WO2022067837A1

WO2022067837A1 - Control signaling for rateless codes with feedback

Info

Publication number: WO2022067837A1
Application number: PCT/CN2020/119770
Authority: WO
Inventors: Kangqi LIU; Liangming WU; Yu Zhang; Chao Wei; Chenxi HAO; Min Huang; Qiaoyu Li; Hao Xu; Wei XI; Rui Hu
Original assignee: Qualcomm Incorporated
Priority date: 2020-10-01
Filing date: 2020-10-01
Publication date: 2022-04-07

Abstract

Methods, systems, and devices for wireless communications are described. A base station may transmit control signaling to a user equipment (UE), the control signaling including scheduling information for a downlink message encoded using a rateless coding scheme and an indication of uplink resources allocated for feedback for the downlink message. The UE may monitor for the downlink message based on receiving the control signaling. The UE may receive one or more encoded packets of the downlink message based on the monitoring. The UE may transmit one or more feedback messages using the uplink resources. In some examples, the base station may terminate the transmission of rateless coding scheme downlink message early based on receiving a positive feedback message or may transmit additional encoded packets based on receiving a negative feedback message.

Description

CONTROL SIGNALING FOR RATELESS CODES WITH FEEDBACK

FIELD OF TECHNOLOGY

The following relates to wireless communications, including control signaling for rateless codes with feedback.

BACKGROUND

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 or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support control signaling for rateless codes with feedback. Generally, the described techniques provide for a base station to transmit control signaling to a user equipment (UE) , the control signaling including scheduling information for a downlink message encoded using a rateless coding scheme and an indication of uplink resources allocated for feedback for the downlink message. The UE may monitor for the downlink message based on receiving the control signaling. The UE may receive one or more encoded packets of the downlink message based on the monitoring. For example, the UE may monitor for a set of encoded packets of the downlink message, may transmit a feedback message, and may subsequently monitor for another set of encoded packets of the downlink message. In some other examples, the UE may monitor for a set of encoded packets of the downlink message and may transmit a feedback message independent of the number of packets in the set. In some examples, the UE may transmit a feedback message for packets received during multiple control signaling periods. The UE may transmit one or more feedback messages using the uplink resources. In some examples, the base station may terminate the transmission of rateless coding scheme downlink message early based on receiving a positive feedback message or may transmit additional encoded packets based on receiving a negative feedback message.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGs. 1 and 2 illustrate examples of wireless communications systems that support control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIGs. 3A through 3C, 4A, and 4B illustrate examples of timelines that support control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIG. 5 illustrates an example of a process flow that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIGs. 6 and 7 show block diagrams of devices that support control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIG. 8 shows a block diagram of a communications manager that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIG. 9 shows a diagram of a system including a device that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIGs. 10 and 11 show block diagrams of devices that support control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIG. 12 shows a block diagram of a communications manager that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIG. 13 shows a diagram of a system including a device that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

FIGs. 14 through 18 show flowcharts illustrating methods that support control signaling for rateless codes with feedback in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

In some examples, a user equipment (UE) may communicate with a base station using a rateless coding scheme, which may also be referred to as a network code or a fountain code. For example, the base station may encode a data transmission to the UE by applying the rateless coding scheme at a network layer. A data transmission encoded using the rateless coding scheme may include multiple encoded packets. The encoded packets may be decoded by the UE if the number of encoded packets is larger than the number of sources packets. However, a UE receiving encoded packets based on the rateless coding scheme may not provide feedback to the baes station indicating whether the encoded packets were received successfully, which may cause unnecessary decoding and transmitting of additional packets if the UE has successfully decoded a sufficient number of packets to decode the data transmission or a lack of indication that one or more packets should be transmitted if the UE decodes the transmitted packets but does not successfully decode a sufficient number of packets to decode the transmission.

As described herein, a base station may transmit control signaling to a UE including an indication of one or more uplink resources allocated for the UE to provide feedback to the base station for a downlink message (e.g., a data transmission) encoded using a rateless coding scheme. In some cases, a base station may transmit control information to a UE (e.g., in a downlink control information (DCI) message) including a scheduling grant indicating one or more resources, such as time-frequency resources, for a downlink message and an indication of one or more uplink resources allocated for the UE to provide feedback for the downlink message. In some cases, the downlink message may include multiple encoded packets, such as one or more sets of encoded packets. The UE may monitor for the downlink message during the resources indicated in the scheduling grant. In some examples, the UE may receive the one or more sets of encoded packets while monitoring. The UE may transmit a feedback message after each set of encoded packets. Additionally or alternatively, the UE may transmit the feedback message after receiving one or more encoded packets of the data transmission and may receive additional encoded packets of the data transmission after transmitting the feedback message (e.g., regardless of the set of encoded packets) . In some cases, the UE may transmit the feedback message after receiving additional control signaling (e.g., after receiving more than one DCI message) . The base station may configure the feedback message according to a semi-persistent scheduling (SPS) configuration or a dynamic scheduling configuration. In some examples, the base station may terminate the data transmission early based on receiving a positive feedback message (e.g., an acknowledgement (ACK) ) , or may transmit additional encoded packets based on receiving a negative feedback message (e.g., a negative acknowledgement (NACK) ) .

Particular aspects of the subject matter described in this disclosure may be implemented to realize one or more of the following potential advantages. The techniques employed by the described UEs may provide benefits and enhancements to the operation of the UEs. For example, operations performed by the UEs may provide improvements to wireless operations. Implementing various aspects of this disclosure may allow for a base station to transmit control signaling to a UE including a scheduling grant for a downlink message and an indication of one or more uplink resources allocated for feedback for the downlink message, which may be an ACK or a NACK for a data transmission encoded using a rateless coding scheme. Transmitting a feedback message based on receiving a data transmission encoded using the rateless coding scheme may reduce signaling overhead at the UE. For example, a UE may terminate decoding of one or more packets of the data transmission early based on transmitting an ACK or may receive one or more additional packets based on transmitting a NACK while ensuring reliable and efficient communications between UEs and base stations, among other benefits.

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 timelines and a process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to control signaling for rateless codes with feedback.

FIG. 1 illustrates an example of a wireless communications system 100 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

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

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 able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.

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

One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.

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, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 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.

The UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling 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.

In some examples (e.g., in a carrier aggregation configuration) , a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) and may be positioned according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology) .

The communication links 125 shown in the wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .

A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a number of determined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the base stations 105, the UEs 115, or both) may have hardware configurations that support communications over a particular carrier bandwidth or may be configurable to support communications over one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include base stations 105 or UEs 115 that support simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating over portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.

Signal waveforms transmitted over 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 consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) . Thus, the more resource elements that a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. A wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.

One or more numerologies for a carrier may be supported, where a numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.

The time intervals for the base stations 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 T _s=1/ (Δf _max·N _f) seconds, where Δf _max may represent the maximum supported subcarrier spacing, and N _f may represent the maximum 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) .

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 number of slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing. Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems 100, a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N _f) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

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., the number 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) ) .

Physical channels may be multiplexed on a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed on 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 number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., 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 a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.

Each base station 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) . In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.

A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a lower-powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) . A base station 105 may support one or multiple cells and may also support communications over the one or more cells using one or multiple component carriers.

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

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

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

Some UEs 115, such as MTC or IoT devices, may be 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 base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that makes use of 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.

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 simultaneously) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for the UEs 115 include entering a power saving deep sleep mode when not engaging in active communications, operating over 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.

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) or mission critical communications. The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) . Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) . Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol) . One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105. In some examples, groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group. In some examples, a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.

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

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 base stations 105 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.

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

The wireless communications system 100 may operate using one or more frequency bands, typically 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. The UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. The transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

The wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band, or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band. In some examples, the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the base stations 105, and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate use of antenna arrays within a device. The propagation of EHF transmissions, however, may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.

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

A base station 105 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 base station 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 base station 105 may be located in diverse geographic locations. A base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.

The base stations 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) . Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) , where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , where multiple spatial layers are transmitted to multiple devices.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at 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) .

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

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

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

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

The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels. A Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting radio bearers for user plane data. At the physical layer, transport channels may be mapped to physical channels.

The UEs 115 and the base stations 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 over a communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) . HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions) . In some examples, a device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.

