Technique for sidelink communication using sidelink resource pools configured for different radio access technologies

Abstract

Methods, systems, and devices for wireless communications are described. A transmitting device and a receiving device may transmit a sidelink message for a second radio access technology (RAT) using a sidelink resource pool that is signaled using a first RAT. For example, a receiving UE may receive a sidelink control channel associated with the first RAT (e.g., Long Term Evolution (LTE)), may determine a set of time and frequency resources indicated by the sidelink control channel, and may then monitor the set of time and frequency resources to receive a sidelink message associated with the second RAT (e.g., New Radio (NR)). In some embodiments, the set of time and frequency resources may be indicated as available for the second RAT via a field in the sidelink control channel or via an additional sidelink message associated with the second RAT that is sent using the sidelink control channel.

Description

[0001] Cross-references

[0002] This patent application claims priority to Greek Patent Application No. 20200100482, entitled "TECHNIQUES FOR SIDELINK COMMUNICATIONS USING A SIDELINK RESOURCE POOL CONFIGURED FOR A DIFFERENTRADIO ACCESS TECHNOLOGY", filed by Sarkis et al. on August 17, 2020; which is assigned to the assignee of this application and its entire contents are incorporated herein by reference. Technical Field

[0003] The following relates generally to wireless communications, and more particularly, to sidelink communications using sidelink resource pools configured for different radio access technologies (RATs). Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems can 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 that may be referred to as new radio (NR) systems. These systems may employ techniques 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 multiple access (DFT-S-OFDM).

[0005] A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication of multiple communication devices, which may be referred to as user equipment (UE). In some wireless communications, a first UE may communicate directly with a second UE via sidelink communication. Effective techniques are required to support sidelink communication. Summary of the invention

[0006] The described technology relates to improved methods, systems, devices and apparatus for supporting sidelink communications using sidelink resource pools configured for different radio access technologies (RATs). In general, the described technology provides a transmitting user equipment (UE) and a receiving UE to transmit a sidelink message of a second RAT using a sidelink resource pool initially configured for a first RAT different from a second RAT. For example, the receiving UE may receive a first sidelink message in a sidelink control channel configured for the first RAT (e.g., Long Term Evolution (LTE)), may determine a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel, and may subsequently monitor the set of time and frequency resources to receive a second sidelink message configured for a second RAT (e.g., New Radio (NR)). In some embodiments, the first sidelink message received in the sidelink control channel may include a field indicating that the set of time and frequency resources is configured for or that the set of time and frequency resources may be used for communications associated with the second RAT. Additionally or alternatively, the receiving UE may receive an additional sidelink message indicating that the set of time and frequency resources is configured or may be used for communications associated with the second RAT. The same sending UE may send the first sidelink message in the sidelink control channel and send the second sidelink message on the set of time and frequency resources indicated by the first sidelink message, or the first sending UE may send the first sidelink message in the sidelink control channel and the second UE may send the second sidelink message on the set of time and frequency resources indicated by the first sidelink message sent in the sidelink control channel.

[0007] In some embodiments, the first RAT may use a first subcarrier spacing (SCS) such that the sidelink control channel is sent and received according to the first SCS, and the second RAT may use a second SCS such that the second sidelink message is sent and received according to the second SCS. Based on these different SCSs, a single transmission time interval (TTI) (e.g., an LTE slot) for the first RAT may span multiple TTIs (e.g., multiple NR slots) for the second RAT. For example, the sidelink control channel may extend a first time length, and the second sidelink message may extend a second time length that is shorter than the first time length, so that once the transmission and reception opportunity for the second sidelink message has passed, the set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel is still reserved. Thus, the remaining portion of the reserved time and frequency resource set after completion of the second sidelink message can be used for retransmission of the sidelink message, can be used by an additional UE, can be used for a transport block (TB) spanning multiple TTIs for the second RAT, can be used to aggregate the multiple TTIs for the second RAT, or a combination thereof.

[0008] A method for wireless communication at a receiving device is described. The method may include receiving a first sidelink message in a sidelink control channel configured for a first RAT, determining a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel, and monitoring a second sidelink message associated with a second RAT different from the first RAT on the set of time and frequency resources.

[0009] An apparatus for wireless communication at a receiving device is described. The apparatus may include: a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to: receive a first sidelink message in a sidelink control channel configured for a first RAT; determine a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel; and monitor on the set of time and frequency resources for a second sidelink message associated with a second RAT, the second RAT being different from the first RAT.

[0010] Another apparatus for wireless communication at a receiving device is described. The apparatus may include components for: receiving a first sidelink message in a sidelink control channel configured for a first RAT; determining a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel; and monitoring on the set of time and frequency resources for a second sidelink message associated with a second RAT, the second RAT being different from the first RAT.

[0011] A non-transitory computer-readable medium storing code for wireless communication at a receiving device is described. The code may include instructions executable by a processor to: receive a first sidelink message in a sidelink control channel configured for a first RAT; determine a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel; and monitor on the set of time and frequency resources for a second sidelink message associated with a second RAT, the second RAT being different from the first RAT.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that a first SCS associated with the first RAT may be different from a second SCS associated with the second RAT, wherein based on the first SCS being different from the second SCS, multiple TTIs configured for the second RAT overlap with a single TTI used for the sidelink control channel.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, monitoring the second sidelink message may include operations, features, components, or instructions for monitoring the second sidelink message in a first TTI of the plurality of TTIs.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for monitoring a retransmission of the second sidelink message in one or more remaining TTIs of the plurality of TTIs following the first TTI.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, one or more TTIs in the plurality of TTIs following the first TTI may be used by an additional device operating in the second RAT.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: determining that the second sidelink message includes a TB spanning two or more of the multiple TTIs; and monitoring the TB in each of the two or more TTIs.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: determining that the second sidelink message can be sent in two or more TTIs of the multiple TTIs; and monitoring the second sidelink message in each of the two or more TTIs, wherein the receiving device can combine each received instance of the sidelink message from the two or more TTIs.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second sidelink message can be sent in the two or more TTIs based on a redundancy version (RV) cycle configuration.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving the first sidelink message and the second sidelink message in the sidelink control channel from the same transmitting device.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving the first sidelink message in the sidelink control channel from the first transmitting device; and receiving the second sidelink message from the second transmitting device.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the first sidelink message in the sidelink control channel may include operations, features, components, or instructions for receiving in the sidelink control channel a field in the first sidelink message indicating the set of time and frequency resources configured for the second RAT.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the first sidelink message in the sidelink control channel may include operations, features, components, or instructions for: receiving the first sidelink message in the sidelink control channel as part of a semi-persistent scheduling (SPS) process; and receiving an additional sidelink message indicating the set of time and frequency resources that can be used for the second sidelink message configured for the second RAT.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the set of time and frequency resources includes time and frequency resources for a sidelink feedback channel associated with the second RAT.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first RAT may be LTE and the second RAT may be NR.

[0025] A method of wireless communication at a transmitting device is described. The method may include: determining a sidelink control channel configured for a first RAT; determining a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel; and sending a second sidelink message associated with a second RAT different from the first RAT on the set of time and frequency resources.

[0026] An apparatus for wireless communication at a transmitting device 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: determine a sidelink control channel configured for a first RAT; determine a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel; and send a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT.

[0027] Another apparatus for wireless communication at a transmitting device is described. The apparatus may include components for: determining a sidelink control channel configured for a first RAT; determining a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel; and sending a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT.

[0028] A non-transitory computer-readable medium storing code for wireless communication at a transmitting device is described. The code may include instructions executable by a processor to: determine a sidelink control channel configured for a first RAT; determine a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel; and send a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT.

[0029] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that a first SCS associated with the first RAT may be different from a second SCS associated with the second RAT, wherein based on the first SCS being different from the second SCS, multiple TTIs associated with the second RAT overlap with a single TTI for the sidelink control channel.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the second sidelink message may include operations, features, components, or instructions for sending the second sidelink message in a first TTI of the plurality of TTIs.

[0031] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending the second sidelink message in one or more remaining TTIs of the plurality of TTIs after the first TTI.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, one or more TTIs in the plurality of TTIs following the first TTI may be used by an additional device operating in the second RAT.

[0033] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: determining that the second sidelink message includes a TB spanning two or more of the multiple TTIs; and sending the TB in each of the two or more TTIs.

[0034] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending the second sidelink message in two or more of the plurality of TTIs.

[0035] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending the first sidelink message in the sidelink control channel, the first sidelink message indicating the set of time and frequency resources.

[0036] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the first sidelink message in the sidelink control channel may include operations, features, components, or instructions for sending a field in the first sidelink message in the sidelink control channel indicating the set of time and frequency resources configured for the second RAT.

[0037] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the first sidelink message in the sidelink control channel may include operations, features, components, or instructions for: sending the first sidelink message in the sidelink control channel as part of an SPS process; and sending an additional sidelink message indicating the set of time and frequency resources that can be used for the sidelink message configured for the second RAT.

[0038] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving the first sidelink message in the sidelink control channel.

[0039] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the set of time and frequency resources includes time and frequency resources for a sidelink feedback channel associated with the second RAT.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first RAT may be LTE and the second RAT may be NR. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1

[0026] An example of a wireless communication system that supports sidelink communications using sidelink resource pools configured for different radio access technologies (RATs) in accordance with aspects of the present disclosure is illustrated.

[0042] Figure 2

[0026] An example of a wireless communication system that supports sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is illustrated.

[0043] Figure 3A and Figure 3B Examples of sidelink resource allocation for different RATs in accordance with aspects of the present disclosure are illustrated.

[0044] Figure 4 Illustrated are examples of sidelink resource allocations to support sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure.

[0045] Figure 5 An example of a process flow for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is illustrated.

[0046] Figure 6 and Figure 7A block diagram of an apparatus for supporting sidelink communications using sidelink resource pools configured for different radio access technologies in accordance with aspects of the present disclosure is shown.

[0047] Figure 8 A block diagram of a communications manager that supports sidelink communications using sidelink resource pools configured for different radio access technologies in accordance with aspects of the present disclosure is shown.

[0048] Fig. 9 A diagram of a system including a device that supports sidelink communications using sidelink resource pools configured for different radio access technologies in accordance with aspects of the present disclosure is shown.

