracking based on the MCS.

[0195] In some examples, the phase tracking reference signal component 745 may be configured as or otherwise support a device for transmitting one or more phase tracking reference signals according to the reference signal configuration, wherein the one or more phase tracking reference signals are transmitted in conjunction with the random access message.

[0196] In some examples, MCS manager 720 may be configured or otherwise support means for selecting an MCS based on the reference signal configuration.

[0197] In some examples, the random access manager 755 may be configured or otherwise support means for transmitting a random access preamble during a random access opportunity based on a UE preference for a reference signal configuration.

[0198] In some examples, the associating component 750 may be configured as or otherwise support means for receiving an association between a set of random access preambles, a set of random access opportunities, and a set of reference signal configurations. In some examples, the random access manager 755 may be configured as or otherwise support means for selecting a random access preamble and a random access opportunity based on a second reference signal configuration in the set of reference signal configurations corresponding to the reference signal configuration and the association.

[0199] Figure 8A diagram of a system 800 including a device 805 supporting an MCS for high-band wireless communications according to aspects of the present disclosure is shown. The device 805 may be an example of a device 505, a device 605, or a UE 115 as described herein or a component including the above-mentioned devices. The device 805 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a UE communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., a bus 845).

[0200] The UE communication manager 810 can determine a frequency band that can be used for a random access procedure between the UE and the base station, determine an SCS associated with the frequency band, select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band, and transmit a random access message to the base station via the RACH of the frequency band based on the SCS and the selected MCS.

[0201] Additionally or alternatively, the UE communication manager 810 may receive from a base station an indication of an MCS for a random access message for a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band, and transmit the random access message to the base station via a RACH of the frequency band based on the SCS and the MCS.

[0202] By including or configuring a UE communications manager 810 according to examples as described herein, the device 805 can support techniques for advantages such as increased reliability, data rates, spectral efficiency, resource usage, coordination between devices, battery life and processing power, and reduced latency and power consumption.

[0203] I / O controller 815 can manage input and output signals of device 805. I / O controller 815 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 815 can utilize an operating system, such as MS- MS- OS / Or another known operating system. In other cases, I / O controller 815 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 815 may be implemented as part of a processor. In some cases, a user may interact with device 805 via I / O controller 815 or via hardware components controlled by I / O controller 815.

[0204] The transceiver 820 may communicate bidirectionally via one or more antennas, wired or wireless links, as described herein. For example, the transceiver 820 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 820 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0205] In some cases, a wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0206] The memory 830 may include random access memory (RAM) and read-only memory (ROM). The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 830 may include, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0207] The processor 840 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate the memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) so that the device 805 performs various functions (e.g., various functions or tasks of supporting an MCS for high-band wireless communications).

[0208] The code 835 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 835 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 835 may not be directly executed by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0209] Fig. 9A block diagram 900 of a device 905 supporting MCS for high-band wireless communications according to aspects of the present disclosure is shown. The device 905 may be an example of aspects of a base station 105 as described herein. The device 905 may include a receiver 910, a base station communication manager 915, and a transmitter 920. The device 905 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0210] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to MCS for high-band wireless communications). The information may be passed to other components of the device 905. The receiver 910 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The receiver 910 may utilize a single antenna or a collection of antennas.

[0211] The base station communication manager 915 may determine a frequency band that may be used for a random access procedure between the base station and the UE, determine an SCS associated with the frequency band, select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band, and transmit an indication of the selected MCS for the random access message to the UE. The base station communication manager 915 may be an example of aspects of the base station communication manager 1210 described herein.

[0212] Additionally or alternatively, the base station communication manager 915 may transmit an indication of an MCS for a random access message for a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band, and receive a random access message based on the MCS from the UE. The base station communication manager 915 may be an example of various aspects of the base station communication manager 1210 described herein.

[0213] The base station communication manager 915 may be an example of a means for performing various aspects of managing a smart repeater as described herein. The base station communication manager 915 or its subcomponents may be implemented in hardware (e.g., in a communication management circuit system). The circuit system may include a processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0214] In another implementation, the base station communication manager 915 or its subcomponents may be implemented in code executed by a processor (e.g., as communication management software or firmware), or any combination thereof. If implemented in code executed by a processor, the functionality of the base station communication manager 915 or its subcomponents may be performed by a general purpose processor, DSP, ASIC, FPGA, or other programmable logic device.

[0215] In some examples, base station communications manager 915 may be configured to perform various operations (eg, receive, determine, select, transmit) using or otherwise coordinating with receiver 910, transmitter 920, or both.

[0216] The base station communication manager 915 or its subcomponents may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the base station communication manager 915 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the base station communication manager 915 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, I / O components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0217] By including or configuring a base station communication manager 915 according to the examples described herein, the device 905 (e.g., a processor controlling or otherwise coupled to the receiver 910, the base station communication manager 915, the transmitter 920, or a combination thereof) can support techniques for reduced processing, reduced power consumption, and more efficient utilization of communication resources by supporting frequency band and SCS based RACH procedures.

[0218] The transmitter 920 may transmit signals generated by other components of the device 905. In some examples, the transmitter 920 may be co-located with the receiver 910 in a transceiver module. For example, the transmitter 920 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The transmitter 920 may utilize a single antenna or a collection of antennas.