In some cases, a base station 105 may encode a downlink message, such as a data transmission, using a rateless coding scheme. For example, the base station 105 may use a fountain code to transmit packets of a downlink message that may be recovered by a receiver, such as a UE 115, if the number of received packets is larger than the number of sources packets (e.g., regardless of which packets are received) . The base station 105 may transmit the encoded downlink message to the UE. At the receiving side, one or more encoded symbols for each packet may be decoded correctly or discarded. The transmitting device and the receiving device may determine which sources symbols may have been selected to generate the encoded symbol based on correctly decoding the symbols or discarding the symbols. In some cases, a base station 105 may not perform retransmissions for a downlink message encoded using a rateless coding scheme. Thus, the UE 115 may not provide a feedback message based on a number of encoded packets of the downlink message (e.g., an ACK message or a NACK message for HARQ feedback) , which may cause unnecessary decoding and transmitting of additional packets if the UE 115 has successfully decoded a sufficient number of packets to decode the downlink message or a lack of indication that one or more packets should be transmitted if the UE 115 decodes the transmitted packets but does not successfully decode a sufficient number of packets to decode the downlink message.

In some examples, a base station 105 may transmit control signaling to the UE 115 including scheduling information for a downlink message encoded using a rateless coding scheme and an indication of uplink resources allocated for feedback for the downlink message. The UE 115 may monitor for the downlink message based on receiving the control signaling. The UE 115 may receive one or more encoded packets of the downlink message based on the monitoring. For example, the UE 115 may monitor for a set of encoded packets of the downlink message, may transmit a feedback message, and may subsequently monitor for another set of encoded packets of the downlink message, which is described in further detail with reference to FIG. 3A. In some other examples, the UE 115 may monitor for a set of encoded packets of the downlink message and may transmit a feedback message independent of the number of packets in the set, which is described in further detail with reference to FIG. 3B. In some examples, the UE 115 may transmit a feedback message for packets received during multiple control signaling periods (e.g., after receiving multiple DCI messages) , which is described in further detail with reference to FIG. 3C.

In some examples, the UE 115 may transmit one or more feedback messages using the uplink resources. In some cases, the uplink resources may be configured according to an SPS configuration, which is described in further detail with reference to FIG. 4A. In some other cases, the uplink resources may be configured with a dynamic period, which is described in further detail with reference to FIG. 4B. The feedback message may include a positive feedback message (e.g., an ACK) if the downlink message is decoded successfully or a negative feedback message (e.g., a NACK) if the downlink message is not decoded successfully by the UE 115. In some examples, the base station 105 may terminate the transmission of rateless coding scheme downlink message early based on receiving a positive feedback message or may transmit additional encoded packets based on receiving a negative feedback message.

FIG. 2 illustrates an example of a wireless communications system 200 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. In some examples, wireless communications system 200 may implement aspects of wireless communications system 100 and may include UE 115-a and base station 105-a with coverage area 110-a, which may be examples of a UE 115 and a base station 105 with a coverage area 110 as described with reference to FIG. 1. In some examples, base station 105-a may communicate control signaling or data with a UE 115, such as UE 115-a, using a downlink communication link 205. Additionally or alternatively, the UE 115 may communicate control signaling or data with the base station 105-a using an uplink communication link 210. In some cases, base station 105-b may transmit control signaling to UE 115-a with scheduling information 215 and an indication of uplink resources 220 allocated for one or more feedback messages 225 for a downlink message (e.g., a data transmission) encoded using a rateless coding scheme, which may be referred to as a rateless coding scheme downlink message 230.

In some cases, a base station 105, such as base station 105-a, may encode a downlink message, such as a data transmission, using a rateless coding scheme. For example, base station 105-a may use a fountain code to transmit packets of a downlink message that may be recovered by a receiver, such as UE 115-a, if the number of received packets is larger than the number of sources packets (e.g., regardless of which packets are received) . In some examples, base station 105-a may implement a Luby transform (LT) fountain code, a Raptor code (e.g., an enhanced code based on variations of low-density parity-check (LDPC) and LT codes) , and the like. In some examples, a fountain code may be referred to as a network code because the fountain code may be applied in a network layer. A fountain code, such as a Raptor code, may be applied for multimedia broadcast multicast services (MBMS) , implemented by an IAB, or the like.

The base station 105 may transmit the encoded downlink message to a UE. At the receiving side, one or more encoded symbols for each packet may be decoded correctly or discarded. This approach permits a block number (e.g., a source block number (SBN) ) , a symbol identifier (e.g., an electronic symbol identifier (ESI) ) , or both for the packet to be added as a header file to the encoded symbols. In some cases, the SBN may include an integer identifier for the source block (e.g., the column of an original generator matrix used for encoding the downlink message) that the encoded symbols relate to. The ESI may include an integer identifier for the encoding symbols within the packet. Each encoded packet may include the SBN (e.g., the first 16 bits) , the ESI (e.g., the last 16 bits) , and one or more of the encoding symbols. The transmitting device and the receiving device may determine which sources symbols (e.g., which column of the original generator matrix) may have been selected to generate the encoded symbol based on the SBN, the ESI, or both.

In some examples, a fountain code may be a rateless code with an unlimited number of columns in a generator matrix during an encoding process. For example, the transmitting device may have K symbols for a transmission to the receiving device. The original generator matrix may therefore be generated with K rows (e.g., with K symbols) and, as the fountain code is a rateless code, a potentially infinite number of columns. The number of transmitted packets may correspond to the formula:

In some case, for an ARQ scheme, the original generator matrix may begin with the unit matrix.

The recovered packets (e.g., the received packets) may correspond to the formula:

The condition or scenario for the receiving device to recover the packets may include G′ according to the received packets being invertible or the rank of G′ being K. A design rule for the original generator matrix is that G′ is invertible with minimum N.

With respect to LT codes, efficient methods may be utilized to realize the function of fountain codes. For example, the encoding process for each encoding symbol may include the transmitting device randomly choosing a degree d _i from a degree distribution and randomly choosing d _i distinct source symbols with uniform distribution and performing an exclusive or (XOR) function on them.

At the receiving device, the decoding process may include a belief propagation technique, gaussian elimination process, and the like. For example, the receiving device may find an encoding symbol t _j that is connected to one source symbol S _i. The receiving device may set S _i to t _j, XOR S _i to all encoding symbols that are connected to S _i, and remove all edges connected to the source symbol S _i. The receiving device may repeat this until all S _i are determined. If there are no encoding symbols that are connected to one source symbol, then the decoding process fails.

Raptor codes generally reduce the encoding and decoding complexity of LT codes by reducing the average degree (e.g., LDPC plus weak LT code with a small averaging degree, such as three) . The precoding process may include generating some redundant symbols, such as S LDPC symbols (each source symbol will appear three times in all LDPC symbols) and H half symbols (each encoding symbol containing ceiling (H/2) source symbols) . The encoding process for each encoding symbol may include randomly choosing a degree d _i from a degree distribution, e.g., may choose d _i distinct source symbols and XOR them. The number of redundant symbols may be based on the first K intermediate symbols.

The data partitioning and encoding process may be based on the different layers of the protocol stack of the transmitting device. For example, N _d bits of data may be received at the PDCP layer. The N _d bits may be partitioned into l packets with N _bbits per packet (e.g., each of S ₀, S ₁, S ₃, ..., S _l-2, S _l-1 may correspond to an N _b-bit packet) . In the RLC layer, an erasure correction code (such as fountain codes or rateless coding) may be used to encode across the l packets to generate a stream of L encoded packets (e.g., packets of P ₀, P ₁, P ₂, P ₃, ..., P _L-1) . At the MAC layer or physical layer, each packet may include N _S symbols after error-correction, coding and modulation (e.g., each packet P may include X ₀, X ₁, X ₂, ..., X _Ns-1) . Each information symbol may include Q bits (e.g., N _b ≤ N _SQ) .

In some cases, a base station 105 may not perform retransmissions for a downlink message encoded using a rateless coding scheme. Thus, the UE 115 may not provide a feedback message 225 based on a number of encoded packets of the downlink message (e.g., an ACK message or a NACK message for HARQ feedback) , which may cause unnecessary decoding and transmitting of additional packets if the UE 115 has successfully decoded a sufficient number of packets to decode the downlink message or a lack of indication that one or more packets should be transmitted if the UE 115 decodes the transmitted packets but does not successfully decode a sufficient number of packets to decode the downlink message.