[0049] Figures 10 to 16 A flow chart illustrating a method of supporting sidelink communications using sidelink resource pools configured for different radio access technologies in accordance with aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0050] In some wireless communication systems, in order to implement sidelink communication for a first radio access technology (RAT) (e.g., long term evolution (LTE), fourth generation (4G) communication, etc.), a device may send a physical sidelink control channel (PSCCH) to indicate a resource pool (e.g., a set of time and frequency resources) reserved for sidelink communication. Subsequently, the device (e.g., or an additional device) may then use the resource pool to send a sidelink message to a receiving device (e.g., as part of a physical sidelink shared channel (PSSCH)). In some cases (e.g., for LTE), PSCCH and sidelink message / PSSCH may be frequency division multiplexed (FDM) in the same subframe (e.g., PSCCH and PSSCH are sent in the same time resource span but on different frequency resources). However, for sidelink communication in a second RAT (e.g., new radio (NR), fifth generation (5G) communication, etc.), PSCCH and PSSCH may be both FDM and time division duplexed (TDM) in the same subframe (e.g., PSCCH and PSSCH may overlap in time and frequency). Techniques are desirable to accommodate sidelink transmissions configured for a second RAT to occur within a sidelink resource pool that was originally configured for or signaled using a first RAT.

[0051] As described herein, a PSSCH indicated by a PSCCH signaled using a first RAT (e.g., an LTE PSCCH) may be used for sidelink transmissions configured for a second RAT (e.g., an NR PSCCH, an NR PSSCH, an NR sidelink message, etc.). For example, a receiving device (e.g., a receiving UE, a first UE, etc.) may receive a PSCCH associated with a first RAT (e.g., a first sidelink message in the PSCCH), determine a sidelink resource pool indicated by the PSCCH, and then monitor and receive a sidelink message associated with a second RAT (e.g., a second sidelink message) in the sidelink resource pool. In some cases, if a first subcarrier spacing (SCS) used for a PSCCH associated with a first RAT is different from a second SCS used for a sidelink message associated with a second RAT, such that the PSCCH covers more transmission time intervals (TTIs) than would be used for the sidelink message, the excess TTIs may be used by other devices (e.g., for additional NR communications), may be used for retransmissions, may be used for transport blocks (TBs) spanning multiple slots, or may be aggregated (e.g., to combine multiple instances of a sidelink message to fully receive and decode the sidelink message).

[0052] Additionally or optionally, the same device (e.g., the same transmitting device, the same UE, the second UE, etc.) that transmits the PSCCH associated with the first RAT may transmit a sidelink message associated with the second RAT. Optionally, the first device (e.g., the first transmitting device, the second UE, etc.) may transmit the PSCCH associated with the first RAT, and the second device (e.g., the second transmitting device, the third UE, etc.) may transmit the sidelink message associated with the second RAT. In some embodiments, a field in the PSCCH may indicate that a sidelink resource pool (e.g., reserved sidelink resources) may be used for communications (e.g., sidelink messages) associated with the second RAT. Additionally or optionally, in a first PSCCH associated with the first RAT of a semi-persistent scheduling (SPS) process, a device (e.g., a transmitting device, a transmitting UE, etc.) may transmit a first sidelink message associated with the second RAT, the first sidelink message indicating which resources may be used for NR sidelink transmissions.

[0053] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Additionally or alternatively, various aspects of the present disclosure are illustrated by additional wireless communication systems, examples of sidelink resource allocation, and process flows. Various aspects of the present disclosure are further illustrated and described by reference to apparatus diagrams, system diagrams, and flow charts involving sidelink communications using sidelink resource pools configured for different RATs.

[0054] Figure 1 An example of a wireless communication system 100 that supports sidelink communications using sidelink resource pools configured for different RATs in accordance with various aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be an LTE network, an LTE Advanced (LTE-A) network, an LTE-A Pro network, or an NR network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof, and the like.

[0055] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may be devices of different forms or 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 in which the base stations 105 and the UEs 115 may support communication of signals according to one or more RATs.

[0056] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be fixed or mobile, or fixed or mobile at different times. The UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0057] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 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 via the backhaul links 120 (e.g., via X2, Xn, or other interfaces) directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

[0058] 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 station transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga-NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology.

[0059] 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 terminology, 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, and other examples, which may be implemented in various objects such as home appliances or vehicles, meters, and other examples.

[0060] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that can sometimes act as relays, as well as base stations 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 shown.

[0061] The UE 115 and the base station 105 can communicate with each other wirelessly via one or more communication links 125 over one or more carriers. The term "carrier" can refer to a set of radio spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, the carrier used for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels of a given RAT (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 operations for carriers, 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 with multiple downlink component carriers and one or more uplink component carriers according to the carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0062] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operation for 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 raster for discovery by a UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by a UE 115 via the carrier, or a carrier may operate in a non-standalone mode, where a different carrier (e.g., with the same or different RAT) is used to anchor the connection.

[0063] 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 FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0064] 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 a plurality of determined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier for a particular RAT. Devices (e.g., base stations 105, UEs 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communications over a particular carrier bandwidth, or may be configured to support communications over one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate over a portion (e.g., subband, BWP) or all of a carrier bandwidth.

[0065] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM technology, a resource element may be composed of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate of the UE 115 may be. Wireless communication resources may refer to a combination of radio 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 communications with the UE 115.

[0066] One or more numerologies for a carrier may be supported, where the numerologies may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different numerologies. 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 of the UE 115 may be limited to one or more active BWPs.

[0067] The time interval for the base station 105 or the UE 115 may be expressed as a multiple of a basic time unit, which may be, for example, T s =1 / (Δf max ·N f ) seconds sampling period, where Δf max It can represent the maximum supported subcarrier spacing, and N f The 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., in the range of 0 to 1023.

[0068] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into multiple time slots. Optionally, 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 multiple symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In some wireless communication systems 100, the time slot may be further divided into multiple micro-time slots containing one or more symbols. In addition to the cyclic prefix, each symbol period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0069] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0070] 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 over 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 UEs 115 may monitor or search for 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 of one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the 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 .

[0071] In some examples, the base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different RATs.

[0072] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automatic 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 a device that integrates sensors or meters to measure or capture information and forward such information to a central server or application that utilizes the information or presents the information to a human interacting with the application. Some UEs 115 may be designed to collect information or implement automatic behavior of a machine or other device. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0073] The wireless communication system 100 can be configured to support ultra-reliable communication or low latency communication or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private communication or group communication, and can 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 can include service prioritization, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency are used interchangeably herein.

[0074] In some examples, UE 115 can also communicate directly with other UE 115 via 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 can be within the geographic coverage area 110 of the base station 105. Other UEs 115 in this group can be outside the geographic coverage area 110 of the base station 105, or otherwise unable to receive transmissions from the base station 105. In some examples, a group of UEs 115 communicating via D2D communication can utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0075] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in the V2X system can communicate with roadside infrastructure such as roadside units, or with the network, or both via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication.

[0076] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection and other access, routing or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which 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 interconnections to an external network. The control plane entity may manage non-access stratum (NAS) functions associated with the core network 130 for UE 115 served by the base station 105, such as mobility, authentication and bearer management. User IP packets may be delivered through a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the IP service 150 of the network operator. Operator IP services 150 may include access to the Internet, Intranet(s), IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0077] Certain 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 UE 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transmission entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs), or merged into a single network device (e.g., base station 105).

[0078] The wireless communication system 100 may operate using one or more frequency bands, e.g., in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band, because the wavelengths range from approximately 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but the waves may sufficiently penetrate the structures used for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0079] The wireless communication system 100 can utilize both licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can employ licensed assisted access (LAA), LTE-unlicensed (LTE-U) RAT, 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 can employ carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands can be based on carrier aggregation configurations (e.g., LAA) in conjunction with component carriers operating in licensed bands. Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0080] The base station 105 or UE 115 may be equipped with multiple antennas that 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 in different geographical locations. The base station 105 may have an antenna array with multiple rows and columns of antenna ports that the base station 105 may 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 optionally, the antenna panel may support radio frequency beamforming of signals sent via the antenna ports.

[0081] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can 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 can be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted 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 direction (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other direction).

[0082] The wireless communication system 100 can be a packet-based network operated according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be based on IP. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate on the logical channel. The media access control (MAC) layer can perform priority processing and multiplex the logical channel into the transport channel. The MAC layer can also use error detection technology, error correction technology or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the UE 115 and the base station 105 or the core network 130 supporting the radio bearer of the user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0083] UE 115 and base station 105 can support retransmission of data to increase the possibility that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique that increases the possibility of correctly receiving data through communication link 125. HARQ can 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 can improve the throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device can support HARQ feedback for the same time slot, wherein the device can provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device can provide HARQ feedback in a subsequent time slot or according to some other time intervals.

[0084] In some wireless communication systems, a first UE may communicate directly with a second UE via a sidelink communication. In order to implement sidelink communication for LTE communication (e.g., a first RAT), the first UE may send a PSCCH to indicate a resource pool (e.g., a set of time and frequency resources) reserved for sidelink communication. Subsequently, the first UE (e.g., or an additional transmitting device) may then use the resource pool to send a sidelink message (e.g., as part of the PSSCH) to the second UE (e.g., a receiving device). In some cases (e.g., for LTE), the PSCCH and sidelink message / PSSCH may be FDMed in the same subframe (e.g., PSCCH and PSSCH are sent in the same time resource span but on different frequency resources). However, for sidelink communication in NR communication (e.g., a second RAT), the PSCCH and PSSCH may be FDMed and TDMed in the same subframe (e.g., PSCCH and PSSCH may overlap in time and frequency). It is desirable to be able to transmit NR sidelink messages within the LTE sidelink resource pool.

[0085] The wireless communication system 100 can support an efficient technique for sending a sidelink message associated with a second RAT different from the first RAT using a resource pool originally reserved for the first RAT. For example, a sidelink shared channel (e.g., PSSCH) indicated by a PSCCH (e.g., a first sidelink message in a PDSCCH) signaled using a first RAT (e.g., LTE PSCCH) can be used for a sidelink transmission (e.g., a second sidelink message) configured for a second RAT (e.g., NR PSCCH, NR PSSCH, NR sidelink message, etc.). In some embodiments, the same device (e.g., the same transmitting device, the same UE, a second UE, etc.) that sends the PSCCH associated with the first RAT can send the sidelink transmission associated with the second RAT, or different devices can send the PSCCH associated with the first RAT and the sidelink transmission associated with the second RAT, respectively. Additionally or alternatively, the set of time and frequency resources may be indicated as being available for the second RAT via a field in the sidelink control channel or via an additional sidelink message associated with the second RAT sent using the sidelink control channel. Additional techniques may be designed and implemented for situations where the first RAT and the second RAT use different SCSs.

