Broadcasting packets using network coding with feedback

Abstract

The present disclosure describes methods, systems, and devices for wireless communications. A network node may identify (e.g., from a packet pool) a set of packets scheduled for broadcast to a plurality of user equipments (UEs), and send a set of network-coded packets based on the set of packets. The network node may receive feedback from one or more of the plurality of UEs, and the feedback may indicate packets that were successfully decoded by each of the one or more UEs. Based on the feedback, the network node may identify an updated set of packets, and send the updated set. A transmitter may continue to update and send based on the feedback until the feedback indicates that the updated set of packets is empty.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of U.S. Provisional Patent Application No. 63 / 036,853, filed on June 9, 2020, by Zhou et al., entitled “Using Network Coding Broadcast Packets with Feedback”; and the benefit of U.S. Provisional Patent Application No. 63 / 036,860, filed on June 9, 2020, by Zhou et al., entitled “Using Network Coding Broadcast Packets with Feedback”; and the benefit of U.S. Patent Application No. 17 / 315,696, filed on May 10, 2021, by Zhou et al., entitled “Using Network Coding Broadcast Packets with Feedback”; each of which is assigned to the assignee of this agreement. Technical Field

[0003] The following relates generally to wireless communications and, more particularly, to broadcasting packets using network coding with feedback. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messages, broadcasts, etc. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems that may be referred to as new air interface (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or node simultaneously supporting communication of multiple communication devices, which may also be referred to as user equipment (UE).

[0005] The wireless communication system may support broadcasting packets to multiple UEs. A transmitter (e.g., a network node, a base station, etc.) may broadcast multiple packets to multiple receivers (e.g., UEs). The broadcast may be repeated blindly without the transmitter being aware of packets that have been decoded by the receivers. Summary of the invention

[0006] The described technology relates to improved methods, systems, devices and equipment for supporting broadcasting packets using network coding with feedback. In general, the described technology uses a feedback-based design to provide broadcasting of network-coded packets. A network node may identify a set of packets scheduled for broadcasting to a plurality of user equipments (UEs) (e.g., from a packet pool), and send a set of network-coded packets based on the set of packets. The network node may receive feedback from one or more of the plurality of UEs, and the feedback may indicate packets successfully decoded by each of the one or more UEs. Based on the feedback, the network node may identify a set of updated packets excluding the successfully decoded packets included in each subset, and send the updated set. The transmitter may continue to update and send based on the feedback until the feedback indicates that the set of updated packets is empty. In some examples, the network node may identify a set of updated packets excluding any successfully decoded packets included in any subset, and send the updated set. In some cases, the network node may then send a first set of updates excluding the successfully decoded packets included in each subset, and send the updated first set.

[0007] A method for wireless communication at a network node is described. The method may include: identifying, at the network node, a set of packets for broadcasting to a set of UEs, sending a set of network coded packets to the set of UEs based on the set of packets, receiving feedback from each of one or more UEs in the set of UEs, the feedback indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets, determining, based on the feedback, an updated set of packets excluding the successfully decoded packets included in each subset, sending an updated set of network coded packets to the set of UEs based on the updated set of packets, and continuing to update and send the updated set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the updated set of packets is empty.

[0008] An apparatus for wireless communication at a network node is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to identify, at the network node, a set of packets for broadcasting to a set of UEs, send a set of network-coded packets to the set of UEs based on the set of packets, receive feedback from each of one or more UEs in the set of UEs, the feedback indicating successfully decoded packets in the set of packets at each of the one or more UEs as a corresponding subset of the set of packets, determine an updated set of packets excluding the successfully decoded packets included in each subset based on the feedback, send an updated set of network-coded packets to the set of UEs based on the updated set of packets, and continue to update and send the updated set of network-coded packets based on additional feedback received from one or more UEs in the set of UEs until the updated set of packets is empty.

[0009] Another apparatus for wireless communication at a network node is described. The apparatus may include means for identifying, at the network node, a set of packets for broadcasting to a set of UEs, sending a set of network coded packets to the set of UEs based on the set of packets, receiving feedback from each of one or more UEs in the set of UEs indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets, determining an updated set of packets excluding the successfully decoded packets included in each subset based on the feedback, sending an updated set of network coded packets to the set of UEs based on the updated set of packets, and continuing to update and send the updated set of network coded packets until the updated set of packets is empty based on additional feedback received from one or more UEs in the set of UEs.

[0010] A non-transitory computer-readable medium storing code for wireless communication at a network node is described. The code may include instructions executable by a processor to identify, at the network node, a set of packets for broadcasting to a set of UEs, send a set of network coded packets to the set of UEs based on the set of packets, receive feedback from each of one or more UEs in the set of UEs indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets, determine an updated set of packets excluding the successfully decoded packets included in each subset based on the feedback, send an updated set of network coded packets to the set of UEs based on the updated set of packets, and continue updating and sending the updated set of network coded packets until the updated set of packets is empty based on additional feedback received from one or more of the set of UEs.

[0011] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, determining an updated set of packets may include operations, features, means, or instructions for determining an intersection of each subset to identify successfully decoded packets included in each subset.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving feedback may include operations, features, means, or instructions for receiving feedback via a packet data convergence protocol (PDCP) status report, a radio link control (RLC) status report, or a hybrid automatic repeat request (HARQ) message.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving feedback may include operations, features, means, or instructions for receiving feedback or additional feedback in a network coding sublayer, wherein the feedback indicates a decoding status of each packet in a set of packets.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for receiving a channel state information message in conjunction with feedback or additional feedback, and determining one or more coding metrics for a set of packets for transmitting updates based on the channel state information message.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining one or more coding metrics may include operations, features, means, or instructions for determining a modulation and coding scheme, a coding rate, or a combination thereof.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving a channel state information message may include operations, features, means, or instructions for receiving a channel state information message based on feedback indicating a negative acknowledgement of one or more packets in a set of packets.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for sending an indication of one or more network coding parameters to one or more UEs in a set of UEs, wherein a set of at least updated network coded packets may be sent to the set of UEs based on the one or more network coding parameters.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of one or more network coding parameters may include operations, features, means, or instructions for sending an indication of a network coding algorithm, a network coding function, a network coding matrix, a number of decoding iterations, or a combination thereof.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of one or more network coding parameters may include operations, features, means, or instructions for sending one or more network coding parameters using medium access control-control element (MAC-CE) signaling or downlink control information signaling.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of one or more network coding parameters may include operations, features, means, or instructions for sending the one or more network coding parameters using radio resource control signaling.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of one or more network coding parameters may include operations, features, means, or instructions for sending an update to the one or more network coding parameters using radio resource control signaling.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of one or more network coding parameters may include operations, features, means, or instructions for sending an indication of switching from one or more previous network coding parameters to one or more network coding parameters.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for receiving a request for one or more network coding parameters from one or more UEs in a set of UEs, wherein an indication of the one or more network coding parameters may be sent based on receiving the request.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the request may include operations, features, means, or instructions for receiving the request using medium access control-control element (MAC-CE) signaling or uplink control information signaling.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying a set of packets may include operations, features, means, or instructions for identifying a set of packets from a pool of packets scheduled for broadcast to a set of UEs.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for identifying one or more additional packets for broadcasting to the set of UEs based on the one or more additional packets being added to the pool of packets.

[0027] Some examples of the methods, equipment, and non-transitory computer-readable media described herein may also include operations, features, devices, or instructions for encoding a set of packets using a coding function for transmission to a set of UEs, and encoding an updated set of packets using a coding function for transmission to a set of UEs.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the encoding function includes a matrix, and each row of the matrix indicates a combination of the groups.

[0029] A method of wireless communication is described. The method may include identifying, at a network node, a set of packets for broadcasting to a set of UEs, sending a set of network coded packets to the set of UEs based on the set of packets, receiving feedback from each of one or more UEs in the set of UEs indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets, determining a second set of packets based on the feedback, the second set of packets being a set of packets excluding any successfully decoded packets included in any subset, sending a second set of network coded packets to the set of UEs based on the second set of packets, and continuing to update the determined and sent second set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the second set of packets is empty.

[0030] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to identify, at a network node, a set of packets for broadcasting to a set of UEs, send a set of network-coded packets to the set of UEs based on the set of packets, receive feedback from each of one or more UEs in the set of UEs, the feedback indicating successfully decoded packets in the set of packets at each of the one or more UEs as a corresponding subset of the set of packets, determine a second set of packets based on the feedback, the second set of packets being a set of packets excluding any successfully decoded packets included in any subset, send a second set of network-coded packets to the set of UEs based on the second set of packets, and continue to update the determination and send the second set of network-coded packets based on additional feedback received from one or more UEs in the set of UEs until the second set of packets is empty.

[0031] Another apparatus for wireless communication is described. The apparatus may include means for identifying, at a network node, a set of packets for broadcasting to a set of UEs, sending a set of network coded packets to the set of UEs based on the set of packets, receiving feedback from each of one or more UEs in the set of UEs indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets, determining a second set of packets based on the feedback, the second set of packets being a set of packets excluding any successfully decoded packets included in any subset, sending a second set of network coded packets to the set of UEs based on the second set of packets, and continuing to update the determination and sending the second set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the second set of packets is empty.

