WO2022051968A1 - Techniques d'indication d'état de ressource de rétroaction pour communications sans fil - Google Patents

Techniques d'indication d'état de ressource de rétroaction pour communications sans fil Download PDF

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Publication number
WO2022051968A1
WO2022051968A1 PCT/CN2020/114421 CN2020114421W WO2022051968A1 WO 2022051968 A1 WO2022051968 A1 WO 2022051968A1 CN 2020114421 W CN2020114421 W CN 2020114421W WO 2022051968 A1 WO2022051968 A1 WO 2022051968A1
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WO
WIPO (PCT)
Prior art keywords
feedback
base station
feedback processes
communications
processes
Prior art date
Application number
PCT/CN2020/114421
Other languages
English (en)
Inventor
Min Huang
Chao Wei
Qiaoyu Li
Jing Dai
Wei XI
Kangqi LIU
Rui Hu
Hao Xu
Wanshi Chen
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Qualcomm Incorporated
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Priority to PCT/CN2020/114421 priority Critical patent/WO2022051968A1/fr
Publication of WO2022051968A1 publication Critical patent/WO2022051968A1/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
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling

Definitions

  • the following relates to wireless communications, including feedback resource status indication techniques for wireless communications.
  • 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
  • Some wireless communications systems may support retransmissions of data transmissions based on feedback by a user equipment (UE) .
  • a UE may request a retransmission using a feedback process (e.g., a hybrid automatic repeat request (HARQ) process) in which a negative acknowledgment for a particular feedback process ID may indicate that the associated transmission was not successfully received and is to be retransmitted.
  • HARQ hybrid automatic repeat request
  • the feedback process may remain active until the associated transmission is successfully received.
  • a UE may be limited in the number of feedback processes that it may support at one particular time. Thus, when this capacity is reached, new transmissions may be deferred until one or more processes become available, which may result in communication inefficiencies.
  • a user equipment may determine a number of feedback processes (e.g., hybrid automatic repeat request (HARQ) processes) that are configurable at the UE, and provide an indication of the number of feedback processes to a base station.
  • the determined number of configurable feedback processes may be based on an amount of storage at the UE that is available for feedback processes, and an amount of storage used by existing feedback processes.
  • the indication of the number of feedback processes that are configurable at the UE may be provided in a HARQ storage status (HSS) report that is transmitted to the base station.
  • the UE may transmit a capability indication that indicates a number of feedback processes that the UE is capable of supporting. Such a capability indication may be transmitted in an initial access procedure, upon reconfiguration of transmission parameters at the UE, or any combinations thereof.
  • a method of wireless communication at a UE is described.
  • the method may include determining a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes, transmitting, to a base station, an indication of the number of feedback processes that are configurable at the UE, receiving, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes, and configuring the one or more feedback processes for communications with the base station based on the configuration information.
  • 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 determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes, transmit, to a base station, an indication of the number of feedback processes that are configurable at the UE, receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes, and configure the one or more feedback processes for communications with the base station based on the configuration information.
  • the apparatus may include means for determining a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes, transmitting, to a base station, an indication of the number of feedback processes that are configurable at the UE, receiving, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes, and configuring the one or more feedback processes for communications with the base station based on the configuration information.
  • a non-transitory computer-readable medium storing code for wireless communication at a UE is described.
  • the code may include instructions executable by a processor to determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes, transmit, to a base station, an indication of the number of feedback processes that are configurable at the UE, receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes, and configure the one or more feedback processes for communications with the base station based on the configuration information.
  • the transmitting may include operations, features, means, or instructions for transmitting, to the base station, a feedback storage status report that indicates the number of feedback processes that are configurable at the UE.
  • the number of feedback processes that are configurable at the UE are indicated as a total quantity of configurable feedback processes.
  • the number of feedback processes that are configurable at the UE are indicated as a proportion of a maximum number of available feedback processes.
  • the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • the feedback storage status report is transmitted to the base station based on a configured periodicity for providing feedback storage status. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the feedback storage status report is transmitted to the base station responsive to a trigger event. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the trigger event is based on one or more of the number of feedback processes configured at the UE reaching a threshold value, a percentage of consumed storage at the UE that is available for feedback processes reaching a threshold percentage, a reconfiguration of one or more communications parameters of the UE, or any combinations thereof.
  • the feedback storage status report is transmitted to the base station in a medium access control (MAC) control element, in RRC signaling, in uplink control information (UCI) , or any combinations thereof.
  • MAC medium access control
  • RRC Radio Resource Control
  • UCI uplink control information
  • 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 base station responsive to the feedback storage status report, additional configuration information for one or more additional feedback processes for communications with the base station.
  • the one or more additional feedback processes may have a transport block size that is set based on the feedback storage status report.
  • the transmitting may include operations, features, means, or instructions for transmitting UE capability information to the base station that indicates the number of feedback processes that are configurable at the UE.
  • the UE capability information is transmitted to the base station during an initial access procedure or responsive to a reconfiguration of UE communications parameters.
  • the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving reconfiguration information from the base station that indicates one or more reconfigured parameters for communications with the base station, and determining, based on the one or more reconfigured parameters, an updated number of feedback processes that are configurable at the UE.
  • the one or more reconfigured parameters include a bandwidth part used for communications with the base station, a modulation and coding scheme (MCS) table at the UE, a number of concurrent spatial division multiplexing (SDM) streams at the UE, or any combinations thereof.
  • MCS modulation and coding scheme
  • SDM spatial division multiplexing
  • the UE capability information is transmitted to the base station in a MAC control element, in RRC signaling, in UCI, or any combinations thereof.
  • the receiving further may include operations, features, means, or instructions for receiving configuration information for the number of feedback processes indicated in the UE capability information. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the receiving further may include operations, features, means, or instructions for receiving configuration information that includes one or more of a transport block size or a modulation and coding scheme for communications with the base station based on the number of feedback processes indicated in the UE capability information.
  • the number of feedback processes supported at the UE is determined based on one or more of the amount of storage available for feedback processes, a configured bandwidth for communications with the base station, a maximum code rate for communications with the base station, a number of concurrent spatial division multiplexing streams supported by the UE, or any combinations thereof.
  • the configuration information further indicates an updated maximum transport block size or smaller maximum code rate of a modulation and coding scheme.
  • the UE is a reduced capability UE that supports fewer feedback processes than a full-capability UE.
  • a method of wireless communication at a base station may include receiving, from a user equipment, an indication of a number of feedback processes that are configurable at the UE, configuring, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE, and transmitting, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • 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 user equipment, an indication of a number of feedback processes that are configurable at the UE, configure, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE, and transmit, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • the apparatus may include means for receiving, from a user equipment, an indication of a number of feedback processes that are configurable at the UE, configuring, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE, and transmitting, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • a non-transitory computer-readable medium storing code for wireless communication at a base station is described.
