WO2021223047A1 - Schéma de rétroaction pour codes raptor systématiques - Google Patents

Schéma de rétroaction pour codes raptor systématiques Download PDF

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Publication number
WO2021223047A1
WO2021223047A1 PCT/CN2020/088561 CN2020088561W WO2021223047A1 WO 2021223047 A1 WO2021223047 A1 WO 2021223047A1 CN 2020088561 W CN2020088561 W CN 2020088561W WO 2021223047 A1 WO2021223047 A1 WO 2021223047A1
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WIPO (PCT)
Prior art keywords
code blocks
transmission
code
wireless device
redundancy version
Prior art date
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PCT/CN2020/088561
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English (en)
Inventor
Kangqi LIU
Changlong Xu
Liangming WU
Jian Li
Hao Xu
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/088561 priority Critical patent/WO2021223047A1/fr
Publication of WO2021223047A1 publication Critical patent/WO2021223047A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1628—List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers

Definitions

  • the following relates generally to wireless communications and more specifically to a feedback scheme for systematic raptor codes.
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems.
  • 4G systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may be referred to as New Radio (NR) systems.
  • a wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • the described techniques relate to improved methods, systems, devices, and apparatuses that support feedback for systematic fountain coding procedures.
  • the described techniques provide for feedback signaling for transmissions encoded via a systematic fountain coding procedure which reduce feedback overhead and/or retransmission overhead within the wireless communications system.
  • a wireless device may be configured to receive a transmission including a first set of code blocks encoded via a systematic fountain coding procedure.
  • the wireless device may be configured to transmit a feedback message including a numerical quantity of CBs of the first transmission which are associated with a negative acknowledgement (NACK) .
  • NACK negative acknowledgement
  • the transmitting wireless device may perform a second transmission including a second set of code blocks encoded via the fountain coding procedure based on the feedback message.
  • a numerical quantity of code blocks within the second set of code blocks may be equal to or greater than the numerical quantity indicated in the feedback message.
  • the techniques described herein may enable wireless devices of a wireless communications system to provide feedback for systematic fountain coding procedures without unnecessarily increasing signaling overhead associated with feedback signaling and/or retransmission signaling.
  • a method of wireless communications at a wireless device of a wireless communications system may include receiving, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version, transmitting, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with negative acknowledgement, and receiving, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version, transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with negative acknowledgement, and receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • the apparatus may include means for receiving, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version, transmitting, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with negative acknowledgement, and receiving, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • a non-transitory computer-readable medium storing code for wireless communications at a wireless device of a wireless communications system is described.
  • the code may include instructions executable by a processor to receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version, transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with negative acknowledgement, and receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • receiving the second transmission including the second set of code blocks may include operations, features, means, or instructions for receiving a numerical quantity of code blocks of the second set of code blocks which may be equal to the numerical quantity of code blocks of the first transmission associated with negative acknowledgement.
  • receiving the second transmission including the second set of code blocks may include operations, features, means, or instructions for receiving a numerical quantity of code blocks of the second set of code blocks which may be greater than the numerical quantity of code blocks of the first transmission associated with negative acknowledgement.
  • each code block of the second set of code blocks may be based on a code block of the first set of code blocks which may be associated with negative acknowledgement indicated in the first feedback message and one or more additional code blocks of the first set of code blocks.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for encoding the one or more additional code blocks of the first set of code blocks based on the second redundancy version, and decoding each code block of the second set of code blocks based on the code block of the first set of code blocks which may be associated with negative acknowledgement and the encoding of the one or more additional code blocks of the first set of code blocks.
  • decoding each code block of the second set of code blocks may include operations, features, means, or instructions for performing a cyclic redundancy check (CRC) procedure on each code block of the second set of code blocks based on the code block of the first set of code blocks which may be associated with negative acknowledgement and the one or more additional code blocks of the first set of code blocks.
  • CRC cyclic redundancy check
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for decoding at least one code block of the second set of code blocks via a soft combining procedure.
  • the at least one code block of the second set of code blocks may be based on a code block of the first set of code blocks which may be associated with negative acknowledgement
  • decoding the at least one code block of the second set of code blocks via the soft combining procedure may include operations, features, means, or instructions for performing the soft combining procedure based on the at least one code block transmitted via the second redundancy version and the code block of the first set of code blocks which may be associated with negative acknowledgement.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the second wireless device, a second feedback message including a numerical quantity of code blocks of the second transmission associated with negative acknowledgement, and receiving, from the second wireless device, a third transmission based on the second feedback message, the third transmission including a third set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the third set of code blocks may be received according to a third redundancy version different from the first redundancy version and the second redundancy version.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a configuration message including an indication of at least one of the first redundancy version or the second redundancy version.
  • the configuration message includes DCI.
  • the systematic fountain coding procedure includes at least one of a Luby transform (LT) coding procedure, a rapid tornado (Raptor) coding procedure, or both.
  • LT Luby transform
  • RV rapid tornado
  • a method of wireless communications at a wireless device of a wireless communications system may include encoding a first set of code blocks via a systematic fountain coding procedure, performing, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version, receiving, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with negative acknowledgement, and performing, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version.
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to encode a first set of code blocks via a systematic fountain coding procedure, perform, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version, receive, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with negative acknowledgement, and perform, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version.
  • the apparatus may include means for encoding a first set of code blocks via a systematic fountain coding procedure, performing, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version, receiving, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with negative acknowledgement, and performing, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version.
  • a non-transitory computer-readable medium storing code for wireless communications at a wireless device of a wireless communications system is described.
  • the code may include instructions executable by a processor to encode a first set of code blocks via a systematic fountain coding procedure, perform, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version, receive, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with negative acknowledgement, and perform, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version.
  • performing the second transmission including the second set of code blocks may include operations, features, means, or instructions for performing the second transmission including a numerical quantity of code blocks of the second set of code blocks which may be equal to the numerical quantity of code blocks of the first transmission associated with negative acknowledgement.
  • performing the second transmission including the second set of code blocks may include operations, features, means, or instructions for performing the second transmission including a numerical quantity of code blocks of the second set of code blocks which may be greater than the numerical quantity of code blocks of the first transmission associated with negative acknowledgement.
  • each code block of the second set of code blocks may be based on a code block of the first set of code blocks which may be associated with negative acknowledgement indicated in the first feedback message and one or more additional code blocks of the first set of code blocks.
  • encoding the first set of code blocks via the systematic fountain coding procedure may include operations, features, means, or instructions for precoding a set of source code blocks to generate a set of intermediate code blocks, and mapping the set of intermediate code blocks to the first set of code blocks based on a degree distribution.
  • precoding the set of source code blocks to generate the set of intermediate code blocks may include operations, features, means, or instructions for generating one or more redundant intermediate code blocks based on the set of source code blocks.
  • generating the one or more redundant intermediate code blocks may include operations, features, means, or instructions for generating one or more low-density parity-check (LDPC) code blocks.
  • LDPC low-density parity-check
  • generating the one or more LDPC code blocks may include operations, features, means, or instructions for generating the one or more LDPC code blocks such that three copies of each source code block of the set of source code blocks may be included within the one or more LDPC code blocks.
  • generating the one or more redundant intermediate code blocks may include operations, features, means, or instructions for generating one or more half-code blocks.
  • the set of intermediate code blocks may be mapped to the first set of code blocks based on an LT coding procedure, a Raptor coding procedure, or both.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the second wireless device, a second feedback message including a numerical quantity of code blocks of the second transmission associated with negative acknowledgement, and performing, to the second wireless device, a third transmission based on the second feedback message, the third transmission including a third set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the third set of code blocks may be transmitted according to a third redundancy version different from the first redundancy version and the second redundancy version.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a configuration message including an indication of at least one of the first redundancy version or the second redundancy version.
  • the configuration message includes DCI.
  • FIG. 1 illustrates an example of a wireless communications system that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • FIG. 2 illustrates an example of a wireless communications system that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates an example of an encoding scheme that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • FIGs. 4–5 illustrate examples of schematic diagrams that support feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • FIG. 6 illustrates an example of a process flow that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • FIGs. 7 and 8 show block diagrams of devices that support feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • FIG. 9 shows a block diagram of a communications manager that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • FIG. 10 shows a diagram of a system including a base station and/or a user equipment (UE) that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • UE user equipment
  • FIGs. 11 through 15 show flowcharts illustrating methods that support feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • Some wireless communication systems may include network nodes that exchange packets via integrated access and backhaul (IAB) links.
  • a network node such as a user equipment (UE) , a base station, an IAB relay node, or another wireless device, may encode packets before transmission to improve reliability of a destination node successfully receiving the transmitted information.
  • encoded packets may provide redundancy, which may be used to correct errors that result from the transmission environment (e.g., path loss, obstacles, etc. ) .
  • Some examples of encoding algorithms with error correcting codes include fountain coding procedures, such as Luby transform (LT) coding procedures or rapid tornado (Raptor) coding procedures.