In some examples, a base station 105 may transmit control signaling to the UE 115 including scheduling information 215 for a downlink message, such as a data transmission, encoded using a rateless coding scheme (e.g., a rateless coding scheme downlink message 230) and an indication of uplink resources 220 for a feedback message 225. For example, base station 105-a may transmit the scheduling information 215 to UE 115-a via downlink communication link 205. The scheduling information 215 may include one or more time-frequency resources used to receive a rateless coding scheme downlink message 230. Base station 105-a may transmit an indication of uplink resources 220 via downlink communication link 205. In some cases, the uplink resources 220 may be allocated for one or more feedback messages 225 for the rateless coding scheme downlink message 230. In some cases, UE 115-a may monitor for the downlink message at 235 based on receiving control signaling including the scheduling information 215 and the indication of the uplink resources 220. UE 115-a may receive one or more encoded packets of the rateless coding scheme downlink message 230 based on monitoring at 235, which is described in further detail with respect to FIG. 3A through FIG. 3C, FIG. 4A, and FIG. 4B.

For example, UE 115-a may monitor for a set of encoded packets of the rateless coding scheme downlink message 230, may transmit a feedback message 225, and may subsequently monitor for another set of encoded packets of the rateless coding scheme downlink message 230, which is described in further detail with reference to FIG. 3A. In some other examples, UE 115-a may monitor for a set of encoded packets of the rateless coding scheme downlink message 230 and may transmit a feedback message 225 independent of the number of packets in the set, which is described in further detail with reference to FIG. 3B. In some examples, UE 115-a may transmit a feedback message 225 for packets received during multiple control signaling periods (e.g., after receiving multiple DCI messages) , which is described in further detail with reference to FIG. 3C.

In some examples, UE 115-a may transmit the feedback message 225 using the uplink resources included in the indication of uplink resources 220. In some cases, the uplink resources 220 may be configured according to an SPS configuration, which is described in further detail with reference to FIG. 4A. In some other cases, the uplink resources 220 may be configured with a dynamic period, which is described in further detail with reference to FIG. 4B. The feedback message 225 may include a positive feedback message (e.g., an ACK) if the downlink message is decoded successfully or a negative feedback message (e.g., a NACK) if the downlink message is not decoded successfully by UE 115-a. In some examples, base station 105-a may terminate the transmission of rateless coding scheme downlink message 230 early based on receiving a positive feedback message or may transmit additional encoded packets based on receiving a negative feedback message.

FIGs. 3A through 3C illustrate examples of timelines 300 that support control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. In some examples, timelines 300 may implement aspects of wireless communications system 100, wireless communications system 200, or both. Timelines 300 may be implemented by a UE 115 and a base station 105 in a rateless coding scheme downlink message feedback procedure, as described with reference to FIGs. 1 and 2. For example, timeline 300-a may illustrate a process in which a UE 115 may monitor for a set of encoded packets of the rateless coding scheme downlink message, may transmit a feedback message, and may subsequently monitor for another set of encoded packets of the rateless coding scheme downlink message. Timeline 300-b may illustrate a process in which a UE 115 may monitor for a set of encoded packets of the rateless coding scheme downlink message and may transmit a feedback message independent of the number of packets in the set. Timeline 300-c may illustrate a process in which a UE 115 may transmit a feedback message for packets received during multiple control signaling periods (e.g., after receiving multiple DCI messages) .

In some cases, a base station 105 may transmit control signaling, such as one or more DCI messages 305, that include a scheduling grant for a downlink message, a set of uplink resources allocated for one or more feedback messages 310, or both. In some cases, each DCI message 305 (e.g., an SPS DCI message or a dynamic period DCI message) may schedule multiple downlink shared channel transmissions, such as physical downlink shared channel (PDSCH) transmissions. In some examples, the DCI message 305 may include a downlink assignment index (DAI) transmit power control (TPC) command for a scheduled uplink control channel, such as a physical uplink control channel (PUCCH) , an uplink control channel resource indicator, a downlink shared channel to HARQ (e.g., PDSCH-to-HARQ) feedback timing indicator, or a combination.

The base station 105 may encode the downlink message according to a rateless coding scheme. The base station 105 may transmit the downlink message to the UE 115. The UE 115 may receive one or more sets of packets encoded using the rateless coding scheme including the information from the downlink message. For example, the UE 115 may receive one or more encoded packets 310 of a set of encoded packets during the resources indicated in the scheduling grant (e.g., time-frequency resources) . Each encoded packet 310 may include a number of symbols. In some cases, the UE 115 may transmit a feedback message 315 based on successfully or unsuccessfully decoding the one or more encoded packets 310. The base station 105 may receive the feedback message 315 in the one or more uplink resources indicated in a DCI message 305. For example, the UE 115 may transmit the feedback message 315 indicating positive feedback (e.g., an ACK) or negative feedback (e.g., a NACK) in uplink control information (UCI) . The base station 105 may use the feedback from the previous period to dynamically determine the number of encoded packets 310 to transmit to UE 115.

In some examples, the base station 105 may terminate transmission of encoded packets 310 early based on receiving a feedback message 315. For example, if the number of encoded packets 310 received by the UE 115 is larger than or equal to the number of encoded packets 310 the UE 115 uses to decode the downlink message, then the UE 115 may transmit an ACK to the base station 105. The base station 105 may terminate transmission of encoded packets 310 after receiving the ACK. In some other examples, the base station 105 may transmit one or more additional encoded packets 310 based on receiving the feedback message 315. For example, if the number of encoded packets 310 received by the UE 115 for a downlink message is less than the number of encoded packets 310 the UE 115 uses to decode the downlink message, then the UE 115 may transmit a NACK to the base station 105. The base station 105 may transmit additional encoded packets 310 based on receiving the NACK. In some cases, to reduce signaling overhead associated with transmitting the feedback message 315, the UE 115 may include the number of ACK or NACK encoded packets in the feedback message 315.

In some cases, as illustrated in FIG. 3A, the UE 115 may receive DCI message 305-a, which may include a scheduling grant for a downlink message and an indication of one or more uplink resources allocated for feedback message 315-a. The UE 115 may monitor for and receive a set of encoded packets 310 of the downlink message based on the scheduling grant in DCI message 305-a. The UE 115 may transmit feedback message 315-a based on receiving the set of encoded packets 310. In some examples, the base station 105 may wait to transmit the next set of encoded packets 310 for the downlink message until receiving the feedback message 315-a for the initial set of encoded packets 310. For example, the base station 105 may transmit an additional DCI message 305, such as DCI message 305-b, based on receiving feedback message 315-a. In some cases, DCI message 305-b may include an additional scheduling grant, another indication of one or more resources allocated for a feedback message 315, or both.

In some other cases, as illustrated in FIG. 3B, the UE 115 may transmit a feedback message 315 regardless of the number of encoded packets 310 in a set of encoded packets. That is, the feedback message 315 may not be scheduled at the end of each set of encoded packets. For example, the UE 115 may receive DCI 305-c including a scheduling grant for a downlink message and an indication of one or more uplink resources allocated for feedback message 315-b. The UE 115 may monitor for encoded packets 310 based on the scheduling grant. The UE 115 may receive the encoded packets 310 and transmit feedback message 315-b during the one or more of the indicated uplink resources. In some examples, the UE 115 may receive additional encoded packets 310, such as encoded packet 310-a, that belong to the initial set of encoded packets after transmitting feedback message 315-b. The UE 115 may receive additional control signaling (e.g., DCI 305-d) scheduling another set of encoded packets after receiving the encoded packets 310 in the initial set of encoded packets.

In some examples, as illustrated in FIG. 3C, DCI message 305-e may include a scheduling grant for a downlink message but may not include an indication of a set of uplink resources allocated for one or more feedback messages 315. Thus, the UE 115 may not transmit a feedback message 315 for time periods of DCI messages 305 that do not include an indication of one or more uplink resources for the feedback message 315. The UE 115 may receive encoded packets 310 during resources indicated by the scheduling grant in each DCI message 305, but may wait for multiple DCI periods before transmitting a feedback message 315. For example, DCI message 305-f may include a scheduling grant for a downlink message and an indication of one or more uplink resources allocated for feedback message 315-c. The UE 115 may transmit feedback message 315-c during one or more of the indicated uplink resources.