[0032] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to identify, at a network node, a set of packets for broadcasting to a set of UEs, send a set of network-coded packets to the set of UEs based on the set of packets, receive feedback from each of one or more UEs in the set of UEs indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets, determine a second set of packets based on the feedback, the second set of packets being a set of packets excluding any successfully decoded packets included in any subset, send a second set of network-coded packets to the set of UEs based on the second set of packets, and continue to update the determination and send the second set of network-coded packets based on additional feedback received from one or more UEs in the set of UEs until the second set of packets is empty.

[0033] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for determining an updated set of packets based on the feedback and additional feedback, and sending the updated set of packets to the set of UEs, the updated set of packets excluding successfully decoded packets included in each subset. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1

[0013] An example of a system supporting wireless communications for broadcasting packets using network coding with feedback in accordance with aspects of the present disclosure is shown.

[0035] Figure 2

[0013] An example of a wireless communication system supporting broadcasting of packets using network coding with feedback in accordance with aspects of the present disclosure is shown.

[0036] Figure 3An example of a process flow diagram is shown to support broadcasting packets using network coding with feedback in accordance with aspects of the present disclosure.

[0037] Figure 4 An example of a process flow diagram is shown to support broadcasting packets using network coding with feedback in accordance with aspects of the present disclosure.

[0038] Figure 5 An example of a process flow diagram is shown to support broadcasting packets using network coding with feedback in accordance with aspects of the present disclosure.

[0039] Figure 6 and Figure 7 A block diagram of an apparatus supporting broadcasting of packets using network coding with feedback is shown in accordance with aspects of the present disclosure.

[0040] Figure 8 A block diagram of a communication manager supporting broadcasting of packets using network coding with feedback is shown in accordance with aspects of the present disclosure.

[0041] Fig. 9 A schematic diagram of a system including devices supporting broadcasting packets using network coding with feedback is shown in accordance with aspects of the present disclosure.

[0042] Figures 10 to 13 A flow chart illustrating a method of supporting broadcasting packets using network coding with feedback in accordance with aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0043] A wireless communication system may support broadcasting network-coded packets to multiple user equipments (UEs). A transmitter (e.g., a network node, a base station, etc.) may broadcast multiple packets to multiple receivers (e.g., UEs). The broadcast may be repeated blindly without the transmitter knowing the network-coded packets that have been decoded by the receiver. That is, if the broadcast system does not utilize feedback associated with the packets, the transmitter may continue to send packets blindly without any indication that the packets have actually been decoded by the UE. Therefore, the transmitter may rebroadcast the packets in a wasteful manner because some packets may have been decoded by all UEs. Therefore, lack of feedback may result in waste, unnecessary duplication of packets, and inefficiency.

[0044] The technology described herein utilizes feedback on broadcast packets to determine which packets in a set are to be retransmitted. A transmitter may identify a set of packets for broadcasting to multiple UEs, send a set of network-coded packets based on the set of packets, and use feedback associated with the sent packets to identify an updated set to be sent. The feedback may indicate packets that each corresponding UE can successfully decode. In one design, the transmitter may update the set of packets by subtracting the commonly decoded packets (e.g., the intersection of subsets) from the set of packets. In another design, the transmitter may update the set of packets by subtracting any successfully decoded packets (e.g., the union of subsets) included in any subset indicated by the UE in the feedback. The updated set of packets is then broadcast to the UEs. The updating and sending are performed until the feedback indicates that all UEs have decoded all packets. In some cases, the updating and sending are performed until the feedback indicates that the updated set is empty. The transmitter may then send an updated set excluding the successfully decoded packets included in each subset (e.g., the intersection) and from the original set, and send the updated set.

[0045] Feedback may be received via one or more hybrid automatic repeat request (HARQ) messages using a packet data convergence protocol (PDCP) status report or a radio link control (RLC) status report. In addition, the transmitter may configure network coding parameters for the UE, such as a network coding algorithm, a network coding function, a network coding matrix, a number of decoding iterations, or a combination thereof. Thus, the transmitter and the UE may be synchronized so that the transmitter may encode the packet and the UE may decode the packet. In some examples, the transmitter may adjust a coding metric, such as a modulation and coding scheme (MCS) or a coding rate, based on the feedback so that the UE may have a higher probability of successfully decoding the packet. These and other implementations are further described with reference to the accompanying drawings.

[0046] Certain aspects of the subject matter described herein can be implemented to achieve one or more advantages. Among other advantages, the described techniques can support improvements in packet broadcast frameworks, reduce signaling overhead, and improve reliability. Thus, the supported techniques can include improved network operations, and in some examples, can improve network efficiency and other benefits.

[0047] Various aspects of the present disclosure are initially described in the context of wireless communication systems. Various aspects of the present disclosure are further described with reference to wireless communication systems and process flow diagrams. Various aspects of the present disclosure are further illustrated and described with reference to equipment diagrams, system diagrams, and flow diagrams related to broadcasting packets using network coding with feedback.

[0048] Figure 1An example of a wireless communication system 100 supporting broadcasting packets using network coding with feedback in accordance with various aspects of the present disclosure is shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0049] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may be devices of different forms or capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0050] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, mobile, or both at different times. The UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein can communicate with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0051] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or both, via the backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, the backhaul links 120 may be or include one or more wireless links.

[0052] One or more base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology.

[0053] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device or a subscriber device, or some other suitable terminology, where a "device" may also be referred to as a unit, a station, a terminal or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0054] The UE 115 described herein is capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 shown.

[0055] The UE 115 and the base station 105 can communicate with each other wirelessly via one or more communication links 125 through one or more carriers. The term "carrier" can refer to a collection of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, the carrier used for the communication link 125 may include a portion (e.g., bandwidth portion (BWP)) of a radio frequency spectrum band operated according to one or more physical layer channels of a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel can carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 can use carrier aggregation or multi-carrier operation to support communication with the UE 115. According to the carrier aggregation configuration, the UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0056] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be located based on a channel raster for discovery by a UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by a UE 115 via a carrier, or a carrier may operate in a non-standalone mode, where a connection is anchored using a different carrier (e.g., the same or different radio access technology).

[0057] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0058] A carrier may be associated with a particular bandwidth of a radio spectrum, and in some examples, a carrier bandwidth may be referred to as a "system bandwidth" of a carrier or wireless communication system 100. For example, a carrier bandwidth may be one of a plurality of bandwidths determined for a carrier of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). A device of the wireless communication system 100 (e.g., a base station 105, a UE 115, or both) may have a hardware configuration that supports communications on a particular carrier bandwidth, or may be configured to support communications on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each serviced UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of a carrier bandwidth.

[0059] The signal waveform transmitted on the carrier may be composed 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 be composed of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further improve the data rate or data integrity of communications with UE 115.

[0060] One or more parameter sets for a carrier may be supported, where the parameter set may include subcarrier spacing (Δf) and cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter sets. 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 by a UE 115 may be limited to the one or more active BWPs.

[0061] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, and the basic time unit can be, for example, T s =1 / (Δf max ·N f ) seconds sampling period, where Δf max It can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources may be organized according to radio frames, each radio frame 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).

[0062] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into multiple time slots. Optionally, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., depending on the length of the cyclic prefix pre-added to each symbol period). In some wireless communication systems 100, the time slot may be further divided into multiple micro-time slots containing one or more symbols. In addition to the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling period. The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0063] A subframe, a time slot, a mini-time slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0064] Physical channels may be multiplexed on a carrier according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a plurality of symbol periods and may be extended across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set 115 of UEs. For example, one or more UEs 115 may monitor or search for control information in a control region according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with information encoded in a control information format having a given payload size. A search space set may include a common search space set configured for sending control information to a plurality of UEs 115, and a UE-specific search space set for sending control information to a specific UE 115.

[0065] Each base station 105 can provide communication coverage via one or more cells, such as macro cells, small cells, hot spots or other types of cells, or any combination thereof. The term "cell" can refer to a logical communication entity used to communicate with the base station 105 (e.g., via a carrier), and can be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), etc.) used to distinguish adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors, such as the capabilities of the base station 105, the range of such a cell can range from a smaller area (e.g., a structure, a subset of a structure) to a larger area. For example, a cell may be or include a building, a subset of a building, or an external space between or overlapping a geographic coverage area 110, etc.

[0066] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to a UE 115 by subscribing to a service provided by a network provider that supports the macro cell. A small cell may be associated with a base station 105 with lower power than a macro cell, and the small cell may operate in a frequency band that is the same or different (e.g., licensed, unlicensed) from the macro cell. A small cell may provide unrestricted access to a UE 115 that has a service subscription to a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed user group (CSG), a UE 115 associated with a user in a home or office). A base station 105 may support one or more cells, and may also use one or more component carriers to support communications on one or more cells.

[0067] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0068] In some examples, the base stations 105 may be mobile, and thus provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0069] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and in some examples, transmissions from different base stations 105 may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0070] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0071] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception, but does not support simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving deep sleep mode when not engaged in active communications, operating over a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0072] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE115 may be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication, and may be supported by one or more mission-critical services, such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include service priorities, 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.

[0073] In some examples, the UE 115 is also able to communicate directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or unable to receive transmissions from the base station 105. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for the D2D communication. In other cases, the D2D communication is performed between the UEs 115 without involving the base station 105.