  • a fountain coding procedure may be an example of a rateless coding procedure, where a set of source code blocks (e.g., K source code blocks) may be encoded as any quantity of encoding code blocks (e.g., a quantity of encoding code blocks greater than K source code blocks) .
  • Encoding the source code blocks may include combining one or more source code blocks into each encoding code block.
  • the encoding may include using one or more degree distributions, where the degree distributions represent a probability mass function of a set of degrees d i (e.g., d 1 , d 2 , d 3 , etc. ) .
  • the probability of randomly selecting a degree d i (i.e., a degree with index i) from the degree distribution may be represented by ⁇ (i) .
  • the degree d i may represent the quantity of source code blocks which may be combined into a given encoding code block.
  • the encoding code blocks may be transmitted from a transmitting wireless device (e.g., UE, base station) to a receiving wireless device (e.g., UE, base station) .
  • the code blocks may be encoded and transmitted such that a receiving wireless device may be able to reassemble the original data (e.g., original source code blocks) even in cases where the receiving wireless device does not successfully receive or decode all the transmitted code blocks.
  • the transmitting wireless device may retransmit all code blocks upon receiving a feedback message.
  • the retransmission overhead e.g., signaling overhead associated with the retransmission
  • the retransmission overhead may be unnecessarily large and exhibit high bandwidth consumption.
  • the receiving wireless device may transmit a NACK for each code block which is not successfully received or decoded.
  • the feedback overhead e.g., signaling overhead associated with feedback (NACK) messages
  • the receiving wireless device may transmit a NACK for each CBG which was not successfully received or decoded, and the transmitting device may retransmit all CBGs for which a NACK is received.
  • the retransmission overhead may be unnecessarily high when the CBG is large, and feedback overhead may be unnecessarily high when the CBG is small.
  • a wireless device e.g., UE, base station
  • a wireless device may be configured to provide feedback indicating a numerical number of code blocks which were not successfully received or decoded from a transmission containing multiple code blocks.
  • a wireless device may receive a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure.
  • systematic fountain coding procedures may refer to fountain coding procedures which generate encoding code blocks from a number K source code blocks such that the first K encoding code blocks are the same as the K source code blocks.
  • the wireless device may be configured to transmit a feedback message including a numerical quantity of code blocks of the first transmission which are associated with a NACK. For example, if the receiving wireless device does not successfully receive and/or decode two code blocks of the first transmission, the receiving wireless device may transmit a feedback message including an indication of “2” indicating that two code blocks are associated with a NACK. Subsequently, the transmitting wireless device may perform a second transmission including a second set of code blocks encoded via the systematic fountain coding procedure based on the feedback message. A numerical quantity of code blocks within the second set of code blocks may be equal to or greater than the numerical quantity indicated in the feedback message. For instance, in this example, the second set of code blocks may include two code blocks.
  • the techniques described herein may drastically reduce the amount of feedback and/or retransmission overhead associated with systematic fountain coding feedback signaling.
  • the feedback overhead of the present disclosure may be reduced from 152 bits to 8 bits, thereby reducing network overhead and power consumption of the wireless devices.
  • the soft combining gain of each transmission of code blocks will not be lost, thereby improving the probability of successful decoding.
  • aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are additionally described in the context of an example encoding scheme, example schematic diagrams, and a flow diagram. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for determining a degree distribution in a multi-hop network.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130.
  • the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • LTE-A Pro LTE-A Pro
  • NR New Radio
  • the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.
  • ultra-reliable e.g., mission critical
  • the base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities.
  • the base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125.
  • Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125.
  • the coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.
  • the UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times.
  • the UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1.
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.
  • network equipment e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment
  • the base stations 105 may communicate with the core network 130, or with one another, or both.
  • the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface) .
  • the base stations 105 may communicate with one another over the backhaul links 120 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) , or indirectly (e.g., via core network 130) , or both.
  • the backhaul links 120 may be or include one or more wireless links.
  • One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.
  • a base transceiver station a radio base station
  • an access point a radio transceiver
  • a NodeB an eNodeB (eNB)
  • eNB eNodeB
  • a next-generation NodeB or a giga-NodeB either of which may be referred to as a gNB
  • gNB giga-NodeB
  • a UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples.
  • a UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer.
  • PDA personal digital assistant
  • a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.
  • WLL wireless local loop
  • IoT Internet of Things
  • IoE Internet of Everything
  • MTC machine type communications
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • devices such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • the UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers.
  • the term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125.
  • a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • BWP bandwidth part
  • Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling.
  • the wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation.
  • a UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration.
  • Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • MCM multi-carrier modulation
  • OFDM orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
  • the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) .
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.
  • Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) .
  • Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
  • SFN system frame number
  • Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration.
  • a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots.
  • each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing.
  • Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
  • a subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) .
  • TTI duration e.g., the number of symbol periods in a TTI
  • the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • a control region e.g., a control resource set (CORESET)
  • CORESET control resource set
  • a control region for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier.
  • One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115.
  • one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner.
  • An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size.
  • Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.
  • a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110.
  • 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.
  • the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.
  • the wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof.
  • the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications.
  • the UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) .
  • Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) .
  • MCPTT mission critical push-to-talk
  • MCVideo mission critical video
  • MCData mission critical data
  • Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications.
  • the terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.
  • a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol) .
  • D2D device-to-device
  • P2P peer-to-peer
  • One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
  • Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105.
  • groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group.
  • a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.
  • the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • the core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management function
  • S-GW serving gateway
  • PDN Packet Data Network gateway
  • UPF user plane function
  • the control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130.
  • NAS non-access stratum
  • User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions.
  • the user plane entity may be connected to the network operators IP services 150.
  • the operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
  • Some of the network devices may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) .
  • Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) .
  • Each access network transmission entity 145 may include one or more antenna panels.
  • various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .
  • the wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors.
  • the transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • the wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance.
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
  • a base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
  • the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.
  • the base stations 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing.
  • the multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas.
  • Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) .
  • Different spatial layers may be associated with different antenna ports used for channel measurement and reporting.
  • MIMO techniques include single-user MIMO (SU-MIMO) , where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , where multiple spatial layers are transmitted to multiple devices.
  • SU-MIMO single-user MIMO
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
  • a base station 105 or a UE 115 may use beam sweeping techniques as part of beam forming operations.
  • a base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115.
  • Some signals e.g., synchronization signals, reference signals, beam selection signals, or other control signals
  • the base station 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission.
  • Transmissions in different beam directions may be used to identify (e.g., by a transmitting device, such as a base station 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the base station 105.
  • a transmitting device such as a base station 105
  • a receiving device such as a UE 115
  • Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
  • the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted in one or more beam directions.
  • a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions and may report to the base station 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
  • transmissions by a device may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from a base station 105 to a UE 115) .
  • the UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more sub-bands.
  • the base station 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded.
  • a reference signal e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS)
  • CRS cell-specific reference signal
  • CSI-RS channel state information reference signal
  • the UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) .
  • PMI precoding matrix indicator
  • codebook-based feedback e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook
  • a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
  • a receiving device may try multiple receive configurations (e.g., directional listening) when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
  • receive configurations e.g., directional listening
  • a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions.
  • receive beamforming weight sets e.g., different directional listening weight sets
  • a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
  • SNR signal-to-noise ratio
  • the wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack.
  • communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based.
  • a Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency.
  • the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting radio bearers for user plane data.
  • RRC Radio Resource Control
  • transport channels may be mapped to physical channels.
  • the UEs 115 and the base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly over a communication link 125.
  • HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) .
  • FEC forward error correction
  • ARQ automatic repeat request
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions) .
  • a device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
  • the UEs 115 and the base stations 105 of the wireless communications system 100 may be configured to support communications which enable feedback for systematic fountain coding procedures.
  • a UE 115 may encode a set of code blocks via a systematic fountain coding procedure, and may perform (e.g., transmit) a first transmission to a base station 105, where the first transmission includes the first set of code blocks.
  • the first set of code blocks may be transmitted according to a first redundancy version.
  • the base station 105 may determine a numerical number of code blocks of the first set of code blocks (e.g., a number of code blocks of the first transmission) which are associated with a NACK.
  • the base station 105 may transmit a feedback message to the UE 115 including an indication of the number of code blocks associated with the NACK.
  • the UE 115 may subsequently perform a second transmission including a second set of code blocks.
  • the second transmission including the second set of code blocks may be performed/transmitted based on the feedback message and/or the indication of the numerical quantity of code blocks associated with eth NACK.
  • the second set of code blocks may include a numerical number of code blocks which is greater than or equal to the numerical number of code blocs associated with the NACK.
  • aspects described herein may provide for efficient feedback signaling and techniques for systematic fountain coding procedures. More specifically, aspects described herein may significantly reduce the feedback overhead and/or retransmission overhead as compared to other feedback schemes for fountain coding procedures.
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the wireless communications system 200 may implement aspects of the wireless communications system 100.