FIGs. 4A and 4B illustrate examples of timelines 400 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. In some examples, timelines 400 may implement aspects of wireless communications system 100, wireless communications system 200, timelines 300, or a combination. Timelines 400 may be implemented by a UE 115 and a base station 105 in a rateless coding scheme downlink message feedback procedure, as described with reference to FIGs. 1, 2, and 3. In some cases, a base station 105 may transmit a DCI message 405 to a UE 115 including a set of uplink resources allocated for one or more feedback messages 410. For example, timeline 400-a may illustrate a process in which the uplink resources may be configured according to an SPS configuration. Timeline 400-b may illustrate a process in which the uplink resources may be configured with a dynamic period.

In some cases, a base station 105 may transmit control signaling, such as one or more DCI messages 405, that include a scheduling grant for a downlink message, uplink resources allocated for one or more feedback messages 410, or both. In some cases, each DCI message 405 (e.g., an SPS DCI message or a dynamic period DCI message) may schedule multiple downlink shared channel transmissions, such as PDSCH transmissions. In some examples, as illustrated with reference to FIG. 4A, the base station 105 may configure the uplink resources allocated for one or more feedback messages 410 according to an SPS configuration. That is, the base station 105 may determine a period between uplink resources allocated for the feedback messages 315. The SPS configuration may be indicated in DCI message 405-a. In some cases, the UE 115 may receive an RRC message including the SPS configuration and an indication of a set of aperiodic time-frequency resources. The UE 115 may use the aperiodic time-frequency resources to transmit one or more feedback messages.

In some other examples, as illustrated with reference to FIG. 4B, the base station 105 may configure the uplink resources allocated for the one or more feedback messages 410 according to a dynamic period. For example, the period between feedback messages 410 may be large at first, but may decrease to a smaller period at a later time. The dynamic period configuration may be indicated in DCI message 405-a.

FIG. 5 illustrates an example of a process flow 500 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. In some examples, process flow 500 may implement aspects of wireless communications system 100, wireless communications system 200, timelines 300, timelines 400, or a combination. The process flow 500 may illustrate an example of a base station 105 transmitting control signaling to a UE 115 including a scheduling grant for a downlink message encoded using a rateless coding scheme and an indication of one or more resources to use for feedback for the downlink message. Alternative examples of the following may be implemented, where some processes are performed in a different order than described or are not performed. In some cases, processes may include additional features not mentioned below, or further processes may be added.

At 505 and 510, UE 115-b may receive a control message (e.g., a DCI message) from base station 105-b including first scheduling information for a downlink message encoded using a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message. In some cases, UE 115-b may receive an SPS configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions, where the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback. UE 115-b may activate the SPS configuration for feedback messages based on the control messaging. In some other cases, UE 115-b may receive a dynamic scheduling configuration indicating a set of time-frequency resources with dynamic periods, where the set of time-frequency resources is the set of uplink resources allocated for the feedback. In some examples, UE 115-b may receive an RRC message including an SPS configuration indicting a set of aperiodic time-frequency resources, where the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.

At 515, UE 115-b may monitor for a downlink message based on the first scheduling information (e.g., a scheduling grant) . At 520, UE 115-b may receive a first number of encoded packets of the downlink message based on the first scheduling information. In some cases, the downlink message may include one or more sets of encoded packets, each set including a number of encoded packets.

At 525, UE 115-b may transmit a feedback message to base station 105-b using one or more resources of the set of the uplink resources allocated for the feedback message. The feedback message may indicate feedback information (e.g., an ACK or a NACK) for the downlink message. In some cases, UE 115-b may transmit the feedback message based on receiving the first number of encoded packets at 520. For example, if the first number of encoded packets received by UE 115-b is larger than or equal to the number of encoded packets UE 115-b uses to decode the downlink message, then UE 115-b may transmit an ACK to base station 105-b. Base station 105-b may terminate transmission of encoded packets after receiving the ACK. In some other examples, base station 105-b may transmit one or more additional encoded packets based on receiving the feedback message. For example, if the first number of encoded packets received by UE 115-b for the downlink message is less than the number of encoded packets UE 115-b uses to decode the downlink message, then UE 115-b may transmit a NACK to base station 105-b. Base station 105-b may transmit additional encoded packets based on receiving the NACK. In some examples, the feedback message may include a number of the one or more encoded packets received successfully by UE 115-b, received unsuccessfully by UE 115-b, or both.

At 530, UE 115-b may determine a threshold number of packets for successful decoding of one or more downlink messages. At 535, UE 115-b may refrain from monitoring for one or more encoded packets of the downlink message based on a number of successfully received encoded packets being greater than or equal to the threshold number of packets for the one or more downlink messages. in some other cases, UE 115-b may monitor for one or more encoded packets of the downlink message based on the number of successfully received encoded packets being less than the threshold number of packets for the one or more downlink messages.

At 540, UE 115-b may receive an additional one or more encoded packets after transmitting the feedback message. For example, UE 115-b may receive a second number of encoded packets of the downlink message. In some cases, UE 115-b may receive the second number of encoded packets before receiving a second control message.

At 545, UE 115-b may receive an additional one or more control message. In some cases, each of the additional one or more control messages may schedule a respective downlink message. In some cases, UE 115-b may a second control message (e.g., another DCI message) including second scheduling information for a third number of encoded packets of the original downlink message or another downlink message.

At 550, UE 115-b may monitor for the respective downlink messages based on the additional one or more control messages. For example, UE 115-b may monitor for the third number of encoded packets of the downlink message based on the second scheduling information. At 555, UE 115-b may receive the third number of encoded packets based on the monitoring. In some cases, UE 115-b may transmit feedback information for the downlink message and the respective downlink messages based on receiving the second encoded packets, the third encoded packets, or both.

FIG. 6 shows a block diagram 600 of a device 605 that supports control signaling for rateless codes with feedback in accordance with 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 communications manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to control signaling for rateless codes with feedback, etc. ) . Information may be passed on to other components of the device 605. The receiver 610 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 610 may utilize a single antenna or a set of antennas.

The communications manager 615 may receive, from a base station, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme, monitor for the downlink message based on the scheduling information, and transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based on the monitoring. The communications manager 615 may be an example of aspects of the communications manager 910 described herein.

The actions performed by the communications manager 615 as described herein may be implemented to realize one or more potential advantages. One implementation may enable a base station to transmit control signaling to a UE including a scheduling grant for a downlink message encoding using a rateless coding scheme and a set of uplink resources for feedback for the downlink message. The feedback for the rateless coding scheme downlink message may enable the base station to terminate the downlink message transmission early or transmit additional packets for the downlink message, which may improve communication latency (e.g., related to retransmission of downlink messages or unnecessary transmission of packets related to the downlink messages) , among other advantages.

Based on implementing the feedback as described herein, a processor of a UE or a base station (e.g., a processor controlling the receiver 610, the communications manager 615, the transmitter 620, or a combination thereof) may reduce the impact or likelihood of inefficient communications due to the base station transmitting unnecessary packets of the downlink message or retransmitting a downlink message instead of transmitting additional packets. For example, the UE may leverage the indicated uplink resources to transmit feedback information for downlink messages, which may realize improved resource allocation at the UE, among other benefits.

The communications manager 615, or its sub-components, may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 615, or its sub-components may be executed by a general-purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate-array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

The communications manager 615, or its sub-components, may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components. In some examples, the communications manager 615, or its sub-components, may be a separate and distinct component in accordance with various aspects of the present disclosure. In some examples, the communications manager 615, or its sub-components, may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

The transmitter 620 may transmit signals generated by other components of the device 605. In some examples, the transmitter 620 may be collocated with a receiver 610 in a transceiver module. For example, the transmitter 620 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 620 may utilize a single antenna or a set of antennas.

FIG. 7 shows a block diagram 700 of a device 705 that supports control signaling for rateless codes with feedback in accordance with 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 communications manager 715, and a transmitter 735. The device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to control signaling for rateless codes with feedback, etc. ) . Information may be passed on to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 710 may utilize a single antenna or a set of antennas.

The communications manager 715 may be an example of aspects of the communications manager 615 as described herein. The communications manager 715 may include a control information component 720, a scheduling component 725, and a feedback component 730. The communications manager 715 may be an example of aspects of the communications manager 910 described herein.