  • the code may include instructions executable by a processor to receive, from a user equipment, an indication of a number of feedback processes that are configurable at the UE, configure, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE, and transmit, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • the receiving may include operations, features, means, or instructions for receiving, from the UE, a feedback storage status report that indicates the number of feedback processes that are configurable at the UE.
  • the number of feedback processes that are configurable at the UE is indicated as a total quantity of configurable feedback processes.
  • the number of feedback processes that are configurable at the UE is indicated as a proportion of a maximum number of available feedback processes.
  • the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for configuring the UE with a periodicity for transmitting the feedback storage status report.
  • the feedback storage status report is transmitted by the UE responsive to a trigger event.
  • the trigger event is based on one or more of the number of feedback processes configured at the UE reaching a threshold value, a percentage of consumed storage at the UE that is available for feedback processes reaching a threshold percentage, a reconfiguration of one or more communications parameters of the UE, or any combinations thereof.
  • the feedback storage status report is received from the UE in a MAC control element, in RRC signaling, in UCI, or any combinations thereof.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on the feedback storage status report, that the UE can support one or more additional feedback processes, and transmitting, to the UE, additional configuration information for the one or more additional feedback processes for communications with the base station.
  • the one or more additional feedback processes may have a transport block size that is set based on the feedback storage status report.
  • the receiving may include operations, features, means, or instructions for receiving UE capability information that indicates the number of feedback processes that are configurable at the UE.
  • the UE capability information is received during an initial access procedure or responsive to a reconfiguration of UE communications parameters.
  • the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting reconfiguration information to the UE that indicates one or more reconfigured parameters for communications with the base station, and receiving, based on the one or more reconfigured parameters, updated UE capability information that indicates an updated number of feedback processes that are configurable at the UE.
  • the one or more reconfigured parameters include a bandwidth part used for communications with the base station, a MCS table at the UE, a number of concurrent SDM streams at the UE, or any combinations thereof.
  • the UE capability information is received in a MAC control element, in RRC signaling, in UCI, or any combinations thereof.
  • the transmitting further may include operations, features, means, or instructions for transmitting configuration information for the number of feedback processes indicated in the UE capability information. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the transmitting further may include operations, features, means, or instructions for transmitting configuration information that includes one or more of a transport block size or a modulation and coding scheme for communications with the base station based on the number of feedback processes indicated in the UE capability information.
  • the number of feedback processes supported at the UE is determined based on one or more of an amount of storage available for feedback processes, a configured bandwidth for communications with the base station, a maximum code rate for communications with the base station, a number of concurrent spatial division multiplexing streams supported by the UE, or any combinations thereof.
  • the configuring further may include operations, features, means, or instructions for configuring one or more of an updated maximum transport block size or smaller maximum code rate of a modulation and coding scheme to provide for one or more additional feedback processes that are supported at the UE.
  • the UE is a reduced capability UE that supports fewer feedback processes than a full-capability UE.
  • FIG. 1 illustrates an example of a system for wireless communications that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIG. 2 illustrates an example of a portion of a wireless communications system that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates an example of a multicast communications configuration that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIG. 4 illustrates an example of feedback storage resources that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIG. 5 illustrates an example of a process flow that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIGs. 6 and 7 show block diagrams of devices that support feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIG. 8 shows a block diagram of a communications manager that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIG. 9 shows a diagram of a system including a device that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIGs. 10 and 11 show block diagrams of devices that support feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIG. 12 shows a block diagram of a communications manager that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIG. 13 shows a diagram of a system including a device that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • FIGs. 14 through 19 show flowcharts illustrating methods that support feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • a transmitting device e.g., a base station or a user equipment (UE)
  • UE user equipment
  • a base station may provide a resource grant to a UE (e.g., in downlink control information (DCI) ) that indicates downlink resources that are to be monitored for a downlink communication to the UE and various transmission parameters (e.g., a modulation and coding scheme (MCS) , code rate, transport block size (TBS) , etc. ) .
  • DCI downlink control information
  • MCS modulation and coding scheme
  • TBS transport block size
  • the resource grant may also indicate a feedback process ID (e.g., a hybrid automatic repeat request (HARQ) process ID) associated with the downlink communication.
  • HARQ hybrid automatic repeat request
  • the UE may monitor the indicated resources and attempt to decode the downlink communication based on the received signals and transmission parameters. If the UE successfully decodes the communications, an acknowledgment (ACK) may be indicated to the base station for the associated feedback process ID, and otherwise the UE may indicate a negative acknowledgment (NACK) to the base station for the associated feedback process ID to trigger a retransmission of the communication.
  • ACK acknowledgment
  • NACK negative acknowledgment
  • the feedback process may remain active pending one or more retransmissions until the associated transmission is successfully received.
  • a UE may be limited in the number of feedback processes that it may support at one particular time. Thus, when this capacity is reached, the base station may defer new transmissions until one or more processes become available, which may result in increased latency for some communications. Further, in some deployments a base station may transmit multicast communications to multiple UEs, and in some cases the multicast communications may have associated feedback processes, which can limit a number of available feedback processes for unicast communications of a UE.
  • Such feedback process capacity limits may impact any type of UE, but can be more prevalent in certain types of devices, such as low cost devices that may have reduced capabilities.
  • reduced-capability (RedCap) UEs or NR-light UEs may be deployed that have lower cost and reduced capability.
  • reduced-capability UEs may have a reduced number of antennas, reduced transmit/receive bandwidth, limited battery capacity, reduced processing capability of physical downlink control channel (PDCCH) blind decoding, limited storage capacity, or any combinations thereof.
  • PDCCH physical downlink control channel
  • Such reduced-capability UEs may be used in, for example, Internet of things (IoT) use cases, such as smart wearable devices, industrial sensors, video surveillance devices, and the like.
  • IoT Internet of things
  • multiple types of UEs may be present, including regular UEs and reduced-capability UEs.
  • a UE may determine a number of feedback processes (e.g., HARQ processes) that are configurable at the UE, and provide an indication of the number of feedback processes to a base station.
  • the determined number of configurable feedback processes may be determined based on an amount of storage at the UE that is available for feedback processes, and an amount of storage used by existing feedback processes.
  • the indication of the number of feedback processes that are configurable at the UE may be provided in a HARQ storage status (HSS) report that is transmitted to the base station.
  • the UE may transmit a capability indication that indicates a number of feedback processes that the UE is capable of supporting. Such a capability indication may be transmitted in an initial access procedure, upon reconfiguration of transmission parameters at the UE, or any combinations thereof.
  • the described techniques may support improvements in the acknowledgment feedback process framework to allow efficient usage of UE storage for feedback processes and adjustment of a number of available feedback processes based on conditions at the UE. Such techniques may thereby decrease latency and improve reliability of wireless communications, among other advantages. As such, supported techniques may include improved network operations and, in some examples, may promote network efficiencies, among other benefits.
