The resource pattern determination for d2r transmission
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-08-13
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Figure CN2025075882_13082026_PF_FP_ABST
Abstract
Description
THE RESOURCE PATTERN DETERMINATION FOR D2R TRANSMISSIONFIELD OF TECHNOLOGY
[0001] The present disclosure relates to wireless communication, including resource pattern determination for device-to-reader transmissions.BACKGROUND
[0002] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .SUMMARY
[0003] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.
[0004] A method for wireless communication by a wireless device is described. The method may include transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device, receiving, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message, and transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0005] A wireless device for wireless communication is described. The wireless device may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the wireless device to transmit, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device, receive, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message, and transmit, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0006] Another wireless device for wireless communication is described. The wireless device may include means for transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device, means for receiving, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message, and means for transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0007] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by one or more processors to transmit, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device, receive, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message, and transmit, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0008] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each include a single index and a value of the single index points a respective pair of a time resource and a frequency resource from among a sequence of candidate resource pairs across a time domain and a frequency domain, each resource pair of the sequence of candidate resource pairs associated with a respective value of the single index.
[0009] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each include a first index that points to a respective frequency resource from among a sequence of candidate frequency resources each associated with a respective value of the first index and a second index that points to a respective time resource from among a sequence of candidate time resources each associated with a respective value of the second index.
[0010] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, transmitting the second message may include operations, features, means, or instructions for transmitting the second message according to the second time and frequency resource allocation pattern and according to a first chip rate, where the second time and frequency resource allocation pattern may be the same as the first time and frequency resource allocation pattern associated with the first message and the first chip rate may be also used for transmitting the first message based on a common resource and chip rate configuration for transmissions by the wireless device.
[0011] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, transmitting the second message may include operations, features, means, or instructions for transmitting the second message according to the second time and frequency resource allocation pattern and according to a second chip rate, where the second time and frequency resource allocation pattern may be different from the first time and frequency resource allocation pattern associated with the first message and the second chip rate may be different from a first chip rate used for transmitting the first message in accordance with the second message including a second message type that may be different from a first message type of the first message.
[0012] Some examples of the method, wireless devices, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting the first time and frequency resource allocation pattern from a set of multiple candidate time and frequency resource allocation patterns supported by the wireless device in accordance with at least a random selection, or in accordance with one or more selection parameters, or a combination thereof, where the one or more selection parameters include at least a device type associated with the wireless device, or a clock reliability associated with the wireless device, or a received signal power of one or more previously received messages, or a combination thereof, and where transmitting the first message in accordance with the first time and frequency resource allocation pattern may be based on the selecting.
[0013] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, receiving the second message may include operations, features, means, or instructions for receiving, via the second message, an indication of the at least one second index associated with the second time and frequency resource allocation pattern, where transmitting the third message may be in accordance with the indication.
[0014] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, receiving the second message may include operations, features, means, or instructions for receiving, via the second message, a set of multiple device identifiers (IDs) associated with a set of multiple wireless devices, where an order of the set of multiple device IDs in the second message maps to an order of a set of multiple candidate time and frequency resources, and where transmitting the third message according to the at least one second index may be based on a position of a device ID of the wireless device in the order of the set of multiple device IDs being mapped to the at least one second index in accordance with the second time and frequency resource allocation pattern.
[0015] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, receiving the second message may include operations, features, means, or instructions for receiving, via the second message, IDs of one or more wireless devices associated with the one or more packets, of the set of multiple packets, that failed to be decoded and a bitmap including a set of multiple bits each associated with a respective time and frequency resource for a first message of a set of multiple multiplexed first messages including the set of multiple packets, where a first bit value of a bit in the bitmap indicates a respective message associated with the bit was successfully decoded and a second bit value different from the first bit value indicates the respective message was unsuccessfully decoded.
[0016] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, receiving the second message may include operations, features, means, or instructions for receiving, via the second message, a set of multiple device IDs in an order that maps to the set of multiple packets, where one or more device IDs of the set of multiple device IDs include a default ID value that indicates a respective packet was successfully decoded, and where remaining device IDs of the set of multiple device IDs include IDs of one or more wireless devices associated with the one or more packets that were not successfully decoded.
[0017] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, receiving the second message may include operations, features, means, or instructions for receiving, via the second message, one or more device IDs of one or more wireless devices associated with the one or more packets that were not successfully decoded and a respective index to a respective time and frequency resource associated with each of the one or more packets that were not successfully decoded.
[0018] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, receiving the second message may include operations, features, means, or instructions for receiving, via the second message, one or more device IDs of one or more wireless devices associated with the one or more packets that failed to be decoded, one or more indexes to one or more time and frequency resources via which the one or more packets were transmitted, and an indication of the at least one second index to the second frequency resource and the second time resource for transmission of the second message and one or more other second messages that include retransmissions of the one or more packets.
[0019] In some examples of the method, wireless devices, and non-transitory computer-readable medium described herein, the first wireless device includes at least one of an energy harvesting (EH) -capable device, or an ambient internet-of-things (A-IoT) device, or both.
[0020] Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG. 1 shows an example of a wireless communications system that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.
[0022] FIG. 2 shows an example of a wireless communications system that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.
[0023] FIGs. 3A and 3B show examples of resource allocation patterns that support resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.
[0024] FIGs. 4A through 4C show examples of multi-device indicators that support resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.
[0025] FIG. 5 shows an example of a process flow that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.
[0026] FIGs. 6 and 7 show block diagrams of devices that support resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.
[0027] FIG. 8 shows a block diagram of a communications manager that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.
[0028] FIG. 9 shows a diagram of a system including a device that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.
[0029] FIGs. 10 through 12 show flowcharts illustrating methods that support resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure.DETAILED DESCRIPTION
[0030] Some wireless communications system may include a reader (e.g., a network entity, a complex user equipment (UE) ) and one or more tags (e.g., low-capability UEs, energy harvesting (EH) -capable devices, ambient Internet of Things (A-IoT) devices, or the like) . In some examples, communication from the one or more tags to the reader may support frequency domain multiplexing (FDM) and, as such, the one or more tags may transmit signaling to the reader using different frequency resources within a same time domain resource or within different time domain resources. In some cases, the reader may communicate resource allocation information indicating time and frequency resources for subsequent transmissions by one or more tags. However, communications from the reader to the one or more tags may not support FDM. As such, the signaling transmitted by the reader to multiple tags may be sent via separate packets over multiple different time domain resources, which may increase latency. Additionally, or alternatively, the signaling transmitted by the reader to multiple tags may be sent via a single message including feedback and resource allocation information for multiple messages from multiple tags, which may be associated with relatively high overhead and processing. That is, a feedback message including feedback for multiple tags may be relatively large in size and may not be decodable by the one or more tags, which may have relatively lower processing capabilities.
[0031] The techniques, methods, and devices described herein may enable the reader to indicate time and frequency resources for one or more tag devices to use for one or more subsequent transmissions while reducing overhead and complexity. For example, the device-to-reader (D2R) transmission may be conveyed via a time and frequency resource of a candidate set of resources multiplexed in time and frequency. According to a first time and frequency resource allocation pattern described herein, the candidate set of resources may each be mapped using a single index (e.g., each value of the index may point to one resource) . According to a second time and frequency resource allocation pattern described herein, the candidate set of resources may be mapped using a first index in the time domain and a second index in the frequency domain (e.g., each resource may be pointed to by a respective pair of values of the first index and the second index) . The described resource allocation patterns may reduce overhead as compared with resource allocations that use multiple bits to point to specific time and frequency allocations of each resource via, for example, separate time domain resource allocation (TDRA) and frequency domain resource allocation (FDRA) fields. The tag device may determine which resource to use for a given transmission based on at least one of a random selection, a selection by the tag according to one or more device parameters, an indication received via a reader-to-device (R2D) message, or a combination thereof.
[0032] To further reduce overhead and processing, the techniques, methods, and devices described herein may enable the reader to indicate, via a feedback message, device identifiers (IDs) for failed D2R messages. That is, instead of including a bit for all of the successful and unsuccessful D2R messages, the reader may explicitly indicate the unsuccessful D2R messages. The reader may additionally, or alternatively, indicate a resource allocation pattern for subsequent transmissions by a tag device based on a target chip rate (e.g., a data speed) of the tag device, which may provide a resource allocation pattern that is appropriate for a respective chip rate of each tag device of the multiple tag devices. For example, the time and frequency resources may each be associated with or otherwise support respective chip rates, and the reader may schedule D2R transmission via the resources according to the chip rates to improve reliability and throughput.
[0033] Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further described in the context of wireless communications systems, resource allocation patterns, multi-device indicators, and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to resource pattern determination for device-to-reader transmissions.
[0034] FIG. 1 shows an example of a wireless communications system 100 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The wireless communications system 100 may include one or more devices, such as one or more network devices (e.g., network entities 105) , one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.
[0035] The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via communication link (s) 125 (e.g., a radio frequency (RF) access link) . For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish the communication link (s) 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs) .
[0036] The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices in the wireless communications system 100 (e.g., other wireless communication devices, including UEs 115 or network entities 105) , as shown in FIG. 1.
[0037] As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein) , a UE 115 (e.g., any UE described herein) , a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.
[0038] In some examples, network entities 105 may communicate with a core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via backhaul communication link (s) 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol) . In some examples, network entities 105 may communicate with one another via backhaul communication link (s) 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via the core network 130) . In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol) , or any combination thereof. The backhaul communication link (s) 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) or one or more wireless links (e.g., a radio link, a wireless optical link) , among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.
[0039] One or more of the network entities 105 or network equipment described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology) . In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within one network entity (e.g., a network entity 105 or a single RAN node, such as a base station 140) .
[0040] In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) , which may be configured to utilize a protocol stack that is physically or logically distributed among multiple network entities (e.g., network entities 105) , such as an integrated access and backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 105 may include one or more of a central unit (CU) , such as a CU 160, a distributed unit (DU) , such as a DU 165, a radio unit (RU) , such as an RU 170, a RAN Intelligent Controller (RIC) , such as an RIC 175 (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, such as an SMO system 180, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations) . In some examples, one or more of the network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0041] The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, or any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3) , layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaptation protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU 160 (e.g., one or more CUs) may be connected to a DU 165 (e.g., one or more DUs) or an RU 170 (e.g., one or more RUs) , or some combination thereof, and the DUs 165, RUs 170, or both may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or multiple different RUs, such as an RU 170) . In some cases, a functional split between a CU 160 and a DU 165 or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170) . A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to a DU 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u) , and a DU 165 may be connected to an RU 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface) . In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities (e.g., one or more of the network entities 105) that are in communication via such communication links.