The control information component 720 may receive, from a base station, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The scheduling component 725 may monitor for the downlink message based on the scheduling information. The feedback component 730 may transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based on the monitoring.

The transmitter 735 may transmit signals generated by other components of the device 705. In some examples, the transmitter 735 may be collocated with a receiver 710 in a transceiver module. For example, the transmitter 735 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 735 may utilize a single antenna or a set of antennas.

FIG. 8 shows a block diagram 800 of a communications manager 805 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The communications manager 805 may be an example of aspects of a communications manager 615, a communications manager 715, or a communications manager 910 described herein. The communications manager 805 may include a control information component 810, a scheduling component 815, a feedback component 820, and a threshold component 825. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The control information component 810 may receive, from a base station, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The scheduling component 815 may monitor for the downlink message based on the scheduling information. The feedback component 820 may transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based on the monitoring.

In some examples, the scheduling component 815 may receive a first number of encoded packets of the downlink message based on the scheduling information, the downlink message including the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme. In some examples, the feedback component 820 may transmit the feedback message based on receiving the first number of encoded packets, where the feedback message indicates the first number of encoded packets received by the UE. In some examples, the control information component 810 may receive, after transmitting the feedback message, a second control message that schedules the second number of encoded packets of the downlink message. In some examples, the control information component 810 may monitor for the second number of encoded packets based on the second control message.

In some examples, the scheduling component 815 may receive one or more encoded packets of a set of encoded packets based on the scheduling information, the downlink message including the set of encoded packets encoded according to the rateless coding scheme. In some examples, the feedback component 820 may transmit the feedback message based on receiving the one or more encoded packets, where the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both. In some examples, the scheduling component 815 may receive an additional one or more encoded packets of the set of encoded packets after transmitting the feedback message. In some cases, the additional one or more encoded packets may be received before or after reception of a second control message that schedules a second downlink message.

In some examples, the control information component 810 may receive, from the base station, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages. In some examples, the scheduling component 815 may monitor for the respective downlink messages based on the additional one or more control messages, where the feedback message includes the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same set of encoded packets.

In some examples, the scheduling component 815 may receive a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions. In some examples, the scheduling component 815 may activate the semi-persistent scheduling configuration for the feedback based on the control message, where the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.

In some examples, the scheduling component 815 may receive a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, where the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.

In some examples, the scheduling component 815 may receive an RRC message including semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, where the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.

The threshold component 825 may determine a threshold number of packets corresponding to a successful decoding of one or more downlink messages. In some examples, the threshold component 825 may refrain from monitoring for one or more encoded packets of the downlink message based on the feedback information for the downlink message being associated with a number of successfully received encoded packets greater than the threshold number of packets for the one or more downlink messages. In some examples, the threshold component 825 may monitor for one or more encoded packets of the downlink message based on the feedback information for the downlink message being associated with a number of successfully received encoded packets that is less than the threshold number of packets for the one or more downlink messages.

FIG. 9 shows a diagram of a system 900 including a device 905 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The device 905 may be an example of or include the components of device 605, device 705, or a UE 115 as described herein. The device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 910, an I/O controller 915, a transceiver 920, an antenna 925, memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., bus 945) .

The communications manager 910 may receive, from a base station, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme, monitor for the downlink message based on the scheduling information, and transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based on the monitoring.

The I/O controller 915 may manage input and output signals for the device 905. The I/O controller 915 may also manage peripherals not integrated into the device 905. In some cases, the I/O controller 915 may represent a physical connection or port to an external peripheral. In some cases, the I/O controller 915 may utilize an operating system such as

or another known operating system. In other cases, the I/O controller 915 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller 915 may be implemented as part of a processor. In some cases, a user may interact with the device 905 via the I/O controller 915 or via hardware components controlled by the I/O controller 915.

The transceiver 920 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 920 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 920 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

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

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

The processor 940 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a central processing unit (CPU) , a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, a memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting control signaling for rateless codes with feedback) .

The code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 935 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 935 may not be directly executable by the processor 940 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

FIG. 10 shows a block diagram 1000 of a device 1005 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The device 1005 may be an example of aspects of a base station 105 as described herein. The device 1005 may include a receiver 1010, a communications manager 1015, and a transmitter 1020. The device 1005 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to control signaling for rateless codes with feedback, etc. ) . Information may be passed on to other components of the device 1005. The receiver 1010 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13.

The receiver 1010 may utilize a single antenna or a set of antennas.

The communications manager 1015 may transmit, to a UE, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme, transmit, to the UE, the downlink message based on the scheduling information, and receive, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message. The communications manager 1015 may be an example of aspects of the communications manager 1310 described herein.

The communications manager 1015, or its sub-components, may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 1015, or its sub-components may be executed by a general-purpose processor, a DSP, an ASIC, a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

The communications manager 1015, or its sub-components, may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components. In some examples, the communications manager 1015, or its sub-components, may be a separate and distinct component in accordance with various aspects of the present disclosure. In some examples, the communications manager 1015, or its sub-components, may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

The transmitter 1020 may transmit signals generated by other components of the device 1005. In some examples, the transmitter 1020 may be collocated with a receiver 1010 in a transceiver module. For example, the transmitter 1020 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The transmitter 1020 may utilize a single antenna or a set of antennas.

FIG. 11 shows a block diagram 1100 of a device 1105 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The device 1105 may be an example of aspects of a device 1005, or a base station 105 as described herein. The device 1105 may include a receiver 1110, a communications manager 1115, and a transmitter 1135. The device 1105 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to control signaling for rateless codes with feedback, etc. ) . Information may be passed on to other components of the device 1105. The receiver 1110 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The receiver 1110 may utilize a single antenna or a set of antennas.

The communications manager 1115 may be an example of aspects of the communications manager 1015 as described herein. The communications manager 1115 may include a control information component 1120, a scheduling component 1125, and a feedback component 1130. The communications manager 1115 may be an example of aspects of the communications manager 1310 described herein.

The control information component 1120 may transmit, to a UE, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The scheduling component 1125 may transmit, to the UE, the downlink message based on the scheduling information. The feedback component 1130 may receive, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message.

The transmitter 1135 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1135 may be collocated with a receiver 1110 in a transceiver module. For example, the transmitter 1135 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The transmitter 1135 may utilize a single antenna or a set of antennas.

FIG. 12 shows a block diagram 1200 of a communications manager 1205 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The communications manager 1205 may be an example of aspects of a communications manager 1015, a communications manager 1115, or a communications manager 1310 described herein. The communications manager 1205 may include a control information component 1210, a scheduling component 1215, a feedback component 1220, and a threshold component 1225. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The control information component 1210 may transmit, to a UE, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The scheduling component 1215 may transmit, to the UE, the downlink message based on the scheduling information. The feedback component 1220 may receive, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message.

In some examples, the scheduling component 1215 may transmit a first number of encoded packets of the downlink message based on the scheduling information, the downlink message including the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme. In some examples, the feedback component 1220 may receive the feedback message based on transmitting the first number of encoded packets, where the feedback message indicates at least a subset of the first number of encoded packets received by the UE. In some examples, the feedback component 1220 may transmit, after receiving the feedback message, a second control message that schedules the second number of encoded packets of the downlink message based on the feedback message.

In some examples, the scheduling component 1215 may transmit one or more encoded packets of a set of encoded packets of the downlink message based on the scheduling information, the downlink message including the set of encoded packets encoded according to the rateless coding scheme. In some examples, the feedback component 1220 may receive the feedback message based on transmitting the one or more encoded packets, where the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both. In some examples, the scheduling component 1215 may transmit an additional one or more encoded packets of the set of encoded packets after receiving the feedback message. In some cases, the additional one or more encoded packets are transmitting before or after transmission of a second control message that schedules a second downlink message.

In some examples, the control information component 1210 may transmit, to the UE, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages, where the feedback message includes the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same set of encoded packets.

In some examples, the scheduling component 1215 may transmit, to the UE, a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions. In some examples, the scheduling component 1215 may transmit, to the UE, control information to the UE that activates the semi-persistent scheduling configuration for the feedback, where the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.

In some examples, the scheduling component 1215 may transmit, to the UE, a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, where the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.

In some examples, the scheduling component 1215 may transmit, to the UE, an RRC message including semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, where the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.