  • aspects of the disclosure are initially described in the context of wireless communications systems. Examples of feedback processes and storage are then described. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to feedback resource status indication techniques for wireless communications.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports feedback resource status indication techniques for wireless communications 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
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • a carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) and may be positioned according to a channel raster for discovery by the UEs 115.
  • E-UTRA evolved universal mobile telecommunication system terrestrial radio access
  • a carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology) .
  • the communication links 125 shown in the wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115.
  • Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
  • a carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100.
  • the carrier bandwidth may be one of a number of determined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) .
  • Devices of the wireless communications system 100 e.g., the base stations 105, the UEs 115, or both
  • the wireless communications system 100 may include base stations 105 or UEs 115 that support simultaneous communications via carriers associated with multiple carrier bandwidths.
  • each served UE 115 may be configured for operating over portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.
  • Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • 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.
  • One or more numerologies for a carrier may be supported, where a numerology may include a subcarrier spacing ( ⁇ ? ) and a cyclic prefix.
  • a carrier may be divided into one or more BWPs having the same or different numerologies.
  • a UE 115 may be configured with multiple BWPs.
  • a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.
  • 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.
  • Each base station 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof.
  • the term “cell” may refer to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) .
  • a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates.
  • Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105.
  • a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.
  • a 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.
  • Some UEs 115 may be low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication) .
  • M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention.
  • M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that makes use of the information or presents the information to humans interacting with the application program.
  • Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
  • Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) .
  • half-duplex communications may be performed at a reduced peak rate.
  • Other power conservation techniques for the UEs 115 include entering a power saving deep sleep mode when not engaging in active communications, operating over a limited bandwidth (e.g., according to narrowband communications) , or a combination of these techniques.
  • some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.
  • a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.
  • the wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof.
  • 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 D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115) .
  • vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these.
  • V2X vehicle-to-everything
  • V2V vehicle-to-vehicle
  • a vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system.
  • vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., base stations 105) using vehicle-to-network (V2N) communications, or with both.
  • V2N vehicle-to-network
  • 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 IP services 150 for one or more network operators.
  • the IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
  • Some of the network devices 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.
  • 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) .
  • 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.
  • one or more UEs 115 may provide information to a serving base station 105 that may indicate a number of feedback processes that may be configured at the UE 115. In some cases, the UE 115 may determine the number of configurable feedback processes based on an amount of storage at the UE 115 that is available for feedback processes, and an amount of storage used by existing feedback processes. In some cases, the indication of the number of feedback processes that are configurable at the UE 115 may be provided in a HARQ storage status (HSS) report that is transmitted to the base station 105. Additionally or alternatively, the UE 115 may transmit a capability indication that indicates a number of feedback processes that the UE 115 is capable of supporting. Such a capability indication may be transmitted in an initial access procedure, upon reconfiguration of transmission parameters, or any combinations thereof.
  • HSS HARQ storage status
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • wireless communications system 200 may implement aspects of wireless communications system 100.
  • Wireless communications system 200 may include a base station 105-a and a UE 115-awhich may be examples of a base station 105 and UEs 115, respectively, described with reference to FIG. 1.
  • the base station 105-a may transmit downlink communications to the UE 115-a via a downlink carrier 205 and the UE 115-a may transmit uplink communications to the base station 105-a via uplink carrier 210. While this example illustrates a single downlink carrier 205 and a single uplink carrier 210, in other cases the UE 115-a may be configured for with carrier aggregation and use multiple uplink or downlink carriers. Further, while various examples discussed herein reference communications with a single base station 105-a, techniques as discussed herein may be applied in cases where different base stations 105-a or multiple TRPs associated with a base station provide communications with the UE 115-a.
  • the base station 105-a may transmit HARQ process configuration information 215 to the UE 115-a.
  • Such HARQ process configuration information 215 may provide a number of HARQ processes that are to be configured (e.g., N HARQ ) .
  • the number of HARQ processes may be determined based on a HARQ process indication 220 that the UE 115-a transmits to the base station 105-a.
  • the HARQ process configuration information 215 may configure a number (N HARQ ) of PDSCH HARQ processes for a serving cell (e.g., an indication of 2, 4, 6, 10, 12, 16) , and the UE 115-a is expected to have sufficient storage for all the configured PDSCH HARQ processes.
  • These processes can be a unicast process or a multicast process (such as discussed with reference to FIG. 3) .
  • the consumed storage at the UE 115-a for a HARQ process depends on a number of factors, including the serving bandwidth part (BWP) bandwidth, a maximum code rate, and maximum special division multiplexing (SDM) streams.
  • BWP serving bandwidth part
  • SDM maximum special division multiplexing
  • data for each HARQ process may be stored in a circular buffer at the UE 115-a, and a circular buffer size (N cb ) associated with each process may be:
  • N cb min (N, N ref ) ,
  • N is the number of coded bits of a code block (CB)
  • TBS LBRM is the maximum transport block size based on the bandwidth of the serving BWP
  • C is the number of CBs
  • R LBRM is the minimum code rate for the circular buffer (e.g., 2/3 for NR) . If limited buffer rate matching (LBRM) is used, the total storage for all CBs is:
  • N RE max is the maximum number of REs in a slot
  • R msx is the maximum code rate
  • N stream max is maximum number of spatial-division multiplexed (SDM) data streams.
  • the devices are provided with storage that is sufficient for all potential configured PDSCH HARQ processes (e.g., for a maximum number of configured processes each having a maximum code rate, BWP bandwidth, and SDM streams) .
  • a reduced capability UE e.g., UE 115-a of FIG. 2
  • a reduced amount of storage may be available, thus limiting the maximum number of HARQ processes that may be configured.
  • the maximum number of HARQ processes may further be based on existing configured HARQ processes.
  • the code rate R or the number of REs N RE are often lower than the maximum value for a certain HARQ process, so storage allocated based on assumptions of maximum code rates and number of REs may not be fully used.
  • a reduced capability UE may be implemented with a limited storage, such as:
  • each HARQ process When each HARQ process is highly loaded (e.g., have a large packet size) , the limited storage can support at most processes. When some HARQ processes have lower loading (e.g., have a relatively small packet size) , there may be spare storage left after storing processes, so more HARQ processes can be supported.
  • the UE 115-a may provide an indication in the HARQ process indication 220 that spare PDSCH HARQ storage is available, which may allow the base station 105-a to schedule one or more new processes, which may help to enhance the UE 115-a throughput.
  • the UE 115-a may report a real-time PDSCH HARQ storage status (HSS) to the base station 105-a in the HARQ process indication 220.