[0042] In some wireless communications systems (e.g., the wireless communications system 100) , infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130) . In some cases, in an IAB network, one or more of the network entities 105 (e.g., network entities 105 or IAB node (s) 104) may be partially controlled by each other. The IAB node (s) 104 may be referred to as a donor entity or an IAB donor. A DU 165 or an RU 170 may be partially controlled by a CU 160 associated with a network entity 105 or base station 140 (such as a donor network entity or a donor base station) . The one or more donor entities (e.g., IAB donors) may be in communication with one or more additional devices (e.g., IAB node (s) 104) via supported access and backhaul links (e.g., backhaul communication link (s) 120) . IAB node (s) 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by one or more DUs (e.g., DUs 165) of a coupled IAB donor. An IAB-MT may be equipped with an independent set of antennas for relay of communications with UEs 115 or may share the same antennas (e.g., of an RU 170) of IAB node (s) 104 used for access via the DU 165 of the IAB node (s) 104 (e.g., referred to as virtual IAB-MT (vIAB-MT) ) . In some examples, the IAB node (s) 104 may include one or more DUs (e.g., DUs 165) that support communication links with additional entities (e.g., IAB node (s) 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream) . In such cases, one or more components of the disaggregated RAN architecture (e.g., the IAB node (s) 104 or components of the IAB node (s) 104) may be configured to operate according to the techniques described herein.
[0043] In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support resource pattern determination for device-to-reader transmissions as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., components such as an IAB node, a DU 165, a CU 160, an RU 170, an RIC 175, an SMO system 180) .
[0044] A 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 the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A 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, a 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 communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, vehicles, or meters, among other examples.
[0045] The UEs 115 described herein may be able to communicate with various types of devices, such as UEs 115 that may sometimes operate as relays, as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
[0046] The UEs 115 and the network entities 105 may wirelessly communicate with one another via the communication link (s) 125 (e.g., one or more access links) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined PHY layer structure for supporting the communication link (s) 125. For example, a carrier used for the communication link (s) 125 may include a portion of an RF spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more PHY layer channels for a given RAT (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each PHY layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting, ” “receiving, ” or “communicating, ” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities, such as one or more of the network entities 105) .
[0047] Signal waveforms transmitted via a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity 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) , such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam) , and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.
[0048] The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts=1 / (Δfmax·Nf) seconds, for which Δfmax may represent a supported subcarrier spacing, and Nf may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
[0049] Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems, such as the wireless communications system 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., Nf) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
[0050] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
[0051] Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to UEs 115 (e.g., one or more UEs) or may include UE-specific search space sets for sending control information to a UE 115 (e.g., a specific UE) .
[0052] In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area, such as the coverage area 110. In some examples, coverage areas 110 (e.g., different coverage areas) associated with different technologies may overlap, but the coverage areas 110 (e.g., different coverage areas) may be supported by the same network entity (e.g., a network entity 105) . In some other examples, overlapping coverage areas, such as a coverage area 110, associated with different technologies may be supported by different network entities (e.g., the network entities 105) . The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 support communications for coverage areas 110 (e.g., different coverage areas) using the same or different RATs.
[0053] Some UEs 115, such as MTC or IoT devices, may be relatively low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication) . M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a network entity 105 (e.g., a base station 140) without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that uses the information or presents the information to humans interacting with the application program. Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
[0054] Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception concurrently) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for the UEs 115 may include entering a power saving deep sleep mode when not engaging in active communications, operating using a limited bandwidth (e.g., according to narrowband communications) , or a combination of these techniques. For example, some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.
[0055] The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) . The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.
[0056] In some examples, a UE 115 may be configured to support communicating directly with other UEs (e.g., one or more of the UEs 115) via a device-to-device (D2D) communication link, such as a D2D communication link 135 (e.g., in accordance with a peer-to-peer (P2P) , D2D, or sidelink protocol) . In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170) , which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to one or more of the UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.
[0057] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
[0058] The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than one hundred kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
[0059] The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) RAT, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA) . Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
[0060] A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may 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, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.
[0061] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
[0062] The UEs 115 and the network entities 105 may support retransmissions of data to increase the likelihood that data is received successfully. Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly via a communication link (e.g., the communication link (s) 125, a D2D communication link 135) . HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) . HARQ may improve throughput at the MAC layer in relatively poor radio conditions (e.g., low signal-to-noise conditions) . In some examples, a device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific slot for data received via a previous symbol in the slot. In some other examples, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
[0063] The wireless communication system 100 may include one or more tag wireless device and one or more reader wireless devices. A tag wireless device may represent an example of a low complexity UE 115 or some other device that is a relatively low complexity device associated with relatively low power consumption. For example, a tag wireless device may be an A-IoT device, an energy harvesting-capable device that is capable of harvesting power from signals received over-the-air, or some other type of device. A reader wireless device may communicate with the tag wireless device and may represent an example of a network entity 105, or some other node or type of device. For example, the reader wireless device may represent an example of a network entity 105 that communicates with multiple tag wireless devices, among other examples.
[0064] The reader wireless device may perform a random access procedure such as a random access channel (RACH) procedure to establish communications with one or more tag wireless devices. As part of the random access procedure, an initial paging message (e.g., Msg0, a trigger message, an inventory message) may be sent by the reader wireless device. One or more tag wireless devices may respond with respective messages, which may be referred to as Msg1. The tag wireless devices may multiplex their communications. For example, the communications from the tag wireless devices to the reader wireless device may support FDM. Accordingly, the reader may receive multiple messages multiplexed in frequency within the same time resources. The reader wireless device may transmit a response to each of the one or more messages. The response may be a Msg2 transmission in response to multiple Msg1 transmissions that are initiated by an R2D transmission triggering random access (e.g., the initial paging message may be an R2D message that triggers random access, the tag wireless devices may respond with Msg1 (s) , and the reader wireless device may reply with one or more Msg2 (s) ) .
[0065] The reader wireless device may transmit the responsive message via a physical random access downlink channel (PRDCH) . In some examples, the PRDCH for the Msg2 transmission may correspond to a Msg1 received from one tag wireless device (e.g., one A-IoT Msg1) . In such cases, the starting time for Msg2 monitoring may be separate for each Msg1 resource. That is, the tag wireless device may transmit the Msg1 via a given time and frequency resource, and that time and frequency resource may be mapped to a respective starting time at which the tag wireless device is to start monitoring for a responsive Msg2. The other tag wireless devices may transmit via other time and frequency resources mapped to other starting monitoring times. Additionally, or alternatively, the staring time for Msg2 monitoring may be common for multiple Msg1 resources. In some other cases, the PRDCH for the Msg2 transmission may correspond to multiple Msg1 transmissions received from multiple different tag wireless devices (e.g., multiple A-IoT Msg1 transmissions) . In such cases, the starting time for Msg2 monitoring may be common for the multiple Msg1 resources.
[0066] In some cases, a data transmission failure may occur, and the reader may be unable to properly receive and decode one or more D2R messages (e.g., Msg3 transmissions of the random access procedure) . In some cases (e.g., when the reader may otherwise refrain from performing subsequent R2D data transmissions, or the like) , the reader may send a subsequent R2D instruction to the one or more tag devices based on the D2R data transmission failure. The reader may repeat a R2D instruction (e.g., an upper layer command via a subsequent Msg2) to trigger the tag device to retransmit the same D2R message (e.g., an upper layer response via a retransmission of a subsequent Msg3) . That is, the tag device may follow the received R2D to transmit a subsequent D2R.
[0067] The reader may resend a Msg2 (e.g., A-IoT Msg2) to one or more specific tag devices to indicate (e.g., echo) the random device IDs associated with the improperly decoded D2R messages. The reader may echo the device IDs in case of a reception failure of one or more corresponding D2R data transmissions (e.g., Msg3) after the initial Msg2. The reader may additionally, via the retransmission of the Msg2, indicate resource scheduling information for the corresponding D2R retransmissions, which may trigger the one or more tag devices (e.g., the tag devices with IDs included within the Msg2) to resend the same D2R data transmission (e.g., Msg3) . The reader device may include, within the Msg2, each random ID of the tag devices with a corresponding Msg3 that is not successfully received.
[0068] The techniques, methods, and devices described herein may enable the reader (e.g., a network entity 105, a high complexity UE 115) to indicate time and frequency resources for one or more tag devices (e.g., low complexity UEs 115, tags, A-IoT devices, EH-capable devices) to use for one or more subsequent transmissions while reducing overhead and complexity. For example, the D2R transmission may be conveyed via a time and frequency resource of a candidate set of resources multiplexed in time and frequency. According to a first time and frequency resource allocation pattern described herein with reference to FIG. 3A, the candidate set of resources may each be mapped using a single index (e.g., each value of the index may point to one resource) . According to a second time and frequency resource allocation pattern described herein with reference to FIG. 3B, the candidate set of resources may be mapped using a first index in the time domain and a second index in the frequency domain (e.g., each resource may be pointed to by a respective pair of values of the first index and the second index) . The described patterns may reduce overhead as compared with resource allocations that use multiple bits to point to specific time and frequency allocations of each resource. The tag device may determine which resource to use for a given transmission based on a random selection, a selection by the tag according to one or more device parameters, an indication received via a R2D message, or a combination thereof.
[0069] To further reduce overhead and processing, the described techniques provide for a reader to indicate, via a feedback message, device IDs for failed D2R messages (e.g., instead of including a bit for each of the successful and unsuccessful D2R messages) . The reader may additionally indicate a resource allocation pattern based on a chip rate (e.g., a data speed) of the tag device, which may provide a resource allocation pattern that is appropriate for a respective chip rate of each tag device of the multiple tag devices.
[0070] FIG. 2 shows an example of a wireless communications system 200 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The wireless communications system 200 may implement or be implemented by aspects of the wireless communications system 100. For example, the wireless communications system 200 may include a reader 205 (e.g., a reader device) and one or more tag devices 215 (e.g., tag wireless devices, EH-capable devices, A-IoT devices, or the like) including a tag device 215-a, a tag device 215-b, and a tag device 215-c. The reader 205 may be an example of a network entity 105 (e.g., a network entity, a network node, or a complex UE such as the UEs 115) , and the one or more tag devices 215 may be examples of low-capability UEs such as UEs 115, as described with reference to FIG. 1.