[0074] In some systems, the D2D communication link 135 can be an example of a communication channel between vehicles (e.g., UE 115), such as a bypass communication channel. In some examples, vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (such as roadside units) via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both.

[0075] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnections to an external network. The control plane entity may manage non-access stratum (NAS) functions of UE 115 served by a base station 105 associated with the core network 130, such as mobility, authentication, and bearer management. User IP packets may be transmitted through user plane entities, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. The operator IP service 150 may include access to the Internet, (multiple) intranets, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0076] Some network devices, such as base stations 105, may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with the UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs), or merged into a single network device (e.g., base station 105).

[0077] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate structures sufficient for a macro cell to provide service to a UE 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and a shorter range (e.g., less than 100 kilometers) than transmission of smaller frequencies and longer waves using the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0078] The wireless communication system 100 may also operate in a super high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz, also known as a centimeter wave band, or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz), also known as a millimeter wave band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between UE 115 and base station 105, and the EHF antennas of the corresponding devices may be smaller and closer than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be used in transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory agency.

[0079] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can use 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 an unlicensed radio frequency spectrum band, devices such as base stations 105 and UEs 115 can use carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands can be based on carrier aggregation configurations and component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0080] The base station 105 or UE 115 may be equipped with multiple antennas that may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be quasi-co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographic locations. The base station 105 may have an antenna array having multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming of signals sent via the antenna ports.

[0081] The base station 105 or UE 115 can use MIMO communication to exploit multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technology may be referred to as spatial multiplexing. For example, multiple signals may be sent by a transmitting device via different antennas or different antenna combinations. Similarly, a receiving device may receive multiple signals via different antennas or different antenna combinations. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are sent to multiple devices.

[0082] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a particular direction relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other direction).

[0083] The base station 105 or the UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions. For example, the base station 105 may send signals based on different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device such as the base station 105, or by a receiving device such as the UE 115) a beam direction for later transmission or reception by the base station 105.

[0084] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device, such as UE 115). In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0085] In some examples, transmissions by a device (e.g., a base station 105 or a UE 115) can be performed using multiple beam directions, and the device can use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 can report feedback indicating precoding weights for one or more beam directions, and the feedback can correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 can send a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which can be precoded or unprecoded. The UE 115 can provide feedback for beam selection, which can be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel codebook, a linear combination codebook, a port selection codebook). Although these techniques are described with reference to signals sent by base station 105 in one or more directions, UE 115 may employ similar techniques to send signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115) or to send signals in a single direction (e.g., for sending data to a receiving device).

[0086] When receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals, a receiving device (e.g., UE 115) can try multiple reception configurations (e.g., directional listening). For example, the receiving device can try multiple reception directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different reception beamforming weight sets (e.g., different directional listening weight sets) applied to the signals received at multiple antenna elements of the antenna array, or by processing the received signals according to different reception beamforming weight sets applied to the signals received at multiple antenna elements of the antenna array, any of which can be referred to as "listening" according to different reception configurations or reception directions. In some examples, the receiving device can use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). According to different reception configuration directions (e.g., the beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions), the single reception configuration can be aligned in the beam direction determined based on listening.

[0087] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly to communicate through logical channels. The media access control (MAC) layer can perform priority processing and multiplex logical channels into transport channels. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission of the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the base station 105 or the core network 130 that supports the radio bearer of the user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0088] UE 115 and base station 105 can support retransmission of data to increase the possibility of successfully receiving data. Hybrid automatic repeat request (HARQ) feedback is a technology for increasing the possibility of correctly receiving data through communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). Under poor radio conditions (e.g., low signal-to-noise ratio conditions), HARQ can improve the throughput of the MAC layer. In some examples, a device can support HARQ feedback for the same time slot, wherein the device can provide HARQ feedback in a specific time slot for data received in the previous symbol in the time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0089] Some wireless communication systems 100 may support broadcasting packets to multiple UEs 115. These packets may be broadcast by a network node, which may be an example of a base station 105, a UE 115, etc. A transmitter may broadcast multiple packets to multiple receivers (e.g., UEs 115). The broadcast may be repeated blindly, and the transmitter does not know the packets that have been decoded by the receiver. That is, if the broadcast system does not utilize feedback associated with the packets, the transmitter may continue to send packets blindly without any indication of the packets that have actually been decoded by the UE 115. Therefore, the transmitter may rebroadcast the packets in a wasteful manner because some packets may have been decoded by all UEs. Therefore, lack of feedback may result in waste, unnecessary packet duplication, and inefficiency.

[0090] The technology described herein supports a packet broadcast design using feedback received from a UE 115. A transmitter (e.g., a base station 105) may identify a set of packets for broadcasting to a plurality of UEs 115, and send a set of network-coded packets based on the set of packets. Each receiving UE 115 may provide feedback associated with decoding of the broadcast packets. For example, feedback received from a particular UE 115 may indicate a subset of packets successfully decoded in a set of packets. The transmitter may determine an updated set of packets based on feedback received from one or more UEs 115. The updated set of packets may be determined based on a set of packets minus the successfully decoded packets included in each subset (e.g., the intersection of subsets). In some cases, the updated set of packets may be determined based on a set of packets minus any successfully decoded packets included in any subset (e.g., the union of subsets). The transmitter may send an updated set of network-coded packets based on the updated set, and continue to update and send packets based on feedback until the updated set of packets is empty. In some examples, the transmitter may then determine an updated set of packets based on the original set by subtracting the intersection of the subsets indicated by the feedback, and transmit the updated set.

[0091] Using this technique, the transmitter can reduce wasted and duplicated packets by retransmitting packets that were not decoded by the UE 115. This can improve the efficiency of the wireless communication system 100, and more specifically, the broadcast system.

[0092] Different types of feedback can support these technologies. For example, a transmitter (e.g., a base station 105) can use a HARQ message received from a UE 115 to update a set of packets. The HARQ message can indicate an acknowledgment (ACK) or a negative acknowledgment (NACK) of one or more packets. Therefore, based on the ACK and NACK, the transmitter can determine which packets are successfully decoded by which UE 115. In some examples, feedback is received via one or more PDCP status reports, one or more RLC status reports, etc. To further support these technologies, the transmitter can configure the UE 115 with network coding parameters, which the UE 115 can use to decode the packets. The transmitter can update various coding metrics during the broadcast to increase the possibility that the UE 115 can decode the packets. For example, the transmitter can receive a channel state information (CSI) report based on receiving a NACK for one or more packets, and update the modulation and coding scheme or coding rate based on the CSI report.

[0093] Figure 2An example of a wireless communication system 200 that supports broadcasting packets using network coding with feedback according to aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 includes a network entity 220 and UEs 115-a, 115-b, and 115-c, which can be Figure 1 The wireless communication system 200 shows an example of a packet broadcast system. The network entity 220 may be Figure 1 Examples of base stations 105, network nodes, transmitters, etc.

[0094] The network entity 220 may configure the UE 115-c with network coding parameters such as a coding matrix, encoding / decoding functions. The UE 115-c may use these parameters to decode the packets. For example, the rows of the coding matrix may indicate the ordering or grouping of network coded packets sent to the UE 115. The network coding parameters may be signaled using medium access control-control element (MAC-CE) signaling, downlink control information (DCI), or RRC signaling. In some cases, multiple sets of network coding parameters may be signaled.

[0095] The network entity 220 may identify a set of packets for transmission to a plurality of UEs 115. In one example, the network entity 220 identifies a set of packets from a pool of packets, which may be a set of packets scheduled for broadcast. In some examples, the broadcast may support a content streaming service, and the packets may correspond to streaming content. Based on the set of packets, the network entity 220 may encode (e.g., using the indicated encoding function and matrix) and send a set 205 of network-coded packets to a plurality of UEs 115-a in a broadcast manner. Each UE 115 may receive and attempt to decode the set 205 of network-coded packets. The UE 115-a may send feedback 210 to the network entity 220, and the feedback 210 may indicate a subset of the set of network-coded packets that the corresponding UE 115-a was able to successfully decode. For example, UE 115-a may send feedback 210 indicating a first subset of the set 205 of packets that UE 115-a was able to successfully decode, while UE 115-b sends feedback 210 indicating a second subset of the set of packets that UE 115-b was able to successfully decode.

[0096] Based on the received feedback 210, the network entity 220 can update the set of packets and send the updated set of network-coded packets 215. The set of packets can be updated by subtracting the packets that are commonly decoded by the UE 115 from the set of packets. If the packet includes each indicated feedback 210, the packet is usually decoded. The commonly decoded packets can be determined by determining the intersection of all subsets of the decoded packets indicated in the feedback 210. In some examples, the set of packets can be updated by subtracting any successfully decoded packets (e.g., the union of subsets) included in any subset. This updated set can represent the commonly required packets. The updated set of network-coded packets 215 is sent to the UE, and the network entity 220 can continue to update and send the updated set of network-coded packets 215 based on the additional feedback 210 until the updated set of packets is empty. That is, when the feedback 210 indicates that each UE 115 has decoded each packet in the set of packets (e.g., a packet pool), the network entity 220 can stop updating and sending. When the network entity 220 updates the set of packets by subtracting any successfully decoded packets included in any subsets (e.g., the union of the subsets), the network entity 220 may stop updating and sending when the feedback 210 indicates that each UE 115 has decoded each packet of the set of packets (e.g., the pool of packets). Thereafter, the network entity 220 may update the original set by subtracting the intersection of packets decoded by the UE 115 (e.g., the commonly decoded packets) from the original set. This process may be repeated until the feedback indicates that the UE 115 has decoded each packet in the set.