[0219] Fig.10 A block diagram 1000 of a device 1005 supporting MCS for high-band wireless communications according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or base station 105 as described herein. The device 1005 may include a receiver 1010, a base station communication manager 1015, and a transmitter 1040. The device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0220] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to MCS for high-band wireless communications). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0221] The base station communication manager 1015 may be an example of aspects of the base station communication manager 915 as described herein. The base station communication manager 1015 may include a band manager 1020, an SCS manager 1025, an MCS manager 1030, and a communication component 1035. The base station communication manager 1015 may be an example of aspects of the base station communication manager 1210 described herein.

[0222] The frequency band manager 1020 may determine a frequency band that may be used for a random access procedure between a base station and a UE.

[0223] The SCS manager 1025 may determine the SCS associated with the frequency band.

[0224] The MCS manager 1030 may select an MCS for a random access message of the random access procedure from the MCS set based on the frequency band and the SCS associated with the frequency band.

[0225] Communication component 1035 can transmit an indication of the selected MCS for the random access message to the UE.

[0226] Additionally or alternatively, the MCS manager 1030 can transmit an indication of an MCS for a random access message of a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The communication component 1035 can receive a random access message based on the MCS from the UE.

[0227] Transmitter 1040 can transmit signals generated by other components of device 1005. In some examples, transmitter 1040 can be co-located with receiver 1010 in a transceiver module. For example, transmitter 1040 can be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The transmitter 1040 may utilize a single antenna or a collection of antennas.

[0228] Fig.11A block diagram 1100 of a base station communication manager 1105 supporting MCS for high-band wireless communications according to aspects of the present disclosure is shown. The base station communication manager 1105 can be an example of aspects of the base station communication manager 1015, the base station communication manager 1015, or the base station communication manager 1210 described herein. The base station communication manager 1105 may include a band manager 1110, an SCS manager 1115, an MCS manager 1120, a communication component 1125, an uplink grant component 1130, a threshold component 1135, a random access manager 1140, and a reference signal configuration component 1145. Each of these modules can communicate directly or indirectly with each other (e.g., via one or more buses).

[0229] The frequency band manager 1110 may determine a frequency band that may be used for a random access procedure between a base station and a UE.

[0230] The SCS manager 1115 may determine the SCS associated with the frequency band.

[0231] The MCS manager 1120 may select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and an SCS associated with the frequency band.

[0232] The communication component 1125 may transmit an indication of the selected MCS for the random access message to the UE. In some examples, the communication component 1125 may receive a random access message from the UE via a RACH of the frequency band according to the SCS and the selected MCS in response to the indication of the selected MCS. In some examples, the communication component 1125 may receive a random access message from the UE via a random access opportunity based on the association according to the random access preamble.

[0233] The uplink grant component 1130 may transmit an uplink grant including a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit independent of conveying the indication of the MCS. In some cases, the at least one reserved bit is associated with DMRS multiplexing for a random access message. In some cases, the at least one reserved bit corresponds to a transport block size scaling value for the random access message.

[0234] The threshold component 1135 can determine a threshold MCS based on the frequency band and the SCS associated with the frequency band, wherein the selected MCS satisfies the threshold MCS. In some cases, the threshold MCS includes one of QPSK modulation or 16QAM.

[0235] The random access manager 1140 may transmit an association between a random access preamble set, a random access opportunity set, and a reference signal configuration set to the UE.

[0236] The reference signal configuration component 1145 may determine a reference signal configuration in the reference signal configuration set based on the random access preamble and the random access opportunity. In some examples, the reference signal configuration component 1145 may receive an indication of a UE preference for a reference signal configuration for phase tracking based on the selected MCS. In some examples, the reference signal configuration component 1145 may determine the reference signal configuration for a phase tracking reference signal for the UE based on the UE preference.

[0237] Additionally or alternatively, the MCS manager 1120 may be configured or otherwise support means for transmitting an indication of an MCS for a random access message for a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The communication component 1125 may be configured or otherwise support means for receiving a random access message based on the MCS from the UE.

[0238] In some examples, communication component 1125 may be configured or otherwise support means for receiving a random access message via a RACH for the frequency band in accordance with the SCS and the MCS in response to an indication of the MCS.

[0239] In some examples, uplink grant component 1130 may be configured as or otherwise support a device for transmitting an uplink grant that includes a set of bits for conveying an indication of the MCS, wherein the set of bits includes at least one reserved bit that is independent of conveying the indication of the MCS.

[0240] In some examples, the at least one reserved bit is associated with DMRS multiplexing for a random access message.

[0241] In some examples, the at least one reserved bit corresponds to a transport block size scaling value for the random access message.

[0242] In some examples, the MCS satisfies a threshold MCS based on the frequency band and an SCS associated with the frequency band.

[0243] In some examples, the threshold MCS includes one of QPSK modulation or 16QAM.

[0244] In some examples, the random access manager 1140 may be configured as or otherwise support means for transmitting to the UE an association between a set of random access preambles, a set of random access opportunities, and a set of reference signal configurations. In some examples, the communication component 1125 may be configured as or otherwise support means for receiving a random access message from the UE via a random access opportunity based on the association according to the random access preamble. In some examples, the reference signal configuration component 1145 may be configured as or otherwise support means for selecting a reference signal configuration from the reference signal configuration set based on the random access preamble and the random access opportunity.

[0245] In some examples, reference signal configuration component 1145 can be configured as or otherwise support means for receiving an indication of a UE preference for a reference signal configuration for phase tracking based on the MCS. In some examples, reference signal configuration component 1145 can be configured as or otherwise support means for selecting the reference signal configuration from a set of reference signal configurations for a phase tracking reference signal for the UE based on the UE preference.

