Transport block size determination for sidelink communications

Abstract

Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise referred to as a user equipment (UE), may support direct communications with other communication devices (e.g., direct communications between multiple UEs). Direct communications may include, but are not limited to, device-to-device (D2D) communications, vehicle-based communications (which may also be referred to as vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications), and the like. In examples of V2X communications, V2V communications, and the like, a UE may identify sidelink information for sidelink communications; encode the sidelink information for sidelink communications based on a transport block size (TBS); determine a TBS for the sidelink information based on an overhead size of a second physical sidelink channel for conveying the sidelink information; and transmit the sidelink information on a physical sidelink channel.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. patent application No. 17 / 138,849, filed by Sarkis et al. on December 30, 2020, entitled “TRANSPORT BLOCKSIZE DETERMINATION FOR SIDELINK COMMUNICATIONS,” which claims the benefit of U.S. Provisional Patent Application No. 62 / 957,037, filed by Sarkis et al. on January 3, 2020, entitled “TRANSPORT BLOCK SIZE DETERMINATION FOR SIDELINK COMMUNICATIONS,” which applications are assigned to the assignee of this application.

[0003] introduction

[0004] The following relates to wireless communications, and more particularly to direct communications between communication devices in a wireless communication system.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, 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 employ 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 spread orthogonal frequency division multiplexing (DFT-S-OFDM).

[0006] 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 communication of multiple communication devices, which may be further referred to as user equipment (UE). Some wireless communication systems may support direct communication between communication devices (e.g., direct communication between multiple UEs). Examples of direct communication may include device-to-device (D2D) communication, vehicle-based communication (which may also be referred to as vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication), etc. As the demand for communication efficiency increases, some wireless communication systems may be expected to improve direct communication operations (e.g., improve the reliability or latency of direct communication), etc.

[0007] Overview

[0008] A method for wireless communication is described. The method may include encoding sidelink information for sidelink communication based on a transport block size (TBS); and transmitting the encoded sidelink information on a physical sidelink channel, the TBS being based on an overhead of a second physical sidelink channel used to communicate the sidelink information.

[0009] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, the processor and the memory configured to: encode sidelink information for sidelink communication based on a TBS; and transmit the encoded sidelink information on a physical sidelink channel, the TBS being based on an overhead of a second physical sidelink channel used to communicate the sidelink information.

[0010] Another apparatus for wireless communication is described. The apparatus may include means for encoding sidelink information for sidelink communication based on a TBS based on an overhead of a second physical sidelink channel used to communicate the sidelink information, and for transmitting the encoded sidelink information on a physical sidelink channel.

[0011] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: encode sidelink information for sidelink communication based on a TBS; and transmit the encoded sidelink information on a physical sidelink channel, the TBS being based on an overhead of a second physical sidelink channel used to communicate the sidelink information.

[0012] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining an estimated number of REs associated with a physical resource block for sidelink communication, and wherein the TBS may be based on the estimated number of REs associated with the physical resource block.

[0013] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for: determining the number of physical resource blocks allocated for sidelink communication; determining the number of REs associated with the physical resource blocks allocated for sidelink communication based on the number of allocated physical resource blocks or the estimated number of REs associated with the physical resource blocks, or both, and wherein the TBS may be based on the number of REs associated with the physical resource blocks allocated for sidelink communication.

[0014] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting signaling including an indication of the number of codewords to be used for TBS determination, and wherein the TBS may be based on the signaling.

[0015] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for: determining a number of allocated symbols associated with a physical side link channel, the physical side link channel comprising a physical side link control channel; subtracting the number of symbols to be used for TBS determination from the number of allocated symbols associated with the physical side link channel, and wherein determining an estimated number of REs associated with a physical resource block can be based on the subtraction.

[0016] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: Determining an estimated number of REs associated with a physical resource block may be based on the number of codewords to be used for TBS determination.

[0017] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: determining the number of REs used for the first side link control information, subtracting the number of REs used for the first side link control information from the number of REs associated with the allocated physical resource blocks, and wherein the TBS can be based on the subtraction.

[0018] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting side link information on a physical side link channel may include operations, features, devices, or instructions for transmitting first side link control information on a physical side link control channel based on TBS.

[0019] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining that a first physical side link channel and a second physical side link channel may be frequency division multiplexed, the first physical side link channel comprising a physical side link shared channel, and the second physical side link channel comprising a physical side link control channel, and wherein the TBS may be based on the first physical side link channel and the second physical side link channel being frequency division multiplexed.

[0020] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining the number of REs occupied by a physical side link shared channel associated with an allocated physical resource block; and adjusting an overhead of a physical side link control channel based at least in part on the value of the number of REs occupied by the physical side link shared channel, wherein the overhead of the physical side link control channel may be time slot by time slot.

[0021] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining that a first physical side link channel and a second physical side link channel may be time division multiplexed, the first physical side link channel comprising a physical side link shared channel, and the second physical side link channel comprising a physical side link control channel, and wherein the TBS may be based on determining that the first physical side link channel and the second physical side link channel may be time division multiplexed.

[0022] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining an overhead of a physical side link control channel per physical resource block based on determining that a first physical side link channel and a second physical side link channel may be time division multiplexed, and wherein the TBS may be based on the overhead of the physical side link control channel per physical resource block.

[0023] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining the number of codewords associated with a physical side link control channel or a physical side link shared channel, or both; determining the number of codewords that exclusively include the physical side link control channel; excluding the number of codewords that exclusively include the physical side link control channel from the estimated number of REs associated with the physical resource blocks or the number of REs associated with the allocated physical resource blocks, or both, and wherein the TBS may be based on the exclusion.

[0024] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the TBS may be slot-by-slot based on an overhead of a physical sidelink control channel.

[0025] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for determining the number of REs used for second side link control information, subtracting the number of REs used for the second side link control information from an estimated number of REs associated with a physical resource block or the number of REs associated with an allocated physical resource block, or both, and wherein the TBS may be based on the subtraction.

[0026] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining a control overhead associated with the second side link control information based on a target code rate associated with a modulation and coding scheme, and wherein the TBS may be based on the control overhead associated with the second side link control information.

[0027] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining a control overhead associated with the second side link control information; ignoring the control overhead associated with the second side link control information, and wherein the TBS may be based on ignoring the control overhead associated with the second side link control information.

[0028] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: identifying a modulation and coding scheme for sidelink communication; identifying a target code rate based on the modulation and coding scheme for sidelink communication, and wherein determining the number of REs for second sidelink control information can be based on the target code rate.

[0029] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting side link information on a physical side link channel may include operations, features, devices, or instructions for transmitting second side link control information on a physical side link shared channel based on TBS.

[0030] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for transmitting signaling including an indication of an overhead value, and wherein determining an estimated number of REs associated with a physical resource block may be based on the signaled overhead value.

[0031] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for transmitting signaling including an indication of an offset overhead value relative to a demodulation reference signal pattern, and wherein determining an estimated number of REs associated with a physical resource block can be based on the offset overhead value notified by the signaling.

[0032] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for adjusting the number of REs associated with a physical resource block allocated for sidelink communication to the number of REs associated with a physical resource block allocated for non-sidelink communication.

[0033] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining channel state information reference signal overhead; suppressing use of channel state information reference signal overhead in determining an estimated number of REs associated with a physical resource block or in determining the number of REs associated with an allocated physical resource block, or both, and wherein TBS may be based on the omission.

[0034] A method for wireless communication is described. The method may include decoding sidelink information for sidelink communication based on a TBS based on an overhead of a second physical sidelink channel used to communicate the sidelink information; and receiving the decoded sidelink information on a physical sidelink channel.

[0035] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, the processor and the memory configured to: decode sidelink information for sidelink communication based on a TBS; and receive the decoded sidelink information on a physical sidelink channel, the TBS being based on an overhead of a second physical sidelink channel used to communicate the sidelink information.

[0036] Another apparatus for wireless communication is described. The apparatus may include means for decoding sidelink information for sidelink communication based on a TBS; and receiving the decoded sidelink information on a physical sidelink channel, the TBS being based on an overhead of a second physical sidelink channel used to communicate the sidelink information.

[0037] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: decode sidelink information for sidelink communication based on a TBS; and receive the decoded sidelink information on a physical sidelink channel, the TBS being based on an overhead of a second physical sidelink channel used to communicate the sidelink information.

[0038] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining an estimated number of REs associated with a physical resource block for sidelink communication, and wherein the TBS may be based on the estimated number of REs associated with the physical resource block.

[0039] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for: determining the number of physical resource blocks allocated for sidelink communication; determining the number of REs associated with the physical resource blocks allocated for sidelink communication based on the number of allocated physical resource blocks or the estimated number of REs associated with the physical resource blocks, or both, and wherein the TBS may be based on the number of REs associated with the physical resource blocks allocated for sidelink communication.

[0040] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: determining the number of REs used for the first side link control information, subtracting the number of REs used for the first side link control information from the number of REs associated with the allocated physical resource blocks, and wherein the TBS can be based on the subtraction.

[0041] A method of wireless communication is described. The method may include identifying sidelink control information (SCI) for sidelink communication; determining a TBS for the SCI; and transmitting the SCI on a physical sidelink channel based on the TBS.

[0042] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: identify an SCI for sidelink communication; determine a TBS for the SCI; and transmit the SCI on a physical sidelink channel based on the TBS.

[0043] Another apparatus for wireless communication is described. The apparatus may include means for: identifying an SCI for sidelink communication; determining a TBS for the SCI; and transmitting the SCI on a physical sidelink channel based on the TBS.

[0044] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: identify a SCI for sidelink communication; determine a TBS for the SCI; and transmit the SCI on a physical sidelink channel based on the TBS.

[0045] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining an estimated number of REs associated with a physical resource block (PRB) for sidelink communication, wherein determining the TBS may be based on the estimated number of REs associated with the PRB.

[0046] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for: determining the number of PRBs allocated for sidelink communication; determining the number of REs associated with the PRBs used for sidelink communication based on the number of allocated PRBs or the estimated number of REs associated with the PRBs, or both, wherein determining the TBS may be based on the number of REs associated with the PRBs used for sidelink communication.

[0047] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: determining the number of REs used for the first SCI; subtracting the number of REs used for the first SCI from the estimated number of REs associated with PRBs or the number of REs associated with PRBs, or both, wherein determining the TBS can be based on the subtraction.

[0048] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining a control overhead associated with a first SCI; suppressing the use of control overhead in an estimated number of REs associated with a PRB or a number of REs associated with a PRB, or both, wherein determining the TBS may be based on the suppression.

[0049] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, transmitting an SCI on a physical sidelink channel may include operations, features, apparatus, or instructions for transmitting a first SCI on a physical sidelink control channel (PSCCH) based on a TBS.

[0050] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining that a first physical side link channel and a second physical side link channel may be frequency division multiplexed, the first physical side link channel comprising a physical side link shared channel (PSSCH), and the second physical side link channel comprising a PSCCH, wherein determining the TBS may be based on the fact that the first physical side link channel and the second physical side link channel may be frequency division multiplexed.

[0051] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: determining the number of REs occupied by the PSSCH associated with a PRB; and scaling the PSCCH overhead by the value of the REs occupied by the PSSCH.

[0052] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: Determining the TBS may be based on an overhead of the PSCCH per time slot.

[0053] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining that a first physical side link channel and a second physical side link channel may be time division multiplexed, the first physical side link channel comprising a PSSCH, and the second physical side link channel comprising a PSCCH, wherein determining TBS may be based on that the first physical side link channel and the second physical side link channel may be time division multiplexed.

[0054] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining an overhead of the PSCCH per PRB based on that the first side link channel and the second physical side link may be time division multiplexed, wherein determining the TBS may be based on the overhead of the PSCCH per PRB.

[0055] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining the number of codewords associated with PSCCH or PSSCH or both; determining the number of codewords that exclusively include PSCCH; excluding the number of codewords that exclusively include PSCCH from the estimated number of REs associated with PRBs or the number of REs associated with PRBs, or both, wherein determining TBS can be based on the exclusion.

[0056] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: Determining the TBS may be based on an overhead of the PSCCH per time slot.

[0057] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining the number of REs used for the second SCI; subtracting the number of REs used for the second SCI from the estimated number of REs associated with PRBs or the number of REs associated with PRBs, or both, wherein determining the TBS can be based on the subtraction.

[0058] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining a control overhead associated with a second SCI based on a target code rate associated with a modulation coding scheme, wherein determining the TBS may be based on the control overhead associated with the second SCI.

[0059] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: ignoring control overhead associated with the second SCI, wherein determining the TBS may be based on ignoring the control overhead associated with the second SCI.

[0060] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: identifying a modulation and coding scheme for a second SCI; identifying a target code rate based on the modulation and coding scheme for the second SCI, wherein determining the number of REs for the second SCI may be based on the target code rate.

[0061] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting the SCI on the physical side link channel may include operations, features, means, or instructions for transmitting a second SCI on the PSSCH based on the TBS.

[0062] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for transmitting signaling including an indication of an overhead value, wherein determining an estimated number of REs associated with a PRB may be based on the signaled overhead value.

[0063] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: transmitting signaling including an indication of an offset overhead value relative to a demodulation reference signal pattern, wherein determining an estimated number of REs associated with a PRB can be based on the offset overhead value notified by the signaling.

[0064] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: transmitting signaling including an indication of the number of codewords to be used for TBS determination, wherein determining the TBS can be based on the signaling.

[0065] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining a number of allocated symbols associated with a physical side link channel, the physical side link channel comprising a PSCCH; subtracting the number of symbols to be used for TBS determination from the number of allocated symbols associated with the physical side link channel, wherein determining an estimated number of REs associated with a PRB can be based on the subtraction.

[0066] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: Determining an estimated number of REs associated with a PRB may be based on the number of symbols to be used for TBS determination.

[0067] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for adjusting the number of REs associated with a PRB for sidelink communication to the number of REs associated with a PRB for non-sidelink communication.

[0068] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining channel state information reference signal overhead; suppressing use of channel state information reference signal overhead in determining an estimated number of REs associated with a PRB or in determining the number of REs associated with a PRB, or both, wherein determining TBS may be based on this omission.

[0069] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining a number of subcarriers associated with a PRB, wherein determining an estimated number of REs associated with the PRB may be based on the number of subcarriers associated with the PRB.