[0097] As described herein, feedback 210 may be an example of one or more HARQ messages. In other cases, feedback 210 may be an example of a PDCP status report or an RLC status report. Based on these reports or HARQ messages, network entity 220 may infer packet decoding / recovery results. In some examples, UE 115 may send feedback 210 in the network coding sublayer, and such feedback 210 may directly indicate decoding success / failure corresponding to each packet. Therefore, feedback 210 may directly indicate packet decoding success or failure, rather than inferring packet decoding success or failure based on HARQ messages (e.g., associating HARQ messages with packets). In some cases, one or more UE 115 send CSI reports for MCS selection or rate control. Therefore, based on the received feedback 210 and CSI reports, network entity 220 may adjust the MCS or coding rate to increase the likelihood of successful decoding by UE 115. In some examples, when NACK is sent, a CSI report is sent to request an updated MCS or data coding rate for better data reception.

[0098] As described herein, one or more sets of network coding parameters may be configured at the UE 115. If one set of parameters is configured at one or more UEs 115, and the network entity 220 determines that transmission performance is poor (e.g., feedback 210 indicates that a relatively high number of packets are not decoded), the network entity 220 may send a new set of network coding parameters to the UE 115 (e.g., via MAC-CE or DCI). In other cases, the UE 115 may request an updated set of network coding parameters (e.g., via MAC-CE or uplink control information (UCI)). In either case, after sending the updated set of parameters, subsequent sets of packets may be encoded and timed according to the updated set of parameters. If multiple sets of network coding parameters are synchronized between the network entity 220 and the UE 115, the network entity 220 may send instructions to switch between sets of parameters via MAC-CE or DCI (e.g., based on poor performance or based on a request from the UE 115 received via MAC-CE or UCI).

[0099] In some examples, the encoding function may utilize an encoding matrix. The same encoding function may be used in each transmission, and the set of packets sent may change. The encoding matrix may be a random matrix configured at the network entity 220 and the UE 115. An example encoding matrix is ​​as follows: Each row represents a random combination of packets, and different rows are used for different transmission instances. In the above example, each transmission instance p can be configured as follows: p1 = s1 + s2, p2 = s2, p3 = s1 + s3.

[0100] Figure 3 An example of a process flow diagram 300 for supporting broadcasting packets using network coding with feedback according to aspects of the present disclosure is shown. In some examples, the process flow diagram 300 can implement aspects of the wireless communication system 100. The process flow diagram 300 includes a network entity 305 and a UE 115, which can be Figure 1 and Figure 2 Examples of corresponding devices.

[0101] At 305, the network entity 325 may construct a pool of packets S = {p1, p2 ... pn}. The set of network-coded packets may be encoded using an encoding function f(S), and the set of network-coded packets may be sent to the UE 115. Each UE 115 may send feedback indicating the packets of the set that were successfully decoded. For example, UE 115-d successfully decodes packet p1, UE 115-e successfully decodes packets p2 and p3, and UE 115-f successfully decodes packet p3. At 310, the network entity 325 calculates the commonly decoded packets based on the feedback. In some cases, the commonly decoded packets are determined using the intersection of the subsets of the decoded packets: {p1} & {p2, p3} & {p3} = {}. In this example, there are no commonly decoded packets, so the network entity 325 encodes and sends the set S of packets. More specifically, the network entity 325 does not update the packet pool or the set S of packets, so the network entity 325 continues to send new network-coded packets based on the packet pool S.

[0102] UE 115 sends feedback, and the network entity again calculates the commonly decoded packets at 310: {p1, p3} & {p2, p3} & {p3, p2} = {p3} (e.g., p3 is the commonly decoded packet). At 315, the network entity 325 subtracts the commonly decoded packets from the packet set to update the packet set, and sends the updated packet set (encoded with (f)) to UE 115. At 320, the network entity continues to perform 310 and 315 until the packet has been decoded by UE 115. In some cases, packets may be added to the packet pool during the broadcast. In such a case, the packet set is updated to include the additional packet.

[0103] Figure 4 An example of a process flow diagram 400 for supporting broadcasting packets using network coding with feedback according to aspects of the present disclosure is shown. In some examples, the process flow diagram 400 can implement aspects of the wireless communication system 100. The process flow diagram 400 includes a network entity 405 and a UE 115, which can be Figure 1 and Figure 2 Examples of corresponding devices.

[0104] At 405, the network entity 425 may construct a packet pool S = {p1, p2 ... pn}. A set of network coded packets may be encoded using a coding function f(S), and the set of network coded packets may be sent to the UE 115. Each UE 115 may send feedback indicating the packets of the set that were successfully decoded. For example, UE 115-d successfully decodes packet p1, UE 115-e successfully decodes packets p2 and p3, and UE 115-f successfully decodes packet p3. At 410, the network entity 425 calculates the union of the decoded packets based on the feedback. At 415, the network entity 425 subtracts the union of the decoded packets from the packet pool and sends the updated network coded packets (e.g., encoded using the coding function f()) to the UE 115. The updated set represents the packets that are commonly needed (e.g., not decoded by each UE 115). At 420, the network entity 425 continues to perform 410 and 415 until the packet pool is empty. In some cases, packets may be added to the data packet pool during the broadcast. In this case, the packet set is updated to include the additional packet. When the packet pool is empty, at 430, the network entity 425 can send a network coded packet (encoded using the encoding function f()) based on the set S of original packets minus the intersection of all receiver decoded packets (e.g., commonly decoded packets). This process can be repeated until feedback indicates that the packet is successfully decoded by the UE 115.

[0105] Figure 5 An example of a process flow diagram 500 for supporting broadcasting packets using network coding with feedback according to aspects of the present disclosure is shown. In some examples, the process flow diagram 500 can implement various aspects of the wireless communication system 100. The process flow diagram 500 includes a plurality of UEs 115 and a network node 525. The plurality of UEs 115 can be as described with respect to Figures 1 to 3 Examples of corresponding devices described, and the network node 525 may be as described with respect to Figure 1 Examples of base stations 105 described or as described with respect to Figure 2 and Figure 3 Examples of network entities 220 or 325 are described.

[0106] At 505, the network node 525 may identify a set of packets for broadcasting to the plurality of UEs 115. The set of packets may be identified from a pool of packets including packets scheduled for transmission. At 510, the network node 525 may send a set of network-coded packets to the plurality of UEs 115 based on the set of packets. That is, the network node 525 may encode the set of packets using an encoding function and send the packets to the UEs 115.

[0107] At 515, the network node 525 may receive feedback from each of the one or more UEs in the plurality of UEs 115 indicating successfully decoded packets in the set of packets as a respective subset of the set of packets at each of the one or more UEs 115. The feedback may be received via HARQ signaling, a network coding sublayer, a PDCP status report, or an RLC status report. In some cases, CSI may be received with the feedback.

[0108] At 520, the network node 525 may determine a set of updated packets based on the feedback. In some cases, the set of updated packets may exclude the successfully decoded packets included in each subset. In some cases, an intersection function may be used to determine the commonly decoded packets. Alternatively or additionally, the set of updated packets may be a first set of packets excluding any successfully decoded packets included in any subset. In some cases, determining the second subset may exclude the union of each subset.

[0109] At 530, the network node 525 may send an updated set of network coded packets based on the updated set of packets to the plurality of UEs 115. The updated set of packets may be encoded using an encoding function.

[0110] At 535, the network node 525 may continue to update and send the updated set of network coded packets based on additional feedback received from one or more of the plurality of UEs until the updated set of packets is empty.

[0111] At 540 , the network node 525 may determine a first set of updated packets based on the feedback and the additional feedback, the first set of packets excluding the successfully decoded packets included in each subset. At 545 , the network node 525 may send the first set of updated packets to the plurality of UEs 115 .

[0112] Figure 6 A block diagram 600 of a device 605 supporting broadcasting packets using network coding with feedback according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of a network entity as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0113] 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 broadcasting packets using network coding with feedback, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Fig. 9Examples of aspects of transceiver 920 are described. Receiver 610 may utilize a single antenna or a collection of antennas.