[0246] Fig.12 A diagram of a system 1200 including a device 1205 supporting MCS for high-band wireless communications according to aspects of the present disclosure is shown. The device 1205 may be an example of or include components of a device 905, a device 1005, or a base station 105 as described herein. The device 1205 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a base station communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication via one or more buses (e.g., a bus 1250).

[0247] The base station communication manager 1210 can determine a frequency band that can be used for a random access procedure between the base station and the UE, determine an SCS associated with the frequency band, select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band, and transmit an indication of the selected MCS for the random access message to the UE.

[0248] The base station communication manager 1210 may transmit an indication of an MCS for a random access message of a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band, and receive a random access message based on the MCS from a UE.

[0249] By including or configuring the base station communications manager 1210 according to the examples described herein, the device 1205 can support techniques for advantages such as increased reliability, data rates, spectral efficiency, resource usage, coordination between devices, battery life and processing power, and reduced latency and power consumption.

[0250] The network communications manager 1215 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1215 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0251] The transceiver 1220 may communicate bidirectionally via one or more antennas, wired or wireless links, as described herein. For example, the transceiver 1220 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1220 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0252] In some cases, a wireless device may include a single antenna 1225. However, in some cases, the device may have more than one antenna 1225, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0253] Memory 1230 may include RAM, ROM, or a combination thereof. Memory 1230 may store computer readable code 1235 including instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform various functions described herein. In some cases, memory 1230 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0254] Processor 1240 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) so that device 1205 performs various functions (e.g., functions or tasks of supporting an MCS for high-band wireless communications).

[0255] The inter-site communication manager 1245 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1245 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-site communication manager 1245 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0256] The code 1235 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1235 may not be directly executed by the processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0257] Fig.13 1 is a flow chart illustrating a method 1300 for supporting MCS for high-band wireless communications according to aspects of the present disclosure. The operations of the method 1300 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1300 may be implemented by referring to Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0258] At 1305, the UE may determine a frequency band that may be used for a random access procedure between the UE and the base station. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed as described in reference to Figures 5 to 8 The described band manager is implemented.

[0259] At 1310, the UE may determine an SCS associated with the frequency band. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed as described with reference to Figures 5 to 8 Described in the SCS Manager to perform.

[0260] At 1315, the UE may select an MCS for a random access message of the random access procedure from the MCS set based on the frequency band and the SCS associated with the frequency band. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed as described with reference to Figures 5 to 8 The MCS manager described here is used to perform the

[0261] At 1320, the UE may transmit a random access message to the base station via the RACH of the frequency band according to the SCS and the selected MCS. The operation of 1320 may be performed according to the method described herein. In some examples, various aspects of the operation of 1320 may be performed as described with reference to Figures 5 to 8 The described communication components are used to perform.

[0262] Fig.14 1 is a flow chart illustrating a method 1400 for supporting MCS for high-band wireless communications according to aspects of the present disclosure. The operations of the method 1400 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1400 may be implemented by referring to Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0263] At 1405, the UE may determine a frequency band that may be used for a random access procedure between the UE and the base station. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Figures 5 to 8 The described band manager is implemented.

[0264] At 1410, the UE may determine an SCS associated with the frequency band. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described with reference to Figures 5 to 8 Described in the SCS Manager to perform.

[0265] At 1415, the UE may determine a threshold MCS based on the frequency band and the SCS associated with the frequency band. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed as described with reference to Figures 5 to 8 The threshold component described is implemented.

[0266] At 1420, the UE may select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band, wherein the selected MCS satisfies a threshold MCS. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be performed as described with reference to Figures 5 to 8 The MCS manager described here is used to perform the

[0267] At 1425, the UE may transmit a random access message to the base station via the RACH of the frequency band according to the SCS and the selected MCS. The operation of 1425 may be performed according to the method described herein. In some examples, various aspects of the operation of 1425 may be performed as described with reference to Figures 5 to 8 The described communication components are used to perform.

[0268] Fig.15 1 is a flow chart illustrating a method 1500 for supporting MCS for high-band wireless communications according to aspects of the present disclosure. The operations of the method 1500 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1500 may be implemented by referring to Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0269] At 1505, the UE may determine a frequency band that may be used for a random access procedure between the UE and the base station. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described in reference to Figures 5 to 8 The described band manager is implemented.

[0270] At 1510, the UE may determine an SCS associated with the frequency band. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 5 to 8 Described in the SCS Manager to perform.

[0271] At 1515, the UE may select an MCS for a random access message of the random access procedure from the MCS set based on the frequency band and the SCS associated with the frequency band. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be as described with reference to Figures 5 to 8 The MCS manager described here is used to perform the

[0272] At 1520, the UE may determine a UE preference for a reference signal configuration for phase tracking based on the selected MCS. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed as described with reference to Figures 5 to 8 The described UE preference manager is used to perform.

[0273] At 1525, the UE may transmit an indication of the UE preference to the base station. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed as described with reference to Figures 5 to 8The described communication components are used to perform.

[0274] At 1530, the UE may transmit a random access message to the base station via the RACH of the frequency band according to the SCS and the selected MCS. The operation of 1530 may be performed according to the method described herein. In some examples, various aspects of the operation of 1530 may be performed as described with reference to Figures 5 to 8 The described communication components are used to perform.

[0275] Fig.16 1 is a flow chart illustrating a method 1600 for supporting MCS for high-band wireless communications according to aspects of the present disclosure. The operations of the method 1600 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by reference to Figures 9 to 12 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0276] At 1605, the base station may determine a frequency band that may be used for a random access procedure between the base station and the UE. The operations of 1605 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1605 may be performed as described in reference to Figures 9 to 12 The described band manager is implemented.