[0070] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining an allocated number of symbols associated with a physical side link channel, wherein determining an estimated number of REs associated with a PRB may be based on one or more of a number of subcarriers associated with the PRB and an allocated number of symbols associated with the physical side link channel.

[0071] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining a demodulation reference signal overhead associated with a PRB, wherein determining an estimated number of REs associated with the PRB may be based on the reference signal overhead associated with the PRB.

[0072] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining a control overhead associated with a PRB, wherein determining an estimated number of REs associated with the PRB may be based on the control overhead associated with the PRB.

[0073] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining an overhead of a physical side link channel based on a period of the physical side link channel, wherein determining the TBS may be based on the overhead of the physical side link channel.

[0074] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the physical side link channel includes a physical side link feedback channel.

[0075] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for scaling an overhead of a physical side link channel based on the period of the physical side link channel, wherein determining the TBS may be based on the scaling.

[0076] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining an average value of the overhead of the physical side link channel over the time period of the physical side link channel, wherein determining the TBS may be based on the average value of the overhead of the physical side link channel over the time period of the physical side link channel.

[0077] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for applying an overhead of a physical sidelink channel as a value per PRB, wherein determining the TBS may be based on the application.

[0078] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the overhead of the physical side link channel corresponds to the number of available symbols of a second physical side link channel, the second physical side link channel comprising the PSSCH.

[0079] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the physical sidelink channel includes a PSSCH.

[0080] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the physical sidelink channel includes a PSCCH.

[0081] A method of wireless communication is described. The method may include: identifying a SCI for sidelink communication; determining a TBS for the SCI; and receiving the SCI on a physical sidelink channel based on the TBS.

[0082] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: identify an SCI for sidelink communication; determine a TBS for the SCI; and receive the SCI on a physical sidelink channel based on the TBS.

[0083] Another apparatus for wireless communication is described. The apparatus may include means for: identifying an SCI for sidelink communication; determining a TBS for the SCI; and receiving the SCI on a physical sidelink channel based on the TBS.

[0084] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: identify an SCI for sidelink communication; determine a TBS for the SCI; and receive the SCI on a physical sidelink channel based on the TBS.

[0085] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining an estimated number of REs associated with a physical resource block (PRB) for sidelink communication, wherein determining the TBS may be based on the estimated number of REs associated with the PRB.

[0086] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for: determining the number of PRBs allocated for sidelink communication; determining the number of REs associated with the PRBs used for sidelink communication based on the number of allocated PRBs or the estimated number of REs associated with the PRBs, or both, wherein determining the TBS may be based on the number of REs associated with the PRBs used for sidelink communication.

[0087] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: determining the number of REs used for the first SCI, subtracting the number of REs used for the first SCI from the estimated number of REs associated with PRBs or the number of REs associated with PRBs, or both, wherein determining the TBS can be based on the subtraction.

[0088] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining a control overhead associated with a first SCI; suppressing the use of control overhead in an estimated number of REs associated with a PRB or a number of REs associated with a PRB, or both, wherein determining the TBS may be based on the suppression.

[0089] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving an SCI on a physical sidelink channel may include operations, features, devices, or instructions for receiving a first SCI on a PSCCH based on a TBS.

[0090] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining that a first physical side link channel and a second physical side link channel may be frequency division multiplexed, the first physical side link channel comprising a PSSCH, and the second physical side link channel comprising a PSCCH, wherein determining the TBS may be based on the fact that the first physical side link channel and the second physical side link channel may be frequency division multiplexed.

[0091] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: determining the number of REs occupied by the PSSCH associated with a PRB; and scaling the PSCCH overhead by the value of the REs occupied by the PSSCH.

[0092] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: Determining the TBS may be based on an overhead of the PSCCH per time slot.

[0093] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining that a first physical side link channel and a second physical side link channel may be time division multiplexed, the first physical side link channel comprising a PSSCH, and the second physical side link channel comprising a PSCCH, wherein determining TBS may be based on that the first physical side link channel and the second physical side link channel may be time division multiplexed.

[0094] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining an overhead of the PSCCH per PRB based on that the first side link channel and the second physical side link may be time division multiplexed, wherein determining the TBS may be based on the overhead of the PSCCH per PRB.

[0095] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining the number of codewords associated with PSCCH or PSSCH or both; determining the number of codewords that exclusively include PSCCH; excluding the number of codewords that exclusively include PSCCH from the estimated number of REs associated with PRBs or the number of REs associated with PRBs, or both, wherein determining TBS can be based on the exclusion.

[0096] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: Determining the TBS may be based on an overhead of the PSCCH per time slot.

[0097] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining the number of REs used for the second SCI; subtracting the number of REs used for the second SCI from the estimated number of REs associated with PRBs or the number of REs associated with PRBs, or both, wherein determining the TBS can be based on the subtraction.

[0098] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining a control overhead associated with a second SCI based on a target code rate associated with a modulation coding scheme, wherein determining the TBS may be based on the control overhead associated with the second SCI.

[0099] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: ignoring control overhead associated with the second SCI, wherein determining the TBS may be based on ignoring the control overhead associated with the second SCI.

[0100] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: identifying a modulation and coding scheme for a second SCI; identifying a target code rate based on the modulation and coding scheme for the second SCI, wherein determining the number of REs for the second SCI may be based on the target code rate.

[0101] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving SCI on a physical sidelink channel may include operations, features, means, or instructions for receiving a second SCI on a PSSCH based on a TBS.

[0102] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving signaling including an indication of an overhead value, wherein determining an estimated number of REs associated with a PRB can be based on the signaled overhead value.

[0103] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving signaling including an indication of an offset overhead value relative to a demodulation reference signal pattern, wherein determining an estimated number of REs associated with a PRB can be based on the offset overhead value notified by the signaling.

[0104] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving signaling including an indication of the number of codewords to be used for TBS determination, wherein determining the TBS can be based on the signaling.

[0105] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining a number of allocated symbols associated with a physical side link channel, the physical side link channel comprising a PSCCH; subtracting the number of symbols to be used for TBS determination from the number of allocated symbols associated with the physical side link channel, wherein determining an estimated number of REs associated with a PRB can be based on the subtraction.

[0106] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: Determining an estimated number of REs associated with a PRB may be based on the number of symbols to be used for TBS determination.

[0107] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for adjusting the number of REs associated with a PRB for sidelink communication to the number of REs associated with a PRB for non-sidelink communication.

[0108] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining channel state information reference signal overhead; suppressing use of channel state information reference signal overhead in determining an estimated number of REs associated with a PRB or in determining the number of REs associated with a PRB, or both, wherein determining TBS may be based on this omission.

[0109] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining a number of subcarriers associated with a PRB, wherein determining an estimated number of REs associated with the PRB may be based on the number of subcarriers associated with the PRB.

[0110] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining an allocated number of symbols associated with a physical side link channel, wherein determining an estimated number of REs associated with a PRB may be based on one or more of a number of subcarriers associated with the PRB and an allocated number of symbols associated with the physical side link channel.

[0111] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining a demodulation reference signal overhead associated with a PRB, wherein determining an estimated number of REs associated with the PRB may be based on the reference signal overhead associated with the PRB.

[0112] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining a control overhead associated with a PRB, wherein determining an estimated number of REs associated with the PRB may be based on the control overhead associated with the PRB.

[0113] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining an overhead of a physical side link channel based on a period of the physical side link channel, wherein determining the TBS may be based on the overhead of the physical side link channel.

[0114] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the physical side link channel includes a physical side link feedback channel.

[0115] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for scaling an overhead of a physical side link channel based on the period of the physical side link channel, wherein determining the TBS may be based on the scaling.

[0116] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining an average value of the overhead of the physical side link channel over the time period of the physical side link channel, wherein determining the TBS may be based on the average value of the overhead of the physical side link channel over the time period of the physical side link channel.

[0117] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for applying an overhead of a physical sidelink channel as a value per PRB, wherein determining the TBS may be based on the application.

[0118] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the overhead of the physical side link channel corresponds to the number of available symbols of a second physical side link channel, the second physical side link channel comprising the PSSCH.

[0119] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the physical sidelink channel includes a PSSCH.

[0120] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the physical sidelink channel includes a PSCCH.

[0121] A wireless communication method is described. The method may include: allocating resources for sidelink communication on a physical sidelink channel; transmitting signaling including an indication of the resources for sidelink communication based on the allocation; and receiving an SCI on the physical sidelink channel based on the signaling, wherein a TBS for the SCI is determined based on the indication of the resources for sidelink communication.

[0122] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: allocate resources for sidelink communication on a physical sidelink channel; transmit signaling including an indication of resources for sidelink communication based on the allocation; and receive an SCI on the physical sidelink channel based on the signaling, wherein a TBS for the SCI is determined based on the indication of resources for sidelink communication.

[0123] Another apparatus for wireless communication is described. The apparatus may include means for allocating resources for sidelink communication on a physical sidelink channel; transmitting signaling including an indication of the resources for sidelink communication based on the allocation; and receiving an SCI on the physical sidelink channel based on the signaling, wherein a TBS for the SCI is determined based on the indication of the resources for sidelink communication.

[0124] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: allocate resources for sidelink communication on a physical sidelink channel; transmit signaling including an indication of resources for sidelink communication based on the allocation; and receive an SCI on the physical sidelink channel based on the signaling, wherein a TBS for the SCI is determined based on the indication of resources for sidelink communication.

[0125] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: transmitting signaling including an indication of an overhead value, wherein the estimated number of REs associated with a PRB for sidelink communication can be based on the signaled overhead value.

[0126] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting signaling may include operations, features, devices, or instructions for the following actions: transmitting signaling including an indication of the number of code elements to be used for TBS determination, wherein the TBS may be based on the number of code elements to be used for TBS determination.

[0127] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the physical sidelink channel includes a PSSCH.

[0128] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the physical sidelink channel includes a PSCCH. BRIEF DESCRIPTION OF THE DRAWINGS

[0130] Figure 1 and 2 An example of a wireless communication system supporting sidelink communications in accordance with one or more aspects of the present disclosure is illustrated.

[0131] Figures 3 to 6 An example of a block diagram supporting sidelink communications in accordance with one or more aspects of the present disclosure is illustrated.

[0132] Figure 7 A block diagram of a UE communications manager supporting sidelink communications according to one or more aspects of the present disclosure is shown.

[0133] Figure 8 A diagram of a system including a device supporting sidelink communications is shown in accordance with one or more aspects of the present disclosure.

[0134] Fig. 9 and 10 A block diagram of a device supporting sidelink communications according to one or more aspects of the present disclosure is shown.

[0135] Fig.11 A block diagram of a base station communications manager supporting sidelink communications according to one or more aspects of the present disclosure is shown.

[0136] Fig.12 A diagram of a system including a device supporting sidelink communications is shown in accordance with one or more aspects of the present disclosure.

[0137] Figures 13 to 19 A flow chart illustrating a method of supporting sidelink communications in accordance with one or more aspects of the present disclosure is shown.

[0138] Detailed Description

[0139] A wireless communication system may include multiple communication devices, such as UEs and base stations (which may provide wireless communication services to UEs). For example, such base stations may be next-generation B nodes or gigabit B nodes (any of which may be referred to as gNBs) that may support multiple radio access technologies, including 4G systems (such as LTE systems) and 5G systems (which may be referred to as NR systems). Some wireless communication systems may also provide direct communication between multiple UEs. Examples of direct communication may include, but are not limited to, D2D communication, vehicle-based communication (which may also be referred to as V2X communication systems, V2V communication systems, etc.). In the example of a V2X communication system or a V2V communication system, a vehicle may convey SCI and sidelink data to indicate information related to these other vehicles to other vehicles. For example, a UE may indicate to other UEs in a V2X or V2V system the resources occupied by the UE in time and frequency. In some cases, due to changes in the time and frequency resources of the communication system and other factors, UEs (e.g., vehicles) in these communication systems may not be able to effectively convey SCI or sidelink data or both.

[0140] As the demand for communication efficiency increases, in some wireless communication systems, it may be desirable to provide satisfactory direct communication, and as a result, support high reliability or low latency direct communication, etc. The described technology can be used to configure a UE to determine the TBS and sidelink data for SCI in a wireless communication system that supports direct communication (such as in a V2X communication system, a V2V communication system, etc.). For example, various aspects of the described technology relate to configuring a UE to determine a TBS for direct communication (such as a sidelink communication), and such a system can benefit from an improved technology for TBS determination for sidelink communication, which can provide flexible TBS determination under several conditions or in several situations as described herein. For example, a vehicle in a V2X communication system can determine the TBS to be used to transmit an SCI message (e.g., SCI-1, SCI-2) to other vehicles on the PSCCH or PSSCH or both under several conditions or in several situations, where the TBS can be the same for initial transmission and retransmission of the same transmission block.

[0141] For example, various aspects of the described technology involve configuring one or more UEs to determine a TBS for sidelink communications when a demodulation reference signal (DMRS) pattern is dynamically indicated. In some other examples, various aspects of the described technology involve configuring one or more UEs to determine a TBS for sidelink communications depending on the presence or absence of a physical sidelink feedback channel (PSFCH). In other examples, various aspects of the described technology involve configuring one or more UEs to determine a TBS for sidelink communications depending on a second stage control (SCI-2) (e.g., based on a modulation and coding scheme (MCS) and a scaling factor). In some other examples, various aspects of the described technology involve configuring one or more UEs to determine a TBS for sidelink communications depending on a CSI-RS. In other words, various aspects of the described technology can take into account the changing conditions under which the UE can transmit sidelink information, and the flexible determination of the TBS can enhance reliability under such conditions.

[0142] In some examples, the TBS for sidelink communications can be determined based on an overhead of a physical sidelink channel. For example, the TBS can be determined based on an overhead associated with a physical sidelink control channel (PSCCH) or a physical sidelink shared channel (PSSCH) (e.g., resource elements dedicated to control, signaling, or synchronization tasks at the physical layer, etc.). For example, the TBS can be determined based on the overhead of the PSCCH on a per-PRB basis or, as another example, on a per-slot basis.

[0143] Certain aspects of the subject matter described in the present disclosure may be implemented to achieve one or more of the following potential advantages, among other things. The techniques employed by the UE may provide benefits and enhancements to the operation of the UE. For example, the operations performed by the UE may provide improvements to sidelink operations. In some examples, configuring the UE to support TBS determination for sidelink communications may support improvements to power consumption, spectral efficiency, higher data rates, and in some examples, may promote enhanced efficiency for sidelink communication operations and other benefits.