[0114] The communication manager 615 may identify, at a network node, a set of packets for broadcasting to a set of user equipment (UEs), send a set of network coded packets to the set of UEs based on the set of packets, send an updated set of network coded packets to the set of UEs based on the updated set of packets, receive feedback from each of one or more UEs in the set of UEs indicating successfully decoded packets of the set of packets at each of the one or more UEs as a respective subset of the set of packets, determine an updated set of packets excluding the successfully decoded packets included in each subset based on the feedback, and continue to update and send the updated set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the updated set of packets is empty. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0115] The communication manager 615 may identify, at a network node, a first set of packets for broadcasting to a set of user equipment (UEs), send a first set of network coded packets to the set of UEs based on the first set of packets, send a second set of network coded packets to the set of UEs based on a second set of packets, receive feedback from each of one or more of the set of UEs indicating successfully decoded packets of the first set of packets at each of the one or more UEs as a respective subset of the first set of packets, determine a second set of packets based on the feedback, the second set of packets being the first set of packets excluding any successfully decoded packets included in any subset, and continue to update the determination based on additional feedback received from one or more of the set of UEs and send the second set of network coded packets until the second set of packets is empty. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0116] Additionally or alternatively, the communication manager 615 may identify at a network node a first set of packets for broadcasting to a plurality of user equipments (UEs), send a first set of network coded packets to the plurality of UEs based on the first set of packets, receive feedback from each of one or more of the plurality of UEs indicating successfully decoded packets of the first set of packets at each of the one or more UEs as a respective subset of the first set of packets, determine an updated set of packets based on the feedback, send an updated set of network coded packets to the plurality of UEs based on the updated set of packets, and continue to update and send the updated set of network coded packets based on additional feedback received from the one or more of the plurality of UEs until the updated set of packets is empty. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0117] The communication manager 615 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0118] The communication manager 615 or its subcomponents can be physically located in various locations, including being distributed so that part of the functionality is implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in the present disclosure, or a combination thereof.

[0119] Transmitter 620 can transmit signals generated by other components of device 605. In some examples, transmitter 620 can be co-located with receiver 610 in a transceiver module. For example, transmitter 620 can be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The transmitter 620 may utilize a single antenna or a collection of antennas.

[0120] In some examples, the communication manager 615 can be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 610 and transmitter 620 can be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to the mobile device modem to enable wireless transmission and reception on one or more frequency bands.

[0121] The communication manager 615 described herein may be implemented to achieve one or more potential advantages. One implementation may allow the device 605 to more efficiently coordinate the transmission of packets to multiple UEs. More specifically, the transmission of packets is coordinated based on feedback received from the UEs.

[0122] Based on implementing the packet broadcasting techniques described herein, the processor of UE 115 (e.g., as described in reference Fig. 9 As described above, controlling the receiver 610, the transmitter 620 or the transceiver 920) can improve reliability and reduce signaling overhead due to the reduction of repeated transmissions of packets.

[0123] Figure 7 A block diagram 700 of a device 705 that supports broadcast packets using network coding with feedback is shown in accordance with various aspects of the present disclosure. The device 705 may be an example of aspects of the device 505, UE 115, or network entity or node described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 745. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0124] 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 broadcasting packets using network coding with feedback, etc.). The information may be delivered to other components of the device 705. The receiver 710 may be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The receiver 710 may utilize a single antenna or a collection of antennas.

[0125] The communication manager 715 may be an example of aspects of the communication manager 515 as described herein. The communication manager 715 may include a packet identifier 720, a packet transmission interface 725, a feedback interface 730, a packet set update component 735, and a feedback monitoring component 740. The communication manager 715 may be an example of aspects of the communication manager 910 described herein.

[0126] A packet identifier 720 may identify, at a network node, a set of packets for broadcast to a set of user equipments (UEs).

[0127] The packet transmission interface 725 may send a set of network coded packets to the set of UEs based on the set of packets, and send an updated set of network coded packets to the set of UEs based on the updated set of packets.

[0128] Feedback interface 730 may receive feedback from each of one or more UEs in the set of UEs indicating successfully decoded packets of the set of packets as a respective subset of the set of packets at each of the one or more UEs.

[0129] The packet set updating component 735 can determine an updated set of packets based on the feedback. In some examples, the packet set updating component can determine an updated set of packets that excludes successfully decoded packets included in each subset. In some examples, the packet set updating component can determine an updated set of packets that can be a first set of packets that excludes any successfully decoded packets included in any subset.

[0130] Feedback monitoring component 740 can continue updating and sending the updated set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the updated set of packets is empty.

[0131] Transmitter 745 can transmit signals generated by other components of device 705. In some examples, transmitter 745 can be co-located with receiver 710 in a transceiver module. For example, transmitter 745 can be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The transmitter 745 may utilize a single antenna or a collection of antennas.

[0132] Figure 8 A block diagram 800 of a communication manager 805 supporting broadcasting packets using network coding with feedback is shown in accordance with aspects of the present disclosure. The communication manager 805 can be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include a packet identifier 810, a packet transmission interface 815, a feedback interface 820, a packet set update component 825, a feedback monitoring component 830, an intersection component 835, a CSI interface 840, an encoding metric component 845, a configuration component 850, a configuration interface 855, and an encoding component 860. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0133] A packet identifier 810 may identify, at a network node, a set of packets for broadcast to a set of user equipments (UEs). In some examples, the packet identifier 810 may identify a set of packets from a pool of packets scheduled for broadcast to a set of UEs.

[0134] In some examples, packet identifier 810 may identify one or more additional packets for broadcasting to the set of UEs based on one or more additional packets being added to the packet pool.

[0135] The packet transmission interface 815 may send a set of network coded packets to a set of UEs based on the set of packets.

[0136] In some examples, the packet transmission interface 815 may send an updated set of network coded packets to the set of UEs based on the updated set of packets.

[0137] Feedback interface 820 may receive feedback from each of one or more UEs in the set of UEs indicating packets in the set of packets that were successfully decoded at each of the one or more UEs as a respective subset of the set of packets.

[0138] In some examples, feedback interface 820 may receive feedback via a Packet Data Convergence Protocol (PDCP) status report, an RLC status report, or a HARQ message.

[0139] In some examples, feedback interface 820 may receive feedback or additional feedback in a network coding sublayer, where the feedback indicates a decoding status of each packet in a set of packets.

[0140] The packet set updating component 825 can determine an updated set of packets based on the feedback. In some examples, the packet set updating component 825 can determine an updated set of packets that excludes successfully decoded packets included in each subset. In some examples, the packet set updating component 825 can determine an updated set of packets that can be a first set of packets that excludes any successfully decoded packets included in any subset.

[0141] Feedback monitoring component 830 can continue to update and send the updated set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the updated set of packets is empty.

[0142] Packet set updating component 825 can determine an updated first set of packets based on the feedback and the additional feedback, the first set of packets excluding successfully decoded packets included in each subset.

[0143] An intersection component 835 can determine an intersection of each subset to identify successfully decoded packets included in each subset.

[0144] The CSI interface 840 may receive the channel state information message in conjunction with the feedback or in addition to the feedback.

[0145] In some examples, CSI interface 840 may receive a channel state information message based on feedback indicating a negative acknowledgement of one or more packets in a set of packets.

[0146] Coding metric component 845 may determine one or more coding metrics for transmitting a set of updated packets based on the channel state information message.

[0147] In some examples, the coding metric component 845 can determine a modulation and coding scheme, a coding rate, or a combination thereof.

[0148] Configuration component 850 may send an indication of one or more network coding parameters to one or more UEs in the set of UEs, wherein at least an updated set of network coded packets is sent to the set of UEs based on the one or more network coding parameters.

[0149] In some examples, configuration component 850 can send an indication of a network coding algorithm, a network coding function, a network coding matrix, a number of decoding iterations, or a combination thereof.

[0150] In some examples, configuration component 850 may transmit one or more network coding parameters using medium access control-control element (MAC-CE) signaling or downlink control information signaling.

[0151] In some examples, configuring component 850 may use radio resource control signaling to send one or more network coding parameters.

[0152] In some examples, configuring component 850 may use radio resource control signaling to send updates to one or more network coding parameters.

[0153] In some examples, configuration component 850 can send an indication to switch from one or more previous network coding parameters to one or more network coding parameters. In some examples, configuration component 850 can receive the request using medium access control-control element (MAC-CE) signaling or uplink control information signaling.

[0154] Configuration interface 855 can receive a request for one or more network coding parameters from one or more UEs in the set of UEs, wherein an indication of the one or more network coding parameters is sent based on receiving the request.Encoding component 860 can encode the set of packets using an encoding function for transmission to the set of UEs.

[0155] In some examples, encoding component 860 can encode the updated set of packets using an encoding function for transmission to the set of UEs. In some cases, the encoding function includes a matrix, and each row of the matrix indicates a combination of packets.

[0156] Fig. 9 A schematic diagram of a system 900 including a device 905 supporting broadcasting packets using network coding with feedback according to various aspects of the present disclosure is shown. The device 905 may be an example of, or include components of, the device 505, device 605, or network entity described herein. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 935. These components may communicate electronically via one or more buses (e.g., a bus 945).

[0157] The communication manager 910 can identify, at a network node, a set of packets for broadcasting to a set of user equipment (UEs), send a set of network coded packets to the set of UEs based on the set of packets, send an updated set of network coded packets to the set of UEs based on the updated set of packets, receive feedback from each of one or more UEs in the set of UEs, the feedback indicating successfully decoded packets of the set of packets at each of the one or more UEs as a corresponding subset of the set of packets, determine an updated set of packets excluding the successfully decoded packets included in each subset based on the feedback, and continue to update and send the updated set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the updated set of packets is empty.

[0158] Alternatively or additionally, the communication manager 910 may identify, at a network node, a first set of packets for broadcasting to multiple user equipments (UEs), send a first set of network coded packets to the multiple UEs based on the first set of packets, receive feedback from each of one or more of the multiple UEs indicating successfully decoded packets of the first set of packets at each of the one or more UEs as a corresponding subset of the first set of packets, determine an updated set of packets based on the feedback, send an updated set of network coded packets to the multiple UEs based on the updated set of packets, and continue to update and send the updated set of network coded packets based on additional feedback received from one or more of the multiple UEs until the updated set of packets is empty.