[0277] At 1610, the base station may determine an SCS associated with the frequency band. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 9 to 12 Described in the SCS Manager to perform.

[0278] At 1615, the base station may select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 9 to 12 The MCS manager described here is used to perform the

[0279] At 1620, the base station may transmit an indication of the selected MCS for the random access message to the UE. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be as described with reference to Figures 9 to 12 The described communication components are used to perform.

[0280] Fig.171 is a flow chart illustrating a method 1700 for supporting MCS for high-band wireless communications according to aspects of the present disclosure. The operations of the method 1700 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 1700 may be implemented by reference to Figures 9 to 12 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0281] At 1705, the base station may determine a frequency band that may be used for a random access procedure between the base station and the UE. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described in reference to Figures 9 to 12 The described band manager is implemented.

[0282] At 1710, the base station may determine an SCS associated with the frequency band. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 9 to 12 Described in the SCS Manager to perform.

[0283] At 1715, the base station may determine a threshold MCS based on the frequency band and the SCS associated with the frequency band. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed as described with reference to Figures 9 to 12 The threshold component described is implemented.

[0284] At 1720, the base station may select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band, wherein the selected MCS satisfies a threshold MCS. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be performed as described with reference to Figures 9 to 12 The MCS manager described here is used to perform the

[0285] At 1725, the base station may transmit an indication of the selected MCS for the random access message to the UE. The operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be as described with reference to Figures 9 to 12 The described communication components are used to perform.

[0286] Fig.18 1 is a flow chart illustrating a method 1800 for supporting MCS for high-band wireless communications according to aspects of the present disclosure. The operations of the method 1800 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 1800 may be implemented by reference to Figures 9 to 12 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0287] At 1805, the base station may determine a frequency band that may be used for a random access procedure between the base station and the UE. The operations of 1805 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1805 may be performed as described in reference to Figures 9 to 12 The described band manager is implemented.

[0288] At 1810, the base station may determine an SCS associated with the frequency band. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 9 to 12 The described SCS manager is executed.

[0289] At 1815, the base station may select an MCS for a random access message of the random access procedure from an MCS set based on the frequency band and the SCS associated with the frequency band. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed as described with reference to Figures 9 to 12 The MCS manager described here is used to perform the

[0290] At 1820, the base station may transmit an indication of the selected MCS for the random access message to the UE. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be as described with reference to Figures 9 to 12 The described communication components are used to perform.

[0291] At 1825, the base station may transmit to the UE an association between a random access preamble set, a random access opportunity set, and a reference signal configuration set. The operations of 1825 may be performed according to the methods described herein. In some examples, aspects of the operations of 1825 may be performed as described with reference to Figures 9 to 12 The random access manager described is performed.

[0292] At 1830, the base station may receive a random access message from the UE via a random access opportunity based on the association according to the random access preamble. The operations of 1830 may be performed according to the methods described herein. In some examples, aspects of the operations of 1830 may be as described with reference to Figures 9 to 12 The described communication components are used to perform.

[0293] At 1835, the base station may determine a reference signal configuration in the reference signal configuration set based on the random access preamble and the random access opportunity. The operations of 1835 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1835 may be performed as described with reference to Figures 9 to 12 Describes the reference signal configuration components to perform.

[0294] Fig.19 A flow chart illustrating a method 1900 for supporting a modulation and coding scheme for high frequency band wireless communication according to aspects of the present disclosure is shown. The operations of the method 1900 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1900 may be implemented by referring to Figures 5 to 8 The UE communication manager described herein may be used to perform the described functions. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0295] At 1905, the method may include receiving from a base station an indication of an MCS for a random access message of a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The operations of 1905 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1905 may be performed as described with reference to Figures 5 to 8 The MCS manager described here is used to perform the

[0296] At 1910, the method may include transmitting a random access message to a base station via a RACH of the frequency band according to the SCS and the MCS. The operations of 1910 may be performed according to the examples disclosed herein. In some examples, various aspects of the operations of 1910 may be performed as described with reference to Figures 5 to 8 The described communication components are used to perform.

[0297] Fig. 20 1 is a flow chart illustrating a method 2000 for supporting a modulation and coding scheme for high frequency band wireless communication according to aspects of the present disclosure. The operations of the method 2000 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 2000 may be implemented by referring to Figures 5 to 8 The UE communication manager described herein may be used to perform the described functions. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0298] At 2005, the method may include receiving from a base station an indication of an MCS for a random access message of a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The operations of 2005 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 2005 may be performed as described with reference to Figures 5 to 8 The MCS manager described here is used to perform the

[0299] At 2010, the method may optionally include selecting an MCS table from a set of MCS tables based on the frequency band and the SCS associated with the frequency band, wherein the MCS for the random access message is selected from the MCS table. The operations of 2010 may be performed according to the examples disclosed herein. In some examples, aspects of the operations of 2010 may be performed as described with reference to Figures 5 to 8 The MCS manager described here is used to perform the

[0300] At 2015, the method may include transmitting a random access message to a base station via a RACH of the frequency band according to the SCS and the MCS. The operations of 2015 may be performed according to the examples disclosed herein. In some examples, various aspects of the operations of 2015 may be performed as described with reference to Figures 5 to 8 The described communication components are used to perform.