[0144] Aspects of the present disclosure are initially described in the context of a wireless communication system. Aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to TBS determination for sidelink communications.

[0145] Figure 1An example of a wireless communication system 100 supporting sidelink communication according to one or more 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 a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0146] 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.

[0147] 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 .

[0148] 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. 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 terms.

[0149] 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.

[0150] The UE 115 described herein may be able to communicate 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 .

[0151] 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.

[0152] 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).

[0153] 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).

[0154] 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 the carrier bandwidths in 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 the carrier bandwidth.

[0155] 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 discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM techniques, an RE may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier (e.g., with a PRB), wherein the symbol period and the subcarrier spacing are inversely related, and the PRB may include or be composed of multiple REs. The number of bits carried by each RE may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Thus, the more REs received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate of the 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 may further improve the data rate or data integrity of the communication with the UE 115.

[0156] One or more parameter designs for a carrier may be supported, where the parameter designs may include a subcarrier spacing (Δf) 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. The time interval of a base station 105 or a UE 115 may be expressed in multiples of a basic time unit, which may refer to, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the maximum supported subcarrier spacing, and N fThe maximum supported discrete Fourier transform (DFT) size may be indicated. 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).

[0157] 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 subcarrier spacing. 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, a 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 contain one or more (e.g., N f ) sampling period. The duration of a symbol period may depend on the subcarrier spacing or the operating band. A subframe, a time slot, a mini-time slot, or a 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)).

[0158] 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 .

[0159] 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.

[0160] A macro cell 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 a UE 115 that has a service subscription with a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user 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. 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.

[0161] In some examples, base stations 105 may be mobile and thus 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.

[0162] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time in some examples. The techniques described herein may be used for synchronous or asynchronous operation.

[0163] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0164] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving deep sleep mode when not engaged in active communications, operating on a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a subcarrier or resource block (RB) set) within a carrier, within a guard band of a carrier, or outside a carrier.

[0165] 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.

[0166] 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, wherein 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.

[0167] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these communications. The vehicles may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information related to the V2X system. The UE 115 may identify an SCI for sidelink communications; determine a TBS for the SCI; and transmit the SCI on a physical sidelink channel based on the TBS. One or more of these operations may be performed by the UE communication manager 101, which may be as described with reference to Figures 5 to 8Examples of UE communication managers 515, 615, 705, or 810 are described. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (such as a roadside unit), or with a network, or both, via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communications.

[0168] 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.

[0169] 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).

[0170] The wireless communication system 100 may operate using one or more frequency bands in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). 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. Transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0171] 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 extremely high frequency (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 millimeter wave (mmW) communications between UE 115 and base station 105, and the EHF antenna of the corresponding device may be smaller and more closely spaced than the UHF antenna. 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 adopted across transmissions using one or more different frequency zones, and the use of frequency bands specified across these frequency zones may vary by country or regulatory agency.

[0172] 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.

[0173] 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).

[0174] 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 therefore can effectively extend the features of FR1 and / or FR2 to mid-band frequencies. In addition, 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.

[0175] In view of the above aspects, unless otherwise specifically stated, it should be understood that if used in this document, the term "sub-6 GHz" and the like can broadly refer to 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 document, the term "millimeter wave" and the like can broadly refer to frequencies that can include mid-band frequencies, can be within FR2, FR4, FR4-a or FR4-1 and / or FR5, or can be within the EHF band.

[0176] 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.

[0177] 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.

[0178] 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).

[0179] The base station 105 or the UE 115 may use beam sweeping techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions. For example, the base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device (such as the base station 105) or a receiving device (such as the UE 115)) to identify a beam direction used by the base station 105 for later transmission or reception.

[0180] Some signals, such as data signals associated with a particular recipient device, may be transmitted by base station 105 in a single beam direction, e.g., a direction associated with a recipient device, such as UE 115. In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0181] 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 uncoded (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).

[0182] 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).

[0183] 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. At the physical layer, transport channels may be mapped to physical channels.

[0184] 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 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.

[0185] Figure 2 An example of a wireless communication system 200 that supports sidelink communications according to one or more aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 may include multiple UEs (such as UE 115-a and UE 115-b), which may be referenced Figure 1 Examples of corresponding devices described. In some examples, the wireless communication system 200 may support multiple radio access technologies, including 4G systems (such as LTE systems, LTE-A systems, or LTE-A Pro systems), and 5G systems (which may be referred to as NR systems). The wireless communication system 200 may support improvements in power consumption, spectrum efficiency, higher data rates, and in some examples may promote enhanced efficiency for high reliability and low latency direct communication operations and other benefits.

[0186] In some examples, the wireless communication system 200 can support direct communication between multiple UEs (such as UE 115-a and UE 115-b). For example, UE 115-a can be able to communicate directly with UE 115-b (e.g., other UEs) on a D2D communication link 205 (e.g., using a P2P or D2D protocol). In some examples, the D2D communication link 205 can be an example of a communication channel (such as a sidelink communication channel) between a vehicle (e.g., UE 115). The sidelink communication channel can correspond to a PC5 interface between UE 115-a and UE 115-b. The PC5 interface can facilitate direct communication between at least two UEs without involving network infrastructure (e.g., a base station (e.g., an eNB, a next-generation B node, or a Gigabit B node (any of which can be referred to as a gNB)), etc.). The PC5 interface can also be a one-to-many communication interface (i.e., can be designated for group communication).

[0187] In some examples, multiple vehicles (e.g., UE 115-a, UE 115-b) may communicate using V2X communications, V2V communications, or some combination of these communications. Vehicles may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information related to the V2X communication system. For example, UE 115-a may signal SCI and sidelink data related to the V2X communication system to UE 115-b using one or more physical sidelink channels. Examples of physical sidelink channels may include PSCCH and PSSCH. In some examples, vehicles in a V2X communication system may communicate with roadside infrastructure (such as a roadside unit), or with a network, or both, using vehicle-to-network (V2N) communications via one or more network nodes (e.g., base station 105). Reference Figure 3 An example of a physical layer structure for direct communication such as sidelink communication is described.

[0188] Figure 3 An example of a block diagram 300 for supporting sidelink communication according to one or more aspects of the present disclosure is illustrated. The block diagram 300 may implement Figure 1 and 2 Aspects of the described wireless communication systems 100 and 200. For example, block diagram 300 may be based on configuration performed by UE 115 and implemented by UE 115. Figure 3 In the example illustrated in FIG. 3 , the block diagram 300 may be applicable to implementations or instances when the UE 115 is configured with direct communication operations (such as sidelink communication operations in V2X and V2V communication systems). For example, the block diagram 300 may include a PSCCH 305 and a PSSCH 310, which may correspond to time resources (e.g., symbols, mini-slots, slots, subframes, frames) and frequency resources (e.g., subcarriers, carriers). In some examples, the PSCCH 305 may correspond to a number of symbols in the time domain, e.g., two or three symbols. Similarly, the PSSCH 310 may correspond to a number of symbols in the time domain.

[0189] PSCCH 305 may be associated with PSSCH 310. In some examples, PSCCH 305 and PSSCH 310 may be frequency-division multiplexed and transmitted (and / or received) in the same time resource (e.g., time slot). In some other examples, PSCCH 305 and PSSCH 310 may be time-division multiplexed and transmitted (and / or received) in the same frequency resource (e.g., subchannel). Figure 2In the example of direct communication, the vehicles may communicate using V2X communication, V2V communication, or some combination of these communications based on the time and frequency resources of a resource pool (also referred to as a sidelink resource pool). The resource pool may be divided on one or more of the time resources or the frequency resources for direct communication (e.g., such as sidelink communication) between UE 115-a and UE 115-b. The time resources of the resource pool may be divided into time slots, and the frequency resources of the resource pool may be divided into sub-channels.

[0190] exist Figure 3 In the example illustrated in , PSCCH 305 can span a single subchannel 315, while PSSCH 310 can span multiple subchannels 315. Subchannel 315 can occupy multiple physical resource blocks (PRBs). For example, subchannel 315 can occupy 10 PRBs, 15 PRBs, 20 PRBs, 25 PRBs, 50 PRBs, 75 PRBs, or 100 PRBs. PSCCH 305 can also occupy several PRBs. For example, PSCCH 305 can occupy 10 PRBs, 12 PRBs, 15 PRBs, 20 PRBs, or 25 PRBs. When PSCCH 305 and subchannel 315 occupy the same number of PRBs, and PSCCH 305 spans a single subchannel 315, PSCCH 305 and PSSCH 310 can be time-division multiplexed.

[0191] return Figure 2In some examples, a vehicle in a V2X communication system (e.g., UE 115-a) may communicate sidelink information (such as SCI), which may carry information (e.g., information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X communication system) that other vehicles (e.g., UE 115-b) may use to receive sidelink data from the vehicle. For example, a vehicle in a V2X communication system (e.g., UE 115-a) may transmit (or receive) an SCI message on a PSCCH, and the SCI message may include information about resource allocations for a PSSCH carrying sidelink data. In some examples, the transmission of the SCI may include multiple stages. For example, a vehicle in a V2X communication system (e.g., UE 115-a) may transmit (or receive) a first SCI (SCI-1) to another vehicle (e.g., UE 115-b) on a PSCCH and transmit (or receive) a second SCI (SCI-2) to the other vehicle on a PSSCH. In some examples, a vehicle (e.g., UE 115-a) in a V2X communication system may map contiguous RBs of SCI-2 in the frequency domain before mapping contiguous RBs of SCI-2 in the time domain. PSSCH may be mapped to one or two layers (e.g., higher layers, physical layer, V2X layer). When PSCCH is mapped to two layers, the codewords of SCI-2 may be repeated across the two layers.

[0192] A vehicle (e.g., UE 115-a) in a V2X communication system may communicate SCI to other vehicles (e.g., UE 115-b) based on a DMRS pattern. In some examples, a DMRS pattern may span two, three, or four symbols. In other words, there may be a DMRS pattern of two, three, or four symbols. A vehicle (e.g., UE 115-a) may signal the DMRS pattern in the SCI to other vehicles (e.g., UE 115-b). Other vehicles (e.g., UE 115-b) may use the DMRS of the DMRS pattern as a reference for channel estimation and demodulation of the PSSCH. In some examples, a vehicle in a V2X communication system may support transmission (retransmission) of sidelink data to increase the likelihood that the sidelink data is successfully received. HARQ feedback may be a technique for increasing the likelihood of correctly receiving sidelink data on a D2D communication link 205. HARQ may include a combination of error detection (e.g., using CRC), FEC, and transmission (retransmission) (e.g., ARQ). In some examples, vehicles in a V2X communication system may provide HARQ feedback via a physical feedback channel. For example, the physical feedback channel may be a PSFCH. Figure 4 An example of a physical layer structure for direct communication such as sidelink communication is described.

[0193] Figure 4 An example of a block diagram 400 for supporting sidelink communications according to one or more aspects of the present disclosure is illustrated. The block diagram 400 may be implemented with reference to Figure 1 and 2 Aspects of the described wireless communication systems 100 and 200. For example, block diagram 400 may be based on configuration performed by UE 115 and implemented by UE 115. Figure 4 In the example illustrated in , the block diagram 400 may be applicable to implementations or instances when the UE 115 is configured with direct communication operations (such as sidelink communication operations in V2X and V2V communication systems). For example, the block diagram 400 may include a PSCCH 405 and a PSSCH 410, which may correspond to time resources (e.g., symbols, mini-slots, slots, subframes, frames) and frequency resources (e.g., subcarriers, carriers). Figure 4 In the example illustrated in , the PSCCH 405 may span a single subchannel 415, while the PSSCH 410 may span multiple subchannels 415. A subchannel 415 may occupy several PRBs.

[0194] Similarly, in Figure 4 In the example illustrated in , PSFCH 420 may correspond to time resources (e.g., symbols, mini-slots, slots, subframes, frames) and frequency resources (e.g., subcarriers, carriers). In some examples, PSFCH 420 may span one, two, or four symbols. For example, PSFCH 420 may span two symbols. A slot with PSFCH may have fewer symbols (e.g., three fewer symbols) for PSSCH than a slot without PSFCH. In other words, when PSFCH occupies at least one symbol of a slot, PSSCH may occupy fewer symbols of a slot. In some examples, gap symbols 425 may separate PSSCH 410 and PSFCH 420 in some examples.

[0195] return Figure 2In some examples, a vehicle in a V2X communication system (e.g., UE 115-a) may communicate a channel state information (CSI) report on a D2D communication link 205. In some examples, a vehicle in the V2X communication system (e.g., UE 115-a) may trigger a CSI report in an SCI message. Another vehicle in the V2X communication system (e.g., UE 115-b) may transmit a CSI reference signal (CSI-RS) exclusively when the transmitting vehicle (e.g., UE 115-a) triggers a CSI report via an SCI message. In some examples, the other vehicle (e.g., UE 115-b) may transmit the CSI-RS in a unicast sidelink transmission on the D2D communication link 205. The time and frequency resources associated with the CSI-RS may correspond to the PSSCH bandwidth.

[0196] As the demand for communication efficiency increases, some wireless communication systems may not be able to provide satisfactory direct communication, and as a result may not be able to support high reliability or low latency direct communication, etc. Various aspects of the described technology are related to configuring one or more of UE 115-a and UE 115-b to support high reliability or low latency direct communication in a wireless communication system 200. The described technology can be used to configure one or more of UE 115-a and UE 115-b to determine a TBS 215 of a transmission block 210 (e.g., transmission block 210-a, transmission block 210-b) for direct communication (such as sidelink communication). In some examples, the TBS may include a number of bits for transmitting data on the D2D communication link 205. For example, a vehicle (e.g., UE 115-a) in a V2X communication system can determine a TBS 215 to transmit (or receive) an SCI message to other vehicles (e.g., UE 115-b) via the D2D communication link 205 on the PSCCH. The TBS 215 may be the same for initial transmission and retransmission of the same transport block.

