WO2020087259A1 - Efficacité améliorée pour décoder de multiples tailles de bits d'informations - Google Patents

Efficacité améliorée pour décoder de multiples tailles de bits d'informations Download PDF

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Publication number
WO2020087259A1
WO2020087259A1 PCT/CN2018/112596 CN2018112596W WO2020087259A1 WO 2020087259 A1 WO2020087259 A1 WO 2020087259A1 CN 2018112596 W CN2018112596 W CN 2018112596W WO 2020087259 A1 WO2020087259 A1 WO 2020087259A1
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Prior art keywords
decoding
information bits
paths
edc
candidate
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PCT/CN2018/112596
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English (en)
Inventor
Jian Li
Changlong Xu
Liangming WU
Jing Jiang
Hao Xu
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Qualcomm Incorporated
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Priority to PCT/CN2018/112596 priority Critical patent/WO2020087259A1/fr
Priority to PCT/CN2019/113922 priority patent/WO2020088435A1/fr
Publication of WO2020087259A1 publication Critical patent/WO2020087259A1/fr

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/13—Linear codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
    • H03M13/2906—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes using block codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/3707—Adaptive decoding and hybrid decoding, e.g. decoding methods or techniques providing more than one decoding algorithm for one code
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/3738—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35 with judging correct decoding
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0046—Code rate detection or code type detection
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0039—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver other detection of signalling, e.g. detection of TFCI explicit signalling
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes

Definitions

  • the following relates generally to wireless communications, and more specifically to enhanced efficiency for decoding multiple information bit sizes.
  • 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 a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • wireless devices may utilize error-correcting codes (e.g., polar codes) for encoding and decoding transmissions, such as physical downlink control channel (PDCCH) transmissions.
  • a first wireless device e.g., a UE
  • the first wireless device may perform blind detection.
  • the wireless device may monitor a channel (e.g., the PDCCH) and attempt to decode signals received over the channel using different combinations of transmission parameters, such as different time-frequency resources, aggregation levels, information bit sizes, etc.
  • the wireless device may perform a different decoding attempt for each combination of the transmission parameters until the transmission is successfully decoded or all of the decoding attempts fail. Performing all of these blind decoding attempts results in a significant processing overhead, decoding latency, or both at the wireless device.
  • a wireless device e.g., a user equipment (UE)
  • UE user equipment
  • a wireless device may perform blind detection to attempt to receive and decode a polar encoded transmission with unknown transmission parameters.
  • this transmission may be an example of a physical downlink control channel (PDCCH) transmission from a base station.
  • the UE may receive a decoding candidate for a codeword, and the UE may attempt to decode the candidate according to a first number of information bits, resulting in a set of decoding paths.
  • PDCCH physical downlink control channel
  • the wireless device may extract, from the failed decoding paths, additional decoding paths of a shorter length. These extracted paths may correspond to a second number of information bits smaller than the first number of information bits. The device may perform an EDC procedure on these extracted decoding paths to determine if any path corresponds to the successfully decoded codeword. In some cases, the UE may repeat this extraction procedure for other information bit sizes if no successful decoding path is identified. Additionally or alternatively, the UE may determine to perform decoding processes for other information bit sizes if the initial check (e.g., using the extracted decoding paths) for these information bit sizes are unsuccessful. This procedure may support a wireless device (e.g., the UE) reducing the number of decoding processes needed to test different information bit sizes for a codeword.
  • EDC error detection check
  • a method for wireless communications may include receiving a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code, and performing a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the method may further include determining that a first EDC operation fails for each decoding path of the one or more first decoding paths, extracting, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits, and performing a second EDC operation on each decoding path of the one or more second decoding paths.
  • the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code, and perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the instructions may be further executable by the processor to cause the apparatus to determine that a first EDC operation fails for each decoding path of the one or more first decoding paths, extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits, and perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • the apparatus may include means for receiving a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code, and means for performing a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the apparatus may further include means for determining that a first EDC operation fails for each decoding path of the one or more first decoding paths, means for extracting, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits, and means for performing a second EDC operation on each decoding path of the one or more second decoding paths.
  • a non-transitory computer-readable medium storing code for wireless communications is described.
  • the code may include instructions executable by a processor to receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code, and perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the code may further include instructions executable by the processor to determine that a first EDC operation fails for each decoding path of the one or more first decoding paths, extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits, and perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that the second EDC operation fails for each decoding path of the one or more second decoding paths.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for performing, based on the determining that the second EDC operation fails, a second decoding process on the decoding candidate according to the second number of information bits.
  • Other examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the determining that the second EDC operation fails, that the decoding candidate was not successfully decoded and performing a second decoding process on a second decoding candidate associated with the codeword based on the identifying, where the decoding candidate and the second decoding candidate correspond to a set of decoding candidates in a search space.
  • the decoding process may be an example of a first decoding process.
  • These examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining whether to perform a second decoding process on the decoding candidate according to the second number of information bits based on the determining that the second EDC operation fails and a signal-to-noise ratio (SNR) loss threshold.
  • SNR signal-to-noise ratio
  • determining whether to perform the second decoding process on the decoding candidate further may include operations, features, means, or instructions for calculating an estimated SNR loss for the second EDC operation based on a difference between the first number of information bits and the second number of information bits and comparing the estimated SNR loss for the second EDC operation to the SNR loss threshold.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for extracting, from the one or more first decoding paths, one or more third decoding paths with respective lengths equal to a third number of information bits that may be less than the first number of information bits and performing a third EDC operation on each decoding path of the one or more third decoding paths.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that the third EDC operation fails for each decoding path of the one or more third decoding paths and performing, based on the determining that the third EDC operation fails, a second decoding process on the decoding candidate according to the second number of information bits.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining to extract the one or more second decoding paths based on an SNR loss threshold.
  • determining to extract the one or more second decoding paths further may include operations, features, means, or instructions for calculating an estimated SNR loss for the extracting based on a difference between the first number of information bits and the second number of information bits, and identifying that the estimated SNR loss for the extracting may be less than the SNR loss threshold.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that the second EDC operation passes for a decoding path of the one or more second decoding paths and identifying the set of information bits according to the decoding path and the second number of information bits.
  • a set of bit channels of the decoding candidate for the second number of information bits is a subset of a set of bit channels of the decoding candidate for the first number of information bits.
  • the first EDC operation and the second EDC operation are examples of cyclic redundancy check (CRC) operations.
  • CRC cyclic redundancy check
  • the set of information bits includes downlink control information (DCI) for a PDCCH transmission.
  • FIGs. 1 and 2 illustrate examples of wireless communications systems that support enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates an example of a device that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • FIG. 4 illustrates an example of a decoding process that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • FIG. 5 illustrates an example of a process flow that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • FIGs. 6 and 7 show block diagrams of devices that support enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • FIG. 8 shows a block diagram of a blind decoder that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • FIG. 9 shows a diagram of a system including a user equipment (UE) that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • UE user equipment
  • FIG. 10 shows a diagram of a system including a base station that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • FIGs. 11 through 15 show flowcharts illustrating methods that support enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • Some wireless communications systems may support encoding of transmissions using error-correcting codes, such as polar codes.
  • a base station may polar encode a physical downlink control channel (PDCCH) transmission and may transmit the polar encoded transmission to one or more user equipment (UEs) .