[0071] In some cases, the reader 205 and the one or more tag devices 215 may perform a random access procedure (e.g., to establish a connection, identify the one or more tag devices 215, or initiate wireless communications, among other examples) . The reader 205 may communicate with the tag devices 215-a, 215-b, and 215-c via communication links 210-a, 210-b, and 210-c, respectively. The communication links 210 may be Uu links, uplink and downlink communication links, or some other type of communication link. Communications from the tag devices 215 to the reader 205 (e.g., uplink communications, or D2R link communications) may be referred to as D2R messages 225, in some examples, and may support FDM. For example, the tag devices 215-a, 215-b, and 215-c may multiplex their messages in time and frequency. Each tag device 215 may transmit its respective D2R message 225 via a respective time and frequency resource indicated via a scheduling message, and the scheduled time and frequency resources may be multiplexed in time and / or frequency to support the D2R multiplexing.
[0072] Communications from the reader 205 to the one or more tag devices 215 may not support FDM. That is, the reader 205 may TDM the R2D messages 220 by transmitting the R2D messages 220 in separate time resources, but the reader 205 may not transmit multiple R2D messages 220 within different frequencies and a same time resource. In some examples, the R2D links may support TDM and not FDM due to relatively limited capabilities of the tag devices 215 (e.g., limited filtering capabilities or no filtering capabilities) . As such, when the reader 205 transmits an initial inventory or paging message (e.g., to initiate the random access procedure, or the like) , the reader 205 may trigger the tag devices 215-a, 215-b, and 215-c to perform inventory such that each of the tag devices 215-a, 215-b, and 215-c may respond with a respective D2R message 225 (e.g., Msg1 of the random access procedure) . The reader 205 may detect the multiple D2R messages 225 each including a respective device ID. The reader 205 may either transmit a respective R2D message 220 (e.g., Msg2 of the random access procedure) per each D2R message 225 to indicate the detected ID of the D2R message 225, or the reader 205 may transmit a single R2D message 220 that corresponds to multiple D2R messages 225 received from multiple tag devices 215.
[0073] In some cases, as part of the random access procedure, each of the tag devices 215-a, 215-b, and 215-c may transmit, via the Msg1 D2R message 225, a sixteen-bit random value (e.g., RN16, or an RN16 value) , which may represent the device ID for each of the one or more tag devices 215. Accordingly, the reader 205 may output the responsive Msg2 R2D message 220 including (e.g., echoing) at least one or more values associated with respective Msg1 D2R messages 225 that failed to be received or decoded by the reader 205, the reader 205 may echo each value (e.g., device ID) associated with each of the Msg1 D2R messages 225 that were successfully received and decoded by the reader 205, or both. In some cases, one or more of the tag devices 215 may select and transmit a same value via a same set of resources (e.g., time resources, frequency resources, or both) , or a different set of resources. As such, the reader 205 may be unable to indicate (e.g., distinguish) , to the one or more tag devices 215 via the Msg2 R2D message 220, which respective D2R messages 225 associated with the one or more tag devices 215 of the tag devices 215-a, 215-b, and 215-c were successfully received and decoded by the reader 205 by echoing the corresponding device IDs, and, as such, the one or more tag devices 215 may be unaware of which of the tag devices 215-a, 215-b, and 215-c should retransmit the D2R message 225 (e.g., Msg3) . Additionally, or alternatively, signaling to distinguish between one or more tag devices 215 corresponding to a same value may relatively increase a signaling overhead, a signaling complexity or both.
[0074] Additionally, or alternatively, the reader 205 may output, to the one or more tag devices 215 via the R2D message 220, an indication of a set of resources for a corresponding D2R message 225 (e.g., Msg3) . That is, the reader 205 may indicate a time resource, a frequency resource, or both to each of the tag devices 215-a, 215-b, and 215-c, or the reader 205 may indicate a set of candidate time and frequency resources for the one or more tag devices 215 to utilize for one or more corresponding D2R messages 225.
[0075] The one or more tag devices 215 may be relatively low-complexity devices and may correspondingly have a relatively low capability (e.g., processing capability, among other examples) , relatively low power (e.g., available power) , or the like. As such, the one or more tag devices 215 may be unable to process the signaling (e.g., R2D messages 220) associated with indicating resources for the D2R messages 225 (e.g., Msg3) , the signaling associated with echoing one or more device IDs, or both, based on the low complexity of the one or more tag devices 215. Additionally, or alternatively, communicating the signaling between the reader 205 and the one or more tag devices 215 may relatively increase a power consumption of the one or more tag devices 215. For example, the reader 205 may output a bitmap via the R2D message 220, with each bit of the bitmap indicating a set of resources associated with a respective R2D message 220 (e.g., Msg1) , and the reader 205 may output (e.g., via the R2D message 220) a list of device IDs with acknowledgment (ACK) . Additionally, or alternatively, the reader 205 may output, via the R2D message 220, a list of device IDs and a list of resources (e.g., Msg1 resources) , where each ID is mapped to a respective resource (e.g., a one-to-one mapping to Msg1 resources) . As such, the reader 205 may indicate to the one or more tag devices 215 which set of resources corresponding to successfully received D2R messages 225 are associated with each of the tag devices 215-a, 215-b, and 215-c. However, such techniques may be inefficient and may relatively increase a power consumption of the one or more tag devices 215.
[0076] The techniques, methods, and devices described herein may support reduced payload sizes for the R2D message 220, which may reduce a power consumption of the one or more tag devices 215 as compared with R2D messages 220 that include feedback and resource allocation information for each D2R payload. The reader 205 may indicate, via one or more R2D messages 220, one or more resource allocations for corresponding D2R messages 225 between the one or more tag devices 215 and the reader 205. For example, the reader 205 may indicate the resource allocations by outputting an indication of one or more resource allocation patterns via the R2D messages 220 as described in further detail elsewhere herein, including with reference to FIGs. 3A and 3B, which may support reduced payload sizes. The one or more resource patterns may include a set of time resources, a set of frequency resources, or both, such that each index of the resource patterns indicates a respective resource pair of both time and frequency resources for the D2R messages 225. In some examples, each of the D2R messages 225 may be associated with a respective resource pair, or one or more of the D2R messages 225 may be associated with a same resource pair.
[0077] In some implementations, a chip rate (e.g., data rate) of each of the one or more tag devices 215 may be associated (e.g., linked) with one or more dedicated resources for the D2R message 225 (e.g., to further reduce the payload of ambient-IoT device) . Accordingly, techniques may support scheduling the one or more tag devices 215 with a resource set corresponding to a respective chip rate of each of the one or more tag devices 215, which may improve scheduling efficiency and communication reliability, among other examples. For example, the reader 205 may schedule each of the one or more tag devices 215 (e.g., A-IoT devices) with a resource corresponding to (e.g., appropriate for) a respective chip rate of the one or more tag devices 215 via one or more R2D messages 220. For an illustrative example, a tag device 215 with a higher signal to interference plus noise ratio (SINR) (e.g., compared to one or more different tag devices) may communicate via (e.g., be allocated with) a resource associated with a higher chip rate.
[0078] In some implementations, each one or more tag devices 215 may utilize a respective resource pair included within the one or more resource patterns for one or more respective first D2R messages 225. For example, each of the tag devices 215-a, 215-b, and 215-c may select a resource for a D2R message 225-a, a D2R message 225-b, and a D2R message 225-c, respectively. In some examples, such as for Msg1 transmissions (e.g., if a previous R2D message 220 does not include a resource allocation) , each of the one or more tag devices 215 may randomly select a resource for transmission of a respective D2R message 225. Additionally, or alternatively, the one or more tag devices 215 may select at least a time resource, a frequency resource, or both based on one or more parameters of each of the one or more tag devices 215 such as a device type, a clock reliability, a received power of one or more received R2D messages 220, or any combination thereof. For an illustrative example, the tag device 215-a may be a first device type (e.g., associated with a respective capability, for an example) and may select a first resource based on the first device type, and the tag device tag device 215-b may select a second resource based on the tag device 215-b corresponding to a second device type different from the tag device 215-a. Each of the tag devices 215-a, 215-b, and 215-c may output the respective first D2R messages 225 (e.g., Msg1 transmissions) according to the selected resources, which may be multiplexed in time and frequency.
[0079] In some implementations, the reader 205 may receive each of the D2R message 225-a, the D2R message 225-b, the D2R message 225-c, or any combination thereof according to the respective selected resources. The reader 205 may output one or more R2D messages 220 based on receiving the one or more D2R messages 225. In some examples, the reader 205 may output the R2D message 220 to trigger (e.g., schedule) Msg3 transmission (e.g., R2D command scheduled D2R transmission) . That is, the reader 205 may output the R2D message 220 to trigger the one or more tag devices 215 to transmit one or more second D2R messages 225 (e.g., Msg3 transmissions) . For example, the reader 205 may output a R2D message 220-a, a R2D message 220-b, and a R2D message 220-c, to each of the tag devices 215-a, 215-b, and 215-c, respectively, such that each of the tag devices 215-a, 215-b, and 215-c may respond with a respective second D2R message 225 (e.g., Msg3 transmission) . Although illustrated as separate R2D messages 220, it is to be understood that the reader 205 may additionally, or alternatively, transmit a single R2D message 220 that requests Msg3 transmissions from each of the tag devices 215-a, 215-b, and 215-c, and includes resource allocations for each of the Msg3 transmissions.
[0080] The one or more tag devices 215 may transmit the respective second D2R messages 225 (e.g., Msg3 transmissions) according to a same resource used for transmission of the first D2R messages 225, or according to a different resource. In some examples, the R2D message 220 may include an indication of a resource for each of the second D2R messages 225 (e.g., based on the first D2R messages 225 and the second D2R messages 225 corresponding to different resources) . In some examples, the reader 205 may explicitly indicate, via the R2D message 220 (e.g., a corresponding R2D scheduling message) , a resource for each of the second D2R messages 225, including a resource for each of a second D2R message 225-a, a second D2R message 225-b, and a second D2R message 225-c (e.g., respective Msg3 transmissions) . In such examples, the reader 205 may indicate, via the R2D message 220 (e.g., scheduling message) a selected resource pattern and an associated resource index for each respective second D2R message 225, as described in further detail elsewhere herein, including with reference to FIGs. 3A and 3B.