[0197] In some examples, various aspects of the described techniques involve configuring one or more of UE 115-a and UE 115-b to determine a TBS 215 for sidelink communications when a DMRS pattern is dynamically indicated. In some other examples, various aspects of the described techniques involve configuring one or more of UE 115-a and UE 115-b to determine a TBS 215 for sidelink communications depending on the presence or absence of a PSFCH. In other examples, various aspects of the described techniques involve configuring one or more of UE 115-a and UE 115-b to determine a TBS 215 for sidelink communications depending on a second stage control (SCI-2) (e.g., based on a modulation and coding scheme (MCS) and a scaling factor). In some other examples, various aspects of the described techniques involve configuring one or more of UE 115-a and UE 115-b to determine a TBS 215 for sidelink communications depending on a CSI-RS.

[0198] In some cases, to determine the TBS, UE 115-a may determine an estimated number N′ of REs within a PRB. RE .

[0199] For example, UE 115-a may determine the estimated number N′ of REs within a PRB according to equation (1): RE .

[0200]

[0201] is the number of subcarriers within a PRB, is the number of symbols allocated for a physical channel (e.g., Physical Shared Data Channel (PSDCH)), is the number of REs used for DMRS per PRB, and is the overhead associated with the PRB. In some examples, It can be configured as 0 RE, 6 RE, 12 RE or 18 RE. In some cases, in order to determine the TBS, UE 115-a can determine the number of REs N in the time slot according to equation (2): RE .

[0202] N RE =min(156,N′ RE )·n PRB (2)

[0203] UE 115-a may determine the number of PRBs n allocated for UE 115-a. PRB(the total number of PRBs allocated to the UE for sidelink communications, where the PRBs are allocated by another device in the wireless communication system), and UE 115-a may use the value N′ determined from equation (1) RE To determine the number of REs N in a time slot RE As a result, UE 115-a may use the determined number of REs N RE To determine TBS.

[0204] In some examples, UE 115-a may identify an SCI for sidelink communications, as described herein. For example, UE 115-a may identify an SCI for sidelink communications with UE 115-b. Prior to transmitting (or receiving) the SCI on a physical sidelink channel, UE 115-a may determine a TBS for the SCI. UE 115-a may determine an estimated number of REs (N′) associated with a PRB for sidelink communications. RE In some examples, UE 115 - a may determine an estimated number of REs (N′) associated with a PRB for sidelink communication, for example, according to equation (1). RE UE 115-a may also determine the number of PRBs (n) allocated for sidelink communications. PRB ), and for example according to equation (2) based on the number of allocated PRBs (n PRB ) to determine the number of REs (N) associated with the PRB used for sidelink communication RE ) (e.g., the number of REs in a timeslot).

[0205] According to various aspects of the described techniques, UE 115-a may determine the number of REs used for a first SCI (e.g., first stage SCI-1 overhead) and from an estimated number of REs associated with a PRB (N′ RE ) or the number of REs associated with a PRB (N RE ) or both minus the number of REs used for the first SCI. In some examples, UE 115 - a may determine the control overhead associated with the first SCI and suppress the estimated number of REs associated with the PRB (N′) RE ) or the number of REs associated with a PRB (N′ RE ) or both. In this way, the first stage control overhead may not be considered for TBS calculation.

[0206] In some examples, UE 115-a can determine that a first physical side link channel (e.g., PSCCH) and a second physical side link channel (e.g., PSSCH) are frequency division multiplexed. UE 115-a can determine that the PSSCH occupies a number of REs associated with a PRB, and adjust the overhead of the PSCCH based on the value of the REs occupied by the PSSCH. In other words, the PSCCH overhead per PRB can be scaled by a portion of the REs in the codeword occupied by the PSCCH. The PSCCH overhead can be considered on a slot-by-slot basis.

[0207] In some other examples, UE 115-a may determine that a first physical side link channel (e.g., PSCCH) and a second physical side link channel (e.g., PSSCH) are time division multiplexed. UE 115-a may determine the overhead of the PSCCH per PRB based on the first side link channel and the second physical side link channel being time division multiplexed. Thus, the PSCCH overhead may be considered on a PRB-by-PRB basis. Alternatively, the PSCCH overhead may be considered on a slot-by-slot basis. UE 115-a may determine the number of symbols associated with the PSCCH. or the number of symbols associated with the PSSCH, or both, and determines the number of symbols that exclusively include the PSCCH. The UE 115-a may determine the number of symbols that exclusively include the PSCCH from the estimated number of REs associated with the PRB (N′). RE ) or the number of REs associated with a PRB (N RE ) or both, excluding the number of symbols that exclusively include PSCCH. In other words, the number of PSSCH symbols excludes those symbols that only include PSCCH. For example, UE 115-a may determine the estimated number of REs associated with a PRB (N′) according to equation (3). RE ).

[0208]

[0209] According to various aspects of the described techniques, UE 115-a may determine the number of REs for a second SCI (e.g., second stage SCI-2 overhead) and from an estimated number of REs associated with a PRB (N′ RE ) or the number of REs associated with a PRB (N RE) or both minus the number of REs used for the second SCI. UE 115-a can determine the control overhead associated with the second SCI based on the target code rate associated with the MCS. Therefore, the SCI-2 overhead can be calculated using the target code rate from the MCS (instead of the actual TBS). UE 115a can ignore the control overhead associated with the second SCI. In other words, the overhead associated with the second SCI (e.g., SCI-2 overhead) is not considered for the TBS calculation. In some examples, UE 115-a can identify the MCS for the second SCI and identify the target code rate based on the MCS for the second SCI. UE 115-a can determine the number of REs used for the second stage of control (e.g., SCI-2) using the target code rate from the MCS (instead of the actual TBS).

[0210] In some examples, in accordance with various aspects of the described techniques, UE 115-a may receive signaling including an indication of an overhead value (Z), which UE 115-a may use to determine a TBS for sidelink communications. In some examples, the overhead value (Z) may be a total overhead value, and UE 115-a may determine an estimated number of REs associated with a PRB (N′) according to equation (4). RE ).

[0211]

[0212] Alternatively, the overhead value (Z) may be an offset overhead value relative to the DMRS pattern. In some examples, the overhead value (Z) may be a total overhead value, and the UE 115-a may determine the estimated number of REs associated with the PRB (N′) according to equation (5). RE ).

[0213]

[0214] According to various aspects of the described techniques, UE 115-a may receive signaling including an indication of a number of symbols (Y) to be used for TBS determination. In some examples, the number of symbols (Y) may be an offset of the number of symbols relative to the number of symbols available for PSSCH. For example, UE 115-a may determine an estimated number of REs associated with a PRB (N′) according to equation (6). RE ).

[0215]

[0216] Alternatively, the number of symbols (Y) may be the total number of symbols to be used for TBS determination. Thus, UE 115-a may determine the estimated number of REs associated with a PRB (N′) according to equation (7). RE ).

[0217]

[0218] In some examples, a single field in a message may be used to signal one or more of the overhead value (Z) and the number of symbols (Y) (eg, jointly encoded or indexed into a set of values).

[0219] According to various aspects of the described technology, UE 115-a may determine the overhead of the PSFCH based on the period of the PSFCH. UE 115-a may scale the overhead of the PSFCH based on the period of the PSFCH. In this way, the overhead of the PSFCH may be scaled depending on the value of the PSFCH period. Alternatively, UE 115-a may determine the average value of the overhead of the PSFCH over the period of the PSFCH. Therefore, the overhead of the PSFCH may be adopted as the average value over the PSFCH period. UE 115-a may apply the overhead of the PSFCH as a value per PRB. Alternatively, UE 115-a may apply the overhead of the PSFCH as a change in the number of available PSSCH symbols.

[0220] In some examples, UE 115-a may set the number of REs (N) associated with a PRB for sidelink communication in accordance with various aspects of the described techniques. RE ) to the number of REs associated with the PRBs used for non-sidelink communications (Uu). For example, UE 115-a may adjust the number of REs associated with the PRBs used for sidelink communications (N RE ) is rounded to the nearest RE number associated with a PRB for non-sidelink communication (Uu). Alternatively, UE 115-a may round the RE number associated with a PRB for sidelink communication (N RE ) is rounded to a lower or upper bound value associated with the number of REs associated with PRBs used for non-sidelink communication (Uu).

[0221] In some examples, UE 115-a may also determine CSI-RS overhead and suppress the estimated number of REs associated with a PRB (N′) in determining the CSI-RS overhead according to various aspects of the described techniques. RE ) or determine the number of REs associated with a PRB (N RE ) or both. In other words, the CSI-RS overhead is not taken into account in the determination of the TBS for sidelink communication. Upon determining the TBS for SCI based on one or more of the above aspects, UE 115-a can transmit (or receive) the SCI to UE 115-b on a physical sidelink channel (e.g., PSCCH, PSSCH).

[0222] For example, operations performed by the UE 115 may provide improvements to direct communication operations related to sidelink communications in the wireless communication system 200. Furthermore, operations performed by the UE 115 may provide benefits and enhancements to the operations of the UE 115. For example, by supporting TBS determination operations for sidelink communications, the UE 115 may save power while supporting higher reliability and lower latency sidelink communications, thereby resulting in enhanced power efficiency and network throughput in the wireless communication system 200.

[0223] Figure 5 A block diagram 500 of a device 505 supporting sidelink communications according to one or more aspects of the present disclosure is shown. The device 505 may be an example of aspects of a device 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).

[0224] 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 TBS determination for sidelink communication, 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 transceiver 820 are described. The receiver 510 may utilize a single antenna or a collection of antennas.

[0225] The UE communication manager 515 may identify sidelink information for sidelink communication; determine a TBS for the sidelink information based on an overhead of a second physical sidelink channel for communicating the sidelink information; encode the sidelink information for the sidelink communication based on the TBS; and transmit the encoded sidelink information on the physical sidelink channel. The UE communication manager 515 may also identify sidelink information for sidelink communication; determine a TBS for the sidelink information based on an overhead of a second physical sidelink channel for communicating the sidelink information; decode the sidelink information for the sidelink communication based on the TBS; and receive the decoded sidelink information on the physical sidelink channel. The UE communication manager 515 may be an example of aspects of the UE communication manager 810 described herein.

[0226] The UE communication manager 515 as described herein may be implemented to achieve one or more potential advantages. One implementation may allow the device 505 to communicate with the base station 105 (e.g., Figure 1505) to communicate to save power and extend battery life. For example, when the resources used for TBS determination change in a wireless communication system (such as a V2X system), the device 505 can reduce the number of retransmissions associated with the sidelink communication. In addition, the device 505 can experience reduced complexity and better throughput through efficient TBS determination for sidelink communication. Another implementation can facilitate higher reliability and lower latency communication at the device 505 due to the TBS determination flexibility of the device 505 (as a result of supporting TBS determination for sidelink communication).

[0227] The UE communication manager 515 or its subcomponents may be implemented in hardware, code executed by a processor (e.g., 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, application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0228] 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).

[0229] The UE communication manager 515 may be an example of a means for performing various aspects of TBS determination for sidelink communication 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), 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 in the present disclosure.

[0230] 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.

[0231] In some examples, the UE communications manager 515 may be configured to perform various operations (e.g., receive, determine, transmit, subtract, ignore, identify, scale, exclude, adjust, suppress, apply, allocate) using the receiver 510, the transmitter 520, or both, or otherwise collaborate with the receiver 510, the transmitter 520, or both.

[0232] 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 component. For example, the transmitter 520 may be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0233] Figure 6 A block diagram 600 of a device 605 supporting sidelink communications according to one or more 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 645. 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).

[0234] 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 TBS determination for sidelink communication, 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 transceiver 820 are described. The receiver 610 may utilize a single antenna or a collection of antennas.

[0235] UE communication manager 615 may be an example of aspects of UE communication manager 515 as described herein. UE communication manager 615 may include control component 620, transport block component 625, side link component 630, resource component 635, and signaling component 640. UE communication manager 615 may be an example of aspects of UE communication manager 810 described herein.

[0236] The control component 620 may identify the sidelink information for the sidelink communication. The transport block component 625 may determine the TBS for the sidelink information based on the overhead of the second physical sidelink channel for conveying the sidelink information. The control component 620 may encode the sidelink information for the sidelink communication based on the TBS. The sidelink component 630 may transmit the encoded sidelink information on the physical sidelink channel. The resource component 635 may allocate resources for the sidelink communication on the physical sidelink channel. The signaling component 640 may transmit signaling including an indication of the resources for the sidelink communication based on the allocation. The sidelink component 630 may receive SCI on the physical sidelink channel based on the signaling, wherein the TBS for the SCI is determined based on the indication of the resources for the sidelink communication. The control component 620 may identify the sidelink information for the sidelink communication. The transport block component 625 may determine the TBS for the sidelink information based on the overhead of the second physical sidelink channel for conveying the sidelink information. The control component 620 may decode the sidelink information for the sidelink communication based on the TBS. The sidelink component 630 may receive the decoded sidelink information on the physical sidelink channel.

[0237] The transmitter 645 can transmit signals generated by other components of the device 605. In some examples, the transmitter 645 can be co-located with the receiver 610 in a transceiver component. For example, the transmitter 645 can be a reference Figure 8 Examples of various aspects of the transceiver 820 are described. The transmitter 645 may utilize a single antenna or a collection of antennas.

[0238] Figure 7 A block diagram 700 of a UE communication manager 705 supporting sidelink communications according to one or more 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 control component 710, a transport block component 715, a sidelink component 720, a multiplexing component 725, a scaling component 730, a resource component 735, and a signaling component 740. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0239] The control component 710 may identify side link information for side link communication. The control component 710 may encode (or decode) the side link information for side link communication based on the TBS. In some examples, the control component 710 may determine the control overhead associated with the first SCI. In some examples, the control component 710 may suppress the use of control overhead in the estimated number of REs associated with the PRB or the number of REs associated with the allocated PRB, or both, wherein the determination of the TBS may be based on the suppression. In some examples, the control component 710 may determine the overhead of the PSCCH per PRB based on determining that the first physical side link channel and the second physical side link channel are time-division multiplexed, wherein the determination of the TBS may be based on the overhead of the PSCCH being PRB-by-PRB.

[0240] In some examples, the control component 710 may determine a control overhead associated with the second SCI based on a target code rate associated with the MCS, wherein determining the TBS may be based on the control overhead associated with the second SCI. In some examples, the control component 710 may ignore the control overhead associated with the second SCI, wherein determining the TBS may be based on ignoring the control overhead associated with the second SCI. In some examples, the control component 710 may identify the MCS for sidelink communication. In some examples, the control component 710 may identify a target code rate based on the MCS for sidelink communication, wherein determining the number of REs for the second SCI may be based on the target code rate.