[0301] Fig.21 A flow chart illustrating a method 2100 for supporting a modulation and coding scheme for high frequency band wireless communication according to aspects of the present disclosure is shown. The operations of the method 2100 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 2100 may be implemented by referring to Figures 5 to 8 The UE communication manager described herein may be used to perform the described functions. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0302] At 2105, the method may include receiving from a base station an indication of an MCS for a random access message of a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The operations of 2105 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 2105 may be performed as described with reference to Figures 5 to 8 The MCS manager described here is used to perform the

[0303] At 2110, the method may optionally include transmitting to the base station an indication of a UE preference for a reference signal configuration for phase tracking based on the MCS. The operations of 2110 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 2110 may be performed as described with reference to Figures 5 to 8The described UE preference manager is used to perform.

[0304] At 2115, the method may include transmitting a random access message to a base station via a RACH of the frequency band according to the SCS and the MCS. The operation of 2115 may be performed according to the examples disclosed herein. In some examples, various aspects of the operation of 2115 may be performed as described with reference to Figures 5 to 8 The described communication components are used to perform.

[0305] Fig. 22 A flow chart illustrating a method 2200 for supporting a modulation and coding scheme for high frequency band wireless communication according to aspects of the present disclosure is shown. The operations of the method 2200 may be implemented by a base station or components thereof as described herein. For example, the operations of the method 2200 may be implemented by a base station or components thereof as described herein. Figures 9 to 12 The base station may be executed by the base station communication manager described. In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the described functions.

[0306] At 2205, the method may include transmitting an indication of an MCS for a random access message of the random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The operations of 205 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 2205 may be performed as described with reference to Figures 9 to 12 The MCS manager described here is used to perform the

[0307] At 2210, the method may include receiving a random access message based on the MCS from the UE. The operations of 2210 may be performed according to the examples disclosed herein. In some examples, aspects of the operations of 2210 may be performed as described with reference to Figures 9 to 12 The described communication components are used to perform.

[0308] Fig.23 A flow chart illustrating a method 2300 for supporting a modulation and coding scheme for high frequency band wireless communication according to aspects of the present disclosure is shown. The operations of the method 2300 may be implemented by a base station or components thereof as described herein. For example, the operations of the method 2300 may be implemented by a base station or components thereof as described herein. Figures 9 to 12 The base station may be executed by the base station communication manager described. In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the described functions.

[0309] At 2305, the method may include transmitting an indication of an MCS for a random access message of the random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band. The operations of 2305 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 2305 may be performed as described with reference to Figures 9 to 12 The MCS manager described is executed.

[0310] At 2310, the method may include receiving a random access message based on the MCS from the UE. The operations of 2310 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 2310 may be performed as described with reference to Figures 9 to 12 The described communication components are used to perform.

[0311] At 2315, in order to receive a random access message, the method may optionally include receiving a random access message via a RACH of the frequency band according to the SCS and the MCS in response to an indication of the MCS. The operations of 2315 may be performed according to the examples disclosed herein. In some examples, aspects of the operations of 2315 may be performed as described with reference to Figures 9 to 12 The described communication components are used to perform.

[0312] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0313] The following provides an overview of various aspects of the disclosure:

[0314] Aspect 1: A method for wireless communication at a UE, comprising: receiving from a base station an indication of an MCS of a random access message for a random access procedure based on a frequency band for the random access procedure and an SCS associated with the frequency band; and transmitting a random access message to the base station via a RACH of the frequency band based on the SCS and the MCS.

[0315] Aspect 2: The method of Aspect 1 further comprises: selecting an MCS table from a set of MCS tables based at least in part on the frequency band and the SCS associated with the frequency band, wherein the MCS for the random access message is selected from the MCS table.

[0316] Aspect 3: The method of Aspect 2, wherein the MCS table includes an MCS set having a lower modulation order relative to all other MCS tables in the MCS table set.

[0317] Aspect 4: A method as in any one of Aspects 1 to 3, wherein receiving the indication comprises: receiving an uplink grant comprising a set of bits for conveying an indication of the MCS, wherein the set of bits comprises at least one reserved bit independent of conveying the indication of the MCS.

[0318] Aspect 5: The method of aspect 4, wherein the at least one reserved bit is associated with DMRS multiplexing for a random access message.

[0319] Aspect 6: The method of aspect 4, wherein the at least one reserved bit corresponds to a transport block size scaling value for a random access message.

[0320] Aspect 7: The method of any one of Aspects 1 to 6, wherein the MCS satisfies a threshold MCS based at least in part on the frequency band and an SCS associated with the frequency band.

[0321] Aspect 8: The method of Aspect 7, wherein the threshold MCS includes one of QPSK modulation and 16QAM.

[0322] Aspect 9: The method of any one of aspects 1 to 8, further comprising: transmitting to a base station an indication of a UE preference for a reference signal configuration for phase tracking based at least in part on the MCS.

[0323] Aspect 10: The method of Aspect 9 further comprises: transmitting one or more phase tracking reference signals according to the reference signal configuration, wherein the one or more phase tracking reference signals are transmitted together with the random access message.

[0324] Aspect 11: The method of any one of aspects 9 to 10, further comprising: selecting an MCS based at least in part on the reference signal configuration.

[0325] Aspect 12: The method of any one of aspects 9 to 11, transmitting the random access message comprises: transmitting a random access preamble during a random access opportunity based at least in part on a UE preference for a reference signal configuration.