[0086] Figure 2 An example of a wireless communication system 200 that supports sidelink communications using sidelink resource pools configured for different RATs according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. For example, the wireless communication system 200 can include a first UE 115-a and a second UE 115-b, which can be represented as shown in reference Figure 1 An example of a corresponding UE 115 is described. Additionally or alternatively, the first UE 115-a and the second UE 115-b can support sidelink communications with each other or with other UEs 115. As shown, the first UE 115-a and the second UE 115-b can communicate with each other on resources of the carrier 205 (e.g., via sidelink communications).

[0087] In some cases, the first UE 115-a and the second UE 115-b can support communications associated with a first RAT (e.g., LTE), a second RAT (e.g., NR), or both RATs. For example, the two UEs 115 can be configured to communicate with the second RAT, where communication with the first RAT is backward compatible based on the configuration for communicating with the second RAT.

[0088] For sidelink communications associated with the first RAT, resources may be reserved and indicated in a sidelink control channel associated with the first RAT, where the indicated resources are then used to communicate sidelink messages between UEs 115. Additionally or alternatively, the sidelink control channel may be sent on a first set of time and frequency resources, and the resources indicated by the sidelink control channel may be located on a second set of time and frequency resources that occur during the same duration as the first set of time and frequency resources (e.g., the sidelink control channel and the resources are FDMed, where each occurs on the same set of time resources but on different frequencies).

[0089] For sidelink communications associated with a second RAT, the sidelink control channel associated with the second RAT may also indicate resources that may be used for communication of sidelink messages associated with the second RAT. However, the sidelink control channel and the indicated resources may occupy overlapping time and frequency resources (e.g., the sidelink control channel and the resources are both TDM and FDM, each occurring on at least a subset of the same time resources and a subset of the same frequency resources). Compatibility between sidelink communications on different RATs may be affected based on different RATs using different resources for sidelink communications relative to the sidelink control channel associated with the corresponding RAT indicating the resources.

[0090] As described herein, techniques are described for enabling sidelink transmissions associated with a second RAT to occur within a sidelink resource pool (e.g., indicated resources) that was originally associated with a first RAT. For example, a sidelink control channel 210 (e.g., PSCCH) may be associated with a first RAT (e.g., LTE). A first sidelink message transmitted in the sidelink control channel 210 may indicate a resource pool 215 that may be used for sidelink communications that are also associated with the first RAT. For example, a resource pool 215 may represent a set of time and frequency resources reserved for sidelink communications associated with the first RAT. In some cases, the resource pool 215 may be used for a sidelink shared channel (e.g., PSSCH) associated with the first RAT. However, the UE 115 may not use the resource pool 215 for sidelink communications associated with the first RAT.

[0091] Thus, the UE 115 may replace the use of the resource pool 215 for the sidelink shared channel associated with the first RAT with the use of the resource pool 215 for the sidelink transmission or sidelink message associated with the second RAT. That is, the first sidelink message transmitted in the sidelink control channel 210 associated with the first RAT may reserve a set of time and frequency resources of the resource pool 215 for the first RAT in a backward compatible manner (e.g., the set of time and frequency resources indicated by the sidelink control channel 210 associated with the first RAT may be used for sidelink communications associated with the first RAT or the second RAT). For example, the resource pool 215 may be used for the sidelink shared channel associated with the first RAT, or may be used for the sidelink control channel 220 and the sidelink shared channel 225 associated with the second RAT. Additionally or alternatively, the first sidelink message transmitted in the sidelink control channel 210 may reserve a first set of time and frequency resources for communications associated with the first RAT, and may reserve a second set of time and frequency resources for communications associated with the second RAT, wherein the first set of time and frequency resources and the second set of time and frequency resources may be the same or different.

[0092] Additionally or alternatively, at least a portion of the set of time and frequency resources included in the resource pool 215 can be used for a sidelink feedback channel 230 associated with the second RAT (e.g., a physical sidelink feedback channel (PSFCH)). For example, the UE 115 can use the sidelink feedback channel 230 to transmit confirmation feedback, signal measurements, channel quality indicators, etc. regarding sidelink communications associated with the second RAT.

[0093] In some embodiments, a field in a first sidelink message transmitted in a sidelink control channel 210 associated with a first RAT may indicate that a set of time and frequency resources (e.g., reserved resources) of a resource pool 215 are used for sidelink communications associated with a second RAT (e.g., a sidelink control channel 220, a sidelink shared channel 225, a sidelink feedback channel 230, etc., each associated with the second RAT). For example, the field in the first sidelink message transmitted in a sidelink control channel 210 associated with the first RAT may be a reserved bit in the first sidelink message (e.g., in the sidelink control channel 210).

[0094] Additionally or alternatively, in a first sidelink control channel (e.g., in a first sidelink message) associated with a first RAT (e.g., LTE PSCCH) sent as part of an SPS process (e.g., multiple sidelink control channels may be sent based on periodic scheduling of the SPS process), the transmitting UE 115 may also send a sidelink message (e.g., an additional sidelink message) associated with a second RAT (e.g., LTE PSCCH) indicating which resources may be used for sidelink communications (e.g., NR sidelink transmissions) associated with the second RAT. In some embodiments, the resources indicated in the sidelink message associated with the second RAT may be allocated to different UEs 115. Additionally or alternatively, a sensing and resource selection process associated with the second RAT may be applied to the resources indicated in the sidelink message.

[0095] In some embodiments, the UE 115 (e.g., or an additional UE 115 supporting communications associated with the second RAT, such as the NR UE 115) may process a first sidelink message received in a sidelink control channel 210 associated with the first RAT to avoid resource conflicts. For example, before using a set of time and frequency resources included in a resource pool 215, the UE 115 may process the first sidelink message received in a sidelink control channel 210 associated with the first RAT to identify a set of time and frequency resources and to identify whether the resources are being used for sidelink communications associated with the first RAT. Additionally or alternatively, transmission of the sidelink control channel 210 associated with the first RAT may be disabled, and the UE 115 may use the resource pool 215 for sidelink communications associated with the second RAT without identifying the use of resources of the sidelink control channel 210 associated with the first RAT.

[0096] Additionally or alternatively, the same UE 115 that sends the first sidelink message in the sidelink control channel 210 associated with the first RAT may send sidelink communications (e.g., a second sidelink message) associated with a second RAT (e.g., a sidelink control channel 220, a sidelink shared channel 225, a sidelink feedback channel 230, etc.). Alternatively, an additional UE 115 may send the first sidelink message in the sidelink control channel 210 associated with the first RAT, and a different UE 115 may send sidelink communications (e.g., a second sidelink message) associated with the second RAT. For example, UE 115 may send a first sidelink message in a sidelink control channel 210 associated with a first RAT indicating a resource pool 215 that may be used for sidelink communications associated with a second RAT, and a different UE 115 may receive the indication of resource pool 215 by receiving the first sidelink message in the sidelink control channel 210 and may then use resource pool 215 to send sidelink communications associated with the second RAT.

[0097] Figure 3A and Figure 3B Examples of sidelink resource allocations 300 and 301 according to aspects of the present disclosure are illustrated. In some examples, the sidelink resource allocations 300 and 301 can implement aspects of the wireless communication systems 100 and 200. For example, two or more UEs 115 can communicate with each other over a sidelink connection using the sidelink resource allocations 300 and 301. Each sidelink resource allocation can include a sidelink control channel for transmitting control information between the UEs 115 and a sidelink shared channel for transmitting sidelink messages between the UEs 115.

[0098] The sidelink resource allocation 300 may represent a configuration associated with a first RAT. For example, the sidelink resource allocation 300 may be used for sidelink communications associated with LTE (e.g., LTE V2X communications). Additionally or alternatively, the sidelink resource allocation 300 may include a sidelink control channel 305 associated with the first RAT (e.g., LTE PSCCH) and a sidelink shared channel 310 associated with the first RAT (e.g., LTE PSSCH), wherein the sidelink control channel 305 and the sidelink shared channel 310 are FDMed in the same subframe (e.g., or TTIs of different lengths). In some cases, the sidelink control channel 305 may indicate resources reserved for the sidelink shared channel 310, so that the UE 115 can receive and decode the sidelink control channel 305 to identify resources (e.g., additional control information) to then use the sidelink shared channel 310 for sidelink communications. Additionally or alternatively, the sidelink resource allocation 300 may use a DFT spread (DFT) waveform with a first SCS (e.g., a 15kHz SCS). In some cases, separate DFT and reference signals may be used for the sidelink control channel 305 and the sidelink shared channel 310. Additionally or alternatively, the sidelink control channel 305 and the sidelink shared channel 310 may not be adjacent in frequency.

[0099] In some cases, the sidelink control channel 305 may span two (2) physical resource blocks (PRBs). Additionally or alternatively, the subchannel size for the sidelink resource allocation 300 may depend on whether the sidelink control channel 305 and the sidelink shared channel 310 are adjacent in frequency. For example, if the sidelink control channel 305 and the sidelink shared channel 310 are adjacent in frequency, the sidelink resource allocation 300 may span one of a first set of PRB quantities, such as {5, 6, 10, 15, 20, 25, 50, 75, 100} PRBs. Alternatively, if the sidelink control channel 305 and the sidelink shared channel 310 are not adjacent in frequency, the sidelink resource allocation 300 may span one of a second set of PRB quantities, such as {4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 30, 48, 72, 96} PRBs.

[0100] For a sidelink resource allocation 300 associated with a first RAT, resource reservations (e.g., resources indicated by a sidelink control channel 305 of a sidelink shared channel 310) may be periodic, with at most two (2) retransmissions in a period. For example, a period value for resource reservation may include {20-50, 100, 200, ..., 1000} ms. Additionally or alternatively, the sidelink resource allocation 300 may not include resources that may be used for feedback transmissions. In some cases, in order to select resources for the sidelink shared channel 310, the UE 115 may perform signal measurements (e.g., reference signal received power (RSRP) measurements) on a reference signal (e.g., a demodulation reference signal (DMRS)) sent / received on the sidelink shared channel 310.