[0241] In some examples, the control component 710 may determine a CSI-RS overhead. In some examples, the control component 710 may suppress the use of the CSI-RS overhead for determining an estimated number of REs associated with a PRB or determining a number of REs associated with an allocated PRB, or both, wherein determining the TBS may be based on the omission. In some examples, the control component 710 may determine a number of subcarriers associated with a PRB, wherein determining an estimated number of REs associated with a PRB may be based on the number of subcarriers associated with the PRB. In some examples, the control component 710 may determine an allocated number of symbols associated with a physical side link channel, wherein determining an estimated number of REs associated with a PRB may be based on one or more of the number of subcarriers associated with the PRB and the number of allocated symbols associated with the physical side link channel.

[0242] In some examples, the control component 710 may determine a DMRS overhead associated with the PRB, wherein determining an estimated number of REs associated with the PRB may be based on a DMRS signal overhead associated with the PRB. In some examples, the control component 710 may determine a control overhead associated with the PRB, wherein determining an estimated number of REs associated with the PRB may be based on the control overhead associated with the PRB. In some examples, the control component 710 may determine an overhead of a physical side link channel based on a period of the physical side link channel, wherein determining the TBS is based on the overhead of the physical side link channel.

[0243] In some examples, the control component 710 may scale the overhead of the physical side link channel based on the period of the physical side link channel, wherein the determination of the TBS is based on the scaling. In some examples, the control component 710 may determine an average value of the overhead of the physical side link channel over the period of the physical side link channel, wherein the determination of the TBS is based on the average value of the overhead of the physical side link channel over the period of the physical side link channel. In some examples, the control component 710 may apply the overhead of the physical side link channel as a value per PRB, wherein the determination of the TBS is based on the application. In some cases, the physical side link channel includes a PSFCH. In some cases, the overhead of the physical side link channel corresponds to the number of available symbols of a second physical side link channel, and the second physical side link channel includes a PSSCH.

[0244] The transport block component 715 may determine the TBS for the sidelink information based on the overhead of the second physical sidelink channel used to convey the sidelink information. In some examples, the transport block component 715 may determine an estimated number of REs associated with the PRBs used for sidelink communication, wherein the determination of the TBS is based on the estimated number of REs associated with the PRBs. In some examples, the transport block component 715 may determine the number of PRBs allocated for sidelink communication. In some examples, the transport block component 715 may determine the number of REs associated with the PRBs allocated for sidelink communication based on the number of allocated PRBs or the estimated number of REs associated with the PRBs, or both, wherein the determination of the TBS is based on the number of REs associated with the PRBs allocated for sidelink communication.

[0245] In some examples, the transport block component 715 may determine the number of REs used for the first SCI. In some examples, the transport block component 715 may subtract the number of REs used for the first SCI from the number of REs associated with the PRB, wherein determining the TBS may be based on the subtraction. In some examples, the transport block component 715 may determine the TBS based on the overhead of the PSCCH per time slot. In some examples, the transport block component 715 may determine the TBS based on the overhead of the PSCCH per time slot. In some examples, the transport block component 715 may adjust the number of REs associated with the PRBs allocated for sidelink communication to the number of REs associated with the PRBs allocated for non-sidelink communication.

[0246] The side link component 720 may transmit (or receive) encoded (or decoded) side link information on a physical side link channel. In some examples, the side link component 720 may receive the side link information on the physical side link channel based on the signaling, wherein the TBS for the side link information is determined based on an indication of resources for side link communication. In some examples, the side link component 720 may transmit (or receive) a first SCI on the PSCCH based on the TBS. In some examples, the side link component 720 may transmit (or receive) a second SCI on the PSCCH based on the TBS. In some cases, the physical side link channel includes the PSSCH. In some cases, the physical side link channel includes the PSCCH.

[0247] Resource component 735 may allocate resources for sidelink communications on a physical sidelink channel. In some examples, resource component 735 may determine the number of symbols associated with the PSCCH or the PSSCH or both. In some examples, resource component 735 may determine the number of symbols that exclusively include the PSCCH. In some examples, resource component 735 may exclude the number of symbols that exclusively include the PSCCH from the estimated number of REs associated with the PRBs or the number of REs associated with the allocated PRBs or both, wherein determining the TBS is based on the exclusion.

[0248] In some examples, resource component 735 can determine the number of REs used for the second SCI. In some examples, resource component 735 can subtract the number of REs used for the second SCI from the estimated number of REs associated with the PRBs or the number of REs associated with the allocated PRBs, or both, wherein determining the TBS is based on the subtraction.

[0249] The signaling component 740 may transmit signaling including an indication of resources for sidelink communication based on the allocation. In some examples, the signaling component 740 may receive signaling including an indication of an overhead value, wherein determining an estimated number of REs associated with the PRB is based on the signaled overhead value. In some examples, the signaling component 740 may receive signaling including an indication of an offset overhead value relative to a demodulation reference signal pattern, wherein determining an estimated number of REs associated with the PRB is based on the signaled offset overhead value. In some examples, the signaling component 740 may receive signaling including an indication of a number of symbols to be used for TBS determination, wherein determining the TBS is based on the signaling.

[0250] In some examples, signaling component 740 can determine an allocated number of symbols associated with a physical side link channel, the physical side link channel comprising the PSCCH. In some examples, signaling component 740 can subtract the number of symbols to be used for TBS determination from the allocated number of symbols associated with the physical side link channel, wherein determining an estimated number of REs associated with the PRBs is based on the subtraction. In some examples, signaling component 740 can determine an estimated number of REs associated with the PRBs based on the number of symbols to be used for TBS determination.

[0251] In some examples, signaling component 740 may transmit signaling including an indication of an overhead value, wherein an estimated number of REs associated with a PRB for sidelink communication is based on the signaled overhead value. In some examples, signaling component 740 may transmit signaling including an indication of a number of symbols to be used for TBS determination, wherein the TBS is based on the number of symbols to be used for TBS determination.

[0252] The multiplexing module 725 can determine that the first physical side link channel and the second physical side link channel are frequency division multiplexed, the first physical side link channel includes a PSSCH, and the second physical side link channel includes a PSCCH, wherein determining the TBS is based on the first physical side link channel and the second physical side link channel being frequency division multiplexed. In some examples, the first physical side link channel and the second physical side link channel are determined to be time division multiplexed, the first physical side link channel includes a PSSCH, and the second physical side link channel includes a PSCCH, wherein determining the TBS is based on determining that the first physical side link channel and the second physical side link channel are time division multiplexed. The scaling component 730 can determine the number of REs that the PSSCH occupies associated with the allocated PRB. In some examples, the scaling component 730 can adjust the overhead of the PSCCH based at least in part on the value of the number of REs occupied by the PSSCH, wherein the overhead of the PSCCH is time slot by time slot.

[0253] Figure 8A diagram of a system 800 including a device 805 supporting sidelink communications according to one or more aspects of the present disclosure is shown. The device 805 may be an example of a device 505, a device 605, or a device as described herein or include components of these 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).

[0254] The UE communication manager 810 may identify sidelink information for sidelink communication; determine a TBS for the sidelink information based on an overhead of a second physical sidelink channel for communicating the sidelink information; encode the sidelink information for sidelink communication based on the TBS; and transmit the encoded sidelink information on the physical sidelink channel. The UE communication manager 810 may identify sidelink information for sidelink communication; determine a TBS for the sidelink information based on an overhead of a second physical sidelink channel for communicating the sidelink information; decode the sidelink information for sidelink communication based on the TBS; and receive the decoded sidelink information on the physical sidelink channel.

[0255] 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 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.

[0256] 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 the antenna. In some examples, the device 805 may include a single antenna 825. However, in some examples, the device 805 may have more than one antenna 825, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0257] 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.

[0258] 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.

[0259] The processor 840 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, the processor 840 may be configured to operate a 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) to cause the device 805 to perform various functions (e.g., various functions or tasks to support TBS determination for sidelink communication).

[0260] Fig. 9 A block diagram 900 of a device 905 supporting sidelink communications according to one or more 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 communications 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).

[0261] 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 TBS determination for sidelink communication, etc.). 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 transceiver 1220 are described. The receiver 910 may utilize a single antenna or a collection of antennas.

[0262] The base station communication manager 915 may allocate resources for sidelink communication on a physical sidelink channel; transmit signaling including an indication of the resources for sidelink communication based on the allocation; and receive an SCI on the physical sidelink channel based on the signaling, wherein a TBS for the SCI is determined based on the indication of the resources for sidelink communication. The base station communication manager 915 may be an example of aspects of the base station communication manager 1210 described herein.

[0263] The base station communication manager 915 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the base station communication manager 915 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0264] The base station communication manager 915 or its subcomponents may be physically located at various locations, including being distributed such that portions of 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, 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).

[0265] The base station communication manager 915 may be an example of a means for performing various aspects of TBS determination for sidelink communications. 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.

[0266] 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.

[0267] In some examples, base station communications manager 915 may be configured to perform various operations (eg, receive, determine, transmit, allocate, etc.) using or otherwise coordinating with receiver 910, transmitter 920, or both.

[0268] 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 transceiver 1220 are described. The transmitter 920 may utilize a single antenna or a collection of antennas.

[0269] Fig.10 A block diagram 1000 of a device 1005 supporting transmit sidelink communications according to one or more 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 communications manager 1015, and a transmitter 1035. 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).

[0270] 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 TBS determination for sidelink communication, etc.). 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 transceiver 1220 are described. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0271] Base station communications manager 1015 may be an example of aspects of base station communications manager 915 as described herein. Base station communications manager 1015 may include resource component 1020, signaling component 1025, and sidelink component 1030. Base station communications manager 1015 may be an example of aspects of base station communications manager 915 as described herein.

[0272] Resource component 1020 can allocate resources for sidelink communication on a physical sidelink channel. Signaling component 1025 can transmit signaling including an indication of the resources for sidelink communication based on the allocation. Sidelink component 1030 can receive SCI on the physical sidelink channel based on the signaling, wherein a TBS for the SCI is determined based on the indication of the resources for sidelink communication.

[0273] The transmitter 1035 can transmit signals generated by other components of the device 1005. In some examples, the transmitter 1035 can be co-located with the receiver 1010 in a transceiver module. For example, the transmitter 1035 can be a reference Fig.12 Examples of various aspects of the transceiver 1220 are described. The transmitter 1035 may utilize a single antenna or a collection of antennas.

[0274] Fig.11 A block diagram 1100 of a base station communication manager 1105 supporting sidelink communications according to one or more 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 915, the base station communication manager 1015, or the base station communication manager 1210 described herein. The base station communication manager 1105 can include a resource component 1110, a signaling component 1115, and a sidelink component 1120. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0275] Resource component 1110 may allocate resources for sidelink communication on a physical sidelink channel. Signaling component 1115 may transmit signaling including an indication of resources for sidelink communication based on the allocation. In some examples, signaling component 1115 may transmit signaling including an indication of an overhead value, wherein an estimated number of REs associated with a PRB for sidelink communication is based on the signaled overhead value. In some examples, signaling component 1115 may transmit signaling including an indication of the number of symbols to be used for TBS determination, wherein the TBS is based on the number of symbols to be used for TBS determination. Sidelink component 1120 may receive SCI on a physical sidelink channel based on the signaling, wherein the TBS for SCI is determined based on an indication of resources for sidelink communication. In some cases, the physical sidelink channel includes PSSCH. In some cases, the physical sidelink channel includes PSCCH.

[0276] Fig.12A diagram of a system 1200 including a device 1205 supporting sidelink communications according to one or more aspects of the present disclosure is shown. The device 1205 may be an example of a device 905, a device 1005, or a base station 105 as described herein or include components of the above devices. 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).

[0277] The base station communication manager 1210 may allocate resources for sidelink communications on a physical sidelink channel; transmit signaling including an indication of the resources for sidelink communications based on the allocation; and receive an SCI on the physical sidelink channel based on the signaling, wherein a TBS for the SCI is determined based on the indication of the resources for sidelink communications.

[0278] 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.

[0279] 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 the antenna. In some cases, the device 1205 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.

[0280] The memory 1230 may include RAM, ROM, or a combination thereof. The 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, the 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.

[0281] 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.

[0282] 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) to cause device 1205 to perform various functions (e.g., various functions or tasks to support TBS determination for sidelink communication).

[0283] 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 the 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.

[0284] Fig.13 1 is a flowchart illustrating a method 1300 for supporting sidelink communication according to one or more aspects of the present disclosure. The operations of the method 1300 may be implemented by a device or components thereof as described herein. For example, the operations of the method 1300 may be implemented by a device or components thereof as described herein. Figures 5 to 8 The UE communication manager described herein may be used to perform. In some examples, a device may execute an instruction set to control the functional elements of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform various aspects of the functions described herein.

[0285] At 1305, the device may identify side link information for side link communication. 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 with reference to Figures 5 to 8 The control components described are used to perform.

[0286] At 1310, the device may determine a TBS for the sidelink information based on an overhead of a second physical sidelink channel used to convey the sidelink information. 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 The described transport block components are performed.

[0287] At 1315, the device may encode sidelink information for sidelink communication based on the TBS. 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 control components described are used to perform.

[0288] At 1320, the device may transmit the encoded sidelink information on the physical sidelink channel. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed as described with reference to Figures 5 to 8 The described side link components are performed.

[0289] Fig.14 1400 is a flowchart illustrating a method 1400 for supporting sidelink communication according to one or more aspects of the present disclosure. The operations of the method 1400 may be implemented by a device or components thereof as described herein. For example, the operations of the method 1400 may be implemented by a device or components thereof as described herein. Figures 5 to 8 The UE communication manager described herein may be used to perform. In some examples, a device may execute an instruction set to control the functional elements of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform various aspects of the functions described herein.

[0290] At 1405, the device may identify side link information for side link communication. 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 with reference to Figures 5 to 8 The control components described are used to perform.

[0291] At 1410, the device may determine an estimated number of REs associated with a PRB for sidelink communication. 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 The described transport block components are performed.

[0292] At 1415, the device may determine a TBS for the SCI based on the estimated number of REs associated with the PRB. 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 8The described transport block components are performed.

[0293] At 1420, the device may encode side link information for the side link communication based on the TBS. 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 control components described are used to perform.