[0081] Additionally, or alternatively, the reader 205 may implicitly indicate, via the R2D message 220, a resource for each of the second D2R messages 225. In some examples, the reader 205 may include, within the R2D message 220, a set (e.g., a list) of device IDs (e.g., RN16 values, among other examples) associated with each of the one or more tag devices 215, and the resources for each D2R message 225 may be based on an order of IDs of the one or more tag devices 215 included within the R2D message 220 (e.g., the R2D scheduling message) . That is, in such examples, an ordering (e.g., a ranking, or the like) of the device IDs within the R2D message 220 may correspond (e.g., map) to an ordering of indexes of the associated resource pattern (e.g., as illustrated and described with reference to FIGs. 3A and 3B) , and each one or more tag devices 215 may determine a resource for the respective D2R messages 225 based on the ordering (e.g., mapping) .
[0082] The tag devices 215-a, 215-b, and 215-c may transmit the second D2R message 225-a, the second D2R message 225-b, and the second D2R message 225-c, respectively, according to the respective selected or indicated resources. In some examples, the reader 205 may fail to successfully receive or decode one or more of the second D2R messages 225 (e.g., Msg3 transmissions) . For example, the reader 205 may be unable to successfully decode the second D2R message 225-a from the tag device 215-a. Accordingly, the reader 205 may output an additional R2D message 220 indicating (e.g., scheduling, or requesting) a retransmission of the second D2R message 225-a according to one or more techniques further described herein with reference for FIGs. 4A through 4C. In response to the additional R2D message 220, the tag device 215-a may output a D2R message 225-d (e.g., a retransmission of the second D2R message 225-a) , according to a same resource or a different resource of the second D2R message 225-a.
[0083] FIGs. 3A and 3B show examples of resource allocation patterns 300 and 301 that support resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. Aspects of the resource allocation patterns 300 and 301 may implement or be implemented by aspects of wireless communications system 100, the wireless communications system 200, or both. For example, the resource allocation pattern 300 and the resource allocation pattern 301 may be implemented by a reader, which may represent an example of a network entity 105 or a complex UE 115, as described with reference to FIGs. 1 and 2, and a tag device (e.g., EH-capable device, or A-IoT device) , which may represent an example of a low-capability UE 115, as described herein with reference to FIGs. 1 and 2. As described herein, the resource allocation pattern 300 and the resource allocation pattern 301 illustrate example patterns for indicating time and frequency resources for D2R transmissions.
[0084] The reader and the tag device may communicate one or more D2R messages (e.g., Msg1, Msg3, or both) according to one or more resource allocation patterns. In the examples of FIGs. 3A and 3B, each resource pattern for D2R transmissions may include a set of D2R resources 305 (e.g., a sequence of D2R resources 305) , which may include (e.g., within each pattern) time resources, frequency resources, or both. That is, a single resource pattern may include both time domain resources and frequency domain resources, or the single resource pattern may include time domain resources or frequency domain resources, but not both time domain resources and frequency domain resources.
[0085] FIG. 3A illustrates an example of a resource allocation pattern 300. In some implementations, the reader and the tag device may communicate the one or more D2R messages according to a combination pattern 310-a, which may include a sequence (e.g., an ordering, or the like) of D2R resources 305. The combination pattern 310-amay include an indication of the one or more D2R resources 305, which include both a time domain resource allocation (TDRA) and a frequency domain resource allocation (FDRA) . That is, each D2R resource 305 indicates both time and frequency domain resources (e.g., a resource pair) for D2R communications. In such examples, a single index value may indicate the resource pair, and, as such, an R2D message (e.g., a scheduling message) may include an indication of a single resource index 315 for a corresponding D2R message.
[0086] In some implementations, the reader may output a R2D message (e.g., Msg2) including an indication of a resource allocation for a corresponding D2R message (e.g., Msg3) . The reader may include, within the R2D message, an indication of the combination pattern 310-a and the resource index 315. In such examples, each index value of the resource index 315 may indicate a resource pair including both the TDRA and the FDRA. For an illustrative example, the reader may output the R2D message including the indication of the combination pattern 310-a and the resource index 315, and the tag device may randomly select an index value from the resource index 315. The tag device may randomly select a first index value of the resource index 315 (e.g., 1) which may indicate a first D2R resource 305-a (e.g., including the TDRA and the FDRA) , and the tag device may transmit a D2R message (e.g., Msg1) via the first D2R resource 305-a.
[0087] FIG. 3B illustrates an example of a resource allocation pattern 301. In some implementations, the reader and the tag device may communicate the one or more D2R messages according to one or more resource patterns 310-b (e.g., separate patterns) . For example, a first resource pattern 310-b may include time domain resources, and a second resource pattern 310-b may include frequency domain resources (e.g., separate patterns for TDRA and FDRA) . As such, a first resource index may indicate the time resources of the resource pattern 310-b and a second resource index may indicate the frequency resources of the resource pattern 310-b, and the corresponding R2D message (e.g., scheduling message) may include separate (e.g., at least two) resource indexes for the TDRA and the FDRA, respectively.
[0088] In some implementations, the reader may output the R2D message including an indication of the resource pattern 310-b, a time resource index 320, a frequency resource index 325, or any combination thereof. For an illustrative example, the tag device may receive the D2R message including the indication of the resource pattern 310-b, the time resource index 320, and the frequency resource index 325, and the tag device may randomly select a first value of the time resource index 320 (e.g., 1) and a third value of the frequency resource index 325 (e.g., 3) . As such, the first value of the time resource index 320 and the third value of the frequency resource index 325 may indicate (e.g., in combination) a first D2R resource 305-b of the resource pattern 310-b.
[0089] In some implementations, the reader and the tag device may communicate according to a common resource pattern for multiple D2R transmissions, such as for both Msg1 and Msg3. The common resource pattern may represent a candidate set of frequency shifts and quantity of time resources (e.g., a candidate set of resources) for D2R transmissions (i.e., Msg1 transmission, Msg3 transmission / retransmission, R2D command scheduled D2R transmission, or any combination thereof) . Each resource of the candidate set of resources may correspond to a same chip rate, and each D2R message may correspond to a same chip rate. For example, the tag device may transmit Msg1 and Msg3 according to a same chip rate.
[0090] Additionally, or alternatively, the reader and the tag device may communicate according to separate resource patterns for each D2R transmission (e.g., a specified resource pattern for each specified D2R transmission) . Each specified D2R message may represent a different type of D2R transmission. That is, the resource pattern for Msg1 and Msg3 transmissions may be different. For example, a quantity of resources for Msg3 transmission may be less than a quantity of resources for Msg1 transmission (e.g., a quantity of resources of a resource pattern for Msg3 may be relatively lesser than a quantity of resources of a resource pattern for Msg1) .
[0091] In some examples, the reader and the tag device may communicate multiple D2R messages according to different chip rates (e.g., Msg1 and Msg3 may correspond to different chip rates) . For example, the resources (e.g., frequency resources) for Msg1 transmission correspond to a same first chip rate, and each frequency resource for Msg3 transmission / retransmission correspond to a same second chip rate that is different from the first chip rate. In some examples, the chip rate for each frequency resource of a set of Msg3 frequency resources may be fixed (e.g., predefine the chip rate for each frequency resource of Msg3 transmissions) . Additionally, or alternatively, the tag device may transmit a first Msg3 transmission according to a first chip rate and one or more Msg3 retransmissions according to one or more different chip rates. In such examples, the chip rate for the initial transmission and the chip rates for the retransmissions may be fixed. For example, the chip rate for the retransmissions may be based on a quantity of retransmissions (e.g., predefine the chip rate between first transmission and different quantity of retransmissions) .
[0092] In some implementations, the reader may output the R2D message according to a fixed quantity of bits (e.g., to reduce the length variation of R2D message) . That is, the quantity of bits in R2D message for resource pattern indication may be the same, regardless of whether the R2D message schedules a Msg3 transmission or a Msg3 retransmission. Accordingly, the tag device (e.g., A-IoT device) may determine the corresponding resource pattern based on the scheduled D2R message (e.g., Msg3 transmission or Msg3 retransmission) .
[0093] FIGs. 4A through 4C show examples of indication schemes 400, 401, and 402 that support resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. Aspects of the indication scheme 400, the indication scheme 401, and the indication scheme 402 may implement or be implemented by aspects of the wireless communications system 100, the wireless communications system 200, or both. For example, the indication scheme 400, the indication scheme 401, and the indication scheme 402 may be implemented by a reader and one or more tag devices (e.g., EH-capable devices, A-IoT devices, or the like) which may be examples of the network entity 105 or a complex UE such as the UEs 115 and a low-capability UE such as the UEs 115 or the like, respectively, as described herein with reference to FIGs. 1 and 2.
[0094] In some examples, the reader may be unable to successfully receive or decode one or more D2R messages from the one or more tag devices, such as Msg3 transmissions (e.g., initial Msg3 transmissions, or previous Msg3 transmissions) . Accordingly, the reader may output a R2D message (e.g., a Msg2 / R2D command after a first Msg2 / R2D command) to trigger a Msg3 / D2R retransmission. The reader may determine the content of the Msg2 / R2D command based on one or more D2R resources 405 of the previous Msg3 transmissions.
[0095] In some examples, the reader may include feedback requesting Msg3 / D2R retransmission for multiple tag devices within a single R2D message. In such examples, one or more techniques may enable the reader to provide feedback to the multiple tag devices within the single R2D message. For example, the reader may output, via the R2D message, a bitmap, where each bit of the bitmap corresponds to a respective D2R resource associated with the previous Msg3 transmissions. The reader may output a list of one or more device IDs corresponding to each of the multiple tag devices, or a list of one or more device IDs corresponding to successfully received Msg3 transmissions (e.g., ACK) , or both. As such, each of the multiple tag devices may determine if a respective Msg3 transmission associated with the respective tag device was successfully received. However, such techniques may incur a relatively large signaling overhead (e.g., a relatively large payload size of the R2D message) , which may be unable to be processed by the tag devices, or may relatively increase a power consumption of the tag devices.
[0096] The techniques described herein and illustrated by FIGs. 4A through 4C may provide for the reader to relatively reduce the payload size of the R2D message by indicating a reduced quantity of device ID, by indicating feedback for failed D2R messages (e.g., only failed D2R messages, compared to each D2R message or successful D2R messages) , or both. For example, the reader may dynamically determine the content of the R2D message based on resources used for the previous D2R messages (e.g., a Msg1 transmission, or a previous Msg3 transmission) .
[0097] FIG. 4A illustrates an example indication scheme 400, in which the tag device may determine whether a previous D2R transmission associated with the tag device failed to be received by the reader in accordance with a bitmap 410. The bitmap 410 may provide a correlation between one or more device IDs associated with one or more unsuccessfully received D2R transmissions and a respective set of resources associated with the D2R transmissions.