  • the wireless communications system 200 may include a base station 105-a and a UE 115-a, which may be examples of a base station 105 and UEs 115 as described with reference to FIG. 1.
  • the UE 115-a and the base station 105-a of the wireless communications system 200 may support communications for providing HARQ feedback in the context of a systematic fountain coding procedure.
  • the UE 115-a and/or the base station 105-a may be configured to determine a numerical quantity of code blocks of a transmission encoded via a fountain coding procedure which are associated with a NACK, and transmit feedback messages including an indication of the numerical quantity.
  • the UE 115-a and/or the base station 105-a may then be configured to perform additional transmissions based on the received feedback messages.
  • the UE 115-a and the base station 105-a illustrated in FIG. 2 may be configured to both perform (e.g., transmit) and receive transmissions (e.g., code blocks) which are encoded via a systematic fountain coding procedure.
  • the UE 115-a and the base station 105-a may both generally be referred to as “transmitting wireless devices” and/or “receiving wireless devices, ” depending on the given direction of transmissions being discussed.
  • some examples may be described in the context of the base station 105-a as the “transmitting wireless device, ” and the UE 115-a as the “receiving wireless device.
  • transmitting wireless devices and “receiving wireless devices, ” and like terms, may be understood to refer to any wireless device known in the art including, but not limited to, UEs 115, base stations 105, IAB nodes, and the like.
  • the base station 105-a may serve geographic coverage area 110-a.
  • the UE 115-a may communicate with the base station 105-a via a communication link 205, which may be an example of an NR link between the UE 115-a and the base station 105-a.
  • the communication link 205 may include an example of an access link (e.g., a Uu link) .
  • the communication link 205 may include a bi-directional link that includes both uplink and downlink.
  • the UE 115-a may transmit uplink signals, such as uplink control signals or uplink data signals, to the base station 105-a using the communication link 205 and the base station 105-a may transmit downlink signals, such as downlink control signals or downlink data signals, to the UE 115-a using the communication link 205.
  • uplink signals such as uplink control signals or uplink data signals
  • downlink signals such as downlink control signals or downlink data signals
  • the base station 105-a and the UE 115-a may be communicatively coupled via one or more relay nodes (e.g., relay wireless devices or intermediate wireless devices) .
  • relay nodes e.g., relay wireless devices or intermediate wireless devices
  • transmissions from the base station 105-a to the UE 115-a may be relayed via one or more relay/intermediate wireless devices.
  • the base station 105-a and the UE 115-a may be communicatively coupled via one or more communications links including, but not limited to, the communication link 205, a communication link between the base station 105-a and a relay wireless device, communications links between two relay wireless devices, a communication link between the UE 115-a and a relay wireless device, and the like.
  • the UE 115-a or the base station 105-a may encode sets of code blocks via a systematic fountain coding procedure.
  • the UE 115-a or the base station 105-b may be configured to encode data including a set of source code blocks to a set of encoding code blocks according to an encoding scheme which will be described in further detail herein with respect to FIGs. 3–5.
  • the fountain coding procedure may include any fountain coding procedure known in the art including, but not limited to, an LT coding procedure, a Raptor coding procedure, or both.
  • the UE 115-a or the base station 105-a may transmit the sets of encoding code blocks via the communication link 205.
  • the base station 105-a may perform a first transmission to the UE 115-a via the communication link 205, where the first transmission includes the first set of code blocks 210.
  • the base station 105-a may transmit a configuration message to the UE 115-a including an indication of the first redundancy version.
  • DCI downlink control information
  • the UE 115-a may receive the first transmission (e.g., the first set of code blocks 210) via the communication link 205.
  • the UE 115-a may further decode (or attempt to decode) each of the code blocks of the first set of code blocks 210 according to a fountain decoding procedure.
  • the UE 115-a may decode (or attempt to decode) the code blocks of the first set of code blocks 210 according to an encoding scheme which will be described in further detail herein with respect to FIGs. 3–5.
  • the UE 115-a may be configured to perform the fountain decoding procedures based on the received code blocks and the determined redundancy version.
  • one or more code blocks of the first set of code blocks 210 may not be successfully received and/or decoded at the UE 115-a. For example, some code blocks may be lost, erased, or otherwise interrupted during transmission from the base station 105-a to the UE 115-a via the communication link 205. Similarly, in the context of a multi-hop network, some code blocks may be lost, erased, or otherwise interrupted as the first set of code blocks 210 is transmitted from the base station 105-a to the UE 115-a via one or more relay wireless devices. By way of another example, some code blocks of the first set of code blocks 210 which are successfully received at the UE 115-a may be unable to be decoded.
  • the UE 115-a may determine a numerical quantity of code blocks of the first set of code blocks 210 which are associated with a NACK.
  • Code blocks which are associated with a NACK may include code blocks which were not successfully received at the UE 115-a (e.g., lost, erased, or otherwise interrupted prior to arriving at UE 115-a) .
  • Code blocks which are associated with a NACK may additionally or alternatively include code blocks of the first set of code blocks which were unable to be successfully decoded at the UE 115-a.
  • the UE 115-a may transmit a feedback message 215 to the base station 105-a in response to the first transmission (e.g., in response to the first transmission including the first set of code blocks 210) .
  • the feedback message 215 may include an indication of the numerical quantity of code blocks of the first transmission which are associated with the NACK.
  • the feedback message 215 may include an indication of a numerical quantity of code blocks of the first set of code blocks 210 which were not successfully received and/or decoded at the UE 115-a.
  • the feedback message 215 may additionally or alternatively include an indication of which code blocks of the first set of code blocks 210 are associated with the NACK.
  • the feedback message 215 may include an indication of a numerical quantity of code block groups (CBGs) of the first transmission which are associated with a NACK.
  • CBGs code block groups
  • the code blocks of the first transmission may be transmitted in groups of two or more code blocks (e.g., each CBG includes two or more code blocks) .
  • one or more CBGs of the first transmission may be lost or otherwise associated with the NACK at the UE 115-a.
  • the feedback message 215 may include an indication of the numerical quantity of CBGs of the first transmission which are associated with the NACK.
  • the indication of a numerical quantity of code blocks which are associated with the NACK may be understood to refer to a numerical quantity of individual code blocks and/or a numerical quantity of CBGs, unless noted otherwise herein.
  • the second set of code blocks 210 may be based on the numerical quantity of code blocks of the first set of code blocks 210 which are associated with the NACK.
  • the numerical quantity of code blocks within the second set of code blocks 210 may be based on the numerical quantity of code blocks associated with the NACK indicated in the feedback message 215.
  • the second transmission may include a numerical quantity of code blocks within the second set of code blocks 210 which is greater than or equal to the numerical quantity of code blocks of the first set of code blocks 210 which are associated with the NACK, as indicated in the feedback message.
  • the set of code blocks within the second set of code blocks 210 may include retransmissions o the code blocks of the first set of code blocks 210 which are associated with the NACK.
  • Such techniques of the wireless communications system 200 may provide for efficient feedback signaling and techniques for systematic fountain coding procedures. More specifically, aspects described herein may significantly reduce the feedback overhead and/or retransmission overhead within the wireless communications system 200 as compared to other feedback schemes for fountain coding procedures.
  • FIG. 3 illustrates an example of an encoding scheme 300 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the encoding scheme 300 may implement aspects of wireless communications system 100 or 200.
  • the encoding scheme 300 may be associated with communications between wireless devices (e.g., IAB network nodes, UEs 115, base stations 105) of the wireless communications system 100 which are carried out according to a systematic fountain coding procedure, as described herein with reference to FIGs. 1–2. More specifically, the encoding scheme 300 may be utilized by the UE 115-a and/or the base station 105-a illustrated in FIG. 2 when encoding and/or decoding code blocks for transmission via the systematic fountain encoding procedure.
  • wireless devices e.g., IAB network nodes, UEs 115, base stations 105
  • the encoding scheme 300 may be utilized by the UE 115-a and/or the base station 105-a illustrated in FIG. 2 when encoding and/or decoding code
  • the encoding scheme 300 may use a Raptor coding procedure to encode code blocks (e.g., packets) for transmission.
  • a transmitting wireless device may encode a set of source code blocks 305 (e.g., a quantity K of source code blocks 305) into a set of encoding code blocks 325.
  • the quantity of encoding code blocks 325 may be greater than the quantity of source code blocks 305 to improve a probability of successfully decoding the source code blocks 305 at a receiving wireless device.
  • the encoding scheme 300 may be rateless, where the quantity of encoding code blocks 325 may have no upper limit.
  • the term “encoding code blocks 325” may be used interchangeably which “code blocks 325. ”
  • the term “code blocks” may be understood to be distinguishable from the terms “source code blocks” and “intermediate code blocks. ”
  • source code blocks, ” “intermediate code blocks, ” “encoding code blocks, ” and like terms may additionally or alternatively be understood to refer to “source symbols, ” “intermediate symbols, ” and “encoding symbols” may be used interchangeably.
  • symbols and code blocks may be understood to refer to some given quantity or packet of data which is to be encoded and decoded via fountain encoding/decoding procedures or processes.