[0294] At 1425, the device may transmit the encoded sidelink information on the physical sidelink channel. The operations of 1425 may be performed according to the methods described herein. In some examples, aspects of the operations of 1425 may be performed as described with reference to Figures 5 to 8 The described side link components are performed.

[0295] Fig.15 1 is a flow chart illustrating a method 1500 for supporting sidelink communication according to one or more aspects of the present disclosure. The operations of the method 1500 may be implemented by a device or components thereof as described herein. For example, the operations of the method 1500 may be implemented by a device or components thereof as described herein. Figures 5 to 8 The UE communication manager described herein may be used to perform. In some examples, a device may execute an instruction set to control the functional elements of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform various aspects of the functions described herein.

[0296] At 1505, the device may identify side link information for side link communication. 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 with reference to Figures 5 to 8 The control components described are used to perform.

[0297] At 1510, the device may determine the number of PRBs allocated for sidelink communication. 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 The described transport block components are performed.

[0298] At 1515, the device may determine the number of REs associated with the PRBs allocated for sidelink communication based on the number of allocated PRBs or the estimated number of REs associated with the PRBs, or both. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 5 to 8 The described transport block components are performed.

[0299] At 1520, the device may determine the TBS based on the number of REs associated with the PRBs allocated for the sidelink communication. 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 transport block components are performed.

[0300] At 1525, the device may encode sidelink information for sidelink communication based on the TBS. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be as described with reference to Figures 5 to 8 The control components described are used to perform.

[0301] At 1530, the device may transmit the encoded sidelink information on the physical sidelink channel. The operations of 1530 may be performed according to the methods described herein. In some examples, aspects of the operations of 1530 may be performed as described with reference to Figures 5 to 8 The described side link components are performed.

[0302] Fig.16 1 is a flowchart illustrating a method 1600 for supporting sidelink communication according to one or more aspects of the present disclosure. The operations of the method 1600 may be implemented by a device or components thereof as described herein. For example, the operations of the method 1600 may be implemented by a device or components thereof as described herein. Figures 5 to 8 The UE communication manager described herein may be used to perform. In some examples, a device may execute an instruction set to control the functional elements of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform various aspects of the functions described herein.

[0303] At 1605, the device may identify side link information for side link communication. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 5 to 8 The control components described are used to perform.

[0304] At 1610, the device may determine the number of REs for a first SCI. 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 5 to 8 The described transport block components are performed.

[0305] At 1615, the device may subtract the number of REs used for the first SCI from the number of REs associated with the allocated PRBs. 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 5 to 8 The described transport block components are performed.

[0306] At 1620, the device may determine TBS based on the subtraction. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed as described with reference to Figures 5 to 8 The described transport block components are performed.

[0307] At 1625, the device may transmit a first SCI on the PSCCH based on the TBS. The operations of 1630 may be performed according to the methods described herein. In some examples, aspects of the operations of 1630 may be performed as described with reference to Figures 5 to 8 The described side link components are performed.

[0308] Fig.17 1 is a flowchart illustrating a method 1700 for supporting sidelink communication according to one or more aspects of the present disclosure. The operations of the method 1700 may be implemented by a device or components thereof as described herein. For example, the operations of the method 1700 may be implemented by a device or components thereof as described herein. Figures 5 to 8 The UE communication manager described herein may be used to perform. In some examples, a device may execute an instruction set to control the functional elements of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform various aspects of the functions described herein.

[0309] At 1705, the device may identify side link information for side link communication. 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 with reference to Figures 5 to 8 The control components described are used to perform.

[0310] At 1710, the device may determine the number of REs for the second SCI. 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 5 to 8 The described transport block components are performed.

[0311] At 1715, the device may subtract the number of REs for the second SCI from the estimated number of REs associated with the PRBs or the number of REs associated with the allocated PRBs, or both. 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 5 to 8 The described transport block components are performed.

[0312] At 1720, the device may determine TBS based on the subtraction. 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 5 to 8 The described transport block components are performed.

[0313] At 1725, the device may transmit a second SCI on the PSCCH based on the TBS. The operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be performed as described with reference to Figures 5 to 8 The described side link components are performed.

[0314] Fig.18 1 is a flowchart illustrating a method 1800 for supporting sidelink communication according to one or more aspects of the present disclosure. The operations of the method 1800 may be implemented by a device or components thereof as described herein. For example, the operations of the method 1800 may be implemented by a device or components thereof as described herein. Figures 5 to 8 The UE communication manager described herein may be used to perform. In some examples, a device may execute an instruction set to control the functional elements of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform various aspects of the functions described herein.

[0315] At 1805, the device may identify side link information for side link communication. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed as described with reference to Figures 5 to 8 The control components described are used to perform.

[0316] At 1810, the device may determine a TBS for the sidelink information based on an overhead of a second physical sidelink channel used to convey the sidelink information. 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 5 to 8 The described transport block components are performed.

[0317] At 1815, the device may decode the sidelink information for sidelink communication based on the TBS. 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 5 to 8 The control components described are used to perform.

[0318] At 1820, the device may receive decoded sidelink information on a physical sidelink channel. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed as described with reference to Figures 5 to 8 The described side link components are performed.

[0319] Fig.191 is a flowchart illustrating a method 1900 for supporting sidelink communication according to one or more aspects of the present disclosure. The operations of the method 1900 may be implemented by a device (e.g., a base station) or a component thereof as described herein. For example, the operations of the method 1900 may be implemented by a device (e.g., a base station) or a component thereof as described herein. Figures 9 to 12 The base station communication manager described herein may be used to perform. In some examples, a device may execute an instruction set to control the functional elements of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform various aspects of the functions described herein.

[0320] At 1905, the device may allocate resources for sidelink communications on a physical sidelink channel. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed as described with reference to Figures 9 to 12 The resource components described are executed.

[0321] At 1910, the device may transmit signaling including an indication of resources for sidelink communication based on the allocation. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed as described with reference to Figures 9 to 12 The signaling components described are used to perform the

[0322] At 1915, the device may receive an SCI on the physical sidelink channel based on the signaling, wherein a TBS for the SCI is determined based on an indication of resources for sidelink communication. The operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed as described with reference to Figures 9 to 12 The described side link components are performed.

[0323] 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.

[0324] The following provides an overview of various aspects of the disclosure:

[0325] Aspect 1: A method for wireless communication, comprising: encoding sidelink information for sidelink communication based on a TBS; and transmitting the encoded sidelink information on a physical sidelink channel, the transmission block size being at least partially based on an overhead of a second physical sidelink channel used to convey the sidelink information.

[0326] Aspect 2: The method of Aspect 1 further comprises: determining an estimated number of resource elements associated with a physical resource block for sidelink communication, wherein the transport block size is at least partially based on the estimated number of resource elements associated with the physical resource block.

[0327] Aspect 3: The method of Aspect 2 further includes: determining the number of physical resource blocks allocated for sidelink communication; and determining the number of resource elements associated with the physical resource blocks allocated for sidelink communication based at least in part on the number of allocated physical resource blocks or the estimated number of resource elements associated with the physical resource blocks, or both, wherein the transmission block size is based at least in part on the number of resource elements associated with the physical resource blocks allocated for sidelink communication.

[0328] Aspect 4: The method of aspect 3, further comprising: transmitting signaling including an indication of a number of symbols to be used for transport block size determination, wherein the transport block size is based at least in part on the signaling.

[0329] Aspect 5: The method of Aspect 4 further includes: determining the number of allocated codewords associated with the physical side link channel, the physical side link channel including a physical side link control channel; and subtracting the number of codewords to be used for transport block size determination from the number of allocated codewords associated with the physical side link channel, wherein determining the estimated number of resource elements associated with the physical resource block is at least partially based on the subtraction.

[0330] Aspect 6: The method of any one of aspects 4 to 5, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the number of symbols to be used for transport block size determination.

[0331] Aspect 7: A method as in any one of Aspects 3 to 6, further comprising: determining the number of resource elements used for first side link control information; and subtracting the number of resource elements used for the first side link control information from the number of resource elements associated with the allocated physical resource block, wherein the transmission block size is at least partially based on the subtraction.

[0332] Aspect 8: The method of Aspect 7, wherein transmitting the sidelink information on the physical sidelink channel comprises: transmitting first sidelink control information on a physical sidelink control channel based at least in part on the transport block size.

[0333] Aspect 9: The method of any one of Aspects 7 to 8 further includes: determining that the first physical side link channel and the second physical side link channel are frequency division multiplexed, the first physical side link channel includes a physical side link shared channel, and the second physical side link channel includes a physical side link control channel, wherein the transmission block size is at least partially based on the first physical side link channel and the second physical side link channel being frequency division multiplexed.

[0334] Aspect 10: The method of Aspect 9 further includes: determining the number of resource elements occupied by the physical side link shared channel associated with the allocated physical resource block; and adjusting the overhead of the physical side link control channel based at least in part on the value of the number of resource elements occupied by the physical side link shared channel, wherein the overhead of the physical side link control channel can be time slot by time slot.

[0335] Aspect 11: The method of any one of Aspects 7 to 10 further includes: determining that the first physical side link channel and the second physical side link channel are time division multiplexed, the first physical side link channel includes a physical side link shared channel, and the second physical side link channel includes a physical side link control channel, wherein the transmission block size is at least partially based on determining that the first physical side link channel and the second physical side link channel are time division multiplexed.

[0336] Aspect 12: The method of Aspect 11 further includes: determining an overhead of a physical side link control channel per physical resource block based at least in part on determining that the first physical side link channel and the second physical side link channel are time division multiplexed, wherein the transmission block size is based at least in part on the overhead of the physical side link control channel being physical resource block by physical resource block.

[0337] Aspect 13: A method as in any one of Aspects 11 to 12, further comprising: determining the number of code elements associated with the physical side link control channel or the physical side link shared channel or both; determining the number of code elements that exclusively include the physical side link control channel; and excluding the number of code elements that exclusively include the physical side link control channel from the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the allocated physical resource block or both, wherein the transmission block size is at least partially based on the exclusion.

[0338] Aspect 14: The method of any one of aspects 11 to 13, wherein the transport block size is slot-by-slot based at least in part on an overhead of the physical sidelink control channel.

[0339] Aspect 15: A method as in any one of Aspects 3 to 14, further comprising: determining the number of resource elements used for second side link control information; and subtracting the number of resource elements used for the second side link control information from the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the allocated physical resource block, or both, wherein the transmission block size is at least partially based on the subtraction.

[0340] Aspect 16: The method of Aspect 15 further includes: determining a control overhead associated with the second side link control information based at least in part on a target code rate associated with a modulation and coding scheme, wherein the transmission block size is based at least in part on the control overhead associated with the second side link control information.

[0341] Aspect 17: A method as in any one of Aspects 15 to 16, further comprising: determining a control overhead associated with the second side link control information; and ignoring the control overhead associated with the second side link control information, wherein the transmission block size is at least partially based on ignoring the control overhead associated with the second side link control information.

[0342] Aspect 18: The method of any one of Aspects 15 to 17, further comprising: identifying a modulation and coding scheme for side link communication; and identifying a target code rate based at least in part on the modulation and coding scheme for side link communication, wherein determining the number of resource elements for second side link control information is based at least in part on the target code rate.

[0343] Aspect 19: A method as in any one of Aspects 15 to 18, wherein transmitting the sidelink information on the physical sidelink channel comprises: transmitting second sidelink control information on a physical sidelink shared channel based at least in part on the transport block size.

[0344] Aspect 20: The method of any one of aspects 3 to 19, further comprising: transmitting signaling including an indication of an overhead value, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the signaled overhead value.

[0345] Aspect 21: A method as in any one of Aspects 3 to 20, further comprising: transmitting signaling including an indication of an offset overhead value relative to a demodulation reference signal pattern, wherein determining an estimated number of resource elements associated with the physical resource block is at least partially based on the offset overhead value notified by the signaling.

[0346] Aspect 22: The method of any one of aspects 3 to 21, further comprising: adjusting the number of resource elements associated with the physical resource blocks allocated for sidelink communication to the number of resource elements associated with the physical resource blocks allocated for non-sidelink communication.

[0347] Aspect 23: A method as in any one of Aspects 3 to 22, further comprising: determining a channel state information reference signal overhead; and suppressing use of the channel state information reference signal overhead in determining an estimated number of resource elements associated with a physical resource block or determining the number of resource elements associated with an allocated physical resource block, or both, wherein the transmission block size is at least partially based on the omission.

[0348] Aspect 24: A method for wireless communication, comprising: decoding sidelink information for sidelink communication based on a TBS; and receiving the decoded sidelink information on a physical sidelink channel, the transmission block size being at least partially based on an overhead of a second physical sidelink channel used to communicate the sidelink information.

[0349] Aspect 25: The method of Aspect 24 further comprises: determining an estimated number of resource elements associated with a physical resource block for sidelink communication, wherein the transport block size is based at least in part on the estimated number of resource elements associated with the physical resource block.

[0350] Aspect 26: The method of Aspect 25 further includes: determining the number of physical resource blocks allocated for sidelink communication; and determining the number of resource elements associated with the physical resource blocks allocated for sidelink communication based at least in part on the number of allocated physical resource blocks or the estimated number of resource elements associated with the physical resource blocks, or both, wherein the transmission block size is based at least in part on the number of resource elements associated with the physical resource blocks allocated for sidelink communication.

[0351] Aspect 27: The method of Aspect 26 further includes: determining the number of resource elements used for first side link control information; and subtracting the number of resource elements used for the first side link control information from the number of resource elements associated with the allocated physical resource block, wherein the transmission block size is at least partially based on the subtraction.

[0352] Aspect 28: A method for wireless communication, comprising: identifying sidelink control information for sidelink communication; determining a transmission block size for the sidelink control information; and transmitting the sidelink control information on a physical sidelink channel based at least in part on the transmission block size.

[0353] Aspect 29: The method of Aspect 28 further comprises: determining an estimated number of resource elements associated with a physical resource block for sidelink communication, wherein determining the transport block size is based at least in part on the estimated number of resource elements associated with the physical resource block.

[0354] Aspect 30: The method of Aspect 29 further includes: determining the number of physical resource blocks allocated for sidelink communication; and determining the number of resource elements associated with the physical resource blocks used for sidelink communication based at least in part on the number of allocated physical resource blocks or the estimated number of resource elements associated with the physical resource blocks, or both, wherein determining the transmission block size is based at least in part on the number of resource elements associated with the physical resource blocks used for sidelink communication.