[0159] The communication manager 910 can identify, at a network node, a first set of packets for broadcasting to a set of user equipment (UEs), send a first set of network coded packets to the set of UEs based on the first set of packets, send a second set of network coded packets to the set of UEs based on the second set of packets, receive feedback from each of one or more UEs in the set of UEs, the feedback indicating successfully decoded packets of the first set of packets at each of the one or more UEs as a corresponding subset of the first set of packets, determine a second set of packets based on the feedback, the second set of packets being a second set of packets excluding any successfully decoded packets included in any subset, and continue to update the determination based on additional feedback received from one or more UEs in the set of UEs and send the second set of network coded packets until the second set of packets is empty.

[0160] I / O controller 915 can manage input and output signals for device 905. I / O controller 915 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 can utilize an operating system, such as Or other known operating systems. In other cases, I / O controller 915 can represent or interact with a modem, keyboard, mouse, touch screen or similar device. In some cases, I / O controller 915 can be implemented as a part of a processor. In some cases, a user can interact with device 905 via I / O controller 915 or via hardware components controlled by I / O controller 915.

[0161] As described above, the transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links. For example, the transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with other wireless transceivers. The transceiver 920 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate the packets received from the antenna.

[0162] In some cases, a wireless device may include a single antenna 925. However, in some cases, a device may have more than one antenna 925, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0163] The memory 930 may include RAM and ROM. The memory 930 may store computer-readable, computer-executable code 940, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 930 may contain a basic input / output system (BIOS), etc., which may control basic hardware or software operations, such as interaction with peripheral device components or devices.

[0164] The processor 935 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 935 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 935. The processor 935 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., a function or task of supporting broadcasting a packet using network coding with feedback).

[0165] The code 940 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 940 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 940 may not be directly executable by the processor 935, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein.

[0166] Fig.10 A flow chart illustrating a method 1000 for supporting broadcasting packets using network coding with feedback according to aspects of the present disclosure is shown. The operations of the method 1000 may be implemented by a network entity or component thereof as described herein. For example, the operations of the method 1000 may be implemented by reference to Figures 6 to 9 In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the functions described below. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the functions described below.

[0167] At 1005, a network entity may identify, at a network node, a set of packets for broadcasting to a set of user equipment (UE). The operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be described with reference to Figures 6 to 9 The described packet identifier is performed.

[0168] At 1010, the network entity may send a set of network-coded packets to a set of UEs based on the set of packets. The operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0169] At 1015, the network entity may receive feedback from each of one or more UEs in the set of UEs, the feedback indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets. The operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be described with reference to Figures 6 to 9 The feedback interface described is implemented.

[0170] At 1020, the network entity may determine, based on the feedback, a set of updated packets that excludes the successfully decoded packets included in each subset. The operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be described with reference to Figures 6 to 9 Described grouped collection update components to perform.

[0171] At 1025, the network entity may send an updated set of network coded packets to the set of UEs based on the updated set of packets. The operations of 1025 may be performed according to the methods described herein. In some examples, aspects of the operations of 1025 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0172] At 1030, the network entity may continue to update and send the updated set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the updated set of packets is empty. The operations of 1030 may be performed according to the methods described herein. In some examples, aspects of the operations of 1030 may be described with reference to Figures 6 to 9 Describes the feedback monitoring component to perform.

[0173] Fig.11 A flow chart illustrating a method 1100 for supporting broadcast packets using network coding with feedback according to aspects of the present disclosure is shown. The operations of the method 1100 may be implemented by a network entity or component thereof as described herein. For example, the operations of the method 1100 may be implemented by reference to Figures 6 to 9 In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the functions described below. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the functions described below.

[0174] At 1105, a network entity may identify, at a network node, a first set of packets for broadcasting to a set of user equipment (UEs). The operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be described with reference to Figures 6 to 9 The described packet identifier is performed.

[0175] At 1110, the network entity may send a first set of network-coded packets to a set of UEs based on the first set of packets. The operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0176] At 1115, the network entity may receive feedback from each of one or more UEs in the set of UEs, the feedback indicating successfully decoded packets in the first set of packets at each of the one or more UEs as a respective subset of the first set of packets. The operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be described with reference to Figures 6 to 9 The feedback interface described is implemented.

[0177] At 1120, the network entity may determine a second set of packets based on the feedback, the second set of packets being the first set of packets excluding any successfully decoded packets included in any subset. The operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be described with reference to Figures 6 to 9 Described grouped collection update components to perform.

[0178] At 1125, the network entity may send a second set of network-coded packets to the set of UEs based on the second set of packets. The operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0179] At 1130, the network entity may continue to update the determination and send the second set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the second set of packets is empty. The operations of 1130 may be performed according to the methods described herein. In some examples, aspects of the operations of 1130 may be described with reference to Figures 6 to 9 Describes the feedback monitoring component to perform.

[0180] Fig.12A flow chart illustrating a method 1200 for supporting broadcast packets using network coding with feedback according to aspects of the present disclosure is shown. The operations of the method 1200 may be implemented by a network entity or component thereof as described herein. For example, the operations of the method 1200 may be implemented by reference to Figures 6 to 9 In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the functions described below. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the functions described below.

[0181] At 1205, a network entity may identify, at a network node, a first set of packets for broadcasting to a set of user equipment (UEs). The operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be described with reference to Figures 6 to 9 The described packet identifier is performed.

[0182] At 1210, the network entity may send a first set of network-coded packets to a set of UEs based on the first set of packets. The operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0183] At 1215, the network entity may receive feedback from each of the one or more UEs in the set of UEs, the feedback indicating successfully decoded packets in the first set of packets at each of the one or more UEs as a respective subset of the first set of packets. The operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be described with reference to Figures 6 to 9 The feedback interface described is implemented.

[0184] At 1220, the network entity may determine a second set of packets based on the feedback, the second set of packets being the first set of packets excluding any successfully decoded packets included in any subset. The operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be described with reference to Figures 6 to 9 Described grouped collection update components to perform.

[0185] At 1225, the network entity may send a second set of network-coded packets to the set of UEs based on the second set of packets. The operations of 1225 may be performed according to the methods described herein. In some examples, aspects of the operations of 1225 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0186] At 1230, the network entity may continue to update the determination and send the second set of network coded packets based on additional feedback received from one or more UEs in the set of UEs until the second set of packets is empty. The operations of 1230 may be performed according to the methods described herein. In some examples, aspects of the operations of 1230 may be described with reference to Figures 6 to 9 Describes the feedback monitoring component to perform.

[0187] At 1235, the network entity may determine a first set of updated packets based on the feedback and the additional feedback, the first set of packets excluding the successfully decoded packets included in each subset. The operations of 1235 may be performed according to the methods described herein. In some examples, aspects of the operations of 1235 may be described with reference to Figures 6 to 9 Described grouped collection update components to perform.

[0188] At 1240, the network entity may send a first set of updated packets to the set of UEs. The operations of 1240 may be performed according to the methods described herein. In some examples, aspects of the operations of 1240 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0189] Fig.13 A flow chart illustrating a method 1300 for supporting broadcast packets using network coding with feedback according to aspects of the present disclosure is shown. The operations of the method 1300 may be implemented by a network entity or component thereof as described herein. For example, the operations of the method 1300 may be implemented by reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described functions.

[0190] At 1305, the method may include identifying, at a network node, a first set of packets for broadcasting to a set of multiple user equipments (UEs). The operations of 1305 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1305 may be described with reference to Figures 6 to 9 The described packet identifier is performed.

[0191] At 1310, the method may include sending a first set of network-coded packets to a set of multiple UEs based on the first set of packets. The operations of 1310 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1310 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0192] At 1315, the method may include receiving feedback from each of one or more UEs in the set of multiple UEs, the feedback indicating successfully decoded packets in the first set of packets at each of the one or more UEs as a corresponding subset of the first set of packets. The operations of 1315 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1315 may be described with reference to Figures 6 to 9 The feedback interface described is implemented.

[0193] At 1320, the method may include determining an updated set of groups based on the feedback. The operations of 1320 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1320 may be described with reference to Figures 6 to 9 Described grouped collection update components to perform.

[0194] At 1325, the method may include sending updated network coded packets to a set of multiple UEs based on the set of updated packets. The operations of 1325 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1325 may be described with reference to Figures 6 to 9 The packet transmission interface described is implemented.

[0195] At 1330, the method may include continuing to update and send the updated set of network coded packets based on additional feedback received from one or more UEs in the set of multiple UEs until the set of updated packets is empty. The operations of 1330 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1330 may be described with reference to Figures 6 to 9 Describes the feedback monitoring component to perform.