  • source code blocks, ” “source symbols, ” “intermediate code blocks, ” “intermediate symbols, ” “encoding code blocks, ” “encoding symbols, ” and like terms may should be understood to be distinguishable from “OFDM symbols, ” and like terms.
  • symbol or code block used herein refers to some given quantity or packet of data to be encoded/decoded via fountain coding procedures, rather than a time/frequency resource of a multiplexing or modulation technique.
  • the code blocks described herein may be examples of code blocks as defined by 3GPP standards.
  • the encoding scheme 300 may include a precoding process 310.
  • the transmitting wireless device may map one or more source code blocks 305 to each of a set of intermediate code blocks 315.
  • the transmitting wireless device may generate a quantity of redundant intermediate code blocks 315 (e.g., a quantity of intermediate code blocks 315 in addition to a quantity K of intermediate code blocks 315 directly mapped to the K source code blocks 305) .
  • the redundant intermediate code blocks 315 may include a quantity S of low-density parity-check (LDPC) code blocks, where one or more copies (e.g., three copies) of each source code block 305 may appear in each LDPC code block.
  • LDPC low-density parity-check
  • the redundant intermediate code blocks 315 may include a quantity H of half code blocks, where each half may include ceil (H/2) source code blocks 305, and where ceil (x) may represent a ceiling function mapping x to a least integer greater than or equal to x.
  • the encoding scheme 300 may include an LT coding process 320 following the precoding process 310.
  • the transmitting wireless device may map the intermediate code blocks 315 to the set of encoding code blocks 325.
  • the LT coding process 320 may employ a degree distribution ⁇ , where the degree distribution ⁇ represents a probability mass function of a set of degrees d i (e.g., d 1 , d 2 , d 3 , etc. ) for the set of encoding code blocks 325.
  • a degree d i of the degree distribution ⁇ may define a degree of an i th encoding code block 325 such that the set of degrees (e.g., d 1 , d 2 , d 3 , etc. ) follow the degree distribution ⁇ .
  • the probability of randomly selecting a degree d i (i.e. a degree with index i) from the degree distribution may be represented by ⁇ (i) .
  • the degree d i may represent the quantity of intermediate code blocks 315 which the transmitting wireless device may combine into a given encoding code block 325.
  • each encoding code block 325 may include information identifying the source code blocks 305 used to construct the encoding code block 325.
  • the encoding code block may include indices (e.g., s 1 , s 2 , s 3 , s K , etc. ) associated with the source code blocks 305 used to construct the encoding code block 325.
  • indices e.g., s 1 , s 2 , s 3 , s K , etc.
  • the encoding scheme 300 illustrated in FIG. 3 may include a raptor coding scheme/procedure which is configured to generate the intermediate code blocks 315 from a number K source code blocks 305, such that the first K intermediate code blocks 315 are the same as the K source code blocks 305.
  • the encoding code blocks 325 may be transmitted as a set of encoding code blocks from the transmitting wireless device to the receiving wireless device. In some cases, the encoding code blocks 325 may be transmitted as a set of code blocks from the transmitting wireless device to the receiving wireless device via one or more wireless devices (e.g., intermediate nodes or intermediate wireless devices) of the wireless communications system 100 or 200. In some examples, the encoding scheme 300 may be represented by a generator matrix G.
  • the source code blocks 305 contained in encoding code blocks 325 of a given code block may be represented by p j , which may be defined by:
  • one or more code blocks, code block groups (CBGs) , or packets containing code blocks may be lost based on the transmission environment.
  • the receiving wireless device may receive a subset of code blocks 325 (e.g., a quantity N of encoding code blocks 325) via the wireless communications system.
  • the source code blocks 305 contained in encoding code blocks 325 received by the receiving wireless device may be represented by d k , which may be defined by:
  • G′ -1 defines the inverse matrix of matrix G′, and defines the n th row and the k th column of the matrix G′ -1 .
  • the receiving wireless device may recover all source code blocks 305 in the set of source code blocks 305 when the matrix G′ of the received code blocks is invertible. Additionally or alternatively, the receiving wireless device may recover all source code blocks 305 in the set of source code blocks 305 when the matrix G′ of the received code blocks 325 has a rank K, where K is the quantity of source code blocks 305 in the set of source code blocks 305.
  • the encoding scheme 300 may be designed such that the representative generator matrix G′ is invertible for a minimum quantity N of received encoding code blocks 325.
  • the receiving wireless device may decode the received encoding code blocks 325 to obtain the source code blocks 305.
  • the receiving wireless device may begin a decoding process by identifying an encoding code block 325 with an index t j that is connected to a single source code block 305 with an index s i .
  • the receiving wireless device may determine the encoding code block 325 with index t j is equivalent to the source code block 305 with index s i .
  • the receiving wireless device may then apply an XOR operation to each other encoding code block 325 connected to the source code block 305 with index s i , and remove all edges connected to the source code block 305 with index s i .
  • the receiving wireless device may repeat this process until each source code block 305 is determined from the received encoding code blocks 325.
  • the decoding process may fail if there is no encoding code block 325 connected to a single source code block 305. Accordingly, the degree distribution ⁇ of the encoding code blocks 325 received at the receiving wireless device may have a direct impact on the probability of successfully decoding source code blocks 305 transmitted in encoding code blocks 325.
  • the encoding scheme 300 described herein may enable wireless devices of a wireless communications system to improve efficiency and reliability of communications in the wireless communications system by increasing the probability of successfully decoding source code blocks 305 transmitted within encoding code blocks 325.
  • the fountain coding process e.g., encoding scheme 300
  • some feedback schemes for fountain coding procedures may suffer from extremely large feedback overhead and/or retransmission overhead.
  • the retransmission size e.g., transmitting wireless device re-transmits all code blocks including encoding code blocks 325) may be unnecessarily large, and exhibit high bandwidth consumption.
  • the feedback overhead may be extremely large.
  • retransmission overhead may be unnecessarily high when the CBG is large, and feedback overhead may be unnecessarily high when the CBG is small.
  • aspects disclosed herein are directed to wireless communications which enable efficient feedback signaling in the context of a systematic fountain coding processes.
  • FIG. 4 illustrates an example of a schematic diagram 400 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • schematic diagram 400 may implement aspects of wireless communications system 100 or 200, and encoding scheme 300. More particularly, schematic diagram 400 may further illustrate example techniques implemented via the encoding scheme 300.
  • the schematic diagram 400 may illustrate example techniques implemented by the UE 115-a and the base station 105-a of FIG. 2 when carrying out fountain coding/decoding procedures according to the encoding scheme 300.
  • the schematic diagram 400 illustrates some characteristics of the encoding scheme 300.
  • schematic diagram 400 illustrates a systematic fountain coding procedure which may be used to encode a set of source code blocks 405 into a set of encoding code blocks 425 which may be transmitted from a transmitting wireless device to a receiving wireless device.
  • a receiving wireless device which receives the encoding code blocks 425 may be configured to decode the encoding code blocks 425 in order to recover the source code blocks 405.
  • the schematic diagram 400 illustrated in FIG. 4 may include a systematic fountain coding scheme/procedure which is configured to generate the encoding code blocks 425 from a number K of source code blocks 405 such that the first K encoding code blocks 425 are the same as the K source code blocks.
  • he schematic diagram 400 is shown to include a precoding process 410 and an LT coding process 420.
  • a transmitting wireless device may map K source code blocks 405 to each of a set of intermediate code blocks 415.
  • the transmitting wireless device may generate a quantity of redundant intermediate code blocks (e.g., a quantity of intermediate code blocks in addition to a quantity K of intermediate code blocks 415 directly mapped to the K source code blocks 405) .
  • the redundant intermediate code blocks 315 may include a quantity S of LDPC code blocks, where one or more copies (e.g., three copies) of each source code block 405 may appear in each LDPC code block.
  • the redundant intermediate code blocks 415 may include a quantity H of half code blocks, where each half may include ceil (H/2) source code blocks 405, and where ceil (x) may represent a ceiling function mapping x to a least integer greater than or equal to x.
  • the transmitting wireless device may generate (K+S+H) intermediate code blocks 415 as the column vector C, where the first K rows in the column vector C represent the first K intermediate code blocks (e.g., K source code blocks 405) , the next S rows in the column vector C represent the S LDPC code blocks, and the last H rows in the column vector C represent the H half code blocks.
  • the transmitting wireless device may be configured to use the generator matrix G in order to encode the intermediate code blocks 415.
  • the schematic diagram 400 further illustrates an LT coding process 420 following the precoding process 410.
  • the transmitting wireless device may map the intermediate code blocks 415 to the set of encoding code blocks 425.
  • the LT coding process 420 may employ a degree distribution ⁇ , where the degree distribution ⁇ represents a probability mass function of a set of degrees d i (e.g., d 1 , d 2 , d 3 , etc. ) for the set of encoding code blocks 325.