  • the PDCCH transmission may contain encoded downlink control information (DCI) bits indicating control information for a UE.
  • DCI downlink control information
  • the UE may monitor a downlink control channel for downlink transmissions in a blind detection procedure.
  • the UE may perform decoding processes (e.g., successive cancellation (SC) or successive cancellation list (SCL) decoding processes) using a polar code and different decoding parameters (e.g., different search spaces, different control channel element (CCE) aggregation levels, different DCI sizes, etc. ) .
  • decoding processes e.g., successive cancellation (SC) or successive cancellation list (SCL) decoding processes
  • different decoding parameters e.g., different search spaces, different control channel element (CCE) aggregation levels, different DCI sizes, etc.
  • the UE may perform decoding path extraction in place of or in addition to decoding a code block using different information bit sizes.
  • the UE may identify multiple different DCI sizes (where the DCI size may correspond to the number of information bits, K, or the number of information bits minus any error detection check (EDC) bits, K-C) that a base station may use for one PDCCH codeword size, M.
  • the UE may receive a decoding candidate association with the codeword, but the UE may not determine the correct DCI size to use for decoding the decoding candidate. Instead, the UE may attempt to decode the received decoding candidate using different numbers of information bits.
  • the UE may perform a single polar decoding operation on the decoding candidate using the greatest DCI size, K 1 , of the multiple different DCI sizes.
  • the polar decoding operation may result in one or more decoding paths, each path containing K 1 decoded information bits.
  • the UE may perform an error check on each of these decoding paths to determine if any decoding path corresponds to the successfully decoded codeword. If none of the decoding paths pass the error check, the UE may test another information bit size, K 2 .
  • the UE may extract decoding paths for the second information bit size, K 2 , from the decoding paths computed for the first information bit size, K 1 .
  • the UE may determine multiple sets of decoding paths corresponding to different DCI sizes (e.g., information bit sizes) from a single polar decoding process using a single DCI size.
  • the UE may perform an error check on the second set of decoding paths to determine whether any of these paths corresponds to the successfully decoded codeword.
  • the UE may extract decoding paths for any number of information bit sizes from the decoding paths resulting from the polar decoding procedure. In some cases, the extraction procedure may not result in a successfully decoded codeword (e.g., if no decoding path passes the error check) . In a first example, the UE may then perform a polar decoding process on the decoding candidate using the second DCI size, K 2 . In a second example, the UE may not attempt a polar decoding process using the second DCI size, K 2 , and instead may proceed with other decoding attempts in the blind detection procedure.
  • the UE may determine whether or not to perform the polar decoding process using the second DCI size, K 2 , based on a signal-to-noise ratio (SNR) loss threshold. For example, if refraining from performing the polar decoding process using the second DCI size results in a significant SNR loss (e.g., greater than or equal to the SNR loss threshold) , the UE may determine to perform the polar decoding process using this second DCI size.
  • SNR signal-to-noise ratio
  • aspects of the disclosure are initially described in the context of wireless communications systems. Further aspects of the disclosure are described with reference to a device (e.g., a device supporting polar decoding) , a decoding process, and a process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to enhanced efficiency for decoding multiple information bit sizes.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the wireless communications system 100 includes base stations 105, 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-Advanced Pro
  • NR New Radio
  • wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low-cost and low-complexity devices.
  • ultra-reliable e.g., mission critical
  • Base stations 105 may wirelessly communicate with UEs 115 via one or more base station antennas.
  • Base stations 105 described herein may include or may be referred to by those skilled 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 giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or some other suitable terminology.
  • Wireless communications system 100 may include base stations 105 of different types (e.g., macro or small cell base stations) .
  • the UEs 115 described herein may be able to communicate with various types of base stations 105 and network equipment including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like.
  • Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 is supported. Each base station 105 may provide communication coverage for a respective geographic coverage area 110 via communication links 125, and communication links 125 between a base station 105 and a UE 115 may utilize one or more carriers. Communication links 125 shown in 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. Downlink transmissions may also be called forward link transmissions while uplink transmissions may also be called reverse link transmissions.
  • the geographic coverage area 110 for a base station 105 may be divided into sectors making up only a portion of the geographic coverage area 110, and each sector may be associated with a cell.
  • each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other types of cells, or various combinations thereof.
  • 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, and overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.
  • the term “cell” refers 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) ) operating via the same or a different carrier.
  • a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband Internet-of-Things (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of devices.
  • MTC machine-type communication
  • NB-IoT narrowband Internet-of-Things
  • eMBB enhanced mobile broadband
  • the term “cell” may refer to a portion of a geographic coverage area 110 (e.g., a sector) over which the logical entity operates.
  • UEs 115 may be dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also 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.
  • a UE 115 may also be 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 also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, or the like, which may be implemented in various articles such as appliances, vehicles, meters, or the like.
  • WLL wireless local loop
  • IoT Internet of Things
  • IoE Internet of Everything
  • MTC massive machine type communications
  • 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 that information to a central server or application program that can make use of the information or present the information to humans interacting with the program or application.
  • Some UEs 115 may be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
  • Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) . In some examples half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for UEs 115 include entering a power saving “deep sleep” mode when not engaging in active communications, or operating over a limited bandwidth (e.g., according to narrowband communications) . In some cases, UEs 115 may be designed to support critical functions (e.g., mission critical functions) , and a wireless communications system 100 may be configured to provide ultra-reliable communications for these functions.
  • critical functions e.g., mission critical functions
  • a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol) .
  • P2P peer-to-peer
  • D2D device-to-device
  • One or more of a group of 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 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.
  • D2D communications are carried out between UEs 115 without the involvement of a base
  • Base stations 105 may communicate with the core network 130 and with one another.
  • base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., via an S1, N2, N3, or other interface) .
  • Base stations 105 may communicate with one another over backhaul links 134 (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) .
  • 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) , which may include at least one mobility management entity (MME) , at least one serving gateway (S-GW) , and at least one Packet Data Network (PDN) gateway (P-GW) .
  • the MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC.
  • User IP packets may be transferred through the S-GW, which itself may be connected to the P-GW.
  • the P-GW may provide IP address allocation as well as other functions.
  • the P-GW may be connected to the network operators IP services.
  • the operators IP services may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched (PS) Stream
  • At least some of the network devices may include subcomponents such as an access network entity, which may be an example of an access node controller (ANC) .
  • Each access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, or a transmission/reception point (TRP) .
  • TRP transmission/reception point
  • various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 105) .
  • 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, since the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features. However, the waves may penetrate structures sufficiently for a macro cell to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter range (e.g., less than 100 km) 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
  • Wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band.
  • SHF region includes bands such as the 5 GHz industrial, scientific, and medical (ISM) bands, which may be used opportunistically by devices that may be capable of tolerating interference from other users.
  • ISM bands 5 GHz industrial, scientific, and medical bands
  • Wireless communications system 100 may also operate in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band.
  • EHF extremely high frequency
  • wireless communications system 100 may support millimeter wave (mmW) communications between UEs 115 and base stations 105, and EHF antennas of the respective devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate use of antenna arrays within a UE 115.
  • mmW millimeter wave
  • the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. Techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
  • wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • 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 ISM band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz ISM band.
  • wireless devices such as base stations 105 and UEs 115 may employ listen-before-talk (LBT) procedures to ensure a frequency channel is clear before transmitting data.