[0098] In some implementations, the reader may output, via the R2D command (e.g., Msg2) , the bitmap 410, where each bit of the bitmap 410 corresponds to a respective D2R resource 405 associated with the previous Msg3 transmissions (e.g., one bit per previous Msg3 resource) , and a device ID list 415 associated with unsuccessful Msg3 reception (e.g., device IDs with negative acknowledgment (NACK) ) . Accordingly, the Msg2 / R2D command may contain the bitmap 410 based on previous Msg3 / D2R resources (e.g., a one-to-one mapping of bits to D2R resources 405) , the echoed IDs (e.g., included within the device ID list 415 and indicated by one or more respective Msg1 transmissions) associated with Msg3 transmissions that the reader failed to receive or a device identifier associated with D2R messages unsuccessfully received, a resource pattern indication associated with a resource allocation pattern for the scheduled Msg3 / D2R transmissions or retransmissions, a resource index for each scheduled Msg3 / D2R transmission or retransmission, or any combination thereof. That is, the reader may include, within the R2D command, the bitmap 410, the device ID list 415 including a list of NACK device IDs (e.g., tag devices associated with unsuccessfully received Msg3 transmission) , the resource pattern 420-a, and the corresponding resource index. The resource pattern and corresponding index may be described in further detail elsewhere herein, including with reference to FIGs. 3A and 3B.
[0099] A mapping between the bitmap 410 and the D2R resources 405 may include a mapping of an increasing order across frequency domain resources within a given time slot (e.g., resource locations 1 through 3 in ascending order) and a mapping of time domain resources in an increasing order (e.g., resource locations 1 through 3 in a first time slot, and resource locations 4 through 6 in a next time slot) with respect to bit positions of the bitmap 410. That is, each bit of the bitmap 410 may correspond to a respective position of a resource pattern 420-a (e.g., resource allocation pattern) associated with the previous Msg3 transmissions. For example, the reader may output, via the R2D command, an indication of the bitmap 410, the device ID list 415, the resource pattern 420-a, and a resource index corresponding to the resource pattern 420-a. The bitmap 410 may include multiple bits, where a first value of a bit (e.g., 1) indicates that a corresponding Msg3 was successfully received, and a second value of the bit (e.g., 0) indicates that the corresponding Msg3 was not successfully received. For an illustrative example, a third bit of a bitmap 410 may be a zero, which may indicate a NACK (e.g., a first NACK) for a corresponding Msg3. In such examples, the third bit of the bitmap 410 may correspond to a respective D2R resource 405-a of the resource pattern 420-a, and the first NACK may correspond to a first device ID of the indicated device ID list 415. As such, a tag device associated with the first device ID may determine that the corresponding Msg3 associated with the tag device was not successfully received. The tag device may correspondingly select a resource pair for Msg3 retransmission according to the indicated resource pattern and / or resource index.
[0100] FIG. 4B illustrates an example indication scheme 401, in which the tag device may determine whether a previous D2R transmission associated with the tag device failed to be received by the reader in accordance with a device ID list 425. The device ID list 425 may provide a correlation between one or more device IDs associated with one or more unsuccessfully received D2R transmissions and a respective set of resources associated with the D2R transmissions.
[0101] In some implementations, the reader may output, via the R2D command, the device ID list 425 including a list of device IDs that are mapped (e.g., one-to-one mapped) to previous Msg3 resources. In some examples, an index value of a device ID within the device ID list 425 may be indicated by a position of previous Msg3 resources (e.g., corresponding to a resource pattern 420-b of one or more previous Msg3 resources) . That is, an index of a Msg3 resource may indicate an index value of a corresponding tag device ID. In such examples, the device ID list 425 may include one or more predefined (e.g., invalid) device IDs, which may indicate that a corresponding Msg3 was successfully received by the reader (e.g., implicitly indicate NACK, or implicitly indicate ACK) . Accordingly, the reader may include, within the R2D command, one or more echoed IDs (e.g., of Msg1) associated with Msg3 transmissions that the reader failed to receive or a device identifier associated with D2R messages unsuccessfully received, one or more invalid IDs associated with devices having corresponding Msg3 or D2R received successfully, a resource pattern indication for scheduled Msg3 / D2R transmission, a resource index for each scheduled Msg3 / D2R transmission as further described herein with reference to FIGs. 2 through 3B, or any combination thereof.
[0102] For an illustrative example, the reader may include, within the R2D command, the resource pattern 420-b, the device ID list 425, a resource pattern for subsequent Msg3 transmissions, and a corresponding resource index. A D2R resource 405-b may be associated with a relative first position within the resource pattern 420-b, which may indicate an index of the device ID list 425 including an invalid ID, and a D2R resource 405-c may be associated with a relative second position different from the first position within the resource pattern 420-b, which may indicate an index of the device ID list 425 including a first device ID (e.g., a valid ID, or ID 1) . As such, the tag may determine, based on the resource pattern 420-b and the D2R resource 405-c, that a corresponding Msg3 associated with the tag device was not properly received by the reader. The tag device may correspondingly select a resource pair for Msg3 retransmission in according to the indicated resource pattern and / or resource index.
[0103] FIG. 4C illustrates an example indication scheme 402, in which the tag device may determine whether a previous D2R transmission associated with the tag device failed to be received by the reader in accordance with a list 430. The list 430 may provide a correlation between one or more device IDs associated with one or more unsuccessfully received D2R transmissions and a respective resource index of a corresponding resource allocation pattern.
[0104] In some implementations, the reader may output, via the R2D command, the list 430 including a list of device IDs associated with improperly received Msg3 / D2R and a corresponding resource index of the previous Msg3 transmission. Accordingly, the reader may include, within the R2D command, one or more echoed IDs (e.g., of Msg1) associated with Msg3 transmissions that the reader failed to receive or a device identifier associated with D2R messages unsuccessfully received, a resource index, one or more resource indexes associated with the one or more echoed IDs (e.g., index of failed Msg3 / D2R transmission / retransmission) , a resource pattern indication for scheduled Msg3 / D2R transmission, and a resource index for each scheduled Msg3 / D2R transmission as further described herein with reference to FIGs. 2 through 3B.
[0105] For an illustrative example, the reader may include, within the R2D command, the resource pattern 420-c, the list 430, a resource pattern for subsequent Msg3 transmissions, and a corresponding resource index. A D2R resource 405-d may be associated with a position (e.g., index) of the resource pattern 420-c, which may indicate a corresponding index of the list 430. The index of the list 430 may include a device ID (e.g., ID 1) associated with a tag device. The tag device may determine, based on the list 430, that a corresponding Msg3 transmission was not successfully received by the reader, and the tag device may determine a D2R Resource Index of ID 1 associated with the ID 1 in the list 430. The tag device may correspondingly select a resource pair for Msg3 retransmission in according to the indicated resource pattern and resource index as further described herein with reference to FIGs. 2 through 3B.
[0106] In some implementations, a resource determination for D2R transmissions may be based on an order of Msg1 IDs (e.g., RN16 values, among other examples) contained in the Msg2 / R2D command as further described herein with reference to FIG. 2, and a chip rate may be linked with the resources for Msg3 transmissions. As such, the reader may schedule the tag devices to perform Msg3 transmission using a resource associated with the chip rate. Accordingly, the reader may correlate, via one or more techniques described herein with reference to FIGs. 4A through 4C, the echoed IDs of Msg1 with the Msg1 resources or previous Msg3 / D2R resources to reduce ambiguity when more than one tag device transmits the same value (e.g., within Msg1) during a random access procedure.
[0107] In some examples, the reader may indicate, via the Msg2 / R2D command, the resource index of Msg1 transmissions or resource indexes of previous Msg3 / D2R transmissions, as well as echoed device IDs of Msg1 where corresponding Msg3 transmissions failed to receive or device identifier where corresponding D2R messages failed to receive. Accordingly, the reader may include, within the Msg2 / R2D command, one or more echoed IDs of Msg1 with corresponding Msg3 transmissions that were not successfully received or device IDs with corresponding D2R messages that transmissions were not successfully received, resource indexes of failed Msg3 / D2R transmissions or retransmissions, a resource pattern indication for scheduled Msg3 / D2R transmission, or any combination thereof.
[0108] FIG. 5 shows an example of a process flow 500 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The process flow 500 may implement or be implemented by aspects of the wireless communications system 100, the wireless communications system 200, the resource allocation pattern 300, the resource allocation pattern 301, the indication scheme 400, the indication scheme 401, the indication scheme 402, or any combination thereof, as described with reference to FIGs. 1–4C. For example, the process flow 500 may include a second wireless device 505 (e.g., a reader device) and a first wireless device 515 (e.g., a tag wireless device, an EH-capable device, an A-IoT device, or the like) , which may be examples of the network entity 105 (e.g., a network entity, a network node, or a complex UE such as the UEs 115) and a low-capability UEs such as the UEs 115 or the like, respectively.
[0109] In the following description of the process flow 500, the operations between the second wireless device 505 and the first wireless device 515 may be performed in different orders or at different times. Some operations may also be left out of the process flow 500, or other operations may be added. Although the second wireless device 505 and the first wireless device 515 are shown performing the operations of the process flow 500, some aspects of some operations may also be performed by one or more other wireless devices.
[0110] At 520, in some examples, the first wireless device 515 (e.g., tag device) may select a first set of resources including time resources, frequency resources, or both for transmission of a first message (e.g., a first message of a random access procedure, such as a Msg1) . The first wireless device 515 may randomly select the first set of resources from a set of candidate resources, including a sequence of D2R resources, as further described herein with reference to FIGs. 3A and 3B. Additionally, or alternatively, the first wireless device 515 may select the first set of resources from the set of candidate resources in accordance with one or more selection parameters (e.g., device parameters) including a device type of the first wireless device 515, a clock reliability of the first wireless device 515, a received signal power associated with one or more R2D messages, or any combination thereof.
[0111] Additionally, or alternatively, the second wireless device 505 may explicitly indicate or implicitly indicate the first set of resources. For example, the second wireless device 505 may indicate the first set of resources (e.g., via a R2D message) based on the first message representing a Msg3 of the random access procedure.
[0112] At 525, the first wireless device 515 may transmit the first message (e.g., a D2R message such as Msg1) according to the resources selected at 520. The first wireless device 515 may transmit, via the first message, at least one packet associated with the first wireless device. For example, the wireless device 515 may output a device ID including a random value. The first wireless device 515 may output the first message in response to receiving an initial message (e.g., a Msg0) from the second wireless device 505, or the like.