  • a degree d i of the degree distribution ⁇ may define a degree of an i th encoding code block 325 such that the set of degrees (e.g., d 1 , d 2 , d 3 , etc. ) follow the degree distribution ⁇ .
  • a single intermediate code block 415 may be combined into the second encoding code block 425.
  • the set of K source code blocks 405 (and the set of intermediate code blocks 415) may be encoded into an effectively unlimited number of encoding code blocks 425.
  • each encoding code block 425 may include information identifying the source code blocks 405 used to construct the encoding code block 425.
  • the encoding code block may include indices (e.g., s 1 , s 2 , s 3 , s K , etc. ) associated with the source code blocks 405 used to construct the encoding code block 425.
  • a transmitting wireless device e.g., UE 115-a and/or base station 105-a illustrated in FIG.
  • the receiving wireless device may decode the encoding code blocks 425 to recover the K source code blocks 405.
  • the transmitting wireless device may define a (S+H+K) ⁇ 1 column vector D, where the first S+H rows in the column vector D are 0, and the next K rows in D represent the K source code blocks 405.
  • the transmitting wireless device may additionally define a matrix A based on a LDPC code block matrix G LDPC , a half symbols matrix G Half , and an LT matrix G LT .
  • the matrix A may further be based on one or more additional identity matrices or zero matrices.
  • the first K rows in the column vector C represent the first K intermediate code blocks
  • the next S rows in the column vector C represent the S LDPC code blocks
  • the last H rows in the column vector C represent the H half code blocks.
  • the transmitting wireless device may be configured to use the generator matrix G in order to encode the intermediate code blocks within the column vector C.
  • G LT defines the transpose of the generator matrix G (: , 1: K) , as defined above.
  • the coding scheme illustrated in FIG. 4 may include a systematic fountain coding scheme/procedure.
  • the precoding process 410 and the LT coding process 420 may be performed in such a manner as to generate the encoding code blocks 425 from the K source code blocks 405, such that the first K encoding code blocks 425 are the same as the K source code blocks 405.
  • the precoding process 410 may be configured to generate the intermediate code blocks 415 in such a manner as to generate the encoding code blocks 425 such that the first K encoding code blocks 425 are the same as the K source code blocks 405.
  • FIG. 5 illustrates an example of a schematic diagram 500 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • schematic diagram 500 may implement aspects of wireless communications system 100 or 200, encoding scheme 300, and schematic diagram 400.
  • schematic diagram 500 illustrates techniques for providing feedback between the UE 115-a and the base station 105-a illustrated in FIG. 2 in the context of systematic fountain coding procedures.
  • the transmitting wireless device may determine data which is to be transmitted via the systematic fountain coding procedure. For example, the transmitting wireless device may determine a transmission block (TB) including data which is to be transmitted via the systematic fountain coding procedure. The transmitting wireless device may add one or more cyclic redundancy check (CRC) bits to the TB. The transmitting wireless device may segment the TB into a set of source code blocks which will be included in the first transmission 505. The transmitting wireless device may additionally or alternatively add one or more CRC bits to each source code block of the first transmission 505. The source code blocks including the CRC bits may then be used for the fountain encoding procedures.
  • CRC cyclic redundancy check
  • a transmitting wireless device may encode a first set of encoding code blocks via a systematic fountain coding procedure.
  • a transmitting wireless device may encode a first set of encoding code blocks via a fountain coding procedure illustrated in FIGs. 3–4.
  • the transmitting wireless device may perform a first transmission 505 to a receiving wireless device, where the first transmission 505 includes one or more encoding code blocks of the first set of encoding code blocks.
  • the transmitting wireless device may perform a first transmission 505, where the first transmission 505 includes the first K encoding code blocks of the set of encoding code blocks.
  • the first transmission 505 may include the K source code blocks.
  • Each code block of the first transmission 505 may be transmitted according to a first redundancy version.
  • the receiving wireless device may not be required to decode the encoding code blocks of the first transmission 505.
  • the receiving wireless device may not be required to decode the first transmission since the source code blocks have already been received/recovered.
  • only a sub-set of the code blocks within the first transmission 505 may be successfully received at the receiving wireless device.
  • the receiving wireless device may determine whether any code blocks (or CBGs) of the first transmission 505 are associated with a NACK (e.g., determine code blocks which were not successfully received) .
  • the second and sixth encoding code blocks of the first transmission 505 may be associated with a NACK, whereas the first, third, fourth, and fifth code blocks may have been successfully received and/or decoded such that they are associated with a positive acknowledgement (e.g., ACK) .
  • ACK positive acknowledgement
  • the receiving wireless device may transmit a feedback message including an indication of a numerical quantity of code blocks (and/or a numerical quantity of CBGs) of the first transmission 505 which are associated with the NACK.
  • a receiving wireless device which receives the first transmission 505 illustrated in FIG. 5 may determine that the second code block (e.g., CB 2) and the sixth code block (e.g., CB 6) are associated with the NACK, and may thereby transmit a feedback message with an indication of “2, ” indicating that there are two code blocks of the first transmission 505 associated with the NACK.
  • the feedback message may include an indication of which code blocks of the first transmission 505 are associated with the NACK.
  • the feedback message may include an indication of the second code block (e.g., CB 2) and the sixth code block (e.g., CB 6) , thereby indicating that the second and sixth code blocks are associated with the NACK.
  • the transmitting wireless device may perform a second transmission 515 based on the feedback message. More specifically, in some cases, the transmitting wireless device may perform the second transmission 515 based on the indication of a numerical quantity of code blocks (or CBGs) of the first transmission 505 which are associated with a NACK. Additionally or alternatively, the transmitting wireless device may perform the second transmission 515 based on the indication of which code blocks of the first transmission 505 are associated with a NACK.
  • each code block of the second transmission 515 may be transmitted according to a second redundancy version.
  • the second transmission 515 may include a numerical quantity of code blocks (or a numerical quantity of CBGs) which is equal to the numerical quantity of code blocks of the first transmission 505 which are associated with the NACK.
  • the second transmission 515 may include two encoding code blocks (e.g., CB 7 and CB 8) , which is equivalent to the number of code blocks of the first transmission 505 which are associated with the NACK (e.g., CB 2 and CB 6) .
  • the second transmission 515 may include a numerical quantity of code blocks which is greater than the numerical quantity of code blocks of the first transmission 505 which are associated with the NACK.
  • the second transmission 515 may include three or more encoding code blocks.
  • the feedback techniques described herein may significantly reduce the feedback overhead and/or retransmission overhead associated with some other wireless communications systems implementing fountain coding procedures.
  • the feedback messages described herein may indicate a numerical quantity of code blocks. Accordingly, it has been found that the feedback overhead of the present disclosure may be reduced from 152 bits to 8 bits, thereby reducing network overhead and power consumption of the wireless devices.
  • techniques described herein may cause transmitting wireless devices to retransmit a numerical quantity of code blocks associated with the NACK. In many cases, this numerical quantity may be significantly lower than the total number of code blocks within a transmission, thereby significantly reducing retransmission overhead within the system.
  • Each encoding code block of the second transmission 515 may include one or more code blocks of the first transmission 505.
  • each code block of the second set of code blocks (e.g., each code block of the second transmission 515) may be based on a code block of the first set of code blocks (e.g., a code block of the first transmission 505) which is associated with the NACK and one or more additional code blocks of the first transmission 505.
  • each encoding code block of the second transmission 515 may include an indication of the one or more code blocks of the first transmission 505 which are included in each respective code block of the second transmission 515.
  • the first code block of the second transmission 515 may include the first code block (e.g., CB 1) , the second code block (e.g., CB 2) and the third code block (e.g., CB 3) of the first transmission 505.
  • CB 7 includes a code block of the first transmission 505 which was associated with the NACK (CB 2) , and two other code blocks of the first transmission 505 (CB 1 and CB 2) which were not associated with the NACK.
  • the first code block of the second transmission 515 (e.g., CB 7) may additionally or alternatively include an indication of CB 1, CB 2, and CB 3 of the first transmission 505.
  • the second code block of the second transmission 515 may include the fourth code block (e.g., CB 4) , the fifth code block (e.g., CB 5) and the sixth code block (e.g., CB 6) of the first transmission 505.
  • CB 8 includes a code block of the first transmission 505 which was associated with the NACK (CB 6) , and two other code blocks of the first transmission 505 (CB 4 and CB 5) which were not associated with the NACK.
  • the second code block of the second transmission 515 (e.g., CB 8) may additionally or alternatively include an indication of CB 4, CB 5, and CB 6 of the first transmission 505.
  • the code blocks of the first transmission 505 which make up (e.g., are included within) the code blocks of the second transmission 515 are provided solely for example, and are not to be regarded as limiting, unless noted otherwise herein.
  • the code blocks of the second transmission 515 may include any number and assortment of code blocks of the first transmission 505.
  • the first code block of the second transmission 515 e.g., CB 7
  • the first code block of the second transmission 515 (e.g., CB 7) may include CB 2, CB 3, and CB 5.