  • LBT listen-before-talk
  • 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, peer-to-peer transmissions, or a combination of these.
  • Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD) , time division duplexing (TDD) , or a combination of both.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • base station 105 or 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.
  • wireless communications system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115) , where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas.
  • MIMO communications may employ multipath signal propagation to increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing.
  • the multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas.
  • Each of the multiple signals may be referred to as a separate spatial stream, and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams.
  • Different spatial layers may be associated with different antenna ports used for channel measurement and reporting.
  • MIMO techniques include single-user MIMO (SU-MIMO) where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) where multiple spatial layers are transmitted to multiple devices.
  • SU-MIMO single-user MIMO
  • MU-MIMO multiple-user MIMO
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or 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 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 certain amplitude and phase offsets to signals carried via each of the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
  • a base station 105 may use multiple antennas or antenna arrays to conduct beamforming operations for directional communications with a UE 115. For instance, some signals (e.g. synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station 105 multiple times in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
  • some signals e.g. synchronization signals, reference signals, beam selection signals, or other control signals
  • Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
  • Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
  • the beam direction associated with transmissions along a single beam direction may be determined based at least in in part on a signal that was transmitted in different beam directions.
  • a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions, and the UE 115 may report to the base station 105 an indication of the signal it received with a highest signal quality, or an otherwise acceptable signal quality.
  • a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) , or transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
  • a receiving device may try multiple receive beams when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
  • a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive beams or receive directions.
  • a receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio, or otherwise acceptable signal quality based at least in part on listening according to multiple beam directions) .
  • the antennas of a base station 105 or UE 115 may be located within one or more antenna arrays, 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.
  • wireless communications system 100 may be a packet-based network that operate according to a layered protocol stack.
  • PDCP Packet Data Convergence Protocol
  • 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 hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency.
  • HARQ hybrid automatic repeat request
  • 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 core network 130 supporting radio bearers for user plane data.
  • RRC Radio Resource Control
  • transport channels may be mapped to physical channels.
  • UEs 115 and base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • HARQ feedback is one technique of 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., signal-to-noise conditions) .
  • a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
  • the radio frames may be identified by a system frame number (SFN) ranging from 0 to 1023.
  • SFN system frame number
  • Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms.
  • a subframe may be further divided into 2 slots each having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods.
  • a subframe may be the smallest scheduling unit of the wireless communications system 100, and may be referred to as a transmission time interval (TTI) .
  • TTI transmission time interval
  • a smallest scheduling unit of the wireless communications system 100 may be shorter than a subframe or may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or in selected component carriers using sTTIs) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols.
  • a symbol of a mini-slot or a mini-slot may be the smallest unit of scheduling.
  • Each symbol may vary in duration depending on the subcarrier spacing or frequency band of operation, for example.
  • some wireless communications systems may implement slot aggregation in which multiple slots or mini-slots are aggregated together and used for communication between a UE 115 and a base station 105.
  • carrier refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over a communication link 125.
  • a carrier of a communication link 125 may include a portion of a radio frequency spectrum band that is operated according to physical layer channels for a given radio access technology.
  • Each physical layer channel may carry user data, control information, or other signaling.
  • a carrier may be associated with a pre-defined 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 UEs 115.
  • E-UTRA evolved universal mobile telecommunication system terrestrial radio access
  • E-UTRA absolute radio frequency channel number
  • Carriers may be downlink or uplink (e.g., in an FDD mode) , or be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
  • signal waveforms transmitted over a carrier may be made up of multiple sub-carriers (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
  • the organizational structure of the carriers may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • communications over a carrier may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding the user data.
  • a carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc. ) and control signaling that coordinates operation for the carrier.
  • acquisition signaling e.g., synchronization signals or system information, etc.
  • control signaling that coordinates operation for the carrier.
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • 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 time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • control information transmitted in a physical control channel may be distributed between different control regions in a cascaded manner (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces) .
  • 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 predetermined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) .
  • each served UE 115 may be configured for operating over portions or all of the carrier bandwidth.
  • some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
  • a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
  • 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 more resource elements that a UE 115 receives and the higher the order of the modulation scheme the higher the data rate may be for the UE 115.
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers) , and the use of multiple spatial layers may further increase the data rate for communications with a UE 115.
  • a spatial resource e.g., spatial layers
  • Devices of the wireless communications system 100 may have a hardware configuration that supports communications over a particular carrier bandwidth, or may be configurable to support communications over one of a set of carrier bandwidths.
  • the wireless communications system 100 may include base stations 105 and/or UEs 115 that support simultaneous communications via carriers associated with more than one different carrier bandwidth.
  • Wireless communications system 100 may support communication with a UE 115 on multiple cells or carriers, a feature which may be referred to as 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 FDD and TDD component carriers.
  • wireless communications system 100 may utilize enhanced component carriers (eCCs) .
  • eCC may be characterized by one or more features including wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or modified control channel configuration.
  • an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have a suboptimal or non-ideal backhaul link) .
  • An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum) .
  • An eCC characterized by wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are not capable of monitoring the whole carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power) .
  • an eCC may utilize a different symbol duration than other component carriers, which may include use of a reduced symbol duration as compared with symbol durations of the other component carriers.
  • a shorter symbol duration may be associated with increased spacing between adjacent subcarriers.
  • a device such as a UE 115 or base station 105, utilizing eCCs may transmit wideband signals (e.g., according to frequency channel or carrier bandwidths of 20, 40, 60, 80 MHz, etc. ) at reduced symbol durations (e.g., 16.67 microseconds) .
  • a TTI in eCC may consist of one or multiple symbol periods. In some cases, the TTI duration (that is, the number of symbol periods in a TTI) may be variable.
  • Wireless communications system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, among others.
  • the flexibility of eCC symbol duration and subcarrier spacing may allow for the use of eCC across multiple spectrums.
  • NR shared spectrum may increase spectrum utilization and spectral efficiency, specifically through dynamic vertical (e.g., across the frequency domain) and horizontal (e.g., across the time domain) sharing of resources.
  • Wireless communications system 100 may support encoding of transmissions using error-correcting codes, such as polar codes.
  • a base station 105 may polar encode a PDCCH transmission and may transmit the polar encoded transmission to one or more UEs 115.
  • the PDCCH transmission may contain encoded DCI bits indicating control information for a UE 115.
  • the UE 115 may monitor a downlink control channel for downlink transmissions in a blind detection procedure.
  • the UE 115 may perform decoding processes (e.g., SC or SCL decoding processes) using a polar code and different decoding parameters.
  • the UE 115 may perform decoding path extraction for multiple information bit sizes to reduce the potential number of SC or SCL decoding processes associated with blind detection.
  • the UE 115 may identify multiple different DCI sizes (e.g., numbers of information bits, K) that a base station 105 may use for one PDCCH codeword size, M.
  • the UE 115 may receive a decoding candidate associated with the codeword, but the UE 115 may not determine the correct DCI size to use for decoding the decoding candidate. Instead, the UE 115 may attempt to decode the received decoding candidate using different numbers of information bits.
  • the UE 115 may perform a single polar decoding operation on the decoding candidate using the greatest DCI size, K 1 , of the multiple different DCI sizes.