  • HSS real-time PDSCH HARQ storage status
  • Such a HSS report may indicate, for example, how many PDSCH HARQ processes can be stored by the current spare PDSCH HARQ storage.
  • the number of HARQ processes may be provided as an absolute value (e.g., 0, 1/4, 1/2, 3/4, 1, 1+1/4, ..., ) or a proportion value (e.g., 0, 1/4, 1/2, 3/4, 1) relative to the total HARQ storage ( processes) .
  • this absolute value means the total number of unicast HARQ processes and multicast HARQ processes, or this proportion value means the spare storage that can be used for a new unicast or multicast HARQ processes.
  • the UE 115-a may transmit a periodic HSS report, and the base station 105-a may configure the periodicity of the report (e.g., cycle length, offset) . Based on the configured periodicity, the UE 115-a my transmit the HSS report accordingly.
  • the HSS report may be an aperiodic PDSCH HSS report that may be transmitted based on one or more triggering events. For example, a report may be triggered when the number of existing HARQ processes reaches a configured value or a percentage of
  • the HSS report may be transmitted to the base station 105-a using uplink signaling, such as in a medium access control (MAC) control element, in RRC signaling, in uplink control information (UCI) , or any combinations thereof.
  • uplink signaling such as in a medium access control (MAC) control element, in RRC signaling, in uplink control information (UCI) , or any combinations thereof.
  • the base station 105-a may determine whether a new PDSCH HARQ process can be configured for the UE 115-a.
  • the TBS for associated communications may be selected such that the new HARQ process does not consume more than the reported spare HARQ storage.
  • the UE 115-a may transmit an indication of capability on PDSCH HARQ storage in the HARQ process indication 220.
  • a UE 115-a capability may be indicated when the UE 115-a performs an initial access to the base station 105-a, when the base station 105-a reconfigures one or more transmission parameters, or combinations thereof.
  • the UE 115-a may report the number of supported HARQ processes to the base station 105-a. If the UE 115-a supports multicast transfer with HARQ function, this number may indicate the number of unicast HARQ processes and the number of multicast HARQ processes.
  • the UE 115-a may recalculate the consumed storage of each HARQ process based on the bandwidth of the new serving BWP, and then update the number of supported HARQ processes and report that number to the base station 105-a.
  • the base station 105-a may reconfigure a MCS table in which a highest modulation order is changed (e.g., from 64QAM to 256QAM) , and the UE 115-a may recalculate the consumed storage of each HARQ process based on the new highest modulation order, and then update the number of supported HARQ processes and report that number to the base station 105-a.
  • the base station 105-a may reconfigure the maximum number of SDM streams (e.g., from 1 to 2) , and the UE 115-a may recalculate the consumed storage of each HARQ process based on this new value, and then update the number of supported HARQ processes and report that number to the base station 105-a.
  • the indication of capability may be transmitted to the base station 105-a via RRC signaling, a MAC control element, UCI, or combinations thereof. After receiving this capability indication, the base station 105-a may transmit a message to the UE 115-a to configure the number of PDSCH HARQ processes in the serving cell.
  • the base station 105-a may transmit a message to the UE 115-a to configure a smaller maximum TBS or a smaller maximum MCS (e.g., to change a highest modulation order in a MCS table from 256QAM to 64QAM) .
  • a smaller maximum TBS or a smaller maximum MCS e.g., to change a highest modulation order in a MCS table from 256QAM to 64QAM
  • Such techniques may provide the base station 105-a and the UE 115-a with flexibility to utilize the limited PDSCH HARQ storage (e.g., in reduced capability UEs) , in order to enable the UE 115-a to support a larger number of HARQ processes, and may allow the base station 105-a to schedule new HARQ processes when the number of existing low-load HARQ processes reaches the configured value.
  • PDSCH HARQ storage e.g., in reduced capability UEs
  • Such techniques makes the network and UE more adaptive with different types of data traffic (e.g., traffic that has small or large size data packets) and thus increases PDSCH throughput for unicast and multicast communications.
  • FIG. 3 illustrates an example of a multicast communications configuration 300 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • multicast communications configuration 300 may implement aspects of wireless communications system 100 or 200.
  • a UE may report information related to HARQ processes that may be configured at the UE. Such HARQ processes may be associated with unicast or multicast communications.
  • a UE may be scheduled with multiple multicast sessions, including a first multicast session 305 that is allocated with associated on-duration resources 320, a second multicast session 310 that is allocated with associated on-duration resources 325, and a third multicast session 315 that is allocated with associated on-duration resources 330.
  • communications on each of the multicast sessions 305-315 may use associated HARQ processes.
  • a UE may provide a HSS report or HARQ process capability indication to the base station that is based at least in part on the HARQ processes associated with the multicast sessions 305-315.
  • the base station may configure one or more additional HARQ processes for the UE, may adjust one or more downlink communications with the UE such that associated HARQ processes use less storage, or combinations thereof.
  • the base station may have some scheduling and configuration flexibility based on current and expected communications with the UE.
  • FIG. 4 illustrates an example of a feedback storage resources 400 that support feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • feedback storage resources 400 may implement aspects of wireless communications system 100 or 200.
  • a UE e.g., a UE 115 as discussed herein
  • HARQ processes may use the available HARQ storage 410 as a circular buffer for received data HARQ processing.
  • the UE may be configured with a first set of processes 405.
  • each of the processes 405 may have a relatively high load (e.g., large code rate, multiple SDM streams, large BWP bandwidth, etc. ) , such that HARQ process storage usage 415 fully utilizes or nearly fully utilizes the available HARQ storage 410-a at the UE.
  • the UE may not have sufficient spare storage to support any additional HARQ processes.
  • the report may indicate that the storage associated with HARQ processes is completely utilized or nearly completely utilized.
  • the capability may indicate that no additional HARQ processes can be configured (e.g., a same value of processes may be provided as are already configured at the UE) .
  • the HSS report or UE capability indication may indicate fractional HARQ processes that may be supported, which may indicate to the base station that additional HARQ processes may be added if they are loaded such that only a fractional portion of the maximum storage for a HARQ process would be used.
  • the UE may again be configured with a second set of processes 420.
  • each of the processes 420 in this example may have a relatively low load (e.g., low code rate, single SDM stream, small BWP bandwidth, etc. ) , such that HARQ process storage usage 415 is relatively low and the available HARQ storage 410-b may be available for additional HARQ processes.
  • the UE may have spare storage 425 that is sufficient for one or more new HARQ processes.
  • the report may indicate that the storage associated with HARQ processes is not fully utilized and can support one or more additional HARQ processes.
  • the capability may indicate that a larger number of HARQ processes can be configured than are currently configured at the UE.
  • the HSS report or UE capability indication may indicate fractional HARQ processes that may be supported, which may indicate to the base station that additional HARQ processes may be added if they are loaded such that only a fractional portion of the maximum storage for a HARQ process would be used.