  • the receiving wireless device may be configured to encode code blocks of the first transmission 505 which were successfully received based on the second redundancy version. For example, the receiving wireless device may encode the first code block (e.g., CB 1) , the third code block (e.g., CB 3) , the fourth code block (e.g., CB 4) , and the fifth code block (e.g., CB 5) of the first transmission 505 based on the second redundancy version, as shown in FIG. 5.
  • the first code block e.g., CB 1
  • the third code block e.g., CB 3
  • the fourth code block e.g., CB 4
  • the fifth code block e.g., CB 5
  • the receiving wireless device may additionally or alternatively decode each encoding code block of the second transmission 515 which was associated with the NACK in the first transmission 515 (e.g., CB 2, CB 6) based on the one or more code blocks of the first transmission 505 which are not associated with the NACK.
  • the XOR operations performed in the “hard” decoding procedures may be performed according to
  • the decoding process may be completed. However, in some cases, CRC procedure and/or XOR operations may fail to decode the code blocks of the second transmission 515. In some aspects, the receiving wireless device may determine that the CRC procedures and/or XOR operations did not successfully decode the code blocks of the second transmission 515.
  • the receiving wireless device may decode the code blocks of the second transmission 515 via one or more soft combining procedures (e.g., soft decoding procedures) .
  • the receiving wireless device may perform a soft combining procedure on a code block of the second transmission 515 based on a code block of the first transmission 505 which is associated with the NACK and is transmitted via the first redundancy version, as well as the code block of the second transmission 515 which is associated with the NACK and is transmitted via the second redundancy version.
  • the first code block of the second transmission 515 (e.g., CB 7) includes CB 2, which was associated with the NACK in the first transmission 505.
  • the second code block of the second transmission 515 includes CB 6, which was associated with the NACK in the first transmission 505.
  • XOR operations performed in the “hard” decoding procedures may be performed according to Comparatively, XOR operations performed in the soft decoding procedures may be performed according to where L (x) is the log-likelihood ratio (LLR) of a binary random variable, defined as Subsequently, Z can be soft decoded based on L (z) .
  • L (x) is the log-likelihood ratio (LLR) of a binary random variable, defined as Subsequently, Z can be soft decoded based on L (z) .
  • the K original code blocks may be recovered with a probability P defined by:
  • FIG. 6 illustrates an example of a process flow 600 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • process flow 600 may implement aspects of wireless communications system 100 or 200, encoding scheme 300, and schematic diagram 400 or 500.
  • the process flow 600 may illustrate determining a receiving a first transmission including a first set of code blocks, transmitting a feedback message including an indication of a numerical quantity of code blocks associated with a NACK, and receiving a second transmission including a second set of code blocks based on the feedback message, as described with reference to FIGs. 1–5.
  • process flow 600 may include a UE 115-b and a base station 105-b which may be examples of corresponding devices as described herein.
  • the UE 115-b and the base station 105-b illustrated in FIG. 6 may be examples of the UE 115-a and the base station 105-a illustrated in FIG. 2.
  • process flow 600 may be performed by hardware (e.g., including circuitry, processing blocks, logic components, and other components) , code (e.g., software or firmware) executed by a processor, or any combination thereof.
  • code e.g., software or firmware
  • Alternative examples of the following may be implemented, where some steps are performed in a different order than described or are not performed at all. In some cases, steps may include additional features not mentioned below, or further steps may be added.
  • the operations in process flow 600 performed by UE 115-b and base station 105-b may be respectively performed by a UE 115, a base station 105, or another wireless device, and the example shown should not be construed as limiting.
  • the operations shown as performed by UE 115-b may be performed by a base station 105, and the operations shown as performed by base station 105-b may be performed by a UE 115.
  • the UE 115-b and the base station 105-b may each operate as a transmitting wireless device, a receiving wireless device, or both.
  • the base station 105-b may encode a transmission via a systematic fountain coding procedure.
  • the base station 105-b may encode a transmission including a set of code blocks via a systematic fountain coding procedure described herein with respect to FIGs. 2–5.
  • the base station 105-b may encode a first set of encoding code blocks via a fountain coding procedure illustrated in FIGs. 3–4.
  • the base station 105-b may map K source code blocks to a set of intermediate code blocks via a precoding process, and may map the set of intermediate code blocks to the set of encoding code blocks via an LT coding process.
  • the base station 105-b may transmit a control message to the UE 115-b, the control message including an indication of a redundancy version associated with the code blocks of the first transmission.
  • the base station 105-b may transmit a control message to the UE 115-a including an indication of the first redundancy version.
  • the control message may include any control message known in the art.
  • the base station 105-a may transmit DCI including an indication of the first redundancy version.
  • the base station 105-b may perform (e.g., transmit) the first transmission including the first set of encoding code blocks to the UE 115-b.
  • Each code block of the first transmission may be transmitted according to the first redundancy version.
  • the first transmission may be performed at 615 based on the control message including the indication of the first redundancy version at 610.
  • the encoding code blocks of first transmission may be the same as the K source code blocks.
  • the UE 115-b may determine one or more code blocks of the first set of code blocks of the first transmission which are associated with a NACK. For example, the UE 115-b may determine one or more code blocks of the first transmission which were not successfully received, and identify the one or more code blocks as being associated with a NACK. In some aspects, the UE 115-b may determine a numerical quantity of code blocks or CBGs of the first transmission which are associated with the NACK.
  • the UE 115-b may transmit a feedback message to the base station 105-b, the feedback message including an indication of the numerical quantity of code blocks (or CBGs) of the first transmission which are associated with the NACK. For example, in cases where the UE 115-b determines three code blocks of the first transmission were not successfully received, the UE 115-b may transmit the feedback message including an indication of “3. ”
  • the base station 105-b may transmit a control message to the UE 115-b, the control message including an indication of a redundancy version associated with code blocks of a second transmission.
  • the base station 105-b may transmit a control message to the UE 115-a including an indication of the second redundancy version.
  • the control message may include any configuration message known in the art including, but not limited to, DCI.
  • the base station 105-b may perform the second transmission based on the feedback message.
  • the base station 105-b may perform the second transmission based on the indication of a numerical quantity of code blocks (or CBGs) of the first transmission which are associated with a NACK. For example, in cases where the feedback message includes an indication of “3” indicating three code blocks of the first transmission were associated with the NACK, the base station 105-b may perform the second transmission including three or more code blocks.
  • the base station 105-b may perform the second transmission based on an indication of which code blocks of the first transmission are associated with a NACK.
  • each code block of the second transmission may be based on a code block of he first transmission which was associated with the NACK, and one or more additional code blocks of the first transmission.
  • the second transmission 515 may include CB 7 and CB 8, where CB 7 includes CB 1, CB 2, and CB 3, and CB 8 includes CB 4, CB 5, CB 6.
  • the second transmission may be performed at 635 based on the control message including the indication of the second redundancy version at 630.
  • the UE 115-b may encode the first set of code blocks of the first transmission based on the second redundancy version.
  • the UE 115-b may encode the first code block (e.g., CB 1) , the third code block (e.g., CB 3) , the fourth code block (e.g., CB 4) , and the fifth code block (e.g., CB 5) of the first transmission based on the second redundancy version.
  • the UE 115-b may decode the code blocks of the second transmission which were associated with the NACK in the first transmission. In some aspects, the UE 115-b may decode each encoding code block of the second transmission which was associated with the NACK in the first transmission based on the one or more additional code blocks of the first transmission which were not associated with the NACK.
  • the second transmission 515 may include CB 7 and CB 8.
  • CB 7 may include CB 1, CB 2, and CB 3, and CB 8 may include CB 4, CB 5, CB 6.
  • the UE 115-b may be configured to decode the code blocks of the second transmission which were associated with the NACK in the first transmission by performing one or more XOR operations.
  • the UE 115-b may determine one or more code blocks of the second set of code blocks of the second transmission which are associated with a NACK. For example, the UE 115-b may determine one or more code blocks of the second transmission which were not successfully received and/or successfully decoded, and identify the one or more code blocks as being associated with a NACK. In some aspects, the UE 115-b may determine a numerical quantity of code blocks or CBGs of the second transmission which are associated with the NACK.
  • the UE 115-b may transmit a feedback message to the base station 105-b, the feedback message including an indication of the numerical quantity of code blocks (or CBGs) of the second transmission which are associated with the NACK. For example, in cases where the UE 115-b determines two code blocks of the second transmission were not successfully received, the UE 115-b may transmit the feedback message including an indication of “2. ”
  • the base station 105-b may transmit a control message to the UE 115-b, the control message including an indication of a redundancy version associated with code blocks of a third transmission.
  • the base station 105-b may transmit a control message to the UE 115-a including an indication of the third redundancy version.
  • the control message may include any configuration message known in the art including, but not limited, to, DCI.
  • the base station 105-b may perform a third transmission based on the feedback message.
  • the base station 105-b may perform the third transmission based on the indication of a numerical quantity of code blocks (or CBGs) of the second transmission which are associated with a NACK.
  • the base station 105-b may perform the third transmission including two or more code blocks.