[0101] The sidelink resource allocation 301 may represent a configuration associated with a second RAT. For example, the sidelink resource allocation 301 may be used for sidelink communications associated with NR (e.g., NR V2X communications). Additionally or alternatively, the sidelink resource allocation 301 may include a sidelink control channel 315 (e.g., NR PSCCH) associated with the second RAT and a sidelink shared channel 320 (e.g., NR PSSCH) associated with the second RAT, wherein the sidelink control channel 315 and the sidelink shared channel 320 are FDMed and TDMed in the same subframe (e.g., or TTIs of different lengths). Additionally or alternatively, the sidelink resource allocation 301 may use a cyclic prefix OFDM (CP-OFDM) waveform that is used with a variable SCS (e.g., 15, 30, 60, 120, etc. kHz SCS), and separate reference signals may be used for the sidelink control channel 315 and the sidelink shared channel 320, respectively.

[0102] In some cases, the sidelink control channel 315 may span 10, 12, 15, 20, or 25 PRBs and two (2) or (3) OFDM symbols. Additionally or alternatively, the sidelink resource allocation 301 may include a subchannel size of 10, 12, 15, 20, 25, 50, 75, or 100 RBs. In some cases, the resource reservation (e.g., the resources indicated by the sidelink control channel 315 of the sidelink shared channel 320) may be aperiodic or periodic, with up to 32 retransmissions. For periodic resource reservation, the period value may include {1:100, 200, ..., 1000} ms. Additionally or alternatively, the sidelink resource allocation 301 may include feedback that may be sent on a sidelink feedback channel (e.g., PSFCH) of the sidelink shared channel 320. In some cases, the sidelink feedback channel may be enabled or disabled. Additionally or optionally, in order to select resources for the sidelink shared channel 320, the UE 115 may perform signal measurements (e.g., RSRP measurements) on a reference signal (e.g., a demodulation reference signal (DMRS)) sent / received on the sidelink control channel 315 or the sidelink shared channel 320.

[0103] Figure 4 An example of a sidelink resource allocation 400 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is illustrated. In some examples, the sidelink resource allocation 400 can implement aspects of the wireless communication systems 100 and 200. For example, two (2) UEs 115 can communicate with each other over a sidelink connection using the sidelink resource allocation 400. Additionally or alternatively, as described herein, the sidelink resource allocation 400 can include a sidelink control channel 405 (e.g., a PSCCH, a first sidelink message in the PSCCH, etc.) associated with a first RAT (e.g., LTE) indicating a resource pool 410 of a set of time and frequency resources reserved for sidelink communications, wherein the resource pool 410 can be used for sidelink communications (e.g., a second sidelink message) associated with a second RAT (e.g., NR) different from the first RAT. That is, the UE 115 may use the resource pool 410 to transmit one or more sidelink messages associated with the second RAT, such as a sidelink control channel 415 (e.g., PSCCH) for the second RAT and a sidelink shared channel 420 (e.g., PSSCH) for the second RAT.

[0104] However, in some embodiments, communications associated with the first RAT (e.g., sidelink control channel 405) and communications associated with the second RAT (e.g., sidelink control channel 415 and sidelink shared channel 420) may include different SCSs from each other, thereby affecting the use of resource pool 410 for communications associated with the second RAT. For example, communications associated with the first RAT may include a first SCS (e.g., 15kHz SCS), while communications associated with the second RAT may include a second SCS (e.g., 30kHz SCS). Based on the different SCSs, multiple time slots for the second RAT may overlap with a single time slot for the first RAT. For example, as shown, communications with the first RAT may occur over a time slot 425 (e.g., an LTE time slot) for the first RAT, and within the time slot 425, multiple time slots 430 (e.g., NR time slots) for the second RAT may occur, such as a first time slot 430-a for the second RAT and a second time slot 430-b for the second RAT. The resource pool 410 indicated by the sidelink control channel 405 may be reserved for the entire time slot 425 of the first RAT, but because multiple time slots 430 of the second RAT occur within the time slot 425, the UE 115 may not know which time slot 430 is used for sidelink communications associated with the second RAT, or how to use any remaining time slots 430 after sidelink communications associated with the second RAT have occurred.

[0105] As shown, the UE 115 may determine to use the first time slot 430-a for sidelink communications associated with the second RAT (e.g., the sidelink control channel 415 and the sidelink shared channel 420). Additionally or alternatively, the UE 115 may determine to use a different time slot 430 than the first time slot 430-a. Once the sidelink communications associated with the second RAT are completed, the second time slot 430-b may still be reserved within the resource pool 410. Thus, the UE 115 may have different options for how to use the second time slot 430-b.

[0106] In some embodiments, the second time slot 430-b (e.g., any additional time slots 430 after sidelink communication has occurred) can be used by other UEs 115 (e.g., in addition to the two (2) UEs 115 that use the first time slot 430-a for sidelink communication). Additionally or optionally, the second time slot 430-b (e.g., and any additional time slots 430) can be used by the same UE 115 that sent the (multiple) sidelink message in the first time slot 430-a (e.g., for (multiple) retransmissions of the (multiple) sidelink message). In other embodiments, the second time slot 430-b (e.g., and any additional time slots 430) can be used where the TB spans multiple time slots (e.g., the sending UE 115 uses a TB spanning multiple time slots 430 to send the sidelink message). Additionally or alternatively, the second time slot 430-b (e.g., and any additional time slots 430) may be aggregated by the receiving UE 115 to fully receive and decode the sidelink message sent by the sending UE 115. For example, the sending UE 115 may send the sidelink message using multiple instances of the sidelink message in the corresponding time slot 430, where each instance of the sidelink message is sent based on a redundancy version (RV) cycle (e.g., each instance of the sidelink message is sent with a different RV), and the receiving UE 115 may aggregate or combine the multiple instances of the sidelink message over the multiple time slots 430 to fully receive and decode the sidelink message. In some embodiments, the second time slot 430-b (e.g., and any additional time slots 430) may be empty and not used by any UE 115.

[0107] Figure 5 An example of a process flow 500 for supporting sidelink communications using sidelink resource pools configured for different radio access technologies in accordance with aspects of the present disclosure is illustrated. In some examples, the process flow 500 may implement aspects of wireless communication systems 100 and 200. For example, the process flow 500 may include UE 115-c and UE 115-d, which may be represented as shown in reference Figures 1 to 4 The described example corresponds to UE 115. Additionally or alternatively, UE 115-c and UE 115-d may support sidelink communications with each other.

[0108] In the following description of process flow 500, operations between UE 115-c and UE 115-d may be performed in a different order or at a different time. Some operations may also be omitted from process flow 500, or other operations may be added to process flow 500. It should be understood that although UE 115-c and UE 115-d are shown as performing multiple operations of process flow 500, any wireless device may perform the operations shown.

[0109] At 505, UE 115-c and UE 115-d may determine a sidelink control channel (e.g., PSCCH) configured for a first RAT (e.g., LTE). For example, in some implementations, UE 115-c may receive the sidelink control channel.

[0110] At 510, UE 115-d may receive a first sidelink message in a sidelink control channel configured for the first RAT. For example, UE 115-c (e.g., or another UE 115) may send the first sidelink message in the sidelink control channel to UE 115-d.

[0111] At 515, UE 115-c and UE 115-d may determine a set of time and frequency resources indicated by a first sidelink message transmitted in a sidelink control channel. In some embodiments, the first sidelink message in the sidelink control channel may include a field indicating that the set of time and frequency resources may be associated with a second RAT (e.g., different from the first RAT, such as NR). Additionally or alternatively, the first sidelink message in the sidelink control channel may be sent as part of an SPS procedure, and an additional sidelink message may be sent as part of the SPS procedure with the sidelink control channel, wherein the additional sidelink message indicates that the set of time and frequency resources is associated with the second RAT. In some embodiments, the set of time and frequency resources may include time and frequency resources for a sidelink feedback channel (e.g., PSFCH) associated with the second RAT.

[0112] At 520, UE 115-c and UE 115-d may determine that a first SCS associated with the first RAT is different from a second SCS associated with the second RAT, wherein a plurality of TTIs associated with the second RAT overlap with a single TTI for a sidelink control channel based on the first SCS being different from the second SCS. In some embodiments, one or more TTIs in the plurality of TTIs after the first TTI are used by an additional device operating in the second RAT.

[0113] At 525, UE 115-d may monitor a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. If the SCS is different for the first and second RATs, respectively, UE 115-d may monitor the second sidelink message in a first TTI of the plurality of TTIs. In some embodiments, UE 115-d may monitor retransmissions of the second sidelink message in one or more remaining TTIs of the plurality of TTIs after the first TTI. Additionally or alternatively, UE 115-d may determine that the second sidelink message includes a TB spanning two or more TTIs of the plurality of TTIs, and may monitor the TB in each of the two or more TTIs. In some embodiments, UE 115-d may determine that the second sidelink message is sent in two or more TTIs of the plurality of TTIs, and may monitor the second sidelink message in each of the two or more TTIs, wherein UE 115-d may combine each instance of the sidelink message received from the two or more TTIs. For example, the second sidelink message may be sent in two or more TTIs based on the RV cycle configuration.

[0114] At 530, UE 115-c may send a second sidelink message associated with a second RAT on the set of time and frequency resources (e.g., in a first TTI of multiple TTIs, utilizing retransmissions, utilizing a TB spanning multiple TTIs, utilizing different instances in corresponding TTIs configured using an RV cycle, etc.). In some embodiments, UE 115-c (e.g., the same transmitting device) may send both the first sidelink message and the second sidelink message in a sidelink control channel. Alternatively, a different UE 115 (e.g., a first transmitting device) may send the first sidelink message in the sidelink control channel, and UE 115-c (e.g., a second transmitting device) may send the second sidelink message on the set of time and frequency resources indicated by the first sidelink message, which was transmitted in a sidelink control channel sent by a different UE 115.