[0113] At 530, the second wireless device 505 may obtain one or more other messages (e.g., D2R messages) such as Msg1 transmissions, Msg3 transmissions, or the like, as further described herein with reference to FIG. 2. The other messages may be multiplexed in frequency (e.g., with the first message, with the one or more other messages, or both) , and the second wireless device 505 may obtain the first message and the other messages during a same time resource, during different time resources, or both based on the selection of resources by the first wireless device 515 at 530. That is, the first wireless device 515 may transmit the first message according to the selected first set of resources, and one or more other wireless devices (e.g., tag devices, EH-capable devices, A-IoT devices, or the like) may transmit according to one or more sets of resources that may include the selected first set of resources, or may be different from the selected first set of resources. Each device of the one or more other wireless devices and the wireless device 515 may be associated with different, respective device IDs.
[0114] At 535, the second wireless device 505 may output, to the first wireless device 515, a second message indicating that one or more of the first message and the other messages received at 530 failed to be decoded (e.g., by the second wireless device 505) . The second wireless device 505 may indicate the one or more failed messages according to one or more techniques further described herein with reference to FIGs. 4A through 4C. For example, the second wireless device 505 may indicate, via the second message, one or more device IDs, one or more utilized resources, or both associated with the failed messages, among other examples. In some examples, the first wireless device 515 may select a second set of resources in accordance with one or more techniques described herein with reference to FIGs. 2 through 4C.
[0115] At 540, the first wireless device 515 may transmit a third message in accordance with the selected second set of resources. In some examples, the third message may represent a first transmission of a Msg3 of the random access procedure. In some other examples, the third message may represent a retransmission of a previous Msg3, where transmitting the third message, by the first wireless device 515, may be based on the second wireless device 505 being unable to successfully decode the first message, and on the receiving the second message at 535.
[0116] FIG. 6 shows a block diagram 600 of a device 605 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communications manager 620. The device 605, or one or more components of the device 605 (e.g., the receiver 610, the transmitter 615, the communications manager 620) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the resource pattern determination described herein. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0117] The receiver 610 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to resource pattern determination for device-to-reader transmissions) . Information may be passed on to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.
[0118] The transmitter 615 may provide a means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to resource pattern determination for device-to-reader transmissions) . In some examples, the transmitter 615 may be co-located with a receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.
[0119] The communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be examples of means for performing various aspects of resource pattern determination for device-to-reader transmissions as described herein. For example, the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0120] In some examples, the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a digital signal processor (DSP) , a central processing unit (CPU) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .
[0121] Additionally, or alternatively, the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code) . If implemented in code executed by at least one processor, the functions of the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .
[0122] In some examples, the communications manager 620 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 610, the transmitter 615, or both. For example, the communications manager 620 may receive information from the receiver 610, send information to the transmitter 615, or be integrated in combination with the receiver 610, the transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.
[0123] The communications manager 620 may support wireless communication in accordance with examples as disclosed herein. For example, the communications manager 620 is capable of, configured to, or operable to support a means for transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device. The communications manager 620 is capable of, configured to, or operable to support a means for receiving, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message. The communications manager 620 is capable of, configured to, or operable to support a means for transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0124] By including or configuring the communications manager 620 in accordance with examples as described herein, the device 605 (e.g., at least one processor controlling or otherwise coupled with the receiver 610, the transmitter 615, the communications manager 620, or a combination thereof) may support techniques for reduced processing, reduced power consumption, and more efficient utilization of communication resources, among other benefits.
[0125] FIG. 7 shows a block diagram 700 of a device 705 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The device 705 may be an example of aspects of a device 605 or a UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. The device 705, or one or more components of the device 705 (e.g., the receiver 710, the transmitter 715, the communications manager 720) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0126] The receiver 710 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to resource pattern determination for device-to-reader transmissions) . Information may be passed on to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.
[0127] The transmitter 715 may provide a means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to resource pattern determination for device-to-reader transmissions) . In some examples, the transmitter 715 may be co-located with a receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.
[0128] The device 705, or various components thereof, may be an example of means for performing various aspects of resource pattern determination for device-to-reader transmissions as described herein. For example, the communications manager 720 may include a packet generation component 725, a feedback component 730, or both. The communications manager 720 may be an example of aspects of a communications manager 620 as described herein. In some examples, the communications manager 720, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 710, the transmitter 715, or both. For example, the communications manager 720 may receive information from the receiver 710, send information to the transmitter 715, or be integrated in combination with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.
[0129] The communications manager 720 may support wireless communication in accordance with examples as disclosed herein. The packet generation component 725 is capable of, configured to, or operable to support a means for transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device. Feedback component 730 is capable of, configured to, or operable to support a means for receiving, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message. The packet generation component 725 is capable of, configured to, or operable to support a means for transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0130] In some cases, the packet generation component 725 and the feedback component 730 may each be or be at least a part of a processor (e.g., a transceiver processor, or a radio processor, or a transmitter processor, or a receiver processor) . The processor may be coupled with memory and execute instructions stored in the memory that enable the processor to perform or facilitate the features of the packet generation component 725 and feedback component 730. discussed herein. A transceiver processor may be collocated with and / or communicate with (e.g., direct the operations of) a transceiver of the device. A radio processor may be collocated with and / or communicate with (e.g., direct the operations of) a radio (e.g., an NR radio, an LTE radio, a Wi-Fi radio) of the device. A transmitter processor may be collocated with and / or communicate with (e.g., direct the operations of) a transmitter of the device. A receiver processor may be collocated with and / or communicate with (e.g., direct the operations of) a receiver of the device.
[0131] FIG. 8 shows a block diagram 800 of a communications manager 820 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The communications manager 820 may be an example of aspects of a communications manager 620, a communications manager 720, or both, as described herein. The communications manager 820, or various components thereof, may be an example of means for performing various aspects of resource pattern determination for device-to-reader transmissions as described herein. For example, the communications manager 820 may include a packet generation component 825, a feedback component 830, a resource selection component 840, a chip rate component 845, a device ID component 850, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
[0132] The communications manager 820 may support wireless communication in accordance with examples as disclosed herein. The packet generation component 825 is capable of, configured to, or operable to support a means for transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device. The feedback component 830 is capable of, configured to, or operable to support a means for receiving, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message. The packet generation component 825 is capable of, configured to, or operable to support a means for transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0133] In some examples, the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each include a single index. In some examples, a value of the single index points a respective pair of a time resource and a frequency resource from among a sequence of candidate resource pairs across a time domain and a frequency domain, each resource pair of the sequence of candidate resource pairs associated with a respective value of the single index.
[0134] In some examples, the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each include a first index that points to a respective frequency resource from among a sequence of candidate frequency resources each associated with a respective value of the first index and a second index that points to a respective time resource from among a sequence of candidate time resources each associated with a respective value of the second index.
[0135] In some examples, to support transmitting the second message, the chip rate component 845 is capable of, configured to, or operable to support a means for transmitting the second message according to the second time and frequency resource allocation pattern and according to a first chip rate, where the second time and frequency resource allocation pattern is the same as the first time and frequency resource allocation pattern associated with the first message and the first chip rate is also used for transmitting the first message based on a common resource and chip rate configuration for transmissions by the wireless device.
[0136] In some examples, to support transmitting the second message, the chip rate component 845 is capable of, configured to, or operable to support a means for transmitting the second message according to the second time and frequency resource allocation pattern and according to a second chip rate, where the second time and frequency resource allocation pattern is different from the first time and frequency resource allocation pattern associated with the first message and the second chip rate is different from a first chip rate used for transmitting the first message in accordance with the second message including a second message type that is different from a first message type of the first message.
[0137] In some examples, the resource selection component 840 is capable of, configured to, or operable to support a means for selecting the first time resource and the first frequency resource from among multiple candidate time and frequency resources associated with the first time and frequency resource allocation pattern in accordance with at least a random selection, or in accordance with one or more selection parameters, or a combination thereof, where the one or more selection parameters include at least a device type associated with the wireless device, or a clock reliability associated with the wireless device, or a received signal power of one or more previously received messages, or a combination thereof, and where transmitting the first message via the first time resource and the first frequency resource is based on the selecting.
[0138] In some examples, to support receiving the second message, the packet generation component 825 is capable of, configured to, or operable to support a means for receiving, via the second message, an indication of the at least one second index associated with the second time and frequency resource allocation pattern, where transmitting the third message is in accordance with the indication.
[0139] In some examples, to support receiving the second message, the device ID component 850 is capable of, configured to, or operable to support a means for receiving, via the second message, a set of multiple device IDs associated with a set of multiple wireless devices, where an order of the set of multiple device IDs in the second message maps to an order of a set of multiple candidate time and frequency resources, and where transmitting the third message according to the at least one second index is based on a position of a device ID of the wireless device in the order of the set of multiple device IDs being mapped to the at least one second index in accordance with the second time and frequency resource allocation pattern.
[0140] In some examples, to support receiving the second message, the device ID component 850 is capable of, configured to, or operable to support a means for receiving, via the second message, IDs of one or more wireless devices associated with the one or more packets, of the set of multiple packets, that failed to be decoded and a bitmap including a set of multiple bits each associated with a respective time and frequency resource for a first message of a set of multiple multiplexed first messages including the set of multiple packets, where a first bit value of a bit in the bitmap indicates a respective message associated with the bit was successfully decoded and a second bit value different from the first bit value indicates the respective message was unsuccessfully decoded.
[0141] In some examples, to support receiving the second message, the device ID component 850 is capable of, configured to, or operable to support a means for receiving, via the second message, a set of multiple device IDs in an order that maps to the set of multiple packets, where one or more device IDs of the set of multiple device IDs include a default ID value that indicates a respective packet was successfully decoded, and where remaining device IDs of the set of multiple device IDs include IDs of one or more wireless devices associated with the one or more packets that were not successfully decoded.
[0142] In some examples, to support receiving the second message, the device ID component 850 is capable of, configured to, or operable to support a means for receiving, via the second message, one or more device IDs of one or more wireless devices associated with the one or more packets that were not successfully decoded and a respective index to a respective time and frequency resource associated with each of the one or more packets that were not successfully decoded.
[0143] In some examples, to support receiving the second message, the device ID component 850 is capable of, configured to, or operable to support a means for receiving, via the second message, one or more device IDs of one or more wireless devices associated with the one or more packets that failed to be decoded, one or more indexes to one or more time and frequency resources via which the one or more packets were transmitted, and an indication of the at least one second index to the second frequency resource and the second time resource for transmission of the second message and one or more other second messages that include retransmissions of the one or more packets.