[0196] The following provides a first overview of various aspects of the present disclosure:

[0197] Aspect 1: A method for wireless communication at a network node, comprising: identifying a set of packets for broadcasting to multiple user equipments (UEs) at the network node; sending a set of network-coded packets to the multiple UEs based on the set of packets; receiving feedback from each of one or more of the multiple UEs, the feedback indicating successfully decoded packets in the set of packets at each of the one or more UEs as a corresponding subset of the set of packets; determining an updated set of packets based on the feedback, the set excluding successfully decoded packets included in each subset; sending an updated set of network-coded packets to the multiple UEs based on the updated set of packets; and continuing to update and send the updated set of network-coded packets based on additional feedback received from the one or more of the multiple UEs until the updated set of packets is empty.

[0198] Aspect 2: The method according to aspect 1, wherein determining the set of updated packets comprises: determining an intersection of each subset to identify successfully decoded packets included in each subset.

[0199] Aspect 3: The method according to any one of aspects 1 to 2, wherein receiving feedback comprises: receiving feedback via a packet data convergence protocol (PDCP) status report, a radio link control (RLC) status report, or a hybrid automatic repeat request (HARQ) message.

[0200] Aspect 4: The method according to any one of aspects 1 to 3, wherein receiving feedback comprises: receiving feedback or additional feedback in a network coding sublayer, wherein the feedback indicates a decoding status of each packet in the set of packets.

[0201] Aspect 5: The method according to any one of Aspects 1 to 4 further includes: receiving a channel state information message in combination with feedback or additional feedback; and determining one or more coding metrics for a set of updated packets for transmission based at least in part on the channel state information message.

[0202] Aspect 6: The method according to aspect 5, wherein determining one or more coding metrics includes: determining a modulation and coding scheme, a coding rate, or a combination thereof.

[0203] Aspect 7: The method according to any one of aspects 5 to 6, wherein receiving the channel state information message includes: receiving the channel state information message based at least in part on feedback indicating negative acknowledgement of one or more packets in the set of packets.

[0204] Aspect 8: The method according to any one of Aspects 1 to 7 further includes: sending an indication of one or more network coding parameters to one or more UEs among the multiple UEs, wherein, based on the one or more network coding parameters, at least a set of updated network coded groups is sent to the multiple UEs.

[0205] Aspect 9: The method according to Aspect 8, wherein sending an indication of the one or more network coding parameters comprises: sending an indication of a network coding algorithm, a network coding function, a network coding matrix, a number of decoding iterations, or a combination thereof.

[0206] Aspect 10: A method according to any one of Aspects 8 to 9, wherein sending an indication of the one or more network coding parameters includes: using medium access control-control element (MAC-CE) signaling or downlink control information signaling to send the one or more network coding parameters.

[0207] Aspect 11: The method according to any one of aspects 8 to 10, wherein sending an indication of the one or more network coding parameters comprises: sending the one or more network coding parameters using radio resource control signaling.

[0208] Aspect 12: The method according to any one of aspects 8 to 11, wherein sending an indication of the one or more network coding parameters comprises: sending an update to the one or more network coding parameters using radio resource control signaling.

[0209] Aspect 13: The method according to any one of aspects 8 to 12, wherein sending an indication of the one or more network coding parameters comprises: sending an indication of switching from one or more previous network coding parameters to the one or more network coding parameters.

[0210] Aspect 14: The method according to any one of Aspects 8 to 13 further includes: receiving a request for the one or more network coding parameters from the one or more UEs among the multiple UEs, wherein an indication of the one or more network coding parameters is sent at least in part based on receiving the request.

[0211] Aspect 15: The method according to aspect 14, wherein receiving the request includes: receiving the request using medium access control-control element (MAC-CE) signaling or uplink control information signaling.

[0212] Aspect 16: The method according to any one of aspects 1 to 15, wherein identifying the set of packets comprises: identifying the set of packets from a pool of packets scheduled for broadcasting to the plurality of UEs.

[0213] Aspect 17: The method according to aspect 16 also includes: identifying one or more additional packets for broadcasting to the plurality of UEs based at least in part on the one or more additional packets being added to the packet pool.

[0214] Aspect 18: The method according to any one of Aspects 1 to 17 further includes: encoding a set of packets using a coding function for transmission to the multiple UEs; and encoding an updated set of packets using a coding function for transmission to the multiple UEs.

[0215] Aspect 19: The method according to Aspect 18, wherein the encoding function comprises a matrix, and each row of the matrix indicates a combination of groups.

[0216] Aspect 20: An apparatus for wireless communication at a network node, comprising at least one device for performing the method of any one of aspects 1 to 19.

[0217] Aspect 21: An apparatus for wireless communication at a network node, comprising a processor and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 1 to 19.

[0218] Aspect 22: A non-transitory computer-readable medium storing code for wireless communication at a network node, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 19.

[0219] A second summary of aspects of the disclosure is provided below.

[0220] Aspect 1: A method for wireless communication, comprising: identifying a first set of packets for broadcasting to multiple user equipments (UEs) at a network node; sending a first set of network-coded packets to the multiple UEs based on the first set of packets; receiving feedback from each of one or more of the multiple UEs, the feedback indicating successfully decoded packets in the first set of packets at each of the one or more UEs as a corresponding subset of the first set of packets; determining a second set of packets based on the feedback, the second set of packets being the first set of packets excluding any successfully decoded packets included in any subset; sending a second set of network-coded packets to the multiple UEs based on the second set of packets; and continuing to update the determination and sending of the second set of network-coded packets based on additional feedback received from one or more of the multiple UEs until the second set of packets is empty.

[0221] Aspect 2: The method according to Aspect 1 also includes: determining a first set of updated packets based on the feedback and additional feedback, the first set of packets excluding successfully decoded packets included in each subset; and sending the first set of updated packets to the multiple UEs.

[0222] Aspect 3: The method according to any one of aspects 1 to 2, wherein determining the second subset of the grouping comprises: determining a union of each subset, wherein the second subset is the first subset excluding the union of the subsets.

[0223] Aspect 4: The method according to any one of Aspects 1 to 3, wherein receiving feedback comprises: receiving feedback via a packet data convergence protocol (PDCP) status report, a radio link control (RLC) status report, or a hybrid automatic repeat request (HARQ) message.

[0224] Aspect 5: The method according to any one of aspects 1 to 3, wherein receiving feedback comprises: receiving feedback or additional feedback in a network coding sublayer, wherein the feedback indicates a decoding status of each packet of the first subset.

[0225] Aspect 6: The method according to any one of Aspects 1 to 5 further includes: receiving a channel state information message in combination with feedback or additional feedback; and determining one or more coding metrics for a set of updated first groups for transmission based at least in part on the channel state information message.

[0226] Aspect 7: The method according to aspect 6, wherein determining the one or more coding metrics includes: determining a modulation and coding scheme, a coding rate, or a combination thereof.

[0227] Aspect 8: A method according to any one of aspects 6 to 7, wherein receiving the channel state information message includes: receiving the channel state information message based at least in part on feedback indicating negative acknowledgement of one or more packets in the first set of packets.

[0228] Aspect 9: The method according to any one of Aspects 1 to 8 further includes: sending an indication of one or more network coding parameters to one or more of the multiple UEs, wherein based on the one or more network coding parameters, at least a second set of network coded groups is sent to the multiple UEs.

[0229] Aspect 10: The method according to Aspect 9, wherein sending an indication of the one or more network coding parameters comprises sending an indication of a network coding algorithm, a network coding function, a network coding matrix, a number of decoding iterations, or a combination thereof.

[0230] Aspect 11: A method according to any one of Aspects 9 to 10, wherein sending an indication of the one or more network coding parameters includes: using medium access control-control element (MAC-CE) signaling or downlink control information signaling to send the one or more network coding parameters.

[0231] Aspect 12: The method according to any one of aspects 9 to 11, wherein sending an indication of the one or more network coding parameters comprises: sending the one or more network coding parameters using radio resource control signaling.

[0232] Aspect 13: The method according to any one of aspects 9 to 12, wherein sending an indication of the one or more network coding parameters comprises: sending an update to the one or more network coding parameters using radio resource control signaling.

[0233] Aspect 14: The method according to any one of aspects 9 to 13, wherein sending an indication of the one or more network coding parameters comprises: sending an indication of switching from one or more previous network coding parameters to the one or more network coding parameters.

[0234] Aspect 15: The method according to any one of Aspects 9 to 14 further includes: receiving a request for the one or more network coding parameters from one or more UEs among the multiple UEs, wherein an indication of the one or more network coding parameters is sent at least in part based on receiving the request.

[0235] Aspect 16: The method according to aspect 15, wherein receiving the request comprises: receiving the request using medium access control-control element (MAC-CE) signaling or uplink control information signaling.

[0236] Aspect 17: The method according to any one of aspects 1 to 16, wherein identifying the first set of packets includes: identifying the first set of packets from a pool of packets scheduled for broadcasting to the plurality of UEs.

[0237] Aspect 18: The method according to any one of aspects 17 to 17 further includes: identifying one or more additional packets for broadcasting to the plurality of UEs based at least in part on the one or more additional packets being added to the packet pool.

[0238] Aspect 19: The method according to any one of Aspects 1 to 18 further includes: encoding the first set of packets using a coding function for transmission to the multiple UEs; and encoding the updated first set of packets using a coding function for transmission to the multiple UEs.

[0239] Aspect 20: The method according to Aspect 19, wherein the encoding function comprises a matrix, and each row of the matrix indicates a combination of groups.

[0240] Aspect 21: An apparatus for wireless communication, comprising at least one device for performing the method of any one of aspects 1 to 20.