[0115] Figure 6A block diagram 600 of a device 605 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with various aspects of the present disclosure is illustrated. The device 605 may be an example of various aspects of a UE 115 as described herein. Additionally or alternatively, in some embodiments, the device 605 may operate as a receiving device, as a transmitting device, or as both a receiving and transmitting device. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may communicate with each other directly or indirectly (e.g., via one or more buses).

[0116] The receiver 610 may receive control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink communications using sidelink resource pools configured for different RATs, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The receiver 610 may utilize a single antenna or a collection of antennas.

[0117] When the device 605 operates as a receiving device (e.g., or a device that both transmits and receives), the communication manager 615 can receive a first sidelink message in a sidelink control channel configured for a first RAT. In some embodiments, the communication manager 615 can determine a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel. The communication manager 615 can then monitor the set of time and frequency resources for a second sidelink message associated with a second RAT, the second RAT being different from the first RAT.

[0118] When the device 605 operates as a transmitting device (e.g., or a device that both transmits and receives), the communication manager 615 can determine a sidelink control channel configured for a first RAT. Additionally or alternatively, the communication manager 615 can determine a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel. Subsequently, the communication manager 615 can send a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. The communication manager 615 can be an example of various aspects of the communication manager 910 described herein.

[0119] The communication manager 615 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 communication manager 615 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0120] The communication manager 615 or its subcomponents can be physically located in a variety of 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 communication manager 615 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can 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.

[0121] In some examples, the communication manager 615 can be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 610 and transmitter 620 can be implemented as analog components (e.g., amplifiers, filters, antennas) coupled with the mobile device modem to enable wireless transmission and reception on one or more frequency bands.

[0122] The communication manager 615 described herein may be implemented to achieve one or more potential advantages. One embodiment may allow the device 605 to more efficiently use sidelink resources for communications with a second device. For example, rather than having resources configured and used for a single RAT, the device 605 may use resources originally associated with the first RAT for communications associated with the second RAT. Therefore, these resources that may not have been used for the first RAT are now available for communications associated with the second RAT, resulting in more efficient use of resources.

[0123] Transmitter 620 can transmit signals generated by other components of device 605. In some examples, transmitter 620 can be collocated with receiver 610 in a transceiver module. For example, transmitter 620 can be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The transmitter 620 may utilize a single antenna or a collection of antennas.

[0124] Figure 7A block diagram 700 of a device 705 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with various aspects of the present disclosure is illustrated. The device 705 may be an example of various aspects of the device 605 or UE 115 as described herein. Additionally or alternatively, in some embodiments, the device 705 may operate as a receiving device, as a transmitting device, or as both a receiving and transmitting device. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 735. The device 705 may also include a processor. Each of these components may communicate with each other directly or indirectly (e.g., via one or more buses).

[0125] The receiver 710 may receive control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink communications using sidelink resource pools configured for different RATs, etc.). The information may be passed to other components of the device 705. The receiver 610 may be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The receiver 710 may utilize a single antenna or a collection of antennas.

[0126] Communications manager 715 may be an example of aspects of communications manager 615 described herein. Communications manager 715 may include first RAT sidelink component 720, sidelink resource determination component 725, and second RAT sidelink component 730. Communications manager 715 may be an example of aspects of communications manager 910 described herein.

[0127] When the device 705 operates as a receiving device (eg, or a device that both receives and transmits), the first RAT sidelink component 720 may receive the first sidelink message in a sidelink control channel configured for the first RAT.

[0128] When the device 705 operates as a receiving device, the sidelink resource determining component 725 can determine the set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel.

[0129] When the device 705 operates as a receiving device, the second RAT sidelink component 730 can monitor the set of time and frequency resources for a second sidelink message associated with a second RAT that is different than the first RAT.

[0130] When the device 705 operates as a transmitting device (eg, or a device that both receives and transmits), the first RAT sidelink component 720 can determine a sidelink control channel configured for the first RAT.

[0131] When the device 705 operates as a transmitting device, the sidelink resource determining component 725 can determine the set of time and frequency resources indicated by the first sidelink message in the sidelink control channel.

[0132] When the device 705 operates as a transmitting device, the second RAT sidelink component 730 can transmit a second sidelink message associated with a second RAT different from the first RAT on the set of time and frequency resources.

[0133] Based on transmitting a sidelink message associated with the second RAT as described herein using the set of time and frequency resources originally configured for the first RAT, the processor of the UE 115 (e.g., as described with reference to Fig. 9 The described control receiver 710, transmitter 735 or transceiver 920) can reduce signaling complexity and overhead and reduce latency. For example, the processor can utilize a set of time and frequency resources originally associated with the first RAT to transmit a sidelink message associated with the second RAT, rather than determining a set of time and frequency resources reserved specifically for the second RAT, thereby reducing signaling for determining a specific set of time and frequency resources for the second RAT, and being able to transmit the sidelink message with less latency.

[0134] Transmitter 735 can transmit signals generated by other components of device 705. In some examples, transmitter 735 can be collocated with receiver 710 in a transceiver module. For example, transmitter 735 can be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The transmitter 735 can utilize a single antenna or a collection of antennas.

[0135] Figure 8 A block diagram 800 of a communication manager 805 is shown that supports sidelink communications using sidelink resource pools configured for different radio access technologies in accordance with various aspects of the present disclosure. In some implementations, the communication manager 805 may be part of a receiving device or a transmitting device in the context described herein. The communication manager 805 may be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 may include a first RAT sidelink component 810, a sidelink resource determination component 815, a second RAT sidelink component 820, an SCS determination component 825, a multi-TTI sidelink component 830, a sidelink message transmission block component 835, a multi-sidelink instance component 840, a sidelink resource indication component 845, and a second RAT SCS component 850. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0136] When the communication manager 805 is part of a receiving device, the first RAT sidelink component 810 can receive the first sidelink message in a sidelink control channel configured for the first RAT. In some examples, the first RAT sidelink component 810 can receive the first sidelink message in the sidelink control channel from the first transmitting device.

[0137] When the communication manager 805 is part of a transmitting device, the first RAT sidelink component 810 can determine a sidelink control channel configured for the first RAT. In some embodiments, the first RAT sidelink component 810 can send a first sidelink message in the sidelink control channel, the first sidelink message indicating a set of time and frequency resources. Optionally, the first RAT sidelink component 810 can receive the first sidelink message in the sidelink control channel.

[0138] When the communication manager 805 is part of a receiving device, the sidelink resource determining component 815 can determine a set of time and frequency resources indicated by a first sidelink message received in a sidelink control channel. In some cases, the set of time and frequency resources can include time and frequency resources for a sidelink feedback channel associated with a second RAT.

[0139] When the communication manager 805 is part of a transmitting device, the sidelink resource determining component 815 can determine a set of time and frequency resources indicated by the first sidelink message in the sidelink control channel. In some cases, the set of time and frequency resources can include time and frequency resources for a sidelink feedback channel associated with the second RAT.

[0140] When the communication manager 805 is part of a receiving device, the second RAT sidelink component 820 can monitor a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. In some examples, the second RAT sidelink component 820 can receive a first sidelink message and a second sidelink message in a sidelink control channel from the same transmitting device. Optionally, the second RAT sidelink component 820 can receive a second sidelink message from a second transmitting device. In some cases, the first RAT can be LTE and the second RAT can be NR.

[0141] When the communication manager 805 is part of a transmitting device, the second RAT sidelink component 820 can send a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. In some cases, the first RAT can be LTE and the second RAT can be NR.

[0142] When the communication manager 805 is part of a receiving device or a transmitting device, the SCS determination component 825 can determine that a first SCS associated with a first RAT is different from a second SCS associated with a second RAT, wherein based on the first SCS being different from the second SCS, multiple TTIs configured for the second RAT overlap with a single TTI for a sidelink control channel.

[0143] When the communication manager 805 is part of a receiving device, the multi-TTI sidelink component 830 can monitor the second sidelink message in a first TTI of the plurality of TTIs. In some examples, the multi-TTI sidelink component 830 can monitor retransmissions of the second sidelink message in one or more remaining TTIs of the plurality of TTIs after the first TTI. Additionally or alternatively, one or more TTIs of the plurality of TTIs after the first TTI can be used by an additional device operating in a second RAT.

[0144] When the communication manager 805 is part of a receiving device, the sidelink message transmission block component 835 can determine that the second sidelink message includes a transmission block spanning two or more TTIs in a plurality of TTIs, and can monitor the transmission blocks in each of the two or more TTIs.

[0145] When the communication manager 805 is part of a transmitting device, the sidelink message transmission block component 835 can determine that the second sidelink message includes a transmission block spanning two or more TTIs of the multiple TTIs, and can send the transmission block in each TTI of the two or more TTIs.

[0146] When the communication manager 805 is part of a receiving device, the multi-sidelink instance component 840 can determine to send a second sidelink message in two or more TTIs of the plurality of TTIs, and can monitor the second sidelink message in each of the two or more TTIs, wherein the receiving device can combine each received instance of the sidelink message from the two or more TTIs. In some cases, the second sidelink message can be sent in two or more TTIs based on the RV cycle configuration.

[0147] When the communication manager 805 is part of a receiving device, the sidelink resource indicating component 845 can receive a field in the first sidelink message in a sidelink control channel indicating a set of time and frequency resources configured for the second RAT. Additionally or alternatively, the sidelink resource indicating component 845 can receive the first sidelink message in the sidelink control channel as part of an SPS procedure and can receive an additional sidelink message indicating a set of time and frequency resources that can be used for a second sidelink message configured for the second RAT.

[0148] When the communication manager 805 is part of a transmitting device, the sidelink resource indicating component 845 can transmit a field in the first sidelink message indicating a set of time and frequency resources configured for the second RAT in the sidelink control channel. Additionally or alternatively, the sidelink resource indicating component 845 can transmit the first sidelink message in the sidelink control channel as part of the SPS procedure and can transmit an additional sidelink message indicating a set of time and frequency resources that can be used for the sidelink message configured for the second RAT.

[0149] When the communication manager 805 is part of a transmitting device, the second RAT SCS component 850 may transmit the second sidelink message in a first TTI in the plurality of TTIs. In some examples, the second RAT SCS component 850 may transmit a retransmission of the second sidelink message in one or more remaining TTIs in the plurality of TTIs after the first TTI. Additionally or alternatively, the second RAT SCS component 850 may transmit the second sidelink message in two or more TTIs in the plurality of TTIs. In some cases, one or more TTIs in the plurality of TTIs after the first TTI may be used by an additional device operating in the second RAT.