[0144] In some examples, the wireless device includes at least one of an energy harvesting-capable device, or an ambient internet-of-things device, or both.
[0145] In some cases, the packet generation component 825 and the feedback component 830 may each be or be at least a part of a processor (e.g., a transceiver processor, or a radio processor, or a transmitter processor, or a receiver processor) . The processor may be coupled with memory and execute instructions stored in the memory that enable the processor to perform or facilitate the features of the packet generation component 825 and the feedback component 830 discussed herein.
[0146] FIG. 9 shows a diagram of a system 900 including a device 905 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The device 905 may be an example of or include components of a device 605, a device 705, or a UE 115 as described herein. The device 905 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof) . The device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 920, an input / output (I / O) controller, such as an I / O controller 910, a transceiver 915, one or more antennas 925, at least one memory 930, code 935, and at least one processor 940. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 945) .
[0147] The I / O controller 910 may manage input and output signals for the device 905. The I / O controller 910 may also manage peripherals not integrated into the device 905. In some cases, the I / O controller 910 may represent a physical connection or port to an external peripheral. In some cases, the I / O controller 910 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I / O controller 910 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 910 may be implemented as part of one or more processors, such as the at least one processor 940. In some cases, a user may interact with the device 905 via the I / O controller 910 or via hardware components controlled by the I / O controller 910.
[0148] In some cases, the device 905 may include a single antenna. However, in some other cases, the device 905 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 915 may communicate bi-directionally via the one or more antennas 925 using wired or wireless links as described herein. For example, the transceiver 915 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 915 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 925 for transmission, and to demodulate packets received from the one or more antennas 925. The transceiver 915, or the transceiver 915 and one or more antennas 925, may be an example of a transmitter 615, a transmitter 715, a receiver 610, a receiver 710, or any combination thereof or component thereof, as described herein.
[0149] The at least one memory 930 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 930 may store computer-readable, computer-executable, or processor-executable code, such as the code 935. The code 935 may include instructions that, when executed by the at least one processor 940, cause the device 905 to perform various functions described herein. The code 935 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 935 may not be directly executable by the at least one processor 940 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 930 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0150] The at least one processor 940 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs) , one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof) . In some cases, the at least one processor 940 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 940. The at least one processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting resource pattern determination for device-to-reader transmissions) . For example, the device 905 or a component of the device 905 may include at least one processor 940 and at least one memory 930 coupled with or to the at least one processor 940, the at least one processor 940 and the at least one memory 930 configured to perform various functions described herein.
[0151] In some examples, the at least one processor 940 may include multiple processors and the at least one memory 930 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions described herein. In some examples, the at least one processor 940 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 940) and memory circuitry (which may include the at least one memory 930) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 940 or a processing system including the at least one processor 940 may be configured to, configurable to, or operable to cause the device 905 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code 935 (e.g., processor-executable code) stored in the at least one memory 930 or otherwise, to perform one or more of the functions described herein.
[0152] The communications manager 920 may support wireless communication in accordance with examples as disclosed herein. For example, the communications manager 920 is capable of, configured to, or operable to support a means for transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device. The communications manager 920 is capable of, configured to, or operable to support a means for receiving, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message. The communications manager 920 is capable of, configured to, or operable to support a means for transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0153] By including or configuring the communications manager 920 in accordance with examples as described herein, the device 905 may support techniques for reduced latency, reduced power consumption, more efficient utilization of communication resources, improved coordination between devices, and longer battery life, improved utilization of processing capability, among other benefits.
[0154] In some examples, the communications manager 920 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 915, the one or more antennas 925, or any combination thereof. Although the communications manager 920 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 920 may be supported by or performed by the at least one processor 940, the at least one memory 930, the code 935, or any combination thereof. For example, the code 935 may include instructions executable by the at least one processor 940 to cause the device 905 to perform various aspects of resource pattern determination for device-to-reader transmissions as described herein, or the at least one processor 940 and the at least one memory 930 may be otherwise configured to, individually or collectively, perform or support such operations.
[0155] FIG. 10 shows a flowchart illustrating a method 1000 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The operations of the method 1000 may be implemented by a UE or its components as described herein. For example, the operations of the method 1000 may be performed by a UE 115 as described with reference to FIGs. 1 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0156] At 1005, the method may include transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device. The operations of 1005 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1005 may be performed by a packet generation component 825 as described with reference to FIG. 8.
[0157] At 1010, the method may include receiving, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message. The operations of 1010 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1010 may be performed by a feedback component 830 as described with reference to FIG. 8.
[0158] At 1015, the method may include transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message. The operations of 1015 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1015 may be performed by a packet generation component 825 as described with reference to FIG. 8.
[0159] FIG. 11 shows a flowchart illustrating a method 1100 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The operations of the method 1100 may be implemented by a UE or its components as described herein. For example, the operations of the method 1100 may be performed by a UE 115 as described with reference to FIGs. 1 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0160] At 1105, the method may include transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device. The operations of 1105 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1105 may be performed by a packet generation component 825 as described with reference to FIG. 8.
[0161] At 1110, the method may include selecting the first time resource and the first frequency resource from among a plurality of candidate time and frequency resources associated with the first time and frequency resource allocation pattern in accordance with at least a random selection, or in accordance with one or more selection parameters, or a combination thereof, where the one or more selection parameters include at least a device type associated with the wireless device, or a clock reliability associated with the wireless device, or a received signal power of one or more previously received messages, or a combination thereof, and where transmitting the first message via the first time resource and the first frequency resource is based on the selecting. The operations of 1110 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1110 may be performed by a resource selection component 840 as described with reference to FIG. 8.
[0162] At 1115, the method may include receiving, in response to the first message, a second message that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message. The operations of 1115 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1115 may be performed by a feedback component 830 as described with reference to FIG. 8.
[0163] At 1120, the method may include transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message. The operations of 1120 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1120 may be performed by a packet generation component 825 as described with reference to FIG. 8.
[0164] FIG. 12 shows a flowchart illustrating a method 1200 that supports resource pattern determination for device-to-reader transmissions in accordance with one or more aspects of the present disclosure. The operations of the method 1200 may be implemented by a UE or its components as described herein. For example, the operations of the method 1200 may be performed by a UE 115 as described with reference to FIGs. 1 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0165] At 1205, the method may include transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message including a first packet associated with the wireless device. The operations of 1205 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed by a packet generation component 825 as described with reference to FIG. 8.
[0166] At 1210, the method may include receiving, in response to the first message, a second message that indicates at least one second index associated with a second time and frequency resource allocation pattern and that indicates one or more packets, of a set of multiple packets, that failed to be decoded, the set of multiple packets including at least the first packet, where the set of multiple packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message. The operations of 1210 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1210 may be performed by a feedback component 830 as described with reference to FIG. 8.
[0167] At 1215, the method may include transmitting, via a second frequency resource and a second time resource indicated by the at least one second index associated with the second time and frequency resource allocation pattern, a third message that includes a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message, where transmitting the third message is in accordance with the indication and the second message. The operations of 1215 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1215 may be performed by a packet generation component 825 as described with reference to FIG. 8.
[0168] The following provides an overview of aspects of the present disclosure:
[0169] Aspect 1: A method for wireless communication by a wireless device, comprising: transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message comprising a first packet associated with the wireless device; receiving, in response to the first message, a second message that indicates one or more packets, of a plurality of packets, that failed to be decoded, the plurality of packets comprising at least the first packet, wherein the plurality of packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message; and transmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that comprises a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.
[0170] Aspect 2: The method of aspect 1, wherein the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each comprise a single index; and a value of the single index points a respective pair of a time resource and a frequency resource from among a sequence of candidate resource pairs across a time domain and a frequency domain, each resource pair of the sequence of candidate resource pairs associated with a respective value of the single index.
[0171] Aspect 3: The method of aspect 1, wherein the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each comprise a first index that points to a respective frequency resource from among a sequence of candidate frequency resources each associated with a respective value of the first index and a second index that points to a respective time resource from among a sequence of candidate time resources each associated with a respective value of the second index.
[0172] Aspect 4: The method of any of aspects 1 through 3, wherein transmitting the second message comprises: transmitting the second message according to the second time and frequency resource allocation pattern and according to a first chip rate, wherein the second time and frequency resource allocation pattern is the same as the first time and frequency resource allocation pattern associated with the first message and the first chip rate is also used for transmitting the first message based at least in part on a common resource and chip rate configuration for transmissions by the wireless device.
[0173] Aspect 5: The method of any of aspects 1 through 3, wherein transmitting the second message comprises: transmitting the second message according to the second time and frequency resource allocation pattern and according to a second chip rate, wherein the second time and frequency resource allocation pattern is different from the first time and frequency resource allocation pattern associated with the first message and the second chip rate is different from a first chip rate used for transmitting the first message in accordance with the second message comprising a second message type that is different from a first message type of the first message.
[0174] Aspect 6: The method of any of aspects 1 through 5, further comprising: selecting the first time and frequency resource allocation pattern from a plurality of candidate time and frequency resource allocation patterns supported by the wireless device in accordance with at least a random selection, or in accordance with one or more selection parameters, or a combination thereof, wherein the one or more selection parameters comprise at least a device type associated with the wireless device, or a clock reliability associated with the wireless device, or a received signal power of one or more previously received messages, or a combination thereof, and wherein transmitting the first message in accordance with the first time and frequency resource allocation pattern is based at least in part on the selecting.
[0175] Aspect 7: The method of any of aspects 1 through 5, wherein receiving the second message comprises: receiving, via the second message, an indication of the at least one second index associated with the second time and frequency resource allocation pattern, wherein transmitting the third message is in accordance with the indication.
[0176] Aspect 8: The method of any of aspects 1 through 5, wherein receiving the second message comprises: receiving, via the second message, a plurality of device IDs associated with a plurality of wireless devices, wherein an order of the plurality of device IDs in the second message maps to an order of a plurality of candidate time and frequency resources, and wherein transmitting the third message according to the at least one second index is based at least in part on a position of a device ID of the wireless device in the order of the plurality of device IDs being mapped to the at least one second index in accordance with the second time and frequency resource allocation pattern.
[0177] Aspect 9: The method of any of aspects 1 through 8, wherein receiving the second message comprises: receiving, via the second message, IDs of one or more wireless devices associated with the one or more packets, of the plurality of packets, that failed to be decoded and a bitmap comprising a plurality of bits each associated with a respective time and frequency resource for a first message of a plurality of multiplexed first messages comprising the plurality of packets, wherein a first bit value of a bit in the bitmap indicates a respective message associated with the bit was successfully decoded and a second bit value different from the first bit value indicates the respective message was unsuccessfully decoded.