The threshold component 1225 may determine a threshold number of packets corresponding to a successful decoding of one or more downlink messages. In some examples, the threshold component 1225 may refrain from transmitting one or more encoded packets of the downlink message based on the feedback information for the downlink message being associated with a number of encoded packets greater than the threshold number of packets for the one or more downlink messages.

FIG. 13 shows a diagram of a system 1300 including a device 1305 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The device 1305 may be an example of or include the components of device 1005, device 1105, or a base station 105 as described herein. The device 1305 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 1310, a network communications manager 1315, a transceiver 1320, an antenna 1325, memory 1330, a processor 1340, and an inter-station communications manager 1345. These components may be in electronic communication via one or more buses (e.g., bus 1350) .

The communications manager 1310 may transmit, to a UE, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme, transmit, to the UE, the downlink message based on the scheduling information, and receive, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message.

The network communications manager 1315 may manage communications with the core network (e.g., via one or more wired backhaul links) . For example, the network communications manager 1315 may manage the transfer of data communications for client devices, such as one or more UEs 115.

The transceiver 1320 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 1320 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1320 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1325. However, in some cases the device may have more than one antenna 1325, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 1330 may include RAM, ROM, or a combination thereof. The memory 1330 may store computer-readable code 1335 including instructions that, when executed by a processor (e.g., the processor 1340) cause the device to perform various functions described herein. In some cases, the memory 1330 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor 1340 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some cases, the processor 1340 may be configured to operate a memory array using a memory controller. In some cases, a memory controller may be integrated into processor 1340. The processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1330) to cause the device 1305 to perform various functions (e.g., functions or tasks supporting control signaling for rateless codes with feedback) .

The inter-station communications manager 1345 may manage communications with other base station 105, and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communications manager 1345 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communications manager 1345 may provide an X2 interface within an LTE/LTE-A wireless communication network technology to provide communication between base stations 105.

The code 1335 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1335 may not be directly executable by the processor 1340 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

FIG. 14 shows a flowchart illustrating a method 1400 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The operations of method 1400 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1400 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1405, the UE may receive, from a base station, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by a control information component as described with reference to FIGs. 6 through 9.

At 1410, the UE may monitor for the downlink message based on the scheduling information. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed by a scheduling component as described with reference to FIGs. 6 through 9.

At 1415, the UE may transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based on the monitoring. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed by a feedback component as described with reference to FIGs. 6 through 9.

FIG. 15 shows a flowchart illustrating a method 1500 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The operations of method 1500 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1500 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1505, the UE may receive, from a base station, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by a control information component as described with reference to FIGs. 6 through 9.

At 1510, the UE may monitor for the downlink message based on the scheduling information. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by a scheduling component as described with reference to FIGs. 6 through 9.

At 1515, the UE may receive one or more encoded packets of a set of encoded packets based on the scheduling information, the downlink message including the set of encoded packets encoded according to the rateless coding scheme. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed by a scheduling component as described with reference to FIGs. 6 through 9.

At 1520, the UE may transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based on the monitoring. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed by a feedback component as described with reference to FIGs. 6 through 9.

At 1525, the UE may transmit the feedback message based on receiving the one or more encoded packets, where the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed by a feedback component as described with reference to FIGs. 6 through 9.

FIG. 16 shows a flowchart illustrating a method 1600 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The operations of method 1600 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1600 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1605, the UE may receive, from a base station, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed by a control information component as described with reference to FIGs. 6 through 9.

At 1610, the UE may receive, from the base station, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by a control information component as described with reference to FIGs. 6 through 9.

At 1615, the UE may monitor for the downlink message based on the scheduling information. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed by a scheduling component as described with reference to FIGs. 6 through 9.

At 1620, the UE may monitor for the respective downlink messages based on the additional one or more control messages. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed by a scheduling component as described with reference to FIGs. 6 through 9.

At 1625, the UE may transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based on the monitoring, where the feedback message includes the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same set of encoded packets. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed by a feedback component as described with reference to FIGs. 6 through 9.

FIG. 17 shows a flowchart illustrating a method 1700 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The operations of method 1700 may be implemented by a base station 105 or its components as described herein. For example, the operations of method 1700 may be performed by a communications manager as described with reference to FIGs. 10 through 13. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.

At 1705, the base station may transmit, to a UE, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by a control information component as described with reference to FIGs. 10 through 13.

At 1710, the base station may transmit, to the UE, the downlink message based on the scheduling information. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by a scheduling component as described with reference to FIGs. 10 through 13.

At 1715, the base station may receive, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed by a feedback component as described with reference to FIGs. 10 through 13.

FIG. 18 shows a flowchart illustrating a method 1800 that supports control signaling for rateless codes with feedback in accordance with aspects of the present disclosure. The operations of method 1800 may be implemented by a base station 105 or its components as described herein. For example, the operations of method 1800 may be performed by a communications manager as described with reference to FIGs. 10 through 13. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.

At 1805, the base station may transmit, to a UE, a control message including scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed by a control information component as described with reference to FIGs. 10 through 13.

At 1810, the base station may transmit, to the UE, the downlink message based on the scheduling information. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed by a scheduling component as described with reference to FIGs. 10 through 13.

At 1815, the base station may transmit a first number of encoded packets of the downlink message based on the scheduling information, the downlink message including the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed by a scheduling component as described with reference to FIGs. 10 through 13.

At 1820, the base station may receive, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed by a feedback component as described with reference to FIGs. 10 through 13.

At 1825, the base station may receive the feedback message based on transmitting the first number of encoded packets, where the feedback message indicates at least a subset of the first number of encoded packets received by the UE. The operations of 1825 may be performed according to the methods described herein. In some examples, aspects of the operations of 1825 may be performed by a feedback component as described with reference to FIGs. 10 through 13.

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

Example 1: A method for wireless communications at a user equipment (UE) , comprising: receiving, from a base station, a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme; monitoring for the downlink message based at least in part on the scheduling information; and transmitting, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based at least in part on the monitoring.

Example 2: The method of example 1, further comprising: receiving a first number of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme; and transmitting the feedback message based at least in part on receiving the first number of encoded packets, wherein the feedback message indicates the first number of encoded packets received by the UE.

Example 3: The method of example 1 or 2, further comprising: receiving, after transmitting the feedback message, a second control message that schedules the second number of encoded packets of the downlink message; and monitoring for the second number of encoded packets based at least in part on the second control message.

Example 4: The method of any of examples 1 to 3, further comprising: receiving one or more encoded packets of a plurality of encoded packets based at least in part on the scheduling information, the downlink message comprising the plurality of encoded packets encoded according to the rateless coding scheme; and transmitting the feedback message based at least in part on receiving the one or more encoded packets, wherein the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both.

Example 5: The method of any of examples 1 to 4, further comprising: receiving an additional one or more encoded packets of the plurality of encoded packets after transmitting the feedback message.

Example 6: The method of any of examples 1 to 5, wherein the additional one or more encoded packets are received before reception of a second control message that schedules a second downlink message.

Example 7: The method of any of examples 1 to 5, wherein the additional one or more encoded packets are received after reception of a second control message that schedules a second downlink message.

Example 8: The method of any of examples 1 to 7, further comprising: receiving, from the base station, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages; and monitoring for the respective downlink messages based at least in part on the additional one or more control messages, wherein the feedback message comprises the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same plurality of encoded packets.

Example 9: The method of any of examples 1 to 8, further comprising: receiving a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions; and activating the semi-persistent scheduling configuration for the feedback based at least in part on the control message, wherein the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.

Example 10: The method of any of examples 1 to 8, further comprising: receiving a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, wherein the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.

Example 11: The method of any of examples 1 to 10, further comprising: receiving a radio resource control message comprising semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, wherein the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.

Example 12: The method of any of examples 1 to 11, further comprising: determining a threshold number of packets corresponding to a successful decoding of one or more downlink messages.

Example 13: The method of any of examples 1 to 12, further comprising: refraining from monitoring for one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of successfully received encoded packets greater than the threshold number of packets for the one or more downlink messages.

Example 14: The method of any of examples 1 to 12, further comprising: monitoring for one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of successfully received encoded packets that is less than the threshold number of packets for the one or more downlink messages.