  • FIG. 5 illustrates an example of a process flow 500 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • process flow 500 may implement aspects of wireless communications system 100 or 200.
  • Process flow 500 may be implemented by a UE 115-b and a base station 105-b, which may be examples of UEs and base stations as described herein.
  • 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 UE 115-b may optionally transmit a UE capability indication to the base station 105-b.
  • the UE capability indication may provide, among other things, a number of HARQ processes that are configurable at the UE 115-b.
  • the UE 115-b may determine the number of HARQ processes that are configurable based on one or more parameters associated with currently configured HARQ processes and currently configured communications. For example, the UE 115-b may be configured for communications that have a particular maximum code rate, number of SDM streams, and BWP bandwidth that may be used, along with available HARQ process storage at the UE 115-b, to determine a number of configurable HARQ processes.
  • the UE capability indication may be provided on initial access, in which case the number of HARQ processes reported by the UE 115-b may be based on maximum values of the various transmission parameters. In other cases, the UE capability indication may be provided in response to a reconfiguration of one or more parameters.
  • the UE capability indication may be transmitted in a MAC-CE, UCI, RRC signaling, or any combinations thereof.
  • the base station 105-b may transmit a HARQ process configuration to the UE 115-b.
  • the HARQ process configuration may configure the number of HARQ processes to be used for communications with the UE. In some cases, the number of HARQ processes may be based on the reported UE capability.
  • the HARQ process configuration may be transmitted in control signaling, such as DCI, RRC signaling, in a MAC-CE, or any combinations thereof.
  • the UE 115-b may determine a number of additional HARQ processes that may be configured at the UE 115-b. Such a determination may be made according to techniques as discussed herein, in which the UE 115-b determines an amount of available HARQ storage based on currently configured communications parameters (e.g., number of SDM streams, bandwidth, code rate, etc., of currently configured PDSCHs) .
  • the UE 115-b may transmit a HSS storage status report to the base station 105-b.
  • the HSS report may indicate, for example, a relative number of HARQ processes compared to a currently configured number of HARQ processes, or an absolute value of a number of configurable HARQ processes.
  • the number of HARQ processes may be reported as a fractional value of HARQ processes, which the base station 105-b may use to determine communications parameters for transmissions that may use a new HARQ process.
  • the base station 105-b may determine additional HARQ processes that can be configured at the UE 115-b. In some cases, the base station 105-b may determine the additional HARQ processes based on currently configured communications parameters (e.g., SDM streams, code rate, bandwidth, etc., of currently configured PDSCHs) . In other cases, the base station 105-b may reconfigure one or more configuration parameters to allow for one or more additional HARQ processes to be configured at the UE 115-b. At 530, the base station 105-b may transmit parameters to the UE 115-b for one or more additional HARQ processes.
  • currently configured communications parameters e.g., SDM streams, code rate, bandwidth, etc., of currently configured PDSCHs
  • the base station 105-b may reconfigure one or more configuration parameters to allow for one or more additional HARQ processes to be configured at the UE 115-b.
  • the base station 105-b may transmit parameters to the UE 115-b for one or more additional
  • the UE 115-b may configure the one or more additional HARQ processes based at least in part on the parameters received from the base station 105-b.
  • the base station 105-b may transmit downlink communications to the UE (e.g., PDSCH communications) .
  • the UE 115-b may receive the communications and perform HARQ operations in accordance with the configured HARQ processes.
  • the UE 115-b may transmit HARQ feedback to the base station 105-b, which in the case of NACK feedback may trigger one or more retransmissions from the base station 105-b.
  • FIG. 6 shows a block diagram 600 of a device 605 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the device 605 may be an example of aspects of a UE 115 as described herein.
  • the device 605 may include a receiver 610, a communications manager 615, and a transmitter 620.
  • the device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to feedback resource status indication techniques for wireless communications, etc. ) . Information may be passed on to other components of the device 605.
  • the receiver 610 may be an example of aspects of the transceiver 920 described with reference to FIG. 9.
  • the receiver 610 may utilize a single antenna or a set of antennas.
  • the communications manager 615 may determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes, transmit, to a base station, an indication of the number of feedback processes that are configurable at the UE, receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes, and configure the one or more feedback processes for communications with the base station based on the configuration information.
  • the communications manager 615 may be an example of aspects of the communications manager 910 described herein.
  • the communications manager 615 as described herein may be implemented to realize one or more potential advantages.
  • One implementation may allow the device 605 to configure feedback processes based on an amount of storage and other configured feedback processes, which may allow for additional feedback processes.
  • Such operations may provide improvements to reliability, latency, and efficiency in wireless communications.
  • improvements may enhance efficiency of wireless communications at a UE by allowing for configuration of HARQ processes that is adaptive to UE conditions and available storage.
  • supported techniques may include improved network and UE operations and, in some examples, may promote network efficiencies, reduce latency, and provide network scheduling flexibility, among other benefits.
  • the communications manager 615 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 615, or its sub-components may be executed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC) , a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • code e.g., software or firmware
  • ASIC application-specific integrated circuit
  • the communications manager 615 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 615, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 615, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 620 may transmit signals generated by other components of the device 605.
  • the transmitter 620 may be collocated with a receiver 610 in a transceiver module.
  • the transmitter 620 may be an example of aspects of the transceiver 920 described with reference to FIG. 9.
  • the transmitter 620 may utilize a single antenna or a set of antennas.
  • FIG. 7 shows a block diagram 700 of a device 705 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the device 705 may be an example of aspects of a device 605, or a UE 115 as described herein.
  • the device 705 may include a receiver 710, a communications manager 715, and a transmitter 740.
  • the device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to feedback resource status indication techniques for wireless communications, etc. ) . Information may be passed on to other components of the device 705.
  • the receiver 710 may be an example of aspects of the transceiver 920 described with reference to FIG. 9.
  • the receiver 710 may utilize a single antenna or a set of antennas.
  • the communications manager 715 may be an example of aspects of the communications manager 615 as described herein.
  • the communications manager 715 may include a feedback storage manager 720, a feedback status manager 725, a configuration manager 730, and a feedback process manager 735.
  • the communications manager 715 may be an example of aspects of the communications manager 910 described herein.
  • the feedback storage manager 720 may determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes.
  • the feedback status manager 725 may transmit, to a base station, an indication of the number of feedback processes that are configurable at the UE.
  • the configuration manager 730 may receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes.
  • the feedback process manager 735 may configure the one or more feedback processes for communications with the base station based on the configuration information.
  • the transmitter 740 may transmit signals generated by other components of the device 705.
  • the transmitter 740 may be collocated with a receiver 710 in a transceiver module.
  • the transmitter 740 may be an example of aspects of the transceiver 920 described with reference to FIG. 9.
  • the transmitter 740 may utilize a single antenna or a set of antennas.