  • the polar decoding operation may result in one or more decoding paths, each path containing K 1 decoded information bits.
  • the UE 115 may perform an error check (e.g., using EDC bits, such as cyclic redundancy check (CRC) bits) on each of these decoding paths to determine if any decoding path corresponds to the successfully decoded codeword. If none of the decoding paths pass the error check, the UE 115 may test another information bit size, K 2 . However, rather than performing another SC or SCL decoding process to determine decoding paths for this information bit size, the UE 115 may extract decoding paths for the second information bit size, K 2 , from the decoding paths computed for the first information bit size, K 1 .
  • EDC bits such as cyclic redundancy check (CRC) bits
  • the UE 115 may determine multiple sets of decoding paths corresponding to different DCI sizes (e.g., information bit sizes) from a single polar decoding process using a single DCI size.
  • the UE 115 may perform an error check on the second set of decoding paths to determine whether any of these paths corresponds to the successfully decoded codeword.
  • the UE 115 may extract decoding paths for any number of information bit sizes from the decoding paths resulting from the polar decoding procedure. In some cases, the extraction procedure may not result in a successfully decoded codeword (e.g., if no decoding path passes the error check) . In a first example, the UE 115 may then perform a polar decoding process on the decoding candidate using the second DCI size, K 2 . In a second example, the UE 115 may not attempt a polar decoding process using the second DCI size, K 2 , and instead may proceed with other decoding attempts in the blind detection procedure.
  • the UE 115 may determine whether or not to perform the polar decoding process using the second DCI size, K 2 , based on an SNR loss threshold. For example, if refraining from performing the polar decoding process using the second DCI size results in a significant SNR loss (e.g., greater than or equal to the SNR loss threshold) , the UE 115 may determine to perform the polar decoding process using this second DCI size.
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the wireless communications system 200 may be an example of a wireless communications system 100 as described with reference to FIG. 1.
  • the wireless communications system 200 may include base station 105-a and UE 115-a, which may be examples of the corresponding devices described with reference to FIG. 1.
  • Base station 105-a may provide network coverage for geographic area 110-a and may communicate with UE 115-a. For example, base station 105-a may transmit control information and data to UE 115-a on a downlink channel 205.
  • base station 105-a may encode a PDCCH transmission 210 using an error-correcting code, such as a polar code, and may transmit the resulting codeword 215 on the downlink channel 205 to UE 115-a.
  • the encoded information bits for this PDCCH transmission 210 may include DCI bits and EDC bits (e.g., CRC bits) for improved decoding reliability at UE 115-a, where the EDC bits may be included in one portion of the information bit channels or distributed throughout the information bit channels.
  • UE 115-a may detect the PDCCH transmission 210 and may attempt to decode the information contained in the PDCCH transmission 210 using different decoding parameters.
  • base stations 105 and UEs 115 may handle transmissions, such as PDCCH transmissions 210, encoded using polar codes.
  • base station 105-a may determine a set of information bits for transmission, where the information bits indicate DCI.
  • Base station 105-a may polar encode the set of information bits to obtain a set of coded bits.
  • base station 105-a may additionally include a set of EDC bits (e.g., CRC bits, parity bits, etc. ) in the set of information bits.
  • base station 105-a may include a number (e.g., 8, 16, 24, 32, etc. ) of CRC bits in the with the DCI bits.
  • Base station 105-a may transmit the codeword 215 for the PDCCH transmission 210 to UE 115-a.
  • UE 115-a may monitor the downlink channel 205 for transmissions from base station 105-a.
  • UE 115-a may perform blind decoding on a number of decoding candidates using one or more polar codes to attempt to detect the codeword 215.
  • UE 115-a may use a list decoder (e.g., an SCL decoder) to attempt to decode each received decoding candidate. Using the list decoder, UE 115-a may determine multiple decoding paths for the codeword 215 for a specific set of decoding parameters.
  • a list decoder e.g., an SCL decoder
  • UE 115-a may perform a different decoding attempt for different combinations of time-frequency resources (e.g., starting CCEs) , CCE aggregation levels (e.g., corresponding to different code block lengths, M) , DCI sizes, etc., across one or more search spaces.
  • UE 115-a may identify 44 different combinations for decoding attempts in a blind detection procedure for a PDCCH transmission 210. If one decoding attempt is successful (e.g., according to a decoding path passing a final CRC check) , the UE 115-a may terminate the decoding process (e.g., without trying any further decoding attempts for the codeword 215) and output the DCI bits corresponding to this successful decoding path.
  • UE 115-a may identify multiple information bit sizes to test for a same received code block (e.g., the codeword 215) in a blind detection procedure.
  • table 220 illustrates possible code block size and DCI size combinations that base station 105-a may use for PDCCH transmissions 210 at different aggregation levels.
  • the UE 115-a may perform a first polar decoding process according to the largest number of information bits to test, K 1 .
  • UE 115-a may decode the codeword according to the information bit size/code block length combination (K 1 , M) .
  • UE 115-a may determine one or more decoding paths for the K 1 information bits based on performing the polar decoding process (e.g., where the number of decoding paths is based on the configuration of the decoder) .
  • UE 115-a may extract the payload bits and the CRC bits from each decoding path and may perform a CRC procedure using the CRC bits to check the determined payload bits.
  • UE 115-a may determine that the DCI size for the PDCCH transmission 210 corresponds with K 1 (e.g., the payload bits of K 1 ) and may output the corresponding payload bits as the successfully decoded DCI bits. In these cases, UE 115-a may not test any other information bit sizes, as the UE 115-a determined that K 1 was successful. However, if every decoding path for the set of one or more decoding paths fails the CRC, UE 115-a may determine that the DCI size for the PDCCH transmission 210 is not K 1 (or that the codeword 215 was not successfully received) and may proceed to test another information bit size (e.g., K 2 ) .
  • K 1 e.g., the payload bits of K 1
  • UE 115-a may extract the K 2 information bits from the decoding paths determined for the K 1 information bits in the (K 1 , M) decoding process. For example, if K 2 ⁇ K 1 , the information bit channels for K 2 in a code block may be a subset of the information bit channels for K 1 in the code block, and the rate matching scheme (e.g., including repetition, puncturing, shortening, etc. ) for the code block for K 1 and K 2 may be the same, then the decoding paths for the K 1 information bits contain decoding paths for the K 2 information bits. UE 115-a may perform an additional CRC operation for the payload bits in these extracted sets of K 2 information bits.
  • the rate matching scheme e.g., including repetition, puncturing, shortening, etc.
  • UE 115-a may determine that the DCI size for the PDCCH transmission 210 is K 2 and may output the corresponding payload bits as the successfully decoded DCI bits. In this way, UE 115-a may test for two different DCI sizes K 1 and K 2 using a single decoding process.
  • UE 115-a may decode the two different DCI sizes K 1 and K 2 simultaneously (e.g., during a same decoding process for the DCI size K 1 ) .
  • the UE 115-a may automatically perform the extraction procedure for the DCI size K 2 and may perform EDC operations for both sets of decoding paths (e.g., the decoding paths for K 1 and K 2 ) .
  • UE 115-a may perform extraction for an arbitrary number of DCI sizes, J. For example, for a code block of length M, UE 115-a may decode according to an information bit size/code block length combination (K 1 , M) , where K 1 is the maximum number of information bits for K 1 , K 2 , ..., K J . Based on this decoding process, UE 115-a may extract K 1 information bits (e.g., including CRC bits) and may perform a CRC operation on the decoding paths resulting from this decoding process.