[0178] Aspect 10: The method of any of aspects 1 through 8, wherein receiving the second message comprises: receiving, via the second message, a plurality of device IDs in an order that maps to the plurality of packets, wherein one or more device IDs of the plurality of device IDs comprise a default ID value that indicates a respective packet was successfully decoded, and wherein remaining device IDs of the plurality of device IDs comprise IDs of one or more wireless devices associated with the one or more packets that were not successfully decoded.
[0179] Aspect 11: The method of any of aspects 1 through 8, wherein receiving the second message comprises: receiving, via the second message, one or more device IDs of one or more wireless devices associated with the one or more packets that were not successfully decoded and a respective index to a respective time and frequency resource associated with each of the one or more packets that were not successfully decoded.
[0180] Aspect 12: The method of any of aspects 1 through 5, wherein receiving the second message comprises: receiving, via the second message, one or more device IDs of one or more wireless devices associated with the one or more packets that failed to be decoded, one or more indexes to one or more time and frequency resources via which the one or more packets were transmitted, and an indication of the at least one second index to the second frequency resource and the second time resource for transmission of the second message and one or more other second messages that comprise retransmissions of the one or more packets.
[0181] Aspect 13: The method of any of aspects 1 through 12, wherein the first wireless device comprises at least one of an EH-capable device, or an A-IoT device, or both.
[0182] Aspect 14: A wireless device for wireless communication, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the wireless device to perform a method of any of aspects 1 through 13.
[0183] Aspect 15: A wireless device for wireless communication, comprising at least one means for performing a method of any of aspects 1 through 13.
[0184] Aspect 16: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 13.
[0185] It should be noted that the methods described herein describe possible implementations. The operations and the steps may be rearranged or otherwise modified and other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0186] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications 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, as well as other systems and radio technologies not explicitly mentioned herein.
[0187] 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 referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0188] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, a graphics processing unit (GPU) , a neural processing unit (NPU) , 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.
[0189] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0190] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.
[0191] As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such 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) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”
[0192] As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “acomponent” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”
[0193] The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database, or another data structure) , ascertaining, and the like. Also, “determining” can include receiving (e.g., receiving information) , accessing (e.g., accessing data stored in memory) , and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.
[0194] In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference label.
[0195] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some figures, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.
[0196] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A wireless device, comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories, wherein the one or more processors are individually or collectively operable to execute the code to cause the wireless device to:transmit, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message comprising a first packet associated with the wireless device;receive, in response to the first message, a second message that indicates one or more packets, of a plurality of packets, that failed to be decoded, the plurality of packets comprising at least the first packet, wherein the plurality of packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message; andtransmit, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that comprises a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.2.The wireless device of claim 1, wherein:the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each comprise a single index; anda value of the single index points a respective pair of a time resource and a frequency resource from among a sequence of candidate resource pairs across a time domain and a frequency domain, each resource pair of the sequence of candidate resource pairs associated with a respective value of the single index.3.The wireless device of claim 1, wherein the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each comprise a first index that points to a respective frequency resource from among a sequence of candidate frequency resources each associated with a respective value of the first index and a second index that points to a respective time resource from among a sequence of candidate time resources each associated with a respective value of the second index.4.The wireless device of claim 1, wherein the one or more processors are individually or collectively configured to cause the wireless device to transmit the second message by being individually or collectively configured to cause the wireless device to:transmit the second message according to the second time and frequency resource allocation pattern and according to a first chip rate, wherein the second time and frequency resource allocation pattern is the same as the first time and frequency resource allocation pattern associated with the first message and the first chip rate is also used for transmitting the first message based at least in part on a common resource and chip rate configuration for transmissions by the wireless device.5.The wireless device of claim 1, wherein the one or more processors are individually or collectively configured to cause the wireless device to transmit the second message by being individually or collectively configured to cause the wireless device to:transmit the second message according to the second time and frequency resource allocation pattern and according to a second chip rate, wherein the second time and frequency resource allocation pattern is different from the first time and frequency resource allocation pattern associated with the first message and the second chip rate is different from a first chip rate used for transmitting the first message in accordance with the second message comprising a second message type that is different from a first message type of the first message.6.The wireless device of claim 1, wherein the one or more processors are individually or collectively further configured to cause the wireless device to:select the first time resource and the first frequency resource from a plurality of candidate time and frequency resources associated with the first time and frequency resource allocation pattern in accordance with at least a random selection, or in accordance with one or more selection parameters, or a combination thereof, wherein the one or more selection parameters comprise at least a device type associated with the wireless device, or a clock reliability associated with the wireless device, or a received signal power of one or more previously received messages, or a combination thereof, and wherein transmitting the first message via the first time resource and the first frequency resource in accordance with the first time and frequency resource allocation pattern is based at least in part on the selecting.7.The wireless device of claim 1, wherein the one or more processors are individually or collectively configured to cause the wireless device to receive the second message by being individually or collectively configured to cause the wireless device to:receive, via the second message, an indication of the at least one second index associated with the second time and frequency resource allocation pattern, wherein transmitting the third message is in accordance with the indication.8.The wireless device of claim 1, wherein the one or more processors are individually or collectively configured to cause the wireless device to receive the second message by being individually or collectively configured to cause the wireless device to:receive, via the second message, a plurality of device IDs associated with a plurality of wireless devices, wherein an order of the plurality of device IDs in the second message maps to an order of a plurality of candidate time and frequency resources, and wherein transmitting the third message according to the at least one second index is based at least in part on a position of a device ID of the wireless device in the order of the plurality of device IDs being mapped to the at least one second index in accordance with the second time and frequency resource allocation pattern.9.The wireless device of claim 1, wherein the one or more processors are individually or collectively configured to cause the wireless device to receive the second message by being individually or collectively configured to cause the wireless device to:receive, via the second message, IDs of one or more wireless devices associated with the one or more packets, of the plurality of packets, that failed to be decoded and a bitmap comprising a plurality of bits each associated with a respective time and frequency resource for a first message of a plurality of multiplexed first messages comprising the plurality of packets, wherein a first bit value of a bit in the bitmap indicates a respective message associated with the bit was successfully decoded and a second bit value different from the first bit value indicates the respective message was unsuccessfully decoded.10.The wireless device of claim 1, wherein the one or more processors are individually or collectively configured to cause the wireless device to receive the second message by being individually or collectively configured to cause the wireless device to:receive, via the second message, a plurality of device IDs in an order that maps to the plurality of packets, wherein one or more device IDs of the plurality of device IDs comprise a default ID value that indicates a respective packet was successfully decoded, and wherein remaining device IDs of the plurality of device IDs comprise IDs of one or more wireless devices associated with the one or more packets that were not successfully decoded.11.The wireless device of claim 1, wherein the one or more processors are individually or collectively configured to cause the wireless device to receive the second message by being individually or collectively configured to cause the wireless device to:receive, via the second message, one or more device IDs of one or more wireless devices associated with the one or more packets that were not successfully decoded and a respective index to a respective time and frequency resource associated with each of the one or more packets that were not successfully decoded.12.The wireless device of claim 1, wherein the one or more processors are individually or collectively configured to cause the wireless device to receive the second message by being individually or collectively configured to cause the wireless device to:receive, via the second message, one or more device IDs of one or more wireless devices associated with the one or more packets that failed to be decoded, one or more indexes to one or more time and frequency resources via which the one or more packets were transmitted, and an indication of the at least one second index to the second frequency resource and the second time resource for transmission of the second message and one or more other second messages that comprise retransmissions of the one or more packets.13.The wireless device of claim 1, wherein the wireless device comprises at least one of an energy harvesting-capable device, or an ambient internet-of-things device, or both.14.A method for wireless communication by a wireless device, comprising:transmitting, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message comprising a first packet associated with the wireless device;receiving, in response to the first message, a second message that indicates one or more packets, of a plurality of packets, that failed to be decoded, the plurality of packets comprising at least the first packet, wherein the plurality of packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message; andtransmitting, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that comprises a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.15.The method of claim 14, wherein:the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each comprise a single index; anda value of the single index points a respective pair of a time resource and a frequency resource from among a sequence of candidate resource pairs across a time domain and a frequency domain, each resource pair of the sequence of candidate resource pairs associated with a respective value of the single index.16.The method of claim 14, wherein the first time and frequency resource allocation pattern, the second time and frequency resource allocation pattern, or both, each comprise a first index that points to a respective frequency resource from among a sequence of candidate frequency resources each associated with a respective value of the first index and a second index that points to a respective time resource from among a sequence of candidate time resources each associated with a respective value of the second index.17.The method of claim 14, wherein transmitting the second message comprises:transmitting the second message according to the second time and frequency resource allocation pattern and according to a first chip rate, wherein the second time and frequency resource allocation pattern is the same as the first time and frequency resource allocation pattern associated with the first message and the first chip rate is also used for transmitting the first message based at least in part on a common resource and chip rate configuration for transmissions by the wireless device.18.The method of claim 14, wherein transmitting the second message comprises:transmitting the second message according to the second time and frequency resource allocation pattern and according to a second chip rate, wherein the second time and frequency resource allocation pattern is different from the first time and frequency resource allocation pattern associated with the first message and the second chip rate is different from a first chip rate used for transmitting the first message in accordance with the second message comprising a second message type that is different from a first message type of the first message.19.The method of claim 14, further comprising:selecting the first time resource and the first frequency resource from among a plurality of candidate time and frequency resources associated with the first time and frequency resource allocation pattern in accordance with at least a random selection, or in accordance with one or more selection parameters, or a combination thereof, wherein the one or more selection parameters comprise at least a device type associated with the wireless device, or a clock reliability associated with the wireless device, or a received signal power of one or more previously received messages, or a combination thereof, and wherein transmitting the first message in accordance with the first time resource and the first frequency resource is based at least in part on the selecting.20.A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to:transmit, via a first time resource and a first frequency resource indicated by at least one first index associated with a first time and frequency resource allocation pattern, a first message comprising a first packet associated with a wireless device;receive, in response to the first message, a second message that indicates one or more packets, of a plurality of packets, that failed to be decoded, the plurality of packets comprising at least the first packet, wherein the plurality of packets is transmitted via the first message and one or more other messages multiplexed in frequency with the first message; andtransmit, via a second frequency resource and a second time resource indicated by at least one second index associated with a second time and frequency resource allocation pattern, a third message that comprises a second packet associated with the wireless device or a retransmission of the first packet in accordance with the one or more packets indicated via the second message.