[0150] Fig. 9 A diagram of a system 900 including a device 905 that supports sidelink communications using sidelink resource pools configured for different radio access technologies in accordance with various aspects of the present disclosure is shown. The device 905 may be an example of a device 605, a device 705, or a UE 115 described herein or include a component of the device 605, the device 705, or the UE 115. Additionally or alternatively, in some embodiments, the device 905 may operate as a receiving device, as a transmitting device, or as both a receiving and transmitting device. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may communicate electronically via one or more buses (e.g., a bus 945).

[0151] When the device 905 operates as a receiving device (e.g., or a device that both transmits and receives), the communication manager 910 can receive a first sidelink message in a sidelink control channel configured for a first RAT. In some embodiments, the communication manager 910 can determine a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel. The communication manager 910 can then monitor the set of time and frequency resources for a second sidelink message associated with a second RAT that is different from the first RAT.

[0152] When the device 905 operates as a transmitting device (e.g., or a device that both transmits and receives), the communication manager 910 can determine a sidelink control channel configured for a first RAT. Additionally or alternatively, the communication manager 910 can determine a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel. The communication manager 910 can then send a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT.

[0153] I / O controller 915 can manage input and output signals for device 905. I / O controller 915 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 can utilize a computer such as a , or other known operating systems. In other cases, I / O controller 915 may represent a modem, keyboard, mouse, touch screen, or similar device, or may interact with these devices. In some cases, I / O controller 915 may be implemented as part of a processor. In some cases, a user may interact with device 905 via I / O controller 915 or via hardware components controlled by I / O controller 915.

[0154] The transceiver 920 may communicate bidirectionally via one or more antennas, wired links, or wireless links as described herein. For example, the transceiver 920 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 920 may also include a modem for modulating packets and providing modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0155] In some cases, a wireless device may include a single antenna 925. However, in some cases, the device may have more than one antenna 925, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0156] The memory 930 may include random access memory (RAM) and read-only memory (ROM). The memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 930 may contain, 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.

[0157] The processor 940 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) so that the device 905 performs various functions (e.g., functions or tasks that support sidelink communications using sidelink resource pools configured for different RATs).

[0158] The code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 935 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 935 may not be directly executable by the processor 940, but (e.g., when compiled and executed) may cause a computer to perform the functions described herein.

[0159] Fig.10 A flow chart illustrating a method 1000 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is shown. The operations of the method 1000 may be performed by a UE 115, a receiving device, a receiving UE 115, or a component thereof as described herein. For example, the operations of the method 1000 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0160] At 1005, the UE may receive a first sidelink message in a sidelink control channel configured for the first RAT. The operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be performed by the first RAT sidelink component, as described in reference to Figures 6 to 9as described.

[0161] At 1010, the UE may determine a set of time and frequency resources indicated by a first sidelink message received in a sidelink control channel. The operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a sidelink resource determination component, such as reference 1010. Figures 6 to 9 as described.

[0162] At 1015, the UE may monitor for a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. The operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be performed by a second RAT sidelink component, as described with reference to Figures 6 to 9 as described.

[0163] Fig.11 A flow chart illustrating a method 1100 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is shown. The operations of the method 1100 may be performed by a UE 115, a receiving device, a receiving UE 115, or a component thereof as described herein. For example, the operations of the method 1100 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0164] At 1105, the UE may receive a first sidelink message in a sidelink control channel configured for the first RAT. The operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by the first RAT sidelink component, as described in reference to Figures 6 to 9 as described.

[0165] At 1110, the UE may determine a set of time and frequency resources indicated by a first sidelink message received in a sidelink control channel. The operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a sidelink resource determination component, such as reference 1110. Figures 6 to 9 as described.

[0166] At 1115, the UE may monitor the set of time and frequency resources for a second sidelink message associated with a second RAT, the second RAT being different from the first RAT. The operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a second RAT sidelink component, such as with reference to Figures 6 to 9 as described.

[0167] At 1120, the UE may determine that a first SCS associated with the first RAT is different from a second SCS associated with the second RAT, wherein based on the first SCS being different from the second SCS, a plurality of TTIs configured for the second RAT overlap with a single TTI for a sidelink control channel. The operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be performed by an SCS determination component, such as with reference to Figures 6 to 9 as described.

[0168] At 1125, the UE may monitor for a second sidelink message in a first TTI in the plurality of TTIs. The operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by a plurality of TTI sidelink components, such as those described in reference to Figures 6 to 9 as described.

[0169] Fig.12 A flow chart illustrating a method 1200 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is shown. The operations of the method 1200 may be performed by a UE 115, a receiving device, a receiving UE 115, or a component thereof as described herein. For example, the operations of the method 1200 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0170] At 1205, the UE may receive a first sidelink message in a sidelink control channel configured for the first RAT. The operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed by the first RAT sidelink component, as described in reference to Figures 6 to 9 as described.

[0171] At 1210, the UE may determine a set of time and frequency resources indicated by a first sidelink message received in a sidelink control channel. The operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed by a sidelink resource determination component, such as reference 1210. Figures 6 to 9 as described.

[0172] At 1215, the UE may receive, in the sidelink control channel, a field in the first sidelink message indicating a set of time and frequency resources configured for the second RAT. The operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be performed by a sidelink resource indication component, such as reference 1214 to the sidelink control channel. Figures 6 to 9 as described.

[0173] At 1220, the UE may monitor for a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. The operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be performed by a second RAT sidelink component, such as with reference to Figures 6 to 9 as described.

[0174] Fig.13 A flow chart illustrating a method 1300 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is shown. The operations of the method 1300 may be performed by a UE 115, a receiving device, a receiving UE 115, or a component thereof as described herein. For example, the operations of the method 1300 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0175] At 1305, the UE may receive a first sidelink message in a sidelink control channel configured for the first RAT. The operations of 1305 may be performed according to methods described herein. In some examples, aspects of the operations of 1305 may be performed by a first RAT sidelink component, such as with reference to Figures 6 to 9 as described.

[0176] At 1310, the UE may receive a first sidelink message in a sidelink control channel as part of an SPS process. 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 by a sidelink resource indication component, such as reference 1310. Figures 6 to 9 as described.

[0177] At 1315, the UE may determine a set of time and frequency resources indicated by a first sidelink message received in a sidelink control channel. The operations of 1315 may be performed according to methods described herein. In some examples, aspects of the operations of 1315 may be performed by a sidelink resource determination component, such as reference 1314 to determine the time and frequency resources indicated by the first sidelink message received in the sidelink control channel. Figures 6 to 9 as described.

[0178] At 1320, the UE may receive an additional sidelink message indicating a set of time and frequency resources that can be used for a second sidelink message configured for a second RAT. 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 by a sidelink resource indication component, such as reference 1320. Figures 6 to 9 as described.

[0179] At 1325, the UE may monitor the set of time and frequency resources for a second sidelink message associated with a second RAT that is different from the first RAT. The operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed by a second RAT sidelink component, such as with reference to Figures 6 to 9 as described.

[0180] Fig.14 A flow chart illustrating a method 1400 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is shown. The operations of the method 1400 may be performed by a UE 115, a transmitting device, a transmitting UE 115, or a component thereof as described herein. For example, the operations of the method 1400 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0181] At 1405, the UE may determine a sidelink control channel configured for the first RAT. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of operation 1405 may be performed by the first RAT sidelink component, as described in reference to Figures 6 to 9 as described.

[0182] At 1410, the UE may determine a set of time and frequency resources indicated by a first sidelink message in a sidelink control channel. 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 by a sidelink resource determination component, such as reference 1410. Figures 6 to 9 as described.

[0183] At 1415, the UE may send a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. 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 by a second RAT sidelink component, such as with reference to Figures 6 to 9 as described.

[0184] Fig.15 A flow chart illustrating a method 1500 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is shown. The operations of the method 1500 may be performed by a UE 115, a transmitting device, a transmitting UE 115, or a component thereof as described herein. For example, the operations of the method 1500 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0185] At 1505, the UE may determine a sidelink control channel configured for the first RAT. 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 by the first RAT sidelink component, as described in reference to Figures 6 to 9 as described.

[0186] At 1510, the UE may determine a set of time and frequency resources indicated by a first sidelink message in a sidelink control channel. 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 by a sidelink resource determination component, such as reference 1510. Figures 6 to 9 as described.

[0187] At 1515, the UE may send a first sidelink message in a sidelink control channel, the first sidelink message indicating a set of time and frequency resources. The operations of 1515 may be performed according to methods described herein. In some examples, aspects of operation 1515 may be performed by a first RAT sidelink component, such as with reference to Figures 6 to 9 as described.

[0188] At 1520, the UE may send a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. 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 by a second RAT sidelink component, such as with reference to Figures 6 to 9 as described.

[0189] Fig.16 A flow chart illustrating a method 1600 for supporting sidelink communications using sidelink resource pools configured for different RATs in accordance with aspects of the present disclosure is shown. The operations of the method 1600 may be performed by a UE 115, a transmitting device, a transmitting UE 115, or a component thereof as described herein. For example, the operations of the method 1600 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0190] At 1605, the UE may receive a first sidelink message in a sidelink control channel. 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 by a first RAT sidelink component, such as with reference to Figures 6 to 9 as described.

[0191] At 1610, the UE may determine a sidelink control channel configured for the first RAT. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by the first RAT sidelink component, as described in reference to Figures 6 to 9 as described.

[0192] At 1615, the UE may determine a set of time and frequency resources indicated by the first sidelink message in the sidelink control channel. 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 by a sidelink resource determination component, such as reference 1614. Figures 6 to 9 as described.

[0193] At 1620, the UE may send a second sidelink message associated with a second RAT on the set of time and frequency resources, the second RAT being different from the first RAT. The operations of 1620 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1620 may be performed by a second RAT sidelink component, such as described in reference to Figures 6 to 9 as described.

[0194] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0195] The following provides an overview of various aspects of the present disclosure:

[0196] Aspect 1: A method for wireless communication at a receiving device, comprising: receiving a first sidelink message in a sidelink control channel configured for a first radio access technology; determining a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel; and monitoring a second sidelink message associated with a second radio access technology on the set of time and frequency resources, the second radio access technology being different from the first radio access technology.