  • FIG. 8 shows a block diagram 800 of a communications manager 805 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the communications manager 805 may be an example of aspects of a communications manager 615, a communications manager 715, or a communications manager 910 described herein.
  • the communications manager 805 may include a feedback storage manager 810, a feedback status manager 815, a configuration manager 820, a feedback process manager 825, and a capability manager 830. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the feedback storage manager 810 may determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes. In some cases, the number of feedback processes supported at the UE is determined based on one or more of the amount of storage available for feedback processes, a configured bandwidth for communications with the base station, a maximum code rate for communications with the base station, a number of concurrent spatial division multiplexing streams supported by the UE, or any combinations thereof.
  • the feedback status manager 815 may transmit, to a base station, an indication of the number of feedback processes that are configurable at the UE. In some examples, the feedback status manager 815 may transmit, to the base station, a feedback storage status report that indicates the number of feedback processes that are configurable at the UE.
  • the number of feedback processes that are configurable at the UE is indicated as a total quantity of configurable feedback processes. In some cases, the number of feedback processes that are configurable at the UE is indicated as a proportion of a maximum number of available feedback processes. In some cases, the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • the feedback storage status report is transmitted to the base station based on a configured periodicity for providing feedback storage status. In some cases, the feedback storage status report is transmitted to the base station responsive to a trigger event. In some cases, the trigger event is based on one or more of the number of feedback processes configured at the UE reaching a threshold value, a percentage of consumed storage at the UE that is available for feedback processes reaching a threshold percentage, a reconfiguration of one or more communications parameters of the UE, or any combinations thereof. In some cases, the feedback storage status report is transmitted to the base station in a medium access control (MAC) control element, in RRC signaling, in uplink control information (UCI) , or any combinations thereof.
  • MAC medium access control
  • the configuration manager 820 may receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes. In some examples, the configuration manager 820 may receive, from the base station responsive to the feedback storage status report, additional configuration information for one or more additional feedback processes for communications with the base station.
  • the configuration manager 820 may receive reconfiguration information from the base station that indicates one or more reconfigured parameters for communications with the base station. In some examples, the configuration manager 820 may determine, based on the one or more reconfigured parameters, an updated number of feedback processes that are configurable at the UE.
  • the configuration manager 820 may receive configuration information for the number of feedback processes indicated in the UE capability information. In some examples, the configuration manager 820 may receive configuration information that includes one or more of a transport block size or a modulation and coding scheme for communications with the base station based on the number of feedback processes indicated in the UE capability information. In some cases, the one or more additional feedback processes have a transport block size that is set based on the feedback storage status report. In some cases, the one or more reconfigured parameters include a bandwidth part used for communications with the base station, a modulation and coding scheme (MCS) table at the UE, a number of concurrent spatial division multiplexing (SDM) streams at the UE, or any combinations thereof.
  • MCS modulation and coding scheme
  • SDM spatial division multiplexing
  • the feedback process manager 825 may configure the one or more feedback processes for communications with the base station based on the configuration information.
  • the capability manager 830 may transmit UE capability information to the base station that indicates the number of feedback processes that are configurable at the UE.
  • the UE capability information is transmitted to the base station during an initial access procedure or responsive to a reconfiguration of UE communications parameters.
  • the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • the UE capability information is transmitted to the base station in a medium access control (MAC) control element, in RRC signaling, in uplink control information (UCI) , or any combinations thereof.
  • the UE is a reduced capability UE that supports fewer feedback processes than a full-capability UE.
  • FIG. 9 shows a diagram of a system 900 including a device 905 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the device 905 may be an example of or include the components of device 605, device 705, or a UE 115 as described herein.
  • the device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 910, an I/O controller 915, a transceiver 920, an antenna 925, memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., bus 945) .
  • buses e.g., bus 945
  • the communications manager 910 may determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes, transmit, to a base station, an indication of the number of feedback processes that are configurable at the UE, receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes, and configure the one or more feedback processes for communications with the base station based on the configuration information.
  • the communications manager 910 as described herein may be implemented to realize one or more potential advantages.
  • One implementation may allow the device 905 to configure feedback processes based on an amount of storage and other configured feedback processes, which may allow for additional feedback processes.
  • Such operations may provide improvements to reliability, latency, and efficiency in wireless communications.
  • improvements may enhance efficiency of wireless communications at a UE by allowing for configuration of HARQ processes that is adaptive to UE conditions and available storage.
  • supported techniques may include improved network and UE operations and, in some examples, may promote network efficiencies, reduce latency, and provide network scheduling flexibility, among other benefits.
  • the I/O controller 915 may manage input and output signals for the device 905.
  • the I/O controller 915 may also manage peripherals not integrated into the device 905.
  • the I/O controller 915 may represent a physical connection or port to an external peripheral.
  • the I/O controller 915 may utilize an operating system such as or another known operating system.
  • the I/O controller 915 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 915 may be implemented as part of a processor.
  • a user may interact with the device 905 via the I/O controller 915 or via hardware components controlled by the I/O controller 915.
  • the transceiver 920 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 920 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 920 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 925. However, in some cases the device may have more than one antenna 925, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 930 may include RAM and ROM.
  • the memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 930 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 940 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 940 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 940.
  • the processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting feedback resource status indication techniques for wireless communications) .
  • the code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 935 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 935 may not be directly executable by the processor 940 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 10 shows a block diagram 1000 of a device 1005 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the device 1005 may be an example of aspects of a base station 105 as described herein.
  • the device 1005 may include a receiver 1010, a communications manager 1015, and a transmitter 1020.
  • the device 1005 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to feedback resource status indication techniques for wireless communications, etc. ) . Information may be passed on to other components of the device 1005.
  • the receiver 1010 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13.
  • the receiver 1010 may utilize a single antenna or a set of antennas.
  • the communications manager 1015 may receive, from a user equipment, an indication of a number of feedback processes that are configurable at the UE, configure, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE, and transmit, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • the communications manager 1015 may be an example of aspects of the communications manager 1310 described herein.
  • the communications manager 1015 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 1015, or its sub-components may be executed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC) , a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • code e.g., software or firmware
  • ASIC application-specific integrated circuit
  • the communications manager 1015 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 1015, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 1015, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 1020 may transmit signals generated by other components of the device 1005.
  • the transmitter 1020 may be collocated with a receiver 1010 in a transceiver module.
  • the transmitter 1020 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13.
  • the transmitter 1020 may utilize a single antenna or a set of antennas.
  • FIG. 11 shows a block diagram 1100 of a device 1105 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the device 1105 may be an example of aspects of a device 1005, or a base station 105 as described herein.
  • the device 1105 may include a receiver 1110, a communications manager 1115, and a transmitter 1135.