[0326] Aspect 13: The method of Aspect 12 further includes: receiving an association between a random access preamble set, a random access timing set, and a reference signal configuration set; and selecting a random access preamble and a random access timing based at least in part on a second reference signal configuration in the reference signal configuration set corresponding to the reference signal configuration and the association.

[0327] Aspect 14: A method for wireless communication at a base station, comprising: transmitting an indication of an MCS for a random access message for a random access procedure based at least in part on a frequency band for a random access procedure and an SCS associated with the frequency band; and receiving a random access message from a UE based at least in part on the MCS.

[0328] Aspect 15: As in the method of Aspect 14, receiving the random access message comprises: receiving the random access message via the RACH of the frequency band according to the SCS and the MCS in response to an indication of the MCS.

[0329] Aspect 16: According to the method of any one of Aspects 14 to 15, transmitting an indication of the MCS comprises: transmitting an uplink grant comprising a set of bits for conveying an indication of the MCS, wherein the set of bits comprises at least one reserved bit independent of conveying the indication of the MCS.

[0330] Aspect 17: The method of Aspect 16, wherein the at least one reserved bit is associated with DMRS multiplexing for a random access message.

[0331] Aspect 18: The method of aspect 16, wherein the at least one reserved bit corresponds to a transport block size scaling value for a random access message.

[0332] Aspect 19: The method of any one of Aspects 14 to 18, wherein the MCS satisfies a threshold MCS based at least in part on the frequency band and an SCS associated with the frequency band.

[0333] Aspect 20: The method of Aspect 19, wherein the threshold MCS includes one of QPSK modulation and 16QAM.

[0334] Aspect 21: The method as described in any one of Aspects 14 to 20 further includes: transmitting an association between a random access preamble set, a random access timing set and a reference signal configuration set to a UE; receiving a random access message from the UE via a random access timing based at least in part on the association according to the random access preamble; and selecting a reference signal configuration from the reference signal configuration set based at least in part on the random access preamble and the random access timing.

[0335] Aspect 22: The method of any one of Aspects 14 to 21 further includes: receiving an indication of a UE preference for a reference signal configuration for phase tracking based at least in part on the MCS; and selecting the reference signal configuration for the phase tracking reference signal for the UE from a reference signal configuration set based at least in part on the UE preference.

[0336] Aspect 23: A method for performing wireless communications at a UE, comprising: determining a frequency band that can be used for a random access procedure between the UE and a base station; determining an SCS associated with the frequency band; selecting a modulation and coding scheme for a random access message of the random access procedure from a set of modulation and coding schemes based at least in part on the frequency band and the SCS associated with the frequency band; and transmitting the random access message to the base station via the RACH of the frequency band based on the SCS and the selected modulation and coding scheme.

[0337] Aspect 24: The method of aspect 23 further comprises: receiving an indication of the modulation and coding scheme to be selected from the set of modulation and coding schemes from a base station, wherein the modulation and coding scheme is selected based at least in part on the indication.

[0338] Aspect 25: A method as in Aspect 24, wherein receiving the indication comprises: receiving an uplink grant comprising a set of bits for conveying an indication of the modulation and coding scheme, wherein the set of bits comprises at least one reserved bit independent of conveying the indication of the modulation and coding scheme.

[0339] Aspect 26: The method of Aspect 25, wherein the at least one reserved bit is associated with DMRS multiplexing for a random access message.

[0340] Aspect 27: The method of Aspect 25, wherein the at least one reserved bit corresponds to a transport block size scaling value for a random access message.

[0341] Aspect 28: The method of any one of Aspects 23 to 27, further comprising: determining a threshold modulation and coding scheme based at least in part on the frequency band and the SCS associated with the frequency band, wherein the selected modulation and coding scheme satisfies the threshold modulation and coding scheme.

[0342] Aspect 29: The method of aspect 28, wherein the threshold modulation and coding scheme comprises one of QPSK modulation and 16QAM.

[0343] Aspect 30: The method of any one of Aspects 23 to 29, further comprising: determining a UE preference for a reference signal configuration for phase tracking based at least in part on a selected modulation and coding scheme; and transmitting an indication of the UE preference to a base station.

[0344] Aspect 31: The method of Aspect 30 further comprises: transmitting one or more phase tracking reference signals according to the reference signal configuration, wherein the one or more phase tracking reference signals are transmitted together with the random access message.

[0345] Aspect 32: The method of any one of Aspects 30 to 31, further comprising: selecting a modulation and coding scheme based at least in part on the reference signal configuration.

[0346] Aspect 33: The method of any one of aspects 30 to 32, further comprising: determining a random access preamble and a random access opportunity based at least in part on a UE preference for a reference signal configuration.

[0347] Aspect 34: The method of Aspect 33 further includes: determining the association between a random access preamble set, a random access timing set, and a reference signal configuration set; and selecting a random access preamble and a random access timing based at least in part on a second reference signal configuration in the reference signal configuration set corresponding to the reference signal configuration.

[0348] Aspect 35: The method of any one of Aspects 1 to 34 further comprises: selecting a modulation and coding scheme table from a set of modulation and coding scheme tables based at least in part on the frequency band and the SCS associated with the frequency band, wherein the modulation and coding scheme used for the random access message is selected from the modulation and coding scheme table.

[0349] Aspect 36: The method of Aspect 35, wherein the modulation and coding scheme table comprises an MCS set having a lower modulation order relative to all other modulation and coding scheme tables in the set of modulation and coding scheme tables.