[0355] Aspect 31: The method of Aspect 30 further includes: determining the number of resource elements used for first side link control information; and subtracting the number of resource elements used for the first side link control information from the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the physical resource block, or both, wherein determining the transmission block size is at least partially based on the subtraction.

[0356] Aspect 32: The method of Aspect 31 further includes: determining a control overhead associated with the first side link control information; and suppressing the use of the control overhead in the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the physical resource block, or both, wherein determining the transmission block size is at least partially based on the suppression.

[0357] Aspect 33: A method as in any one of Aspects 31 to 32, wherein transmitting the sidelink control information on the physical sidelink channel comprises: transmitting first sidelink control information on the physical sidelink control channel based at least in part on the transport block size.

[0358] Aspect 34: A method as in any one of Aspects 31 to 33, further comprising: determining that the first physical side link channel and the second physical side link channel are frequency division multiplexed, the first physical side link channel includes a physical side link shared channel, and the second physical side link channel includes a physical side link control channel, wherein determining the transmission block size is at least partially based on the fact that the first physical side link channel and the second physical side link channel are frequency division multiplexed.

[0359] Aspect 35: The method of Aspect 34 further includes: determining the number of resource elements associated with the physical resource block occupied by the physical side link shared channel; and scaling the overhead of the physical side link control channel by the value of the resource elements occupied by the physical side link shared channel.

[0360] Aspect 36: The method of any one of Aspects 31 to 35, wherein determining the transport block size is based at least in part on an overhead of the physical sidelink control channel per time slot.

[0361] Aspect 37: The method of any one of Aspects 31 to 36 further includes: determining that the first physical side link channel and the second physical side link channel are time division multiplexed, the first physical side link channel includes a physical side link shared channel, and the second physical side link channel includes a physical side link control channel, wherein determining the transmission block size is at least partially based on the fact that the first physical side link channel and the second physical side link channel are time division multiplexed.

[0362] Aspect 38: The method of Aspect 37 further includes: determining an overhead of a physical side link control channel per physical resource block based at least in part on the fact that the first physical side link channel and the second physical side link channel are time division multiplexed, wherein determining the transmission block size is based at least in part on the overhead of the physical side link control channel per physical resource block.

[0363] Aspect 39: The method of any one of Aspects 37 to 38 further includes: determining the number of code elements associated with the physical side link control channel or the physical side link shared channel or both; determining the number of code elements that exclusively include the physical side link control channel; and excluding the number of code elements that exclusively include the physical side link control channel from the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the physical resource block or both, wherein determining the transmission block size is at least partially based on the exclusion.

[0364] Aspect 40: The method of any one of Aspects 37 to 39, wherein determining the transport block size is based at least in part on an overhead of the physical sidelink control channel per time slot.

[0365] Aspect 41: A method as in any one of Aspects 30 to 40, further comprising: determining the number of resource elements used for second side link control information; and subtracting the number of resource elements used for the second side link control information from the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the physical resource block, or both, wherein determining the transmission block size is at least partially based on the subtraction.

[0366] Aspect 42: The method of Aspect 41 further includes: determining a control overhead associated with the second side link control information based at least in part on a target code rate associated with a modulation and coding scheme, wherein determining the transmission block size is based at least in part on the control overhead associated with the second side link control information.

[0367] Aspect 43: The method of any one of Aspects 41 to 42, further comprising: ignoring control overhead associated with the second side link control information, wherein determining the transport block size is at least partially based on ignoring the control overhead associated with the second side link control information.

[0368] Aspect 44: A method as in any one of Aspects 41 to 43, further comprising: identifying a modulation and coding scheme for second side link control information; and identifying a target code rate based at least in part on the modulation and coding scheme for the second side link control information, wherein determining the number of resource elements for the second side link control information is based at least in part on the target code rate.

[0369] Aspect 45: A method as in any one of Aspects 41 to 44, wherein transmitting the sidelink control information on the physical sidelink channel comprises: transmitting second sidelink control information on a physical sidelink shared channel based at least in part on the transport block size.

[0370] Aspect 46: The method of any one of aspects 30 to 45, further comprising: transmitting signaling including an indication of an overhead value, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the signaled overhead value.

[0371] Aspect 47: A method as in any one of Aspects 30 to 46, further comprising: transmitting signaling including an indication of an offset overhead value relative to a demodulation reference signal pattern, wherein determining an estimated number of resource elements associated with the physical resource block is based at least in part on the offset overhead value notified by the signaling.

[0372] Aspect 48: The method of any one of aspects 30 to 47, further comprising: transmitting signaling including an indication of a number of symbols to be used for transport block size determination, wherein determining the transport block size is based at least in part on the signaling.

[0373] Aspect 49: The method of Aspect 48 further includes: determining the number of allocated codewords associated with the physical side link channel, the physical side link channel including a physical side link control channel; and subtracting the number of codewords to be used for determining the transmission block size from the number of allocated codewords associated with the physical side link channel, wherein determining the estimated number of resource elements associated with the physical resource block is at least partially based on the subtraction.

[0374] Aspect 50: The method of any one of Aspects 48 to 49, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the number of symbols to be used for transport block size determination.

[0375] Aspect 51: The method of any one of Aspects 30 to 50, further comprising: adjusting the number of resource elements associated with the physical resource blocks used for sidelink communication to the number of resource elements associated with the physical resource blocks used for non-sidelink communication.

[0376] Aspect 52: A method as in any one of Aspects 30 to 51, further comprising: determining a channel state information reference signal overhead; and suppressing use of the channel state information reference signal overhead in determining an estimated number of resource elements associated with the physical resource block or determining the number of resource elements associated with the physical resource block, or both, wherein determining the transport block size is at least partially based on the ignoring.

[0377] Aspect 53: The method of any one of Aspects 29 to 52, further comprising: determining a number of subcarriers associated with the physical resource block, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the number of subcarriers associated with the physical resource block.

[0378] Aspect 54: A method as in any one of Aspects 29 to 53, further comprising: determining the number of allocated codewords associated with a physical side link channel, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on one or more of the number of subcarriers associated with the physical resource block and the number of allocated codewords associated with the physical side link channel.

[0379] Aspect 55: A method as in any one of Aspects 29 to 54, further comprising: determining a demodulation reference signal overhead associated with the physical resource block, wherein determining the estimated number of resource elements associated with the physical resource block is at least partially based on the demodulation reference signal overhead associated with the physical resource block.

[0380] Aspect 56: The method of any one of Aspects 29 to 55, further comprising: determining a control overhead associated with the physical resource block, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the control overhead associated with the physical resource block.

[0381] Aspect 57: The method of any one of Aspects 28 to 56 further comprises: determining an overhead of the physical side link channel based at least in part on a time period of the physical side link channel, wherein determining the transport block size is based at least in part on the overhead of the physical side link channel.

[0382] Aspect 58: The method of Aspect 57, wherein the physical sidelink channel comprises a physical sidelink feedback channel.

[0383] Aspect 59: The method of any one of Aspects 57 to 58, further comprising: scaling the overhead of the physical side link channel based at least in part on the period of the physical side link channel, wherein determining the transport block size is based at least in part on the scaling.

[0384] Aspect 60: The method as in any one of Aspects 57 to 59, further comprising: determining an average value of the overhead of the physical side link channel over the time period of the physical side link channel, wherein determining the transmission block size is at least partially based on the average value of the overhead of the physical side link channel over the time period of the physical side link channel.

[0385] Aspect 61: The method of any one of Aspects 57 to 60, further comprising: applying the overhead of the physical sidelink channel as a value per physical resource block, wherein determining the transport block size is based at least in part on the applying.

[0386] Aspect 62: A method as in any one of Aspects 57 to 61, wherein the overhead of the physical side link channel corresponds to the number of available symbols of a second physical side link channel, the second physical side link channel comprising a physical side link shared channel.

[0387] Aspect 63: A method as in any one of Aspects 28 to 62, wherein the physical side link channel comprises a physical side link shared channel.

[0388] Aspect 64: A method as in any one of Aspects 28 to 63, wherein the physical sidelink channel comprises a physical sidelink control channel.

[0389] Aspect 65: A method for wireless communication, comprising: identifying sidelink control information for sidelink communication; determining a transmission block size for the sidelink control information; and receiving the sidelink control information on a physical sidelink channel based at least in part on the transmission block size.

[0390] Aspect 66: The method of Aspect 65 further comprises: determining an estimated number of resource elements associated with a physical resource block for sidelink communication, wherein determining the transport block size is based at least in part on the estimated number of resource elements associated with the physical resource block.

[0391] Aspect 67: The method of Aspect 66 further includes: determining the number of physical resource blocks allocated for sidelink communication; and determining the number of resource elements associated with the physical resource blocks used for sidelink communication based at least in part on the number of allocated physical resource blocks or the estimated number of resource elements associated with the physical resource blocks, or both, wherein determining the transmission block size is based at least in part on the number of resource elements associated with the physical resource blocks used for sidelink communication.

[0392] Aspect 68: The method of Aspect 67 further includes: determining the number of resource elements used for first side link control information; and subtracting the number of resource elements used for the first side link control information from the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the physical resource block, or both, wherein determining the transmission block size is at least partially based on the subtraction.

[0393] Aspect 69: The method of Aspect 68 further includes: determining a control overhead associated with the first side link control information; and suppressing the use of the control overhead in the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the physical resource block, or both, wherein determining the transmission block size is at least partially based on the suppression.

[0394] Aspect 70: A method as in any one of Aspects 68 to 69, wherein receiving the sidelink control information on the physical sidelink channel comprises: receiving first sidelink control information on the physical sidelink control channel based at least in part on the transport block size.

[0395] Aspect 71: The method of any one of Aspects 68 to 70 further includes: determining that the first physical side link channel and the second physical side link channel are frequency division multiplexed, the first physical side link channel includes a physical side link shared channel, and the second physical side link channel includes a physical side link control channel, wherein determining the transmission block size is at least partially based on the fact that the first physical side link channel and the second physical side link channel are frequency division multiplexed.

[0396] Aspect 72: The method of any one of Aspects 68 to 71 further includes: determining the number of resource elements associated with the physical resource block occupied by the physical side link shared channel; and scaling the overhead of the physical side link control channel by the value of the resource elements occupied by the physical side link shared channel.

[0397] Aspect 73: The method of any one of Aspects 68 to 72, wherein determining the transport block size is based at least in part on an overhead of the physical sidelink control channel per time slot.

[0398] Aspect 74: The method of any one of Aspects 68 to 73 further includes: determining that the first physical side link channel and the second physical side link channel are time division multiplexed, the first physical side link channel includes a physical side link shared channel, and the second physical side link channel includes a physical side link control channel, wherein determining the transmission block size is at least partially based on the fact that the first physical side link channel and the second physical side link channel are time division multiplexed.

[0399] Aspect 75: The method of Aspect 74 further includes: determining an overhead of a physical side link control channel per physical resource block based at least in part on the fact that the first physical side link channel and the second physical side link channel are time division multiplexed, wherein determining the transmission block size is based at least in part on the overhead of the physical side link control channel per physical resource block.

[0400] Aspect 76: The method of any one of Aspects 74 to 75 further includes: determining the number of code elements associated with the physical side link control channel or the physical side link shared channel or both; determining the number of code elements that exclusively include the physical side link control channel; and excluding the number of code elements that exclusively include the physical side link control channel from the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the physical resource block or both, wherein determining the transmission block size is at least partially based on the exclusion.

[0401] Aspect 77: The method of any one of Aspects 74 to 76, wherein determining the transport block size is based at least in part on an overhead of a physical sidelink control channel per time slot.

[0402] Aspect 78: A method as in any one of Aspects 67 to 77, further comprising: determining the number of resource elements used for second side link control information; and subtracting the number of resource elements used for the second side link control information from the estimated number of resource elements associated with the physical resource block or the number of resource elements associated with the physical resource block, or both, wherein determining the transmission block size is at least partially based on the subtraction.

[0403] Aspect 79: The method of Aspect 78 further includes: determining a control overhead associated with the second side link control information based at least in part on a target code rate associated with a modulation and coding scheme, wherein determining the transmission block size is based at least in part on the control overhead associated with the second side link control information.

[0404] Aspect 80: The method of any one of Aspects 78 to 79, further comprising: ignoring control overhead associated with the second side link control information, wherein determining the transport block size is at least partially based on ignoring the control overhead associated with the second side link control information.

[0405] Aspect 81: A method as in any one of Aspects 78 to 80, further comprising: identifying a modulation and coding scheme for second side link control information; and identifying a target code rate based at least in part on the modulation and coding scheme for the second side link control information, wherein determining the number of resource elements for the second side link control information is based at least in part on the target code rate.

[0406] Aspect 82: A method as in any one of Aspects 78 to 81, wherein receiving the sidelink control information on the physical sidelink channel comprises: receiving second sidelink control information on a physical sidelink shared channel based at least in part on the transport block size.

[0407] Aspect 83: The method of any one of Aspects 67 to 82, further comprising: receiving signaling including an indication of an overhead value, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the signaled overhead value.

[0408] Aspect 84: A method as in any one of Aspects 67 to 83, further comprising: receiving signaling including an indication of an offset overhead value relative to a demodulation reference signal pattern, wherein determining an estimated number of resource elements associated with the physical resource block is at least partially based on the offset overhead value notified by the signaling.

[0409] Aspect 85: The method of any one of Aspects 67 to 84, further comprising: receiving signaling including an indication of a number of symbols to be used for transport block size determination, wherein determining the transport block size is based at least in part on the signaling.

[0410] Aspect 86: The method of Aspect 85 further includes: determining the number of allocated codewords associated with the physical side link channel, the physical side link channel including a physical side link control channel; and subtracting the number of codewords to be used for determining the transmission block size from the number of allocated codewords associated with the physical side link channel, wherein determining the estimated number of resource elements associated with the physical resource block is at least partially based on the subtraction.

[0411] Aspect 87: The method of any one of Aspects 85 to 86, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the number of symbols to be used for transport block size determination.

[0412] Aspect 88: The method of any one of Aspects 67 to 87, further comprising: adjusting the number of resource elements associated with the physical resource blocks used for sidelink communication to the number of resource elements associated with the physical resource blocks used for non-sidelink communication.