  • the device 1105 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to feedback resource status indication techniques for wireless communications, etc. ) . Information may be passed on to other components of the device 1105.
  • the receiver 1110 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13.
  • the receiver 1110 may utilize a single antenna or a set of antennas.
  • the communications manager 1115 may be an example of aspects of the communications manager 1015 as described herein.
  • the communications manager 1115 may include a feedback status manager 1120, a configuration manager 1125, and a feedback process manager 1130.
  • the communications manager 1115 may be an example of aspects of the communications manager 1310 described herein.
  • the feedback status manager 1120 may receive, from a user equipment, an indication of a number of feedback processes that are configurable at the UE.
  • the configuration manager 1125 may configure, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE.
  • the feedback process manager 1130 may transmit, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • the transmitter 1135 may transmit signals generated by other components of the device 1105.
  • the transmitter 1135 may be collocated with a receiver 1110 in a transceiver module.
  • the transmitter 1135 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13.
  • the transmitter 1135 may utilize a single antenna or a set of antennas.
  • FIG. 12 shows a block diagram 1200 of a communications manager 1205 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the communications manager 1205 may be an example of aspects of a communications manager 1015, a communications manager 1115, or a communications manager 1310 described herein.
  • the communications manager 1205 may include a feedback status manager 1210, a configuration manager 1215, a feedback process manager 1220, and a capability manager 1225. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the feedback status manager 1210 may receive, from a user equipment, an indication of a number of feedback processes that are configurable at the UE. In some examples, the feedback status manager 1210 may receive, from the UE, a feedback storage status report that indicates the number of feedback processes that are configurable at the UE. In some cases, the number of feedback processes that are configurable at the UE is indicated as a total quantity of configurable feedback processes. In some cases, the number of feedback processes that are configurable at the UE is indicated as a proportion of a maximum number of available feedback processes. In some cases, the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • the feedback storage status report is transmitted by the UE responsive to a trigger event.
  • the trigger event is based on one or more of the number of feedback processes configured at the UE reaching a threshold value, a percentage of consumed storage at the UE that is available for feedback processes reaching a threshold percentage, a reconfiguration of one or more communications parameters of the UE, or any combinations thereof.
  • the feedback storage status report is received from the UE in a medium access control (MAC) control element, in RRC signaling, in uplink control information (UCI) , or any combinations thereof.
  • MAC medium access control
  • the configuration manager 1215 may configure, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE. In some examples, the configuration manager 1215 may configure the UE with a periodicity for transmitting the feedback storage status report. In some examples, the configuration manager 1215 may transmit reconfiguration information to the UE that indicates one or more reconfigured parameters for communications with the base station. In some examples, the configuration manager 1215 may receive, based on the one or more reconfigured parameters, updated UE capability information that indicates an updated number of feedback processes that are configurable at the UE.
  • the configuration manager 1215 may transmit configuration information for the number of feedback processes indicated in the UE capability information. In some examples, the configuration manager 1215 may transmit configuration information that includes one or more of a transport block size or a modulation and coding scheme for communications with the base station based on the number of feedback processes indicated in the UE capability information. In some cases, the one or more reconfigured parameters include a bandwidth part used for communications with the base station, a modulation and coding scheme (MCS) table at the UE, a number of concurrent spatial division multiplexing (SDM) streams at the UE, or any combinations thereof.
  • MCS modulation and coding scheme
  • SDM spatial division multiplexing
  • the feedback process manager 1220 may transmit, to the UE, configuration information for the one or more feedback processes for communications with the base station. In some examples, the feedback process manager 1220 may determine, based on the feedback storage status report, that the UE can support one or more additional feedback processes. In some examples, the feedback process manager 1220 may transmit, to the UE, additional configuration information for the one or more additional feedback processes for communications with the base station. In some cases, the one or more additional feedback processes have a transport block size that is set based on the feedback storage status report.
  • the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • the number of feedback processes supported at the UE is determined based on one or more of an amount of storage available for feedback processes, a configured bandwidth for communications with the base station, a maximum code rate for communications with the base station, a number of concurrent spatial division multiplexing streams supported by the UE, or any combinations thereof.
  • the capability manager 1225 may receive UE capability information that indicates the number of feedback processes that are configurable at the UE.
  • the UE capability information is received during an initial access procedure or responsive to a reconfiguration of UE communications parameters.
  • the UE capability information is received in a medium access control (MAC) control element, in RRC signaling, in uplink control information (UCI) , or any combinations thereof.
  • the UE is a reduced capability UE that supports fewer feedback processes than a full-capability UE.
  • FIG. 13 shows a diagram of a system 1300 including a device 1305 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the device 1305 may be an example of or include the components of device 1005, device 1105, or a base station 105 as described herein.
  • the device 1305 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 1310, a network communications manager 1315, a transceiver 1320, an antenna 1325, memory 1330, a processor 1340, and an inter-station communications manager 1345. These components may be in electronic communication via one or more buses (e.g., bus 1350) .
  • buses e.g., bus 1350
  • the communications manager 1310 may receive, from a user equipment, an indication of a number of feedback processes that are configurable at the UE, configure, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE, and transmit, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • the network communications manager 1315 may manage communications with the core network (e.g., via one or more wired backhaul links) .
  • the network communications manager 1315 may manage the transfer of data communications for client devices, such as one or more UEs 115.
  • the transceiver 1320 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1320 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1320 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 1325. However, in some cases the device may have more than one antenna 1325, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 1330 may include RAM, ROM, or a combination thereof.
  • the memory 1330 may store computer-readable code 1335 including instructions that, when executed by a processor (e.g., the processor 1340) cause the device to perform various functions described herein.
  • a processor e.g., the processor 1340
  • the memory 1330 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 1340 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 1340 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into processor 1340.
  • the processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1330) to cause the device 1305 to perform various functions (e.g., functions or tasks supporting feedback resource status indication techniques for wireless communications) .
  • the inter-station communications manager 1345 may manage communications with other base station 105, and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communications manager 1345 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communications manager 1345 may provide an X2 interface within an LTE/LTE-A wireless communication network technology to provide communication between base stations 105.
  • the code 1335 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1335 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1335 may not be directly executable by the processor 1340 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 14 shows a flowchart illustrating a method 1400 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the operations of method 1400 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1400 may be performed by a communications manager as described with reference to FIGs. 6 through 9.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes.
  • 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 feedback storage manager as described with reference to FIGs. 6 through 9.
  • the UE may transmit, to a base station, an indication of the number of feedback processes that are configurable at the UE.
  • 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 status manager as described with reference to FIGs. 6 through 9.
  • the UE may receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes.
  • 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 configuration manager as described with reference to FIGs. 6 through 9.
  • the UE may configure the one or more feedback processes for communications with the base station based on the configuration information.
  • 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 feedback process manager as described with reference to FIGs. 6 through 9.