  • K 1 information bits e.g., including CRC bits
  • the UE 115-a may identify that the DCI size for the codeword is K 1 , and the UE 115-a may not test for the other DCI sizes. However, if the CRC fails for the decoding paths, UE 115-a may extract K 2 information bits (e.g., including CRC bits) and may perform an additional CRC operation on these extracted decoding paths. If the additional CRC passes for a decoding path, the UE 115-a may identify that the DCI size for the codeword is K 2 , and the UE 115-a may not test any further DCI sizes.
  • K 2 information bits e.g., including CRC bits
  • UE 115-a may continue iteratively extracting information bits according to the possible DCI sizes until a CRC passes for a decoding path or until UE 115-aextracts K J information bits (e.g., including CRC bits) . If a decoding path passes the CRC for the K J information bits, UE 115-a may identify that the DCI size for the codeword is K J . If no decoding path passes the CRC for the K J information bits, UE 115-a may determine to perform a next step in the blind detection procedure (e.g., perform another SC or SCL decoding process according to different decoding parameters, monitor for an additional codeword 215, etc. ) .
  • K J information bits e.g., including CRC bits
  • performing the extraction procedure to test different DCI sizes based on a same polar decoding process may result in SNR loss. For example, if a decoding process is performed based on (K 1 , M) , but an error check is performed on extracted K 2 information bits, the error check may result in an approximate SNR loss of 10log 10 ( (K 1 -K 2 ) /M) (e.g., as compared to decoding based on (K 2 , M) and performing an error check on the resulting K 2 decoded information bits) . Generally, if the value of K 1 -K 2 is relatively small (e.g., below some threshold value) , the SNR loss may be small.
  • UE 115-a may not attempt to polar decode the codeword 215 using (K 2 , M) , incurring a corresponding SNR loss.
  • the polar decoder may reduce the decoding complexity for the blind detection process by 1/J, where J is the number of different DCI sizes to test.
  • UE 115-a may attempt to polar decode the codeword 215 using (K 2 , M) , resulting in no SNR loss.
  • the polar decoder may reduce the decoding complexity for the blind detection process by up to 1/J, or the decoding complexity and latency may not be reduced (e.g., if UE 115-a attempts polar decoding at each information bit size) .
  • the extraction procedure does not result in any SNR loss for the blind detection process.
  • UE 115-a may calculate an estimated SNR loss for performing EDC based on K 2 information bits extracted from decoding paths computed in a (K 1 , M) decoding process, where the calculation may be based on the values of K 1 , K 2 , M, or some combination of these.
  • UE 115-a may compare this estimated SNR loss to an SNR loss threshold.
  • UE 115-a may perform polar decoding based on (K 2 , M) if the estimated SNR loss is greater than or equal to the SNR loss threshold, and UE 115-a may refrain from performing polar decoding based on (K 2 , M) if the estimated SNR loss is less than the SNR loss threshold.
  • the SNR loss threshold may be pre-configured or dynamically determined by UE 115-a.
  • FIG. 3 illustrates an example of a device 300 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • device 300 may be implemented by aspects of a wireless communications system 100 or 200.
  • the device 300 may be any device within a wireless communications system that performs an encoding or decoding process (e.g., using an error-correcting code, such as a polar code) .
  • device 300 may be an example of a UE 115 or a base station 105 as described with reference to FIGs. 1 and 2.
  • a base station 105 transmitting a polar encoded PDCCH transmission may be an example of a device 300 including at least a memory 305, an encoder 310, and a transmitter 315.
  • a UE 115 receiving the polar encoded PDCCH transmission may be an example of a device 300 including at least a receiver 315, a decoder 310, and a memory 305.
  • device 300 may include a memory 305, an encoder/decoder 310, and a transmitter/receiver 315.
  • First bus 320 may connect memory 305 to encoder/decoder 310 and second bus 325 may connect encoder/decoder 310 to transmitter/receiver 315.
  • device 300 may have data stored in memory 305 to be transmitted to another device, such as a UE 115 or base station 105.
  • device 300 may retrieve from memory 305 the data for transmission.
  • the data for transmission may include downlink control data for a UE 115 or a set of UEs 115.
  • the data may include a number of payload bits, ‘A, ’ which may be 1s or 0s, provided from memory 305 to encoder/decoder 310 via first bus 320.
  • these payload bits may be combined with a number of error checking bits (e.g., EDC bits, such as CRC bits or parity check bits) , ‘C, ’ to form a total set of information bits, ‘A+C. ’
  • EDC bits e.g., EDC bits, such as CRC bits or parity check bits
  • C parity check bits
  • this number of information bits, K, or the number of payload bits, A may be based on the selected DCI format.
  • the encoder/decoder 310 may implement a polar code with a block length, ‘N, ’ for encoding the information bits, where N may be different than or the same as K. Such a polar code may be referred to as an (N, K) polar code.
  • N-K bits the bits not allocated as information bits
  • Frozen bits may be bits with a default value known to both the encoding and decoding devices 300 (e.g., bits with a default bit value of 0) .
  • the transmitter 315 or encoder 310 may perform rate matching to fit the N encoded bits to a code block size of M, and the transmitter 315 may transmit these M coded bits in a PDCCH transmission to a receiving device 300.
  • the receiving device 300 may perform blind detection to receive the transmission at a receiver 315 and pass the received information along to a decoder 310 for polar decoding.
  • decoder 310 may be an example of an SC or SCL decoder.
  • a UE 115 or base station 105 may receive a transmission including a codeword at receiver 315 and may send the transmission to the SCL decoder (e.g., decoder 310) .
  • the SCL decoder may determine input logarithmic-likelihood ratios (LLRs) for the bit channels of the received codeword.
  • LLRs logarithmic-likelihood ratios
  • the SCL decoder may determine decoded LLRs based on these input LLRs, where the decoded LLRs correspond to each bit channel of the polar code. These decoded LLRs may be referred to as bit metrics.
  • the SCL decoder may determine the corresponding bit is a 0 bit, and a negative LLR may correspond to a 1 bit.
  • the SCL decoder may use the bit metrics to determine the decoded bit values.
  • the SCL decoder may employ multiple concurrent SC decoding processes. Each SC decoding process may decode the codeword sequentially (e.g., in order of the bit channel indices, in the U-domain) . Due to the combination of multiple SC decoding processes, the SCL decoder may calculate multiple decoding path candidates. For example, an SCL decoder of list size ‘L’ (i.e., the SCL decoder has L SC decoding processes) may calculate L decoding path candidates, and a corresponding reliability metric (e.g., a path metric) for each decoding path candidate.
  • the path metric may represent a reliability of a decoding path candidate or a probability that the corresponding decoding path candidate is the correct set of decoded bits.
  • the path metric may be based on the determined bit metrics and the bit values selected at each bit channel.
  • the SCL decoder may have a number of levels equal to the number of bit channels in the received codeword. At each level corresponding to an information bit channel, each decoding path candidate may be extended by both a 0 bit and a 1 bit. The SCL decoder may then select L decoding paths to survive based on the path metrics of the 2L extended decoded paths (e.g., the SCL decoder may select the L paths with the best path metrics) and may prune the unselected decoding paths to maintain the proper list size for decoding. At frozen bit channels, each decoding path candidate may be extended by the frozen bit value, and the path metrics may be updated for each of the L decoding paths.