[0197] Aspect 2: The method of Aspect 1 also includes: determining that a first subcarrier spacing associated with the first radio access technology is different from a second subcarrier spacing associated with the second radio access technology, wherein at least partially based on the first subcarrier spacing being different from the second subcarrier spacing, multiple transmission time intervals configured for the second radio access technology overlap with a single transmission time interval used for the sidelink control channel.

[0198] Aspect 3: The method of Aspect 2, wherein monitoring the second sidelink message comprises: monitoring the second sidelink message in a first transmission time interval among the plurality of transmission time intervals.

[0199] Aspect 4: The method of Aspect 3 further includes: monitoring the retransmission of the second sidelink message in one or more remaining transmission time intervals of the multiple transmission time intervals after the first transmission time interval.

[0200] Aspect 5: The method of any one of Aspects 3 to 4, wherein one or more transmission time intervals of the plurality of transmission time intervals after the first transmission time interval can be used by an additional device operating in the second radio access technology.

[0201] Aspect 6: The method of any one of Aspects 2 to 5, further comprising: determining that the second sidelink message includes a transmission block spanning two or more transmission time intervals among the multiple transmission time intervals; and monitoring the transmission block in each transmission time interval of the two or more transmission time intervals.

[0202] Aspect 7: The method of any one of Aspects 2 to 6, further comprising: determining that the second sidelink message is sent in two or more transmission time intervals among the multiple transmission time intervals; and monitoring the second sidelink message in each transmission time interval among the two or more transmission time intervals, wherein the receiving device combines each received instance of the sidelink message from the two or more transmission time intervals.

[0203] Aspect 8: The method of Aspect 7, wherein the second sidelink message is sent in the two or more transmission time intervals based at least in part on a redundancy version cycle configuration.

[0204] Aspect 9: The method of any one of Aspects 1 to 8, further comprising: receiving the first sidelink message and the second sidelink message in the sidelink control channel from the same transmitting device.

[0205] Aspect 10: The method of any one of Aspects 1 to 9 further includes: receiving the first sidelink message in the sidelink control channel from the first transmitting device; and receiving the second sidelink message from the second transmitting device.

[0206] Aspect 11: The method of any one of Aspects 1 to 10, wherein receiving the first sidelink message in the sidelink control channel comprises: receiving in the sidelink control channel a field in the first sidelink message indicating the set of time and frequency resources configured for the second radio access technology.

[0207] Aspect 12: A method according to any one of Aspects 1 to 11, wherein receiving the first sidelink message in the sidelink control channel comprises: receiving the first sidelink message in the sidelink control channel as part of a semi-persistent scheduling process; and receiving an additional sidelink message indicating the set of time and frequency resources that can be used for the second sidelink message configured for the second radio access technology.

[0208] Aspect 13: The method of any one of Aspects 1 to 12, wherein the set of time and frequency resources comprises time and frequency resources for a sidelink feedback channel associated with the second radio access technology.

[0209] Aspect 14: The method of any one of Aspects 1 to 13, wherein the first radio access technology comprises Long Term Evolution, and the second radio access technology comprises New Radio.

[0210] Aspect 15: A method for wireless communication at a transmitting device, comprising: determining a sidelink control channel configured for a first radio access technology; determining a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel; and sending a second sidelink message associated with a second radio access technology on the set of time and frequency resources, the second radio access technology being different from the first radio access technology.

[0211] Aspect 16: The method of Aspect 15 also includes: determining that a first subcarrier spacing associated with the first radio access technology is different from a second subcarrier spacing associated with the second radio access technology, wherein at least in part based on the first subcarrier spacing being different from the second subcarrier spacing, multiple transmission time intervals associated with the second radio access technology overlap with a single transmission time interval for the sidelink control channel.

[0212] Aspect 17: The method of Aspect 16, wherein sending the second sidelink message comprises: sending the second sidelink message in a first transmission time interval among the multiple transmission time intervals.

[0213] Aspect 18: The method of Aspect 17 further includes: sending a retransmission of the second sidelink message in one or more remaining transmission time intervals of the multiple transmission time intervals after the first transmission time interval.

[0214] Aspect 19: The method of any one of Aspects 17 to 18, wherein one or more transmission time intervals of the plurality of transmission time intervals following the first transmission time interval can be used by an additional device operating in the second radio access technology.

[0215] Aspect 20: The method of any one of Aspects 16 to 19 further includes: determining that the second sidelink message includes a transmission block spanning two or more transmission time intervals among the multiple transmission time intervals; and sending the transmission block in each transmission time interval of the two or more transmission time intervals.

[0216] Aspect 21: The method of any one of Aspects 16 to 20, further comprising: sending the second sidelink message in two or more transmission time intervals among the multiple transmission time intervals.

[0217] Aspect 22: The method of any one of Aspects 15 to 21, further comprising: sending the first sidelink message in the sidelink control channel, the first sidelink message indicating the time and frequency resource set.

[0218] Aspect 23: The method of Aspect 22, wherein sending the first sidelink message in the sidelink control channel comprises: sending a field in the first sidelink message in the sidelink control channel indicating the set of time and frequency resources configured for the second radio access technology.

[0219] Aspect 24: A method according to any one of Aspects 22 to 23, wherein sending the first sidelink message in the sidelink control channel comprises: sending the first sidelink message in the sidelink control channel as part of a semi-persistent scheduling process; and sending an additional sidelink message indicating the set of time and frequency resources that can be used for the sidelink message configured for the second radio access technology.

[0220] Aspect 25: The method of any one of Aspects 15 to 24, further comprising: receiving the first sidelink message on the sidelink control channel.

[0221] Aspect 26: The method of any one of Aspects 15 to 25, wherein the set of time and frequency resources comprises time and frequency resources for a sidelink feedback channel associated with the second radio access technology.

[0222] Aspect 27: The method of any one of Aspects 15 to 26, wherein the first radio access technology comprises Long Term Evolution, and the second radio access technology comprises New Radio.

[0223] Aspect 28: An apparatus for performing wireless communications at a receiving device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of Aspects 1 to 14.

[0224] Aspect 29: An apparatus for wireless communication at a receiving device, comprising at least one component for performing the method of any one of aspects 1 to 14.

[0225] Aspect 30: A non-transitory computer-readable medium storing code for wireless communication at a receiving device, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 14.

[0226] Aspect 31: An apparatus for performing wireless communications at a transmitting device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform any one of the methods of Aspects 15 to 27.

[0227] Aspect 32: An apparatus for wireless communication at a transmitting device, comprising at least one component for performing the method of any one of Aspects 15 to 27.

[0228] Aspect 33: A non-transitory computer-readable medium storing a code for wireless communication at a transmitting device, the code comprising instructions executable by a processor to perform the method of any one of aspects 15 to 27.

[0229] Although aspects of LTE, LTE-A, LTE-APro, or NR systems may be described for purposes of example, and LTE, LTE-A, LTE-APro, or NR terminology may be used in many descriptions, the techniques described herein may be applicable beyond LTE, LTE-A, LTE-APro, or NR networks. For example, the techniques described may be applicable 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.

[0230] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0231] The various illustrative blocks and components described in connection 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. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0232] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on a computer-readable medium or transmitted on a computer-readable medium as one or more instructions or codes on a computer-readable medium. Other examples and specific embodiments are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these. The features that implement the functions can also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0233] Computer readable medium includes two kinds of non-temporary computer storage medium and communication medium, and communication medium includes any medium that is convenient to transfer computer program from one place to another place.Non-temporary storage medium can be any available medium that can be accessed by general or special computer.As an example and not limitation, non-temporary computer readable medium may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other compact disc storage, disk storage or other magnetic storage device, or can be used to carry or store required program code device in the form of instruction or data structure and can be accessed by general or special computer or general or special processor Any other non-temporary medium.Any connection is also properly referred to as computer readable medium.For example, if software is sent from website, server or other remote source using coaxial cable, optical cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, etc., then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave, etc. are all included in the definition of computer readable medium. Disk and disc as used herein include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disks usually reproduce data magnetically, while discs reproduce data optically via lasers. Combinations of the above items are also included within the scope of computer-readable media.

[0234] As used herein (including in the claims), "or" as used in a list of items (e.g., a list of items ending 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of this 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."

[0235] In the 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 the similar components. If only the first reference number is used in the specification, the description applies to any of the similar components having the same first reference number, regardless of the second or other subsequent reference numbers.

[0236] The description set forth herein in conjunction with the accompanying drawings describes example configurations and does not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." The specific implementation includes specific details for the purpose of providing an understanding of the described technology. However, these technologies may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0237] The description herein is provided to enable persons skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be in the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a receiving device, comprising: receiving a first sidelink message in a sidelink control channel configured for a first radio access technology; determining a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel, the set of time and frequency resources being configured for the first radio access technology; as well as The set of time and frequency resources configured for use with the first radio access technology is monitored for a second sidelink message associated with a second radio access technology different from the first radio access technology.

2. The method according to claim 1, further comprising: Determining that a first subcarrier spacing associated with the first radio access technology is different from a second subcarrier spacing associated with the second radio access technology, wherein based at least in part on the first subcarrier spacing being different from the second subcarrier spacing, multiple transmission time intervals configured for the second radio access technology overlap with a single transmission time interval for the sidelink control channel.

3. The method of claim 2, wherein monitoring the second sidelink message comprises: The second sidelink message is monitored in a first transmission time interval of the plurality of transmission time intervals.

4. The method according to claim 3, further comprising: The retransmission of the second sidelink message is monitored in one or more remaining transmission time intervals of the plurality of transmission time intervals after the first transmission time interval.

5. The method of claim 3, wherein one or more transmission time intervals of the plurality of transmission time intervals following the first transmission time interval can be used by an additional device operating in the second radio access technology.

6. The method according to claim 2, further comprising: determining that the second sidelink message includes a transmission block spanning two or more transmission time intervals of the plurality of transmission time intervals; as well as The transport block is monitored in each of the two or more transmission time intervals.

7. The method according to claim 2, further comprising: determining that the second sidelink message is sent in two or more transmission time intervals of the plurality of transmission time intervals; as well as The second sidelink message is monitored in each of the two or more transmission time intervals, wherein the receiving device combines each received instance of the sidelink message from the two or more transmission time intervals.