  • FIG. 15 shows a flowchart illustrating a method 1500 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the operations of method 1500 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1500 may be performed by a communications manager as described with reference to FIGs. 6 through 9.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes.
  • the operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by a feedback storage manager as described with reference to FIGs. 6 through 9.
  • the UE may transmit, to the base station, a feedback storage status report that indicates the number of feedback processes that are configurable at the UE.
  • 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 feedback status manager as described with reference to FIGs. 6 through 9.
  • the number of feedback processes that are configurable at the UE is indicated as a total quantity of configurable feedback processes. In some cases, the number of feedback processes that are configurable at the UE is indicated as a proportion of a maximum number of available feedback processes.
  • the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • the feedback storage status report is transmitted to the base station based on a configured periodicity for providing feedback storage status. In some cases, the feedback storage status report is transmitted to the base station responsive to a trigger event.
  • the UE may receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes.
  • 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 configuration manager as described with reference to FIGs. 6 through 9.
  • the UE may configure the one or more feedback processes for communications with the base station based on the configuration information.
  • the operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed by a feedback process manager as described with reference to FIGs. 6 through 9.
  • FIG. 16 shows a flowchart illustrating a method 1600 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the operations of method 1600 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1600 may be performed by a communications manager as described with reference to FIGs. 6 through 9.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may determine a number of feedback processes that are configurable at the UE based on an amount of storage at the UE that is available for feedback processes.
  • the operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed by a feedback storage manager as described with reference to FIGs. 6 through 9.
  • the UE may transmit UE capability information to the base station that indicates the number of feedback processes that are configurable at the UE.
  • the operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by a capability manager as described with reference to FIGs. 6 through 9.
  • the UE capability information is transmitted to the base station during an initial access procedure or responsive to a reconfiguration of UE communications parameters.
  • the number of feedback processes that are configurable at the UE includes feedback processes for unicast communications with the base station, feedback processes for multicast communications with the base station, or any combinations thereof.
  • the UE may receive reconfiguration information from the base station that indicates one or more reconfigured parameters for communications with the base station.
  • the operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed by a configuration manager as described with reference to FIGs. 6 through 9.
  • the UE may determine, based on the one or more reconfigured parameters, an updated number of feedback processes that are configurable at the UE.
  • the operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed by a configuration manager as described with reference to FIGs. 6 through 9.
  • the UE may receive, from the base station, configuration information for one or more feedback processes responsive to the indication of the number of feedback processes.
  • the operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed by a configuration manager as described with reference to FIGs. 6 through 9.
  • the UE may configure the one or more feedback processes for communications with the base station based on the configuration information.
  • the operations of 1630 may be performed according to the methods described herein. In some examples, aspects of the operations of 1630 may be performed by a feedback process manager as described with reference to FIGs. 6 through 9.
  • FIG. 17 shows a flowchart illustrating a method 1700 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the operations of method 1700 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 1700 may be performed by a communications manager as described with reference to FIGs. 10 through 13.
  • a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.
  • the base station may receive, from a user equipment, an indication of a number of feedback processes that are configurable at the UE.
  • the operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by a feedback status manager as described with reference to FIGs. 10 through 13.
  • the base station may configure, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE.
  • the operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by a configuration manager as described with reference to FIGs. 10 through 13.
  • the base station may transmit, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • the operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed by a feedback process manager as described with reference to FIGs. 10 through 13.
  • FIG. 18 shows a flowchart illustrating a method 1800 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the operations of method 1800 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 1800 may be performed by a communications manager as described with reference to FIGs. 10 through 13.
  • a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.
  • the base station may receive, from the UE, a feedback storage status report that indicates the number of feedback processes that are configurable at the UE.
  • the operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed by a feedback status manager as described with reference to FIGs. 10 through 13.
  • the base station may configure, responsive to the indication of the number of feedback processes that are configurable at the UE, one or more feedback processes for the UE.
  • the operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed by a configuration manager as described with reference to FIGs. 10 through 13.
  • the base station may transmit, to the UE, configuration information for the one or more feedback processes for communications with the base station.
  • the operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed by a feedback process manager as described with reference to FIGs. 10 through 13.
  • FIG. 19 shows a flowchart illustrating a method 1900 that supports feedback resource status indication techniques for wireless communications in accordance with aspects of the present disclosure.
  • the operations of method 1900 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 1900 may be performed by a communications manager as described with reference to FIGs. 10 through 13.
  • a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.
  • the base station may receive, from the UE, a feedback storage status report that indicates the number of feedback processes that are configurable at the UE.
  • the operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by a feedback status manager as described with reference to FIGs. 10 through 13.
  • the base station may determine, based on the feedback storage status report, that the UE can support one or more additional feedback processes.
  • the operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed by a feedback process manager as described with reference to FIGs. 10 through 13.
  • the base station may transmit, to the UE, additional configuration information for the one or more additional feedback processes for communications with the base station.
  • the operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by a feedback process manager as described with reference to FIGs. 10 through 13.
  • 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 random-access memory (RAM) , read-only memory (ROM) , electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • flash memory compact disk (CD) ROM or other optical disk storage
  • CD compact disk
  • 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,
  • 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

Sont décrits des procédés, des systèmes et des dispositifs pour des communications sans fil dans lesquels un équipement utilisateur (UE) peut fournir des informations à une station de base de desserte qui peut indiquer un certain nombre de processus de rétroaction qui peuvent être configurés au niveau de l'UE. L'UE peut déterminer le nombre de processus de rétroaction configurables sur la base d'une quantité de stockage au niveau de l'UE qui est disponible pour des processus de rétroaction, et d'une quantité de stockage utilisée par des procédés de rétroaction existants. L'indication du nombre de processus de rétroaction qui sont configurables au niveau de l'UE peut être fournie dans un rapport d'état de stockage HARQ (HSS) qui est transmis à la station de base. En outre ou en variante, l'UE peut transmettre une indication de capacité qui indique un certain nombre de processus de rétroaction que l'UE peut prendre en charge. Une telle indication de capacité peut être transmise dans une procédure d'accès initial, lors de la reconfiguration de paramètres de transmission, ou dans toute combinaison associée.
PCT/CN2020/114421 2020-09-10 2020-09-10 Techniques d'indication d'état de ressource de rétroaction pour communications sans fil WO2022051968A1 (fr)

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Citations (3)

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CN109716699A (zh) * 2016-09-30 2019-05-03 瑞典爱立信有限公司 用于混合自动重复请求过程的方法、网络设备和终端设备
CN110463111A (zh) * 2017-03-24 2019-11-15 高通股份有限公司 混合自动重复请求缓冲器配置
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CN110463111A (zh) * 2017-03-24 2019-11-15 高通股份有限公司 混合自动重复请求缓冲器配置
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