[0350] Aspect 37: A method for wireless communication at a base station, comprising: determining a frequency band that can be used for a random access procedure between a base station and a user equipment (UE); determining an SCS associated with the frequency band; selecting a modulation and coding scheme for a random access message of the random access procedure from a set of modulation and coding schemes based at least in part on the frequency band and the SCS associated with the frequency band; and transmitting an indication of the selected modulation and coding scheme for the random access message to the UE.

[0351] Aspect 38: The method of aspect 38 further comprises: receiving a random access message from the UE via the RACH of the frequency band according to the SCS and the selected modulation and coding scheme in response to an indication of the selected modulation and coding scheme.

[0352] Aspect 39: A method as in any of Aspects 37 to 38, wherein transmitting an indication of a selected modulation and coding scheme comprises: transmitting an uplink grant comprising a set of bits for conveying an indication of the modulation and coding scheme, wherein the set of bits comprises at least one reserved bit independent of conveying the indication of the modulation and coding scheme.

[0353] Aspect 40: The method of aspect 39, wherein the at least one reserved bit is associated with DMRS multiplexing for a random access message.

[0354] Aspect 41: The method of aspect 39, wherein the at least one reserved bit corresponds to a transport block size scaling value for a random access message.

[0355] Aspect 42: The method of any one of Aspects 37 to 41, further comprising: determining a threshold modulation and coding scheme based at least in part on the frequency band and the SCS associated with the frequency band, wherein the selected modulation and coding scheme satisfies the threshold modulation and coding scheme.

[0356] Aspect 43: The method of aspect 42, wherein the threshold modulation and coding scheme comprises one of QPSK modulation and 16QAM.

[0357] Aspect 44: The method as described in any one of Aspects 37 to 43 further includes: transmitting an association between a random access preamble set, a random access timing set and a reference signal configuration set to a UE; receiving a random access message from the UE via a random access timing based at least in part on the association according to the random access preamble; and selecting a reference signal configuration from the reference signal configuration set based at least in part on the random access preamble and the random access timing.

[0358] Aspect 45: The method of any one of Aspects 37 to 44 further includes: receiving an indication of a UE preference for a reference signal configuration for phase tracking based at least in part on a selected modulation and coding scheme; and determining the reference signal configuration for a phase tracking reference signal for the UE based at least in part on the UE preference.

[0359] Aspect 46: An apparatus for performing wireless communication at 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 apparatus to perform a method as in any one of Aspects 1 to 13.

[0360] Aspect 47: An apparatus for wireless communication at a UE, comprising at least one means for performing the method of any one of aspects 1 to 13.

[0361] Aspect 48: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 13.

[0362] Aspect 49: An apparatus for performing wireless communications at a base station, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as described in any one of Aspects 14 to 22.

[0363] Aspect 50: An apparatus for wireless communication at a base station, comprising at least one means for performing the method of any one of aspects 14 to 22.

[0364] Aspect 51: A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to perform the method of any one of aspects 14 to 22.

[0365] Aspect 52: An apparatus for wireless communication at a donor node in a wireless communication system, comprising at least one means for performing a method as in any one of Examples 23 to 36.

[0366] Aspect 53: An apparatus for wireless communication at a donor node in a wireless communication system, comprising a processor and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of Examples 23 to 36.

[0367] Aspect 54: A non-transitory computer-readable medium storing code for wireless communication at a donor node in a wireless communication system, comprising: a processor; a memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the device to perform a method as in any one of Examples 23 to 36.

[0368] Aspect 55: An apparatus for wireless communication at a donor node in a wireless communication system, comprising at least one device for performing a method as in any one of Examples 37 to 45.

[0369] Aspect 56: An apparatus for wireless communication at a donor node in a wireless communication system, comprising a processor and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of Examples 37 to 45.

[0370] Aspect 57: A non-transitory computer-readable medium storing code for wireless communication at a donor node in a wireless communication system, comprising: a processor; a memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the device to perform a method as in any one of Examples 37 to 45.

[0371] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applied to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0372] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0373] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0374] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0375] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another place.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Similarly, any connection is also properly referred to as computer-readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then this coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of computer-readable medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0376] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0377] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0378] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that can be implemented or fall within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0379] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the universal principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A user equipment (UE) for wireless communication, comprising: Memory; as well as at least one processor coupled to the memory, wherein the UE is configured to: receiving, from a network node in a single uplink grant and prior to a random access procedure, a set of bits comprising both an indication of a modulation and coding scheme for a random access message of the random access procedure and at least one reserved bit independent of the indication, wherein the at least one reserved bit corresponds to a transport block size scaling value of the random access message; selecting a modulation and coding scheme table from a set of modulation and coding scheme tables based on a frequency band used for the random access procedure and a subcarrier spacing associated with the frequency band, wherein the modulation and coding scheme indicated by the uplink grant is included in the selected modulation and coding scheme table; as well as The random access message is transmitted to the network node via a random access channel of the frequency band and during the random access procedure according to the subcarrier spacing and the modulation and coding scheme.

2. The UE according to claim 1, wherein: The modulation and coding scheme table comprises a set of modulation and coding schemes having lower modulation orders relative to other modulation and coding scheme orders in all other modulation and coding scheme tables in the set of modulation and coding scheme tables.

3. The UE according to claim 1, wherein: The at least one reserved bit is multiplexed associated with a demodulation reference signal (DMRS) for the random access message.

4. The UE according to claim 1, wherein: The modulation and coding scheme satisfies a threshold modulation and coding scheme based on the frequency band and the subcarrier spacing associated with the frequency band.