Example 15: A method for wireless communications at a base station, comprising: transmitting, to a user equipment (UE) , a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme; transmitting, to the UE, the downlink message based at least in part on the scheduling information; and receiving, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message.

Example 16: The method of example 15, further comprising: transmitting a first number of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme; and receiving the feedback message based at least in part on transmitting the first number of encoded packets, wherein the feedback message indicates at least a subset of the first number of encoded packets received by the UE.

Example 17: The method of example 15 or 16, further comprising: transmitting, after receiving the feedback message, a second control message that schedules the second number of encoded packets of the downlink message based at least in part on the feedback message.

Example 18: The method of any of examples 15 to 17, further comprising: transmitting one or more encoded packets of a plurality of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the plurality of encoded packets encoded according to the rateless coding scheme; and receiving the feedback message based at least in part on transmitting the one or more encoded packets, wherein the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both.

Example 19: The method of any of examples 15 to 18, further comprising: transmitting an additional one or more encoded packets of the plurality of encoded packets after receiving the feedback message.

Example 20: The method of any of examples 15 to 19, wherein the additional one or more encoded packets are transmitting before transmission of a second control message that schedules a second downlink message.

Example 21: The method of any of examples 15 to 19, wherein the additional one or more encoded packets are transmitting after transmission of a second control message that schedules a second downlink message.

Example 22: The method of any of examples 15 to 21, further comprising: transmitting, to the UE, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages, wherein the feedback message comprises the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same plurality of encoded packets.

Example 23: The method of any of examples 15 to 22, further comprising: transmitting, to the UE, a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions; and transmitting, to the UE, control information to the UE that activates the semi-persistent scheduling configuration for the feedback, wherein the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.

Example 24: The method of any of examples 15 to 22, further comprising: transmitting, to the UE, a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, wherein the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.

Example 25: The method of any of examples 15 to 24, further comprising: transmitting, to the UE, a radio resource control message comprising semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, wherein the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.

Example 26: The method of any of examples 15 to 25, further comprising: determining a threshold number of packets corresponding to a successful decoding of one or more downlink messages; and refraining from transmitting one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of encoded packets greater than the threshold number of packets for the one or more downlink messages.

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.

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.

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

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on 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.

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 place 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 where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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. ”

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.

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 instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

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

A method for wireless communications at a user equipment (UE) , comprising:

receiving, from a base station, a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme;

monitoring for the downlink message based at least in part on the scheduling information; and

transmitting, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based at least in part on the monitoring.
The method of claim 1, further comprising:

receiving a first number of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme; and

transmitting the feedback message based at least in part on receiving the first number of encoded packets, wherein the feedback message indicates the first number of encoded packets received by the UE.
The method of claim 2, further comprising:

receiving, after transmitting the feedback message, a second control message that schedules the second number of encoded packets of the downlink message; and

monitoring for the second number of encoded packets based at least in part on the second control message.
The method of claim 1, further comprising:

receiving one or more encoded packets of a plurality of encoded packets based at least in part on the scheduling information, the downlink message comprising the plurality of encoded packets encoded according to the rateless coding scheme; and

transmitting the feedback message based at least in part on receiving the one or more encoded packets, wherein the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both.
The method of claim 4, further comprising:

receiving an additional one or more encoded packets of the plurality of encoded packets after transmitting the feedback message.
The method of claim 5, wherein the additional one or more encoded packets are received before reception of a second control message that schedules a second downlink message.
The method of claim 5, wherein the additional one or more encoded packets are received after reception of a second control message that schedules a second downlink message.
The method of claim 1, further comprising:

receiving, from the base station, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages; and

monitoring for the respective downlink messages based at least in part on the additional one or more control messages, wherein the feedback message comprises the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same plurality of encoded packets.
The method of claim 1, further comprising:

receiving a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions; and

activating the semi-persistent scheduling configuration for the feedback based at least in part on the control message, wherein the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.
The method of claim 1, further comprising:

receiving a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, wherein the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.
The method of claim 1, further comprising:

receiving a radio resource control message comprising semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, wherein the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.
The method of claim 1, further comprising:

determining a threshold number of packets corresponding to a successful decoding of one or more downlink messages.
The method of claim 12, further comprising:

refraining from monitoring for one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of successfully received encoded packets greater than the threshold number of packets for the one or more downlink messages.
The method of claim 12, further comprising:

monitoring for one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of successfully received encoded packets that is less than the threshold number of packets for the one or more downlink messages.
A method for wireless communications at a base station, comprising:

transmitting, to a user equipment (UE) , a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme;

transmitting, to the UE, the downlink message based at least in part on the scheduling information; and

receiving, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message.
The method of claim 15, further comprising:

transmitting a first number of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme; and

receiving the feedback message based at least in part on transmitting the first number of encoded packets, wherein the feedback message indicates at least a subset of the first number of encoded packets received by the UE.
The method of claim 16, further comprising:

transmitting, after receiving the feedback message, a second control message that schedules the second number of encoded packets of the downlink message based at least in part on the feedback message.
The method of claim 15, further comprising:

transmitting one or more encoded packets of a plurality of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the plurality of encoded packets encoded according to the rateless coding scheme; and

receiving the feedback message based at least in part on transmitting the one or more encoded packets, wherein the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both.
The method of claim 18, further comprising:

transmitting an additional one or more encoded packets of the plurality of encoded packets after receiving the feedback message.
The method of claim 19, wherein the additional one or more encoded packets are transmitting before transmission of a second control message that schedules a second downlink message.
The method of claim 19, wherein the additional one or more encoded packets are transmitting after transmission of a second control message that schedules a second downlink message.
The method of claim 15, further comprising:

transmitting, to the UE, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages, wherein the feedback message comprises the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same plurality of encoded packets.
The method of claim 15, further comprising:

transmitting, to the UE, a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions; and

transmitting, to the UE, control information to the UE that activates the semi-persistent scheduling configuration for the feedback, wherein the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.
The method of claim 15, further comprising:

transmitting, to the UE, a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, wherein the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.
The method of claim 15, further comprising:

transmitting, to the UE, a radio resource control message comprising semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, wherein the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.
The method of claim 15, further comprising:

determining a threshold number of packets corresponding to a successful decoding of one or more downlink messages; and

refraining from transmitting one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of encoded packets greater than the threshold number of packets for the one or more downlink messages.
An apparatus for wireless communications at a user equipment (UE) , comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

receive, from a base station, a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme;

monitor for the downlink message based at least in part on the scheduling information; and

transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based at least in part on the monitoring.
The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to:

receive a first number of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme; and

transmit the feedback message based at least in part on receiving the first number of encoded packets, wherein the feedback message indicates the first number of encoded packets received by the UE.
The apparatus of claim 28, wherein the instructions are further executable by the processor to cause the apparatus to:

receive, after transmitting the feedback message, a second control message that schedules the second number of encoded packets of the downlink message; and

monitor for the second number of encoded packets based at least in part on the second control message.
The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to:

receive one or more encoded packets of a plurality of encoded packets based at least in part on the scheduling information, the downlink message comprising the plurality of encoded packets encoded according to the rateless coding scheme; and

transmit the feedback message based at least in part on receiving the one or more encoded packets, wherein the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both.
The apparatus of claim 30, wherein the instructions are further executable by the processor to cause the apparatus to:

receive an additional one or more encoded packets of the plurality of encoded packets after transmitting the feedback message.
The apparatus of claim 31, wherein the additional one or more encoded packets are received before reception of a second control message that schedules a second downlink message.
The apparatus of claim 31, wherein the additional one or more encoded packets are received after reception of a second control message that schedules a second downlink message.
The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to:

receive, from the base station, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages; and

monitor for the respective downlink messages based at least in part on the additional one or more control messages, wherein the feedback message comprises the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same plurality of encoded packets.
The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to:

receive a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions; and

activate the semi-persistent scheduling configuration for the feedback based at least in part on the control message, wherein the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.
The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to:

receive a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, wherein the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.
The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to:

receive a radio resource control message comprising semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, wherein the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.
The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to:

determine a threshold number of packets corresponding to a successful decoding of one or more downlink messages.
The apparatus of claim 38, wherein the instructions are further executable by the processor to cause the apparatus to:

refrain from monitoring for one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of successfully received encoded packets greater than the threshold number of packets for the one or more downlink messages.
The apparatus of claim 38, wherein the instructions are further executable by the processor to cause the apparatus to:

monitor for one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of successfully received encoded packets that is less than the threshold number of packets for the one or more downlink messages.
An apparatus for wireless communications at a base station, comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

transmit, to a user equipment (UE) , a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme;

transmit, to the UE, the downlink message based at least in part on the scheduling information; and

receive, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message.
The apparatus of claim 41, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit a first number of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme; and

receive the feedback message based at least in part on transmitting the first number of encoded packets, wherein the feedback message indicates at least a subset of the first number of encoded packets received by the UE.
The apparatus of claim 42, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit, after receiving the feedback message, a second control message that schedules the second number of encoded packets of the downlink message based at least in part on the feedback message.
The apparatus of claim 41, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit one or more encoded packets of a plurality of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the plurality of encoded packets encoded according to the rateless coding scheme; and

receive the feedback message based at least in part on transmitting the one or more encoded packets, wherein the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both.
The apparatus of claim 44, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit an additional one or more encoded packets of the plurality of encoded packets after receiving the feedback message.
The apparatus of claim 45, wherein the additional one or more encoded packets are transmitting before transmission of a second control message that schedules a second downlink message.
The apparatus of claim 45, wherein the additional one or more encoded packets are transmitting after transmission of a second control message that schedules a second downlink message.
The apparatus of claim 41, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit, to the UE, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages, wherein the feedback message comprises the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same plurality of encoded packets.
The apparatus of claim 41, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit, to the UE, a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions; and

transmit, to the UE, control information to the UE that activates the semi-persistent scheduling configuration for the feedback, wherein the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.
The apparatus of claim 41, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit, to the UE, a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, wherein the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.
The apparatus of claim 41, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit, to the UE, a radio resource control message comprising semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, wherein the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.
The apparatus of claim 41, wherein the instructions are further executable by the processor to cause the apparatus to:

determine a threshold number of packets corresponding to a successful decoding of one or more downlink messages; and

refrain from transmitting one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of encoded packets greater than the threshold number of packets for the one or more downlink messages.
An apparatus for wireless communications at a user equipment (UE) , comprising:

means for receiving, from a base station, a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme;

means for monitoring for the downlink message based at least in part on the scheduling information; and

means for transmitting, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based at least in part on the monitoring.
The apparatus of claim 53, further comprising:

means for receiving a first number of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme; and

means for transmitting the feedback message based at least in part on receiving the first number of encoded packets, wherein the feedback message indicates the first number of encoded packets received by the UE.
The apparatus of claim 54, further comprising:

means for receiving, after transmitting the feedback message, a second control message that schedules the second number of encoded packets of the downlink message; and

means for monitoring for the second number of encoded packets based at least in part on the second control message.
The apparatus of claim 53, further comprising:

means for receiving one or more encoded packets of a plurality of encoded packets based at least in part on the scheduling information, the downlink message comprising the plurality of encoded packets encoded according to the rateless coding scheme; and

means for transmitting the feedback message based at least in part on receiving the one or more encoded packets, wherein the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both.
The apparatus of claim 56, further comprising:

means for receiving an additional one or more encoded packets of the plurality of encoded packets after transmitting the feedback message.
The apparatus of claim 57, wherein the additional one or more encoded packets are received before reception of a second control message that schedules a second downlink message.
The apparatus of claim 57, wherein the additional one or more encoded packets are received after reception of a second control message that schedules a second downlink message.
The apparatus of claim 53, further comprising:

means for receiving, from the base station, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages; and

means for monitoring for the respective downlink messages based at least in part on the additional one or more control messages, wherein the feedback message comprises the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same plurality of encoded packets.
The apparatus of claim 53, further comprising:

means for receiving a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions; and

means for activating the semi-persistent scheduling configuration for the feedback based at least in part on the control message, wherein the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.
The apparatus of claim 53, further comprising:

means for receiving a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, wherein the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.
The apparatus of claim 53, further comprising:

means for receiving a radio resource control message comprising semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, wherein the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.
The apparatus of claim 53, further comprising:

means for determining a threshold number of packets corresponding to a successful decoding of one or more downlink messages.
The apparatus of claim 64, further comprising:

means for refraining from monitoring for one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of successfully received encoded packets greater than the threshold number of packets for the one or more downlink messages.
The apparatus of claim 64, further comprising:

means for monitoring for one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of successfully received encoded packets that is less than the threshold number of packets for the one or more downlink messages.
An apparatus for wireless communications at a base station, comprising:

means for transmitting, to a user equipment (UE) , a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme;

means for transmitting, to the UE, the downlink message based at least in part on the scheduling information; and

means for receiving, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message.
The apparatus of claim 67, further comprising:

means for transmitting a first number of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the first number of encoded packets and a second number of encoded packets both encoded according to the rateless coding scheme; and

means for receiving the feedback message based at least in part on transmitting the first number of encoded packets, wherein the feedback message indicates at least a subset of the first number of encoded packets received by the UE.
The apparatus of claim 68, further comprising:

means for transmitting, after receiving the feedback message, a second control message that schedules the second number of encoded packets of the downlink message based at least in part on the feedback message.
The apparatus of claim 67, further comprising:

means for transmitting one or more encoded packets of a plurality of encoded packets of the downlink message based at least in part on the scheduling information, the downlink message comprising the plurality of encoded packets encoded according to the rateless coding scheme; and

means for receiving the feedback message based at least in part on transmitting the one or more encoded packets, wherein the feedback message indicates a number of the one or more encoded packets received successfully by the UE, received unsuccessfully by the UE, or both.
The apparatus of claim 70, further comprising:

means for transmitting an additional one or more encoded packets of the plurality of encoded packets after receiving the feedback message.
The apparatus of claim 71, wherein the additional one or more encoded packets are transmitting before transmission of a second control message that schedules a second downlink message.
The apparatus of claim 71, wherein the additional one or more encoded packets are transmitting after transmission of a second control message that schedules a second downlink message.
The apparatus of claim 67, further comprising:

means for transmitting, to the UE, an additional one or more control messages, each of the additional one or more control messages scheduling respective downlink messages, wherein the feedback message comprises the feedback information for the downlink message and the respective downlink messages, the downlink message and the respective downlink messages corresponding to a same plurality of encoded packets.
The apparatus of claim 67, further comprising:

means for transmitting, to the UE, a semi-persistent scheduling configuration that indicates a set of periodic time-frequency resources allocated for semi-persistent transmissions; and

means for transmitting, to the UE, control information to the UE that activates the semi-persistent scheduling configuration for the feedback, wherein the set of periodic time-frequency resources allocated for semi-persistent transmissions is the set of uplink resources allocated for the feedback.
The apparatus of claim 67, further comprising:

means for transmitting, to the UE, a dynamic scheduling configuration indicating a set of time-frequency resources associated with dynamic periods, wherein the set of time-frequency resources associated with the dynamic periods is the set of uplink resources allocated for the feedback.
The apparatus of claim 67, further comprising:

means for transmitting, to the UE, a radio resource control message comprising semi-persistent scheduling configuration indicating a set of aperiodic time-frequency resources, wherein the set of aperiodic time-frequency resources is the set of uplink resources allocated for the feedback.
The apparatus of claim 67, further comprising:

means for determining a threshold number of packets corresponding to a successful decoding of one or more downlink messages; and

means for refraining from transmitting one or more encoded packets of the downlink message based at least in part on the feedback information for the downlink message being associated with a number of encoded packets greater than the threshold number of packets for the one or more downlink messages.
A non-transitory computer-readable medium storing code for wireless communications at a user equipment (UE) , the code comprising instructions executable by a processor to:

receive, from a base station, a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme;

monitor for the downlink message based at least in part on the scheduling information; and

transmit, to the base station and using the set of uplink resources, a feedback message that indicates feedback information for the downlink message based at least in part on the monitoring.
A non-transitory computer-readable medium storing code for wireless communications at a base station, the code comprising instructions executable by a processor to:

transmit, to a user equipment (UE) , a control message comprising scheduling information for a downlink message associated with a rateless coding scheme and an indication of a set of uplink resources allocated for feedback for the downlink message associated with the rateless coding scheme;

transmit, to the UE, the downlink message based at least in part on the scheduling information; and

receive, from the UE and during the set of uplink resources, a feedback message that indicates feedback information for the downlink message.