  • the SCL decoder may select a decoding path candidate based on an EDC operation. For example, the SCL decoder may check each decoding path candidate using a set of decoded EDC bits (e.g., CRC bits) . If a decoding path candidate passes the EDC operation, the decoder 310 may output the successfully decoded path candidate-or the corresponding payload bits-based on the result of the error checking process.
  • EDC bits e.g., CRC bits
  • a receiving device 300 may attempt to decode a received candidate codeword using different numbers of information bits.
  • the numbers of information bits to test may be based on a configuration of the device 300.
  • the decoder 310 may perform bit extraction on the decoding path candidates resulting from an SCL decoding process. For example, the decoder 310 may perform an SCL decoding process based on a set of K 1 information bits.
  • the decoder 310 may extract a set of K 2 information bits from each of these decoding path candidates and may perform an error check for the K 2 information bits. In this way, for a small loss in SNR, the decoder 310 may test multiple information bit sizes using a single decoding process, reducing the processing overhead and decoding latency associated with blind detection.
  • FIG. 4 illustrates an example of a decoding process 400 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the decoding process 400 may be performed by a wireless device performing a blind detection procedure, such as a UE 115, base station 105, or device 300 as described with reference to FIGs. 1 through 3.
  • the decoding process 400 may involve a UE 115 receiving a candidate codeword 405, performing a decoding process (e.g., a list decoding process) on the candidate codeword, and determining a set of payload bits 450 based on a successful decoding procedure.
  • a decoding process e.g., a list decoding process
  • the UE 115 may monitor a channel for transmission from a base station 105.
  • the UE 115 may receive a candidate codeword 405 corresponding to polar encoded DCI for a PDCCH transmission.
  • the UE 115 may pass the candidate codeword 405 to a list decoder 410 for blind decoding.
  • the list decoder 410 may implement a decoding technique that enhances the efficiency for decoding multiple information bit sizes.
  • These information bit sizes may correspond to the polar codes 415-a and 415-b, where K 1 >K 2 and the information bits 420 for polar code 415-a contain the information bits 420 for polar code 415-b. That is, the set of information bit channels for the (K 2 , N) polar code 415-b is a subset of the set of information bit channels for the (K 1 , N) polar code 415-a. The remaining bit channels in each polar code 415 may contain frozen bits 425.
  • the list decoder 410 may perform a decoding process for the candidate codeword using the (K 1 , N) polar code 415-a.
  • the decoding process may further be based on a rate matching procedure for obtaining the received M-bit code block from the N-bit polar code.
  • the list decoder 410 may determine a set of decoding paths 430-abased on a decoding process.
  • the list decoder 410 may iteratively make hard decisions on bits based on computed LLRs, back-propagation of other hard decisions on bits, and bit channel types.
  • the list decoder 410 may assign 0 bit values to each frozen bit channel and may select a 0 bit value or a 1 bit value for each information bit channel at each step in the decoding process (e.g., based on calculated LLR values for the information bit channels) .
  • the (K 1 , N) decoding process may be dependent on the locations (i.e., bit channels) of the K 1 information bits within the N-length polar code 415-a.
  • the list decoder 410 extends the decoding paths 430 one bit at a time until a hard decision is made for each bit in the polar code 415.
  • Each resulting decoding path may correspond to a set of K 1 decoded bits 435, where the decoded bits include both payload bits and EDC bits (e.g., CRC bits) .
  • the list decoder 410 may perform an error check on each set of K 1 decoded bits 435 based on the respective EDC bits. In some cases, every path of the set of decoding paths 430-a fails the EDC operation (e.g., the CRC bits for the K 1 decoded bits 435-a, 435-b, 435-c, and 435-d do not correspond to the payload bits for these sets of decoded bits) . Accordingly, the list decoder 410 may determine that the candidate codeword 405 does not correspond to a set of information bits of size K 1 .
  • the list decoder 410 may perform an extraction process 440 to determine a set of decoding paths 430-b based on the set of decoding paths 430-a. For example, for each set of K 1 decoded bits 435, the list decoder 410 may extract a set of K 2 decoded bits 445.
  • the extraction process 440 may remove the extra K 1 -K 2 information bits from each set of K 1 decoded bits 435 (e.g., according to the bit channel assignments) to identify the decoding paths 430-b (e.g., corresponding to the sets of K 2 decoded bits 445-a, 445-b, 445-c, and 445-d) .
  • the list decoder 410 may determine decoding paths 430-a (e.g., corresponding to the information bit size K 1 ) and decoding paths 430-b (e.g., corresponding to the information bit size K 2 ) using a single decoding operation according to the (K 1 , N) polar code 415-a.
  • the list decoder 410 may perform an error check on each set of K 2 decoded bits 445 based on the respective EDC bits. If a path of the set of decoding paths 430-b passes the EDC operation, the list decoder 410 may determine that the candidate codeword 405 corresponds to a set of information bits of size K 2 without performing a decoding operation using the information bit size K 2 .
  • the list decoder 410 may output the payload bits 450 determined in this set of K 2 decoded bits 445-c as the decoded DCI bits.
  • This decoding process 400 may reduce the processing overhead and decoding latency involved in blind detection for a candidate codeword 405 by potentially reducing the number of SCL decoding processes performed.
  • FIG. 5 illustrates an example of a process flow 500 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the process flow 500 may include a base station 105-b and a UE 115-b, which may be examples of the corresponding devices described with reference to FIGs. 1 and 2. Additionally, base station 105-b and UE 115-b may be examples of devices 300 as described with reference to FIG. 3.
  • 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.
  • base station 105-b may polar encode a set of information bits. In some cases, these information bits may correspond to DCI for UE 115-b. Base station 105-b may also include CRC bits in the set of information bits to support reliable decoding.
  • base station 105-b may transmit the coded bits (e.g., M coded bits after rate matching) as a codeword on the downlink to UE 115-b.
  • UE 115-b may monitor the channel as part of a blind detection procedure and may perform one or more decoding processes to attempt to decode the polar encoded set of information bits. For example, UE 115-b may receive one or more decoding candidates associated with the transmitted codeword and may perform an efficient decoding procedure at 515 to decode the information bits.
  • UE 115-b may perform a decoding process on a decoding candidate according to a first number of information bits, K 1 .
  • This decoding process may result in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the number of first decoding paths may be based on a configuration or capability of UE 115-b (e.g., a list size supported by an SCL decoder of the UE 115-b) .
  • UE 115-b may perform an EDC operation (e.g., a CRC operation) on the one or more first decoding paths.
  • each decoding path may include both payload bits and CRC bits.
  • UE 115-b may extract the payload bits and the CRC bits, and may perform the CRC operation on the payload bits based on the values of the CRC bits. If a decoding path passes the error check, UE 115-b may identify the set of information bits corresponding to this decoding path based on the successful EDC operation. However, in other cases, UE 115-b may decode that the EDC operation fails for each decoding path of the one or more first decoding paths.
  • UE 115-b may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits (i.e., K 2 ) that is less than the first number of information bits, K 1 .
  • these second decoding paths may test whether the codeword transmitted by base station 105-b contains K 2 information bits.