  • FIG. 7 shows a block diagram 700 of a device 705 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the device 705 may be an example of aspects of a UE 115 or base station 105 as described herein.
  • the device 705 may include a receiver 710, a communications manager 715, and a transmitter 720.
  • the device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • 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 feedback scheme for systematic raptor codes, etc. ) . Information may be passed on to other components of the device 705.
  • the receiver 710 may be an example of aspects of the transceiver 1020 or 1120 as described with reference to FIGs. 10 and 11.
  • the receiver 710 may utilize a single antenna or a set of antennas.
  • the communications manager 715 may receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version, receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version, and transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the communications manager 715 may also encode a first set of code blocks via a systematic fountain coding procedure, transmit, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version, transmit, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version, and receive, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the communications manager 715 may be an example of aspects of the communications manager 1010 or 1110 as described herein.
  • the actions performed by the communications manager 715 as described herein may be implemented to realize one or more potential advantages. For example, providing feedback and retransmissions based on an indication of a numerical quantity of code blocks may improve the efficiency and reliability of wireless communications.
  • the feedback techniques may alleviate network overhead by reducing feedback overhead and retransmission overhead in the context of systematic fountain coding procedures. Specifically, by providing feedback and retransmissions based on a numerical quantity of code blocks, rather than the identification of specific code blocks that were successfully received, the amount of feedback information sent to the transmitter is reduced, which lowers the signaling overhead associated with transmitting a set of code blocks to a receiver. This lower signaling overhead translates to lower power consumption, and better throughput.
  • a processor of a receiving wireless device e.g., base station 105, UE 115
  • a processor controlling the receiver 710, the communications manager 715, the transmitter 720, etc. may reduce processing resources used feedback signaling.
  • a processor of a transmitting wireless device e.g., base station 105, UE 115
  • a processor controlling the receiver 710, the communications manager 715, the transmitter 720, etc. may reduce processing resources used for feedback signaling by performing the subsequent transmissions of code blocks based on the indication of the numerical quantity of code blocks associated with a NACK.
  • the communications manager 715 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 715, or its sub-components may be executed by a general-purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • the communications manager 715 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the communications manager 715, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 715, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • Transmitter 720 may transmit signals generated by other components of the device 705.
  • the transmitter 720 may be collocated with a receiver 710 in a transceiver module.
  • the transmitter 720 may be an example of aspects of the transceiver 1020 or 1120 as described with reference to FIGs. 10 and 11.
  • the transmitter 720 may utilize a single antenna or a set of antennas.
  • FIG. 8 shows a block diagram 800 of a device 805 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the device 805 may be an example of aspects of a device 705, a UE 115, or a base station 105 as described herein.
  • the device 805 may include a receiver 810, a communications manager 815, and a transmitter 845.
  • the device 805 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • Receiver 810 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 feedback scheme for systematic raptor codes, etc. ) . Information may be passed on to other components of the device 805.
  • the receiver 810 may be an example of aspects of the transceiver 1020 or 1120 as described with reference to FIGs. 10 and 11.
  • the receiver 810 may utilize a single antenna or a set of antennas.
  • the actions performed by the communications manager 815 as described herein may additionally or alternatively be implemented in the context of a transmitting wireless device to realize one or more potential advantages. For example, performing subsequent transmissions (e.g., second transmission, third transmission) based on feedback including an indication of a numerical quantity of code blocks may improve the efficiency and reliability of wireless communications. In particular, the performing subsequent transmissions based on the numerical quantity of code blocks may alleviate network overhead by reducing retransmission overhead in the context of systematic fountain coding procedures.
  • the amount of data within the subsequent retransmissions may be reduced, which lowers the signaling overhead associated with transmitting a set of code blocks to a receiving wireless device. This lower signaling overhead translates to lower power consumption, and better throughput.
  • a processor of a transmitting wireless device e.g., base station 105, UE 115
  • a processor controlling the receiver 810, the communications manager 815, the transmitter 820, etc. may reduce processing resources used retransmission signaling.
  • a processor of a transmitting wireless device e.g., base station 105, UE 115
  • ) may reduce processing resources used for feedback signaling by performing the subsequent transmissions of code blocks based on the indication of the numerical quantity of code blocks associated with a NACK.
  • These feedback techniques may reduce the number and size of feedback messages and/or retransmissions for systematic fountain coding procedures, thereby reducing a number of times the processor ramps up processing power and turns on processing units to the transmissions.
  • the communications manager 815 may be an example of aspects of the communications manager 715 as described herein.
  • the communications manager 815 may include a code block receiving manager 820, a feedback generation manager 825, an encoding manager 830, a code block transmitting manager 835, and a feedback receiving manager 840.
  • the communications manager 815 may be an example of aspects of the communications manager 1010 or 1110 as described herein.
  • the code block receiving manager 820 may receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version and receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • the feedback generation manager 825 may transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the encoding manager 830 may encode a first set of code blocks via a systematic fountain coding procedure.
  • the code block transmitting manager 835 may transmit, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version and transmit, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version.
  • the feedback receiving manager 840 may receive, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • Transmitter 845 may transmit signals generated by other components of the device 805.
  • the transmitter 845 may be collocated with a receiver 810 in a transceiver module.
  • the transmitter 845 may be an example of aspects of the transceiver 1020 or 1120 as described with reference to FIGs. 10 and 11.
  • the transmitter 845 may utilize a single antenna or a set of antennas.
  • FIG. 9 shows a block diagram 900 of a communications manager 905 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the communications manager 905 may be an example of aspects of a communications manager 715, a communications manager 815, or a communications manager 1010 described herein.
  • the communications manager 905 may include a code block receiving manager 910, a feedback generation manager 915, a fountain coding manager 920, an encoding manager 925, a decoding manager 930, a control message receiving manager 935, a code block transmitting manager 940, a feedback receiving manager 945, a precoding manager 950, an intermediate code block manager 955, a redundant code block manager 960, a half-code block manager 965, and a control message transmitting manager 970. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the code block receiving manager 910 may receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version.
  • the code block receiving manager 910 may receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • the code block receiving manager 910 may receive a numerical quantity of code blocks of the second set of code blocks which is equal to the numerical quantity of code blocks of the first transmission associated with the NACK. In some examples, the code block receiving manager 910 may receive a numerical quantity of code blocks of the second set of code blocks which is greater than the numerical quantity of code blocks of the first transmission associated with the NACK. In some examples, the code block receiving manager 910 may receive, from the second wireless device, a third transmission based on the second feedback message, the third transmission including a third set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the third set of code blocks is received according to a third redundancy version different from the first redundancy version and the second redundancy version.
  • the feedback generation manager 915 may transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK. In some examples, the feedback generation manager 915 may transmit, to the second wireless device, a second feedback message including a numerical quantity of code blocks of the second transmission associated with a NACK.
  • the encoding manager 925 may encode a first set of code blocks via a systematic fountain coding procedure.
  • the systematic fountain coding procedure includes at least one of an LT coding procedure, a Raptor coding procedure, or both.
  • the encoding manager 925 may encode the one or more additional code blocks of the first set of code blocks based on the second redundancy version.
  • the code block transmitting manager 940 may transmit, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version.
  • the code block transmitting manager 940 may transmit, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version.
  • the code block transmitting manager 940 may perform the second transmission including a numerical quantity of code blocks of the second set of code blocks which is equal to the numerical quantity of code blocks of the first transmission associated with the NACK. In some examples, the code block transmitting manager 940 may perform the second transmission including a numerical quantity of code blocks of the second set of code blocks which is greater than the numerical quantity of code blocks of the first transmission associated with the NACK.
  • the code block transmitting manager 940 may transmit, to the second wireless device, a third transmission based on the second feedback message, the third transmission including a third set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the third set of code blocks is transmitted according to a third redundancy version different from the first redundancy version and the second redundancy version.
  • the feedback receiving manager 945 may receive, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK. In some examples, the feedback receiving manager 945 may receive, from the second wireless device, a second feedback message including a numerical quantity of code blocks of the second transmission associated with a NACK. In some cases, each code block of the second set of code blocks is based on a code block of the first set of code blocks which is associated with the NACK indicated in the first feedback message and one or more additional code blocks of the first set of code blocks. In some cases, each code block of the second set of code blocks is based on a code block of the first set of code blocks which is associated with the NACK indicated in the first feedback message and one or more additional code blocks of the first set of code blocks.
  • the decoding manager 930 may decode each code block of the second set of code blocks based on the code block of the first set of code blocks which is associated with the NACK and the encoding of the one or more additional code blocks of the first set of code blocks. In some examples, the decoding manager 930 may perform a CRC procedure on each code block of the second set of code blocks based on the code block of the first set of code blocks which is associated with the NACK and the one or more additional code blocks of the first set of code blocks. In some examples, the decoding manager 930 may decode at least one code block of the second set of code blocks via a soft combining procedure. In some examples, the decoding manager 930 may perform the soft combining procedure based on the at least one code block transmitted via the second redundancy version and the code block of the first set of code blocks which is associated with the NACK.