[0413] Aspect 89: A method as in any one of Aspects 67 to 88, further comprising: determining a channel state information reference signal overhead; and suppressing use of the channel state information reference signal overhead in determining an estimated number of resource elements associated with the physical resource block or in determining the number of resource elements associated with the physical resource block, or both, wherein determining the transport block size is at least partially based on the ignoring.

[0414] Aspect 90: The method of any one of Aspects 66 to 89, further comprising: determining a number of subcarriers associated with the physical resource block, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the number of subcarriers associated with the physical resource block.

[0415] Aspect 91: A method as in any one of Aspects 66 to 90, further comprising: determining a number of allocated codewords associated with a physical side link channel, wherein determining an estimated number of resource elements associated with the physical resource block is based at least in part on one or more of a number of subcarriers associated with the physical resource block and the number of allocated codewords associated with the physical side link channel.

[0416] Aspect 92: A method as in any one of Aspects 66 to 91, further comprising: determining a demodulation reference signal overhead associated with the physical resource block, wherein determining the estimated number of resource elements associated with the physical resource block is at least partially based on the demodulation reference signal overhead associated with the physical resource block.

[0417] Aspect 93: The method of any one of Aspects 66 to 92, further comprising: determining a control overhead associated with the physical resource block, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on the control overhead associated with the physical resource block.

[0418] Aspect 94: The method of any one of Aspects 65 to 93 further comprises: determining an overhead of the physical side link channel based at least in part on a time period of the physical side link channel, wherein determining the transmission block size is based at least in part on the overhead of the physical side link channel.

[0419] Aspect 95: The method of Aspect 94, wherein the physical side link channel comprises a physical side link feedback channel.

[0420] Aspect 96: The method of any one of Aspects 94 to 95, further comprising: scaling the overhead of the physical side link channel based at least in part on the period of the physical side link channel, wherein determining the transport block size is based at least in part on the scaling.

[0421] Aspect 97: The method of any one of Aspects 94 to 96 further includes: determining an average value of the overhead of the physical side link channel over the time period of the physical side link channel, wherein determining the transmission block size is at least partially based on the average value of the overhead of the physical side link channel over the time period of the physical side link channel.

[0422] Aspect 98: The method of any one of Aspects 94 to 97, further comprising: applying the overhead of the physical sidelink channel as a value per physical resource block, wherein determining the transport block size is based at least in part on the applying.

[0423] Aspect 99: A method as in any one of Aspects 94 to 98, wherein the overhead of the physical side link channel corresponds to the number of available codewords of the second physical side link channel, and the second physical side link channel includes a physical side link shared channel.

[0424] Aspect 100: The method of any one of Aspects 65 to 99, wherein the physical sidelink channel comprises a physical sidelink shared channel.

[0425] Aspect 101: A method as in any one of Aspects 65 to 100, wherein the physical sidelink channel comprises a physical sidelink control channel.

[0426] Aspect 102: A method for wireless communication, comprising: allocating resources for sidelink communication on a physical sidelink channel; transmitting signaling including an indication of resources for sidelink communication based at least in part on the allocation; and receiving sidelink control information on the physical sidelink channel based at least in part on the signaling, wherein a transmission block size for the sidelink control information is determined at least in part based on the indication of resources for sidelink communication.

[0427] Aspect 103: A method as in aspect 102, wherein transmitting the signaling includes: transmitting signaling including an indication of an overhead value, wherein the estimated number of resource elements associated with the physical resource block used for sidelink communication is based at least in part on the signaled overhead value.

[0428] Aspect 104: A method as in any one of Aspects 102 to 103, wherein transmitting the signaling comprises: transmitting signaling comprising an indication of a number of codewords to be used for transport block size determination, wherein the transport block size is at least partially based on the number of codewords to be used for transport block size determination.

[0429] Aspect 105: The method of any one of Aspects 102 to 104, wherein the physical sidelink channel comprises a physical sidelink shared channel.

[0430] Aspect 106: The method of any one of Aspects 102 to 105, wherein the physical sidelink channel comprises a physical sidelink control channel.

[0431] Aspect 107: An apparatus for wireless communication, comprising: a processor; and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 1 to 23.

[0432] Aspect 108: An apparatus for wireless communication, comprising at least one means for performing the method of any one of Aspects 1 to 23.

[0433] Aspect 109: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 23.

[0434] Aspect 110: An apparatus for wireless communication, comprising: a processor; and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 24 to 27.

[0435] Aspect 111: An apparatus for wireless communication, comprising at least one means for performing the method of any one of Aspects 24 to 27.

[0436] Aspect 112: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 24 to 27.

[0437] Aspect 113: An apparatus for wireless communication, comprising: a processor; and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 28 to 64.

[0438] Aspect 114: An apparatus for wireless communication, comprising at least one means for performing the method of any one of Aspects 28 to 64.

[0439] Aspect 115: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 28 to 64.

[0440] Aspect 116: An apparatus for wireless communication, comprising: a processor; and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 65 to 101.

[0441] Aspect 117: An apparatus for wireless communication, comprising at least one means for performing the method of any one of Aspects 65 to 101.

[0442] Aspect 118: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 65 to 101.

[0443] Aspect 119: An apparatus for wireless communication, comprising: a processor; and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 102 to 106.

[0444] Aspect 120: An apparatus for wireless communication, comprising at least one means for performing the method of any one of aspects 102 to 106.

[0445] Aspect 121: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 102 to 106.

[0446] 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.

[0447] 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.

[0448] 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).

[0449] 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.

[0450] 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.

[0451] 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."

[0452] 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.

[0453] 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.

[0454] 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 method for wireless communication by a first user equipment UE, comprising: receiving signaling including an indication of a demodulation reference signal pattern associated with a physical sidelink shared channel; encoding the sidelink information based at least in part on a transport block size, wherein the transport block size is based at least in part on a first number of resource elements occupied by a physical sidelink control channel associated with the first stage sidelink control information, a second number of resource elements associated with the second stage sidelink control information, and a third number of resource elements associated with the indicated demodulation reference signal pattern; and The encoded sidelink information is transmitted to the second UE via the physical sidelink shared channel.

2. The method of claim 1, further comprising: determining an estimated number of resource elements associated with a physical resource block for sidelink communications, Wherein the transport block size is based at least in part on an estimated number of resource elements associated with the physical resource block.

3. The method of claim 2, further comprising: determining a number of physical resource blocks allocated for the sidelink communication; as well as determining a fourth number of resource elements associated with the physical resource blocks allocated for the sidelink communication based at least in part on the number of allocated physical resource blocks or an estimated number of resource elements associated with the physical resource blocks, or both, Wherein the transport block size is based at least in part on a fourth number of resource elements associated with a physical resource block allocated for the sidelink communication.

4. The method of claim 3, further comprising: transmitting signaling including an indication of a number of symbols to be used for transport block size determination, Wherein the transport block size is based at least in part on the signaling.

5. The method of claim 4, further comprising: determining an allocated number of symbols associated with the physical sidelink control channel; as well as subtracting a number of symbols to be used for the transport block size determination from an allocated number of symbols associated with the physical sidelink control channel, Wherein determining an estimated number of resource elements associated with the physical resource block is based at least in part on the subtracting.

6. The method of claim 4, wherein determining the estimated number of resource elements associated with the physical resource block is based at least in part on a number of symbols to be used for the transport block size determination.

7. The method of claim 3, further comprising: subtracting a first number of resource elements occupied by the physical sidelink control channel associated with the first stage sidelink control information from a fourth number of resource elements associated with the allocated physical resource block, Wherein the transport block size is based at least in part on the subtraction.

8. The method of claim 7, further comprising: The first stage sidelink control information is transmitted on the physical sidelink control channel based at least in part on the transport block size.

9. The method of claim 7, further comprising: determining that the physical side link control channel and the physical side link shared channel are frequency division multiplexed, The transport block size is based at least in part on the physical sidelink control channel and the physical sidelink shared channel being frequency division multiplexed.

10. The method of claim 9, further comprising: determining that the physical sidelink shared channel occupies a fourth number of resource elements associated with the allocated physical resource block; as well as An overhead of the physical side link control channel is adjusted at least in part based on a value of a fourth number of resource elements occupied by the physical side link shared channel, wherein the overhead of the physical side link control channel is slot-by-slot, wherein a first number of resource elements occupied by the physical side link control channel is based at least in part on adjusting the overhead of the physical side link control channel.

11. The method of claim 7, further comprising: determining that the physical side link control channel and the physical side link shared channel are time division multiplexed, The transport block size is based at least in part on determining that the physical sidelink control channel and the physical sidelink shared channel are time division multiplexed.

12. The method of claim 11, further comprising: determining an overhead of a physical sidelink control channel per physical resource block based at least in part on determining that the physical sidelink control channel and the physical sidelink shared channel are time division multiplexed, Wherein the transport block size and the first number of resource elements occupied by the physical sidelink control channel are based at least in part on an overhead of the physical sidelink control channel on a physical resource block by physical resource block basis.

13. The method of claim 11, further comprising: determining a number of symbols associated with the physical sidelink control channel or the physical sidelink shared channel or both; determining a number of symbols that exclusively comprise the physical sidelink control channel; and excluding from the estimated number of resource elements associated with the physical resource block or from a fourth number of resource elements associated with the allocated physical resource block, or both, a number of symbols exclusively comprising the physical sidelink control channel, Wherein the transport block size is based at least in part on the exclusion.

14. The method of claim 11, wherein the transport block size is slot-by-slot based at least in part on an overhead of the physical sidelink control channel.

15. The method of claim 3, further comprising: subtracting a second number of resource elements associated with the second stage sidelink control information from an estimated number of resource elements associated with the physical resource block or a fourth number of resource elements associated with the allocated physical resource block, or both, Wherein the transport block size is based at least in part on the subtraction.

16. The method of claim 15, further comprising: determining a control overhead associated with the second stage sidelink control information based at least in part on a target code rate associated with a modulation and coding scheme, Wherein the transport block size is based at least in part on the control overhead associated with the second stage sidelink control information.

17. The method of claim 15, further comprising: determining a control overhead associated with the second stage sidelink control information; and Ignoring the control overhead associated with the second stage sidelink control information, Wherein the transport block size is based at least in part on ignoring the control overhead associated with the second stage sidelink control information.

18. The method of claim 15, further comprising: identifying a modulation and coding scheme to be used for the sidelink communication; as well as identifying a target code rate based at least in part on the modulation and coding scheme for the sidelink communication, Wherein determining a second number of resource elements associated with the second-stage sidelink control information is based at least in part on the target code rate.

19. The method of claim 15, wherein transmitting the sidelink information via the physical sidelink shared channel comprises: The second stage sidelink control information is transmitted via the physical sidelink shared channel based at least in part on the transport block size.

20. The method of claim 3, further comprising: receiving an indication of an overhead value associated with the physical sidelink shared channel, Wherein determining an estimated number of resource elements associated with the physical resource block is based at least in part on the indicated overhead value.

21. The method of claim 20, wherein: The overhead value is an offset overhead value relative to the indicated demodulation reference signal mode, Determining an estimated number of resource elements associated with the physical resource block is based at least in part on the offset overhead value.

22. The method of claim 3, further comprising: A fourth number of resource elements associated with the physical resource blocks allocated for the sidelink communication is adjusted to a fifth number of resource elements associated with the physical resource blocks allocated for non-sidelink communication.

23. The method of claim 3, further comprising: determining a channel state information reference signal overhead; as well as refraining from using the channel state information reference signal overhead in determining an estimated number of resource elements associated with the physical resource block or in determining a fourth number of resource elements associated with the allocated physical resource block, or both, Wherein the transport block size is based at least in part on the suppression.

24. A method for wireless communication by a first user equipment UE, comprising: receiving signaling including an indication of a demodulation reference signal pattern associated with a physical sidelink shared channel; receiving sidelink information from a second UE via the physical sidelink shared channel; The sidelink information is decoded based at least in part on a transport block size based at least in part on a first number of resource elements occupied by a physical sidelink control channel associated with the first stage sidelink control information, a second number of resource elements associated with the second stage sidelink control information, and a third number of resource elements associated with an indicated demodulation reference signal mode.

25. The method of claim 24, further comprising: determining an estimated number of resource elements associated with a physical resource block used for the sidelink communication, Wherein the transport block size is based at least in part on an estimated number of resource elements associated with the physical resource block.

26. The method of claim 25, further comprising: determining a number of physical resource blocks allocated for sidelink communications; as well as determining a fourth number of resource elements associated with the physical resource blocks allocated for the sidelink communication based at least in part on the number of allocated physical resource blocks or an estimated number of resource elements associated with the physical resource blocks, or both, Wherein the transport block size is based at least in part on a fourth number of resource elements associated with a physical resource block allocated for the sidelink communication.

27. The method of claim 26, further comprising: subtracting a first number of resource elements occupied by a physical sidelink control channel associated with the first stage sidelink control information from a fourth number of resource elements associated with the allocated physical resource block, Wherein the transport block size is based at least in part on the subtraction.

28. A first user equipment UE for wireless communication, comprising: one or more processors; as well as a memory coupled to the one or more processors, the one or more processors being individually or collectively configured to cause the first UE to: receiving signaling including an indication of a demodulation reference signal pattern associated with a physical sidelink shared channel; encoding the sidelink information based at least in part on a transport block size, wherein the transport block size is based at least in part on a first number of resource elements occupied by a physical sidelink control channel associated with the first stage sidelink control information, a second number of resource elements associated with the second stage sidelink control information, and a third number of resource elements associated with the indicated demodulation reference signal pattern; and The encoded sidelink information is transmitted to the second UE via the physical sidelink shared channel.

29. The first UE according to claim 28, further comprising: antenna.

30. A first user equipment UE for wireless communication, comprising: one or more processors; as well as a memory coupled to the one or more processors, the one or more processors being individually or collectively configured to cause the first UE to: receiving signaling including an indication of a demodulation reference signal pattern associated with a physical sidelink shared channel; receiving sidelink information from a second UE via the physical sidelink shared channel; The sidelink information is decoded based at least in part on a transport block size based at least in part on a first number of resource elements occupied by a physical sidelink control channel associated with the first stage sidelink control information, a second number of resource elements associated with the second stage sidelink control information, and a third number of resource elements associated with an indicated demodulation reference signal mode.

Images