  • UE 115-b may perform this extraction procedure if the set of bit channels of the decoding candidate for the second number of information bits, K 2 , is a subset of the set of bit channels for the decoding candidate for the first number of information bits, K 1 .
  • UE 115-b may determine to extract the second decoding paths based on an SNR loss threshold. For example, UE 115-b may calculate an estimated SNR loss for the extracting based on an SNR loss threshold.
  • UE 115-b may perform a second EDC operation (e.g., a CRC operation) on each decoding path of the one or more second decoding paths. In some cases, UE 115-b may determine that the second EDC operation fails for each decoding path of the one or more second decoding paths. In some examples, at 540, UE 115-b may extract, from the one or more first decoding paths, one or more third decoding paths with respective lengths equal to a third number of information bits (e.g., K 3 ) that is less than the first number of information bits, K 1 . K 3 may be less than or greater than K 2 .
  • K 3 may be less than or greater than K 2 .
  • UE 115-b may perform a third EDC operation on each decoding path of these one or more third decoding paths.
  • UE 115-b may continue the extraction process for testing any number of possible information bit sizes for the codeword, up to a number of information bits K J .
  • UE 115-b may extract and check the multiple information bit sizes in parallel. For example, UE 115-b may perform error checking on the decoding paths for K 1 to K J in parallel during a same time period and may determine a successful decoding path if any path for any of the information bit sizes passes the EDC operation.
  • UE 115-b may perform a second decoding process on the decoding candidate according to the second number of information bits, K 2 . In some cases, UE 115-b may perform this second decoding process based on the second EDC operation for the one or more second decoding paths failing. In other cases, UE 115-b may extract and check multiple information bit sizes (e.g., up to K J ) , and UE 115-b may perform the second decoding process if no decoding paths pass the error check for any of these information bit sizes. By performing the extraction process first, UE 115-b may support reducing processing overhead and decoding latency if any extracted decoding path passes the EDC. However, by performing the second decoding process in cases where no extracted decoding path passes EDC, UE 115-b may not incur any SNR loss despite the enhanced decoding efficiency.
  • K J the second number of information bits
  • UE 115-b may identify, based on determining that the second EDC operation (or, more generally, the J th EDC operation) fails, that the decoding candidate was not successfully decoded. Rather than performing decoding operations according to the other information bit sizes, UE 115-b may perform another decoding process on a second decoding candidate associated with the codeword, where the first decoding candidate and the second decoding candidate correspond to a set of decoding candidates in a search space. In some cases, UE 115-b may determine whether to perform the decoding operations for the other information bit sizes (e.g., a second decoding process according to the second number of information bits, K 2 ) based on an SNR loss threshold.
  • the other information bit sizes e.g., a second decoding process according to the second number of information bits, K 2
  • UE 115-b may calculate an estimated SNR loss for the second EDC operation based on a difference between the first number of information bits and the second number of information bits and may compare the estimated SNR loss for the second EDC operation to the SNR loss threshold. If the estimated SNR loss is less than the SNR loss threshold, UE 115-b may refrain from performing the decoding process for the second number of information bits, K 2 .
  • UE 115-b may determine that the EDC operation passes for a decoding path.
  • UE 115-b may identify the information bits (e.g., the payload or DCI bits) corresponding to this decoding path, and may determine the number of information bits, K, for this decoding path as the number of information bits encoded by base station 105-b at 505.
  • FIG. 6 shows a block diagram 600 of a device 605 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the device 605 may be an example of aspects of a UE 115 or base station 105 as described herein.
  • the device 605 may include a receiver 610, a blind decoder 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) .
  • 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 enhanced efficiency for decoding multiple information bit sizes, 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 or 1020 as described with reference to FIGs. 9 and 10.
  • the receiver 610 may utilize a single antenna or a set of antennas.
  • the blind decoder 615 may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code, and may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the blind decoder 615 may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths, extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits, and perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • the blind decoder 615 may be an example of aspects of the blind decoder 910 or 1010 as described herein.
  • the blind decoder 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 blind decoder 615, or its sub-components may be executed by a general-purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • the blind decoder 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 blind decoder 615, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the blind decoder 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
  • 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 or 1020 as described with reference to FIGs. 9 and 10.
  • 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 enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the device 705 may be an example of aspects of a device 605, a UE 115, or a base station 105 as described herein.
  • the device 705 may include a receiver 710, a blind decoder 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) .
  • 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 enhanced efficiency for decoding multiple information bit sizes, 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 or 1020 as described with reference to FIGs. 9 and 10.
  • the receiver 710 may utilize a single antenna or a set of antennas.
  • the blind decoder 715 may be an example of aspects of the blind decoder 615 as described herein.
  • the blind decoder 715 may include a monitoring component 720, a polar decoding component 725, an EDC component 730, and an extraction component 735.
  • the blind decoder 715 may be an example of aspects of the blind decoder 910 or 1010 as described herein.
  • the monitoring component 720 may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code.
  • the polar decoding component 725 may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the EDC component 730 may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths.
  • the extraction component 735 may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits.
  • the EDC component 730 may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • 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 or 1020 as described with reference to FIGs. 9 and 10.
  • the transmitter 740 may utilize a single antenna or a set of antennas.
  • FIG. 8 shows a block diagram 800 of a blind decoder 805 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the blind decoder 805 may be an example of aspects of a blind decoder 615, a blind decoder 715, or a blind decoder 910 described herein.
  • the blind decoder 805 may include a monitoring component 810, a polar decoding component 815, an EDC component 820, an extraction component 825, an SNR loss threshold component 830, and an information bit identifier 835. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the monitoring component 810 may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code.
  • the set of information bits includes DCI for a PDCCH transmission.
  • the polar decoding component 815 may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the EDC component 820 may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths.
  • the extraction component 825 may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits.
  • the EDC component 820 may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • the first EDC operation and the second EDC operation are examples of CRC operations.
  • a set of bit channels of the decoding candidate for the second number of information bits is a subset of a set of bit channels of the decoding candidate for the first number of information bits.
  • the EDC component 820 may determine that the second EDC operation fails for each decoding path of the one or more second decoding paths.
  • the polar decoding component 815 may perform, based on the determining that the second EDC operation fails, a second decoding process on the decoding candidate according to the second number of information bits.
  • the polar decoding component 815 may identify, based on the determining that the second EDC operation fails, that the decoding candidate was not successfully decoded.
  • the polar decoding component 815 may perform a second decoding process on a second decoding candidate associated with the codeword based on the identifying, where the decoding candidate and the second decoding candidate correspond to a set of decoding candidates in a search space.
  • the extraction component 825 may extract, from the one or more first decoding paths, one or more third decoding paths with respective lengths equal to a third number of information bits that is less than the first number of information bits.
  • the EDC component 820 may perform a third EDC operation on each decoding path of the one or more third decoding paths.
  • the EDC component 820 may determine that the third EDC operation fails for each decoding path of the one or more third decoding paths.
  • the polar decoding component 815 may perform, based on the determining that the third EDC operation fails, a second decoding process on the decoding candidate according to the second number of information bits.