[0241] Aspect 22: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 1 to 20.

[0242] Aspect 23: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 20.

[0243] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or modified, and other implementations are possible. Furthermore, aspects of two or more methods may be combined.

[0244] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems 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 techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies explicitly mentioned herein.

[0245] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips cited throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0246] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration).

[0247] 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 or transmitted as one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented in different physical locations.

[0248] Computer-readable media include both non-temporary computer storage media and communication media, including any medium that is convenient for transferring a computer program from one place to another.Non-temporary storage media can be any available medium that can be accessed by a general or special computer.As an example and not limitation, non-temporary computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or may be used to carry or store desired program code devices in the form of instructions or data structures and any other non-temporary medium that can be accessed by a general or special computer or a general or special processor.Similarly, any connection is properly referred to as a computer-readable medium.For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves are used to transmit software from a website, server or other remote source, coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of computer-readable media. Disk and disc, as used herein, includes 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.

[0249] As used herein, including in the claims, "or" used in a list of items (e.g., a list of items beginning with a phrase such as "at least one" or "one or more") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0250] In the drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number, the second reference number being used to distinguish similar parts. If only the first reference number is used in the specification, the description applies to any one similar component having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0251] The description set forth herein, in conjunction with the accompanying drawings, describes example configurations and does not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, these technologies may be implemented without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0252] The description provided herein is to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but conforms to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a network node, comprising: identifying, at a network node, a set of packets for broadcasting to a plurality of user equipments (UEs), each packet in the set of packets being intended for each UE in the plurality of UEs; Based on the set of packets, before receiving feedback associated with the set of packets, sending a set of network coded packets to the plurality of UEs; receiving the feedback from each of one or more of the plurality of UEs, the feedback indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets; Determine a set of updated groups according to the feedback; sending an updated set of network coded packets to the plurality of UEs based on the updated set of packets; and Based on additional feedback received from the one or more UEs of the plurality of UEs, updating and sending the updated set of network coded packets continues until the updated set of packets is empty.

2. The method according to claim 1, wherein: The updated set of packets excludes successfully decoded packets included in each subset; and Determining an updated set of packets includes determining an intersection of each subset to identify successfully decoded packets included in each subset.

3. The method according to claim 1, further comprising: determining, after the set of updated packets is empty, a second set of updated packets excluding successfully decoded packets included in each subset based on the feedback and the additional feedback; and A second set of updated packets is sent to the plurality of UEs.

4. The method according to claim 1, wherein: The updated set of packets is a set of packets excluding any successfully decoded packets included in any subset; and Determining the updated set of groups includes determining a union of each subset.

5. The method according to claim 1, wherein: Receiving feedback includes: Feedback is received via a Packet Data Convergence Protocol (PDCP) status report, a Radio Link Control (RLC) status report, or a Hybrid Automatic Repeat Request (HARQ) message.

6. The method according to claim 1, wherein: Receiving feedback includes: Feedback or additional feedback is received in a network coding sublayer, wherein the feedback indicates a decoding status of each packet in the set of packets.

7. The method according to claim 1, further comprising: receiving a channel state information message in combination with feedback or in addition to feedback; and Based at least in part on the channel state information message, one or more coding metrics are determined for use in transmitting a set of updated packets.

8. The method according to claim 7, wherein: Determining the one or more encoding metrics comprises: A modulation and coding scheme, a coding rate, or a combination thereof is determined.

9. The method according to claim 7, wherein: Receiving a channel state information message includes: A channel state information message is received based at least in part on feedback indicating a negative acknowledgement of one or more packets in the set of packets.

10. The method according to claim 1, further comprising: An indication of one or more network coding parameters is sent to one or more UEs of the plurality of UEs, wherein at least an updated set of network coded packets is sent to the plurality of UEs based on the one or more network coding parameters.

11. The method according to claim 10, wherein: The sending of the indication of the one or more network coding parameters comprises: An indication of a network coding algorithm, a network coding function, a network coding matrix, a number of decoding iterations, or a combination thereof is sent.

12. The method according to claim 10, wherein: The sending of the indication of the one or more network coding parameters comprises: The one or more network coding parameters are sent using medium access control - control element (MAC-CE) signaling or downlink control information signaling.

13. The method according to claim 10, wherein: The sending of the indication of the one or more network coding parameters comprises: The one or more network coding parameters are sent using radio resource control signaling.

14. The method according to claim 10, wherein: The sending of the indication of the one or more network coding parameters comprises: Updates to the one or more network coding parameters are sent using radio resource control signaling.

15. The method according to claim 10, wherein: The sending of the indication of the one or more network coding parameters comprises: An indication is sent to switch from one or more previous network coding parameters to the one or more network coding parameters.

16. The method according to claim 10, further comprising: A request for the one or more network coding parameters is received from the one or more UEs of the plurality of UEs, wherein the indication of the one or more network coding parameters is sent based at least in part on receiving the request.

17. The method according to claim 16, wherein: Receiving a request includes: The request is received using Medium Access Control - Control Element (MAC-CE) signaling or uplink control information signaling.

18. The method according to claim 1, wherein: The set of identification groups includes: A set of packets is identified from a pool of packets scheduled for broadcast to the plurality of UEs.

19. The method according to claim 18, further comprising: Based at least in part on one or more additional packets being added to the pool of packets, the one or more additional packets are identified for broadcasting to the plurality of UEs.

20. The method of claim 1, further comprising: encoding the set of packets using a coding function for transmission to the plurality of UEs; and The set of updated packets is encoded using a coding function for transmission to the plurality of UEs.

21. The method according to claim 20, wherein: The encoding function includes a matrix, and each row of the matrix indicates a combination of groups.

22. A network node for wireless communication, comprising: processor, a memory coupled to the processor; and Instructions, stored in the memory and executable by the processor, cause the network node to: identifying, at a network node, a set of packets for broadcasting to a plurality of user equipments (UEs), each packet in the set of packets being intended for each UE in the plurality of UEs; Based on the set of packets, before receiving feedback associated with the set of packets, sending a set of network coded packets to the plurality of UEs; receiving the feedback from each of one or more of the plurality of UEs, the feedback indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets; Determine a set of updated groups according to the feedback; sending an updated set of network coded packets to the plurality of UEs based on the updated set of packets; and Based on additional feedback received from the one or more UEs of the plurality of UEs, updating and sending the updated set of network coded packets continues until the updated set of packets is empty.

23. The network node according to claim 22, wherein: The updated set of packets excludes successfully decoded packets included in each subset; and The instructions to determine the set of updated packets are executable by the processor to cause the network node to determine an intersection of each subset to identify successfully decoded packets included in each subset.

24. The network node of claim 22, wherein: The updated set of packets is a set of packets excluding any successfully decoded packets included in any subset; and The instructions to determine the set of updated packets are executable by the processor to cause the network node to determine a union of each subset.

25. A network node for wireless communication, comprising: means for identifying, at a network node, a set of packets for broadcasting to a plurality of user equipments (UEs), each packet in the set of packets being intended for each UE in the plurality of UEs; means for sending, based on the set of packets, a network coded set of packets to the plurality of UEs prior to receiving feedback associated with the set of packets; means for receiving the feedback from each of one or more of the plurality of UEs, the feedback indicating successfully decoded packets from the set of packets at each of the one or more UEs as a respective subset of the set of packets; means for determining an updated set of groups based on the feedback; means for sending an updated set of network coded packets to the plurality of UEs based on the updated set of packets; and Means for continuing to update and send an updated set of network coded packets based on additional feedback received from the one or more UEs of the plurality of UEs until the updated set of packets is empty.

26. The network node according to claim 25, wherein: The updated set of packets excludes successfully decoded packets included in each subset; and The means for determining an updated set of packets includes means for determining an intersection of each subset to identify successfully decoded packets included in each subset.

27. The network node of claim 25, wherein: The updated set of packets is a set of packets excluding any successfully decoded packets included in any subset; and The means for determining the updated set of groups includes means for determining a union of each subset.

28. A non-transitory computer readable medium storing code for wireless communication at a network node, the code comprising instructions executable by a processor to: identifying, at a network node, a set of packets for broadcasting to a plurality of user equipments (UEs), each packet in the set of packets being intended for each UE in the plurality of UEs; Based on the set of packets, before receiving feedback associated with the set of packets, sending a set of network coded packets to the plurality of UEs; receiving the feedback from each of one or more of the plurality of UEs, the feedback indicating successfully decoded packets in the set of packets at each of the one or more UEs as a respective subset of the set of packets; Determine a set of updated groups according to the feedback; sending an updated set of network coded packets to the plurality of UEs based on the updated set of packets; and Based on additional feedback received from the one or more UEs of the plurality of UEs, updating and sending the updated set of network coded packets continues until the updated set of packets is empty.

29. The non-transitory computer readable medium of claim 28, wherein: The updated set of packets excludes successfully decoded packets included in each subset; and The instructions to determine the set of updated packets are executable to determine the intersection of each subset to identify the successfully decoded packets included in each subset.

30. The non-transitory computer readable medium of claim 28, wherein: The updated set of packets is a set of packets excluding any successfully decoded packets included in any subset; and The instructions for determining a set of updated groups can be executed to determine a union of each subset.

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