  • the control message transmitting manager 970 may transmit a configuration message including an indication of at least one of the first redundancy version or the second redundancy version.
  • the configuration message includes DCI.
  • the control message receiving manager 935 may receive a configuration message including an indication of at least one of the first redundancy version or the second redundancy version.
  • the precoding manager 950 may precode a set of source code blocks to generate a set of intermediate code blocks.
  • the redundant code block manager 960 may generate one or more redundant intermediate code blocks based on the set of source code blocks. In some examples, the redundant code block manager 960 may generate one or more LDPC code blocks. In some examples, the redundant code block manager 960 may generate the one or more LDPC code blocks such that three copies of each source code block of the set of source code blocks are included within the one or more LDPC code blocks.
  • the half-code block manager 965 may generate one or more half-code blocks. In some cases, the set of intermediate code blocks are mapped to the first set of code blocks based on an LT coding procedure, a Raptor coding procedure, or both.
  • the intermediate code block manager 955 may map the set of intermediate code blocks to the first set of code blocks based on a degree distribution.
  • FIG. 10 shows a diagram of a system 1000 including a device 1005 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the device 1005 may be an example of or include the components of device 705, device 805, a base station 105, or a UE 115 as described herein.
  • the device 1005 may be an example of a transmitting wireless device and/or a receiving wireless device, as described previously herein.
  • the device 1005 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a transceiver 1020, an antenna 1025, memory 1030, a processor 1040, and an I/O controller 1050.
  • the device 1005 may additionally or alternatively include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 1010, a network communications manager 1015, and an inter-station communications manager 1045. These components may be in electronic communication via one or more buses (e.g., bus 1055) .
  • buses e.g., bus 1055
  • Network communications manager 015 may manage communications with the core network (e.g., via one or more wired backhaul links) .
  • the network communications manager 015 may manage the transfer of data communications for client devices, such as one or more UEs 115.
  • the communications manager 1010 may receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version, receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version, and transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the communications manager 1010 may also encode a first set of code blocks via a systematic fountain coding procedure, transmit, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version, transmit, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version, and receive, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • Transceiver 1020 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1020 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1020 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 1025. However, in some cases the device may have more than one antenna 1025, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 1030 may include random-access memory (RAM) , read-only memory (ROM) , or a combination thereof.
  • the memory 1030 may store computer-readable code 1035 including instructions that, when executed by a processor (e.g., the processor 1040) cause the device to perform various functions described herein.
  • a processor e.g., the processor 1040
  • the memory 1030 may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • BIOS basic I/O system
  • the processor 1040 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a central processing unit (CPU) , a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 1040 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 1040.
  • the processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting feedback scheme for systematic raptor codes) .
  • the I/O controller 1050 may manage input and output signals for the device 1005.
  • the I/O controller 1050 may also manage peripherals not integrated into the device 1005.
  • the I/O controller 1050 may represent a physical connection or port to an external peripheral.
  • the I/O controller 1050 may utilize an operating system such as or another known operating system.
  • the I/O controller 1050 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 1050 may be implemented as part of a processor.
  • a user may interact with the device 1005 via the I/O controller 1050 or via hardware components controlled by the I/O controller 1050.
  • Inter-station communications manager 1045 may manage communications with other base station 105, and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communications manager 1045 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, inter-station communications manager 045 may provide an X2 interface within an LTE/LTE-A wireless communication network technology to provide communication between base stations 105.
  • the code 1035 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1035 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1035 may not be directly executable by the processor 1040 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIGs. 7–10 are shown and described as including components for both a receiving wireless device and a transmitting wireless device, which may be examples of a base station 105, a UE 115, an IAB node, and the like. However, it is noted herein that some devices may be configured to function only as a receiving wireless device, or only as a transmitting wireless device. Accordingly, in some cases, a device contemplated by the present disclosure may include only a sub-set of the various components shown and described in FIGs. 7–10. In this regard, the devices shown and described in FIGs. 7–10 are provided only for example.
  • FIG. 11 shows a flowchart illustrating a method 1100 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the operations of method 1100 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1100 may be performed by a communications manager as described with reference to FIGs. 7 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version.
  • the operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a feedback generation manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • the operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • FIG. 12 shows a flowchart illustrating a method 1200 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the operations of method 1200 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1200 may be performed by a communications manager as described with reference to FIGs. 7 through10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version.
  • the operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed by a feedback generation manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • the operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may encode the one or more additional code blocks of the first set of code blocks based on the second redundancy version.
  • the operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be performed by an encoding manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may decode each code block of the second set of code blocks which were associated with the NACK in the first transmission based on one or more additional code blocks of the first set of code blocks which were not associated with the NACK.
  • the operations of 1225 may be performed according to the methods described herein. In some examples, aspects of the operations of 1225 may be performed by a decoding manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may decode each code block of the second set of code blocks is based on a code block of the first set of code blocks which is associated with the NACK indicated in the first feedback message and one or more additional code blocks of the first set of code blocks.
  • the operations of 1230 may be performed according to the methods described herein. In some examples, aspects of the operations of 1230 may be performed by a fountain coding manager as described with reference to FIGs. 7 through 10.
  • FIG. 13 shows a flowchart illustrating a method 1300 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the operations of method 1300 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1300 may be performed by a communications manager as described with reference to FIGs. 7 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version.
  • the operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed by a feedback generation manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • the operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may transmit, to the second wireless device, a second feedback message including a numerical quantity of code blocks of the second transmission associated with a NACK.
  • the operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed by a feedback generation manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may receive, from the second wireless device, a third transmission based on the second feedback message, the third transmission including a third set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the third set of code blocks is received according to a third redundancy version different from the first redundancy version and the second redundancy version.
  • the operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • FIG. 14 shows a flowchart illustrating a method 1400 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the operations of method 1400 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1400 may be performed by a communications manager as described with reference to FIGs. 7 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive, from a second wireless device, a first transmission including a first set of code blocks encoded via a systematic fountain coding procedure, where each respective code block of the first set of code blocks is received according to a first redundancy version.
  • the operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may transmit, to the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed by a feedback generation manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may receive, from the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is received according to a second redundancy version different from the first redundancy version.
  • the operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed by a code block receiving manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may receive a configuration message including an indication of at least one of the first redundancy version or the second redundancy version.
  • the operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be performed by a configuration message receiver as described with reference to FIGs. 7 through 10.
  • FIG. 15 shows a flowchart illustrating a method 1500 that supports a feedback scheme for systematic raptor codes in accordance with aspects of the present disclosure.
  • the operations of method 1500 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1500 may be performed by a communications manager as described with reference to FIGs. 7 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may encode a first set of code blocks via a systematic fountain coding procedure.
  • the operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by an encoding manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may transmit, to a second wireless device, a first transmission including the first set of code blocks, where each respective code block of the first set of code blocks is transmitted according to a first redundancy version.
  • the operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by a code block transmitting manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may receive, from the second wireless device, a first feedback message including a numerical quantity of code blocks of the first transmission associated with a NACK.
  • the operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed by a feedback receiving manager as described with reference to FIGs. 7 through 10.
  • the UE or base station may transmit, to the second wireless device, a second transmission based on the first feedback message, the second transmission including a second set of code blocks encoded via the systematic fountain coding procedure, where each respective code block of the second set of code blocks is transmitted according to a second redundancy version different from the first redundancy version.
  • the operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed by a code block transmitting manager as described with reference to FIGs. 7 through 10.
  • LTE, LTE-A, LTE-A Pro, or NR 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.
  • the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
  • UMB Ultra Mobile Broadband
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer.
  • non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium.
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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Abstract

L'invention concerne des procédés, des systèmes et des dispositifs de communication sans fil. Un dispositif de transmission sans fil peut coder un premier ensemble de blocs de code au moyen d'une procédure de codage fontaine systématique. Le dispositif de transmission peut effectuer une première transmission comprenant le premier ensemble de blocs de code vers un dispositif de réception sans fil, le premier ensemble de blocs de code étant transmis selon une première version de redondance. Le dispositif de transmission sans fil peut recevoir un premier message de rétroaction du dispositif de réception sans fil, le premier message de rétroaction comprenant une quantité numérique de blocs de code de la première transmission qui sont associés à un accusé de réception négatif. Dans certains exemples, le dispositif de transmission sans fil peut effectuer une seconde transmission d'après le premier message de rétroaction, la seconde transmission comprenant un second ensemble de blocs de code codés au moyen de la procédure de codage fontaine, le second ensemble de blocs de code étant transmis selon une seconde version de redondance.
PCT/CN2020/088561 2020-05-02 2020-05-02 Schéma de rétroaction pour codes raptor systématiques WO2021223047A1 (fr)

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Cited By (1)

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US20230188250A1 (en) * 2021-12-09 2023-06-15 Qualcomm Incorporated Feedback for transport blocks with multiple modulation and coding schemes

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