5. The UE according to claim 4, wherein: The threshold modulation and coding scheme includes one of Quadrature Phase Shift Keying (QPSK) modulation or 16 Quadrature Amplitude Modulation (QAM).

6. The UE according to claim 1, wherein: The UE is configured to: An indication of a UE preference for a reference signal configuration for phase tracking based on the modulation and coding scheme is transmitted to the network node.

7. The UE according to claim 6, wherein: The UE is configured to: One or more phase tracking reference signals are transmitted according to the reference signal configuration, wherein the one or more phase tracking reference signals are transmitted together with the random access message.

8. The UE according to claim 6, wherein: The UE is configured to: The reference signal configuration is selected based on the modulation and coding scheme.

9. The UE according to claim 6, wherein: In order to transmit the random access message, the UE is configured to: A random access preamble is transmitted during a random access opportunity based on the UE preference for the reference signal configuration.

10. The UE according to claim 9, wherein: The UE is configured to: receiving an association between a set of random access preambles, a set of random access opportunities, and a set of reference signal configurations; as well as The random access preamble and the random access opportunity are selected based on a second reference signal configuration in the reference signal configuration set corresponding to the reference signal configuration and the association.

11. The UE according to claim 1, further comprising: An antenna is coupled to the at least one processor.

12. A network node for wireless communication, comprising: Memory; as well as at least one processor coupled to the memory, wherein the network node is configured to: selecting a modulation and coding scheme for a random access procedure based on a frequency band for the random access procedure and a subcarrier spacing associated with the frequency band, wherein the modulation and coding scheme is included in a modulation and coding scheme table in a set of modulation and coding scheme tables, wherein each modulation and coding scheme table in the set of modulation and coding scheme tables is associated with a different frequency band and subcarrier spacing; transmitting, in a single uplink grant and prior to the random access procedure, a set of bits comprising both an indication of a modulation and coding scheme to be used for the random access procedure based on the selection and at least one reserved bit independent of the indication, and wherein the at least one reserved bit corresponds to a transport block size scaling value of a random access message; as well as The random access message based on the modulation and coding scheme is received during the random access procedure.

13. The network node according to claim 12, wherein: In order to receive the random access message, the network node is configured to: The random access message is received via a random access channel of the frequency band according to the subcarrier spacing and the modulation and coding scheme in response to the indication of the modulation and coding scheme.

14. The network node according to claim 12, wherein: The at least one reserved bit is multiplexed associated with a demodulation reference signal (DMRS) for the random access message.

15. The network node according to claim 12, wherein: The modulation and coding scheme satisfies a threshold modulation and coding scheme based on the frequency band and the subcarrier spacing associated with the frequency band.

16. The network node according to claim 15, wherein: The threshold modulation and coding scheme includes one of Quadrature Phase Shift Keying (QPSK) modulation or 16 Quadrature Amplitude Modulation (QAM).

17. The network node of claim 12, wherein: The network node is configured to: transmitting an association between a random access preamble set, a random access opportunity set and a reference signal configuration set to a user (UE); receiving the random access message from the UE via a random access opportunity based on the association according to a random access preamble; as well as A reference signal configuration is selected from the reference signal configuration set based on the random access preamble and the random access opportunity.

18. The network node of claim 12, wherein: The network node is configured to: receiving an indication of a UE preference for a reference signal configuration for phase tracking based on the modulation and coding scheme; as well as The reference signal configuration is selected from a set of reference signal configurations for a phase tracking reference signal for the UE based on the UE preference.

19. The network node of claim 12, further comprising: An antenna is coupled to the at least one processor.

20. A method of performing wireless communication by a user equipment (UE), comprising: receiving, from a network node in a single uplink grant and prior to a random access procedure, a set of bits comprising both an indication of a modulation and coding scheme for a random access message of the random access procedure and at least one reserved bit independent of the indication, wherein the at least one reserved bit corresponds to a transport block size scaling value of the random access message; selecting a modulation and coding scheme table from a set of modulation and coding scheme tables based on a frequency band used for the random access procedure and a subcarrier spacing associated with the frequency band, wherein the selected modulation and coding scheme indicated by the uplink grant is included in the selected modulation and coding scheme table; as well as The random access message is transmitted to the network node via a random access channel of the frequency band and during the random access procedure according to the subcarrier spacing and the modulation and coding scheme.

21. The method of claim 20, wherein: The modulation and coding scheme table comprises a set of modulation and coding schemes having lower modulation orders relative to other modulation and coding scheme orders in all other modulation and coding scheme tables in the set of modulation and coding scheme tables.

22. A method for performing wireless communication by a network node, comprising: selecting a modulation and coding scheme for a random access procedure based on a frequency band for the random access procedure and a subcarrier spacing associated with the frequency band, wherein the modulation and coding scheme is included in a modulation and coding scheme table in the set of modulation and coding scheme tables, wherein each modulation and coding scheme table in the set of modulation and coding scheme tables is associated with a different frequency band and subcarrier spacing; transmitting, in a single uplink grant and prior to the random access procedure, a set of bits comprising both an indication of a modulation and coding scheme for the random access procedure based on the selection and at least one reserved bit independent of the indication, and wherein the at least one reserved bit corresponds to a transport block size scaling value of a random access message; as well as The random access message based on the modulation and coding scheme is received during the random access procedure.

23. The method of claim 22, wherein: Receiving the random access message includes: The random access message is received via a random access channel of the frequency band according to the subcarrier spacing and the modulation and coding scheme in response to the indication of the modulation and coding scheme.

Images