8. The method of claim 7, wherein the second sidelink message is sent in the two or more transmission time intervals based at least in part on a redundancy version cycle configuration.

9. The method according to claim 1, further comprising: The first sidelink message and the second sidelink message are received in the sidelink control channel from the same transmitting device.

10. The method according to claim 1, further comprising: receiving, from a first transmitting device, said first sidelink message in said sidelink control channel; as well as The second sidelink message is received from a second transmitting device.

11. The method of claim 1 , wherein receiving the first sidelink message in the sidelink control channel comprises: A field in the first sidelink message indicating the set of time and frequency resources to be configured for the second radio access technology is received in the sidelink control channel.

12. The method of claim 1 , wherein receiving the first sidelink message in the sidelink control channel comprises: receiving the first sidelink message in the sidelink control channel as part of a semi-persistent scheduling procedure; as well as An additional sidelink message is received indicating the set of time and frequency resources usable for the second sidelink message configured for the second radio access technology.

13. The method of claim 1, wherein the set of time and frequency resources comprises time and frequency resources for a sidelink feedback channel associated with the second radio access technology.

14. The method of claim 1, wherein the first radio access technology comprises Long Term Evolution and the second radio access technology comprises New Radio.

15. A method for wireless communication at a transmitting device, comprising: determining a sidelink control channel configured for the first radio access technology; determining a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel, the set of time and frequency resources being configured for use with the first radio access technology; as well as A second sidelink message associated with a second radio access technology different from the first radio access technology is sent on the set of time and frequency resources configured for use with the first radio access technology.

16. The method according to claim 15, further comprising: Determine that a first subcarrier spacing associated with the first radio access technology is different from a second subcarrier spacing associated with the second radio access technology, wherein based at least in part on the first subcarrier spacing being different from the second subcarrier spacing, multiple transmission time intervals associated with the second radio access technology overlap with a single transmission time interval for the sidelink control channel.

17. The method of claim 16, wherein sending the second sidelink message comprises: The second sidelink message is sent in a first transmission time interval of the plurality of transmission time intervals.

18. The method according to claim 17, further comprising: A retransmission of the second sidelink message is sent in one or more remaining transmission time intervals of the plurality of transmission time intervals after the first transmission time interval.

19. The method of claim 17, wherein one or more transmission time intervals of the plurality of transmission time intervals following the first transmission time interval can be used by an additional device operating in the second radio access technology.

20. The method of claim 16, further comprising: determining that the second sidelink message includes a transmission block spanning two or more transmission time intervals of the plurality of transmission time intervals; as well as The transport block is monitored in each of the two or more transmission time intervals.

21. The method of claim 16, further comprising: The second sidelink message is sent in two or more transmission time intervals of the plurality of transmission time intervals.

22. The method of claim 15, further comprising: The first sidelink message is sent in the sidelink control channel, the first sidelink message indicating the set of time and frequency resources.

23. The method of claim 22, wherein sending the first sidelink message in the sidelink control channel comprises: A field in the first sidelink message indicating the set of time and frequency resources to be configured for the second radio access technology is sent in the sidelink control channel.

24. The method of claim 22, wherein sending the first sidelink message in the sidelink control channel comprises: sending the first sidelink message in the sidelink control channel as part of a semi-persistent scheduling procedure; as well as An additional sidelink message is sent indicating the set of time and frequency resources usable for the sidelink message configured for the second radio access technology.

25. The method of claim 15, further comprising: The first sidelink message is received on the sidelink control channel.

26. The method of claim 15, wherein the set of time and frequency resources comprises time and frequency resources for a sidelink feedback channel associated with the second radio access technology.

27. The method of claim 15, wherein the first radio access technology comprises Long Term Evolution and the second radio access technology comprises New Radio.

28. An apparatus for wireless communication at a receiving device, comprising: Memory; as well as one or more processors coupled to the memory, wherein the one or more processors are configured to cause the apparatus to: receiving a first sidelink message in a sidelink control channel configured for a first radio access technology; determining a set of time and frequency resources indicated by the first sidelink message received in the sidelink control channel, the set of time and frequency resources being configured for use with the first radio access technology; as well as The set of time and frequency resources configured for use with the first radio access technology is monitored for a second sidelink message associated with a second radio access technology different from the first radio access technology.

29. The device according to claim 28, wherein The one or more processors are further configured to cause the apparatus to: Determining that a first subcarrier spacing associated with the first radio access technology is different from a second subcarrier spacing associated with the second radio access technology, wherein based at least in part on the first subcarrier spacing being different from the second subcarrier spacing, multiple transmission time intervals configured for the second radio access technology overlap with a single transmission time interval for the sidelink control channel.

30. The device according to claim 29, wherein: The one or more processors are configured to cause the apparatus to perform the following to monitor the second sidelink message: The second sidelink message is monitored in a first transmission time interval of the plurality of transmission time intervals.

31. The apparatus of claim 30, wherein the one or more processors are further configured to cause the apparatus to: The retransmission of the second sidelink message is monitored in one or more remaining transmission time intervals of the plurality of transmission time intervals after the first transmission time interval.

32. The apparatus of claim 30, wherein one or more transmission time intervals of the plurality of transmission time intervals following the first transmission time interval can be used by an additional device operating in the second radio access technology.

33. The apparatus of claim 29, wherein the one or more processors are further configured to cause the apparatus to: determining that the second sidelink message includes a transmission block spanning two or more transmission time intervals of the plurality of transmission time intervals; and The transport block is monitored in each of the two or more transmission time intervals.

34. The apparatus of claim 29, wherein the one or more processors are further configured to cause the apparatus to: determining that the second sidelink message is sent in two or more transmission time intervals of the plurality of transmission time intervals; and The second sidelink message is monitored in each of the two or more transmission time intervals, wherein the receiving device combines each received instance of the sidelink message from the two or more transmission time intervals.

35. The apparatus of claim 34, wherein the second sidelink message is sent in the two or more transmission time intervals based at least in part on a redundancy version cycle configuration.

36. The apparatus of claim 28, wherein the one or more processors are further configured to cause the apparatus to: The first sidelink message and the second sidelink message are received in the sidelink control channel from the same transmitting device.

37. The apparatus of claim 28, wherein the one or more processors are further configured to cause the apparatus to: receiving, from a first transmitting device, said first sidelink message in said sidelink control channel; and The second sidelink message is received from a second transmitting device.

38. The apparatus of claim 28, wherein the one or more processors are configured to cause the apparatus to perform the following to receive the first sidelink message in the sidelink control channel: A field in the first sidelink message indicating the set of time and frequency resources to be configured for the second radio access technology is received in the sidelink control channel.

39. The apparatus of claim 28, wherein the one or more processors are configured to cause the apparatus to perform the following to receive the first sidelink message in the sidelink control channel: receiving the first sidelink message in the sidelink control channel as part of a semi-persistent scheduling procedure; and An additional sidelink message is received indicating the set of time and frequency resources usable for the second sidelink message configured for the second radio access technology.

40. The apparatus of claim 28, wherein the set of time and frequency resources comprises time and frequency resources for a sidelink feedback channel associated with the second radio access technology.

41. The apparatus of claim 28, wherein the first radio access technology comprises Long Term Evolution and the second radio access technology comprises New Radio.

42. An apparatus for wireless communication at a transmitting device, comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors being configured to cause the apparatus to: determining a sidelink control channel configured for the first radio access technology; determining a set of time and frequency resources indicated by a first sidelink message in the sidelink control channel, the set of time and frequency resources being configured for the first radio access technology; as well as A second sidelink message associated with a second radio access technology different from the first radio access technology is sent on the set of time and frequency resources configured for the first radio access technology.

43. The apparatus of claim 42, wherein the one or more processors are further configured to cause the apparatus to: Determine that a first subcarrier spacing associated with the first radio access technology is different from a second subcarrier spacing associated with the second radio access technology, wherein based at least in part on the first subcarrier spacing being different from the second subcarrier spacing, multiple transmission time intervals associated with the second radio access technology overlap with a single transmission time interval for the sidelink control channel.

44. The device according to claim 43, wherein The one or more processors are configured to cause the apparatus to perform the following to send the second sidelink message: The second sidelink message is sent in a first transmission time interval of the plurality of transmission time intervals.

45. The apparatus of claim 44, wherein the one or more processors are further configured to cause the apparatus to: A retransmission of the second sidelink message is sent in one or more remaining transmission time intervals of the plurality of transmission time intervals after the first transmission time interval.

46. ​​The apparatus of claim 44, wherein one or more transmission time intervals of the plurality of transmission time intervals following the first transmission time interval can be used by an additional device operating in the second radio access technology.

47. The apparatus of claim 43, wherein the one or more processors are further configured to cause the apparatus to: determining that the second sidelink message includes a transmission block spanning two or more transmission time intervals of the plurality of transmission time intervals; and The transport block is monitored in each of the two or more transmission time intervals.

48. The apparatus of claim 43, wherein the one or more processors are further configured to cause the apparatus to: The second sidelink message is sent in two or more transmission time intervals of the plurality of transmission time intervals.

49. The apparatus of claim 42, wherein the one or more processors are further configured to cause the apparatus to: The first sidelink message is sent in the sidelink control channel, the first sidelink message indicating the set of time and frequency resources.

50. The apparatus of claim 49, wherein: The one or more processors are configured to cause the apparatus to perform the following to send the first sidelink message in the sidelink control channel: A field in the first sidelink message indicating the set of time and frequency resources to be configured for the second radio access technology is sent in the sidelink control channel.

51. The apparatus of claim 49, wherein: The one or more processors are configured to cause the apparatus to perform the following to send the first sidelink message in the sidelink control channel: sending the first sidelink message in the sidelink control channel as part of a semi-persistent scheduling procedure; and An additional sidelink message is sent indicating the set of time and frequency resources usable for the sidelink message configured for the second radio access technology.

52. The apparatus of claim 42, wherein the one or more processors are further configured to cause the apparatus to: The first sidelink message is received on the sidelink control channel.

53. The apparatus of claim 42, wherein the set of time and frequency resources comprises time and frequency resources for a sidelink feedback channel associated with the second radio access technology.

54. The apparatus of claim 42, wherein the first radio access technology comprises Long Term Evolution and the second radio access technology comprises New Radio.

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