  • the decoding process may be an example of a first decoding process
  • the SNR loss threshold component 830 may determine whether to perform a second decoding process on the decoding candidate according to the second number of information bits based on the determining that the second EDC operation fails and an SNR loss threshold. For example, determining whether the to perform the second decoding process on the decoding candidate may involve the SNR loss threshold component 830 calculating an estimated SNR loss for the second EDC operation based on a difference between the first number of information bits and the second number of information bits and comparing the estimated SNR loss for the second EDC operation to the SNR loss threshold.
  • the SNR loss threshold component 830 may determine to extract the one or more second decoding paths based on an SNR loss threshold. In some examples, the SNR loss threshold component 830 may calculate an estimated SNR loss for the extracting based on a difference between the first number of information bits and the second number of information bits and may identify that the estimated SNR loss for the extracting is less than the SNR loss threshold.
  • the EDC component 820 may determine that the second EDC operation passes for a decoding path of the one or more second decoding paths.
  • the information bit identifier 835 may identify the set of information bits according to the decoding path and the second number of information bits.
  • FIG. 9 shows a diagram of a system 900 including a device 905 that supports enhanced efficiency for decoding multiple information bit sizes 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 blind decoder 910, a transceiver 920, an antenna 925, memory 930, a processor 940, and an I/O controller 950. These components may be in electronic communication via one or more buses (e.g., bus 955) .
  • buses e.g., bus 955
  • the blind decoder 910 may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code, and may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the blind decoder 910 may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths, may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits, and may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • 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 random access memory (RAM) , read-only memory (ROM) , or a combination thereof.
  • the memory 930 may store computer-readable code 935 including instructions that, when executed by a processor (e.g., the processor 940) cause the device to perform various functions described herein.
  • a processor e.g., the processor 940
  • the memory 930 may contain, among other things, a basic input/output system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • BIOS basic input/output system
  • the processor 940 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a central processing unit (CPU) , a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • 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 enhanced efficiency for decoding multiple information bit sizes) .
  • the I/O controller 950 may manage input and output signals for the device 905.
  • the I/O controller 950 may also manage peripherals not integrated into the device 905.
  • the I/O controller 950 may represent a physical connection or port to an external peripheral.
  • the I/O controller 950 may utilize an operating system such as or another known operating system.
  • the I/O controller 950 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 950 may be implemented as part of a processor.
  • a user may interact with the device 905 via the I/O controller 950 or via hardware components controlled by the I/O controller 950.
  • 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 diagram of a system 1000 including a device 1005 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the device 1005 may be an example of or include the components of device 605, device 705, or a base station 105 as described herein.
  • the device 1005 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a blind decoder 1010, a network communications manager 1015, a transceiver 1020, an antenna 1025, memory 1030, a processor 1040, and an inter-station communications manager 1045. These components may be in electronic communication via one or more buses (e.g., bus 1055) .
  • buses e.g., bus 1055
  • the blind decoder 1010 may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code, and may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the blind decoder 1010 may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths, may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits, and may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • Network communications manager 1015 may manage communications with the core network 130 (e.g., via one or more wired backhaul links) .
  • the network communications manager 1015 may manage the transfer of data communications for client devices, such as one or more UEs 115.
  • Transceiver 1020 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1020 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1020 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 1025. However, in some cases the device may have more than one antenna 1025, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 1030 may include RAM, ROM, or a combination thereof.
  • the memory 1030 may store computer-readable code 1035 including instructions that, when executed by a processor (e.g., the processor 1040) cause the device to perform various functions described herein.
  • a processor e.g., the processor 1040
  • the memory 1030 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 1040 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 1040 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 1040.
  • the processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting enhanced efficiency for decoding multiple information bit sizes) .
  • Inter-station communications manager 1045 may manage communications with other base station 105 and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communications manager 1045 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, inter-station communications manager 1045 may provide an X2 interface within an LTE/LTE-A wireless communication network technology to provide communication between base stations 105.
  • the code 1035 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1035 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1035 may not be directly executable by the processor 1040 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 11 shows a flowchart illustrating a method 1100 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the operations of method 1100 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1100 may be performed by a blind decoder as described with reference to FIGs. 6 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code.
  • the operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a monitoring component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a polar decoding component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths.
  • the operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits.
  • the operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be performed by an extraction component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • the operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • FIG. 12 shows a flowchart illustrating a method 1200 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the operations of method 1200 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1200 may be performed by a blind decoder as described with reference to FIGs. 6 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code.
  • the operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed by a monitoring component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed by a polar decoding component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths.
  • the operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits.
  • the operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be performed by an extraction component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • the operations of 1225 may be performed according to the methods described herein. In some examples, aspects of the operations of 1225 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that the second EDC operation fails for each decoding path of the one or more second decoding paths.
  • the operations of 1230 may be performed according to the methods described herein. In some examples, aspects of the operations of 1230 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform, based on determining that the second EDC operation fails, a second decoding process on the decoding candidate according to the second number of information bits.
  • the operations of 1235 may be performed according to the methods described herein. In some examples, aspects of the operations of 1235 may be performed by a polar decoding component as described with reference to FIGs. 6 through 10.
  • FIG. 13 shows a flowchart illustrating a method 1300 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the operations of method 1300 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1300 may be performed by a blind decoder as described with reference to FIGs. 6 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code.
  • the operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed by a monitoring component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • the operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed by a polar decoding component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths.
  • the operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits.
  • the operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed by an extraction component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • the operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that the second EDC operation fails for each decoding path of the one or more second decoding paths.
  • the operations of 1330 may be performed according to the methods described herein. In some examples, aspects of the operations of 1330 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may identify, based on determining that the second EDC operation fails, that the decoding candidate was not successfully decoded.
  • the operations of 1335 may be performed according to the methods described herein. In some examples, aspects of the operations of 1335 may be performed by a polar decoding component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a second decoding process on a second decoding candidate associated with the codeword based on the identifying, where the decoding candidate and the second decoding candidate correspond to a set of decoding candidates in a search space.
  • the operations of 1340 may be performed according to the methods described herein. In some examples, aspects of the operations of 1340 may be performed by a polar decoding component as described with reference to FIGs. 6 through 10.
  • FIG. 14 shows a flowchart illustrating a method 1400 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the operations of method 1400 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1400 may be performed by a blind decoder as described with reference to FIGs. 6 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code.
  • 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 monitoring component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • 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 polar decoding component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths.
  • 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 an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits.
  • 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 an extraction component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • the operations of 1425 may be performed according to the methods described herein. In some examples, aspects of the operations of 1425 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that the second EDC operation fails for each decoding path of the one or more second decoding paths.
  • the operations of 1430 may be performed according to the methods described herein. In some examples, aspects of the operations of 1430 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may extract, from the one or more first decoding paths (or the one or more second decoding paths) , one or more third decoding paths with respective lengths equal to a third number of information bits that is less than the first number of information bits (and/or the second number of information bits) .
  • the operations of 1435 may be performed according to the methods described herein. In some examples, aspects of the operations of 1435 may be performed by an extraction component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a third EDC operation on each decoding path of the one or more third decoding paths.
  • the operations of 1440 may be performed according to the methods described herein. In some examples, aspects of the operations of 1440 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • FIG. 15 shows a flowchart illustrating a method 1500 that supports enhanced efficiency for decoding multiple information bit sizes in accordance with aspects of the present disclosure.
  • the operations of method 1500 may be implemented by a UE 115 or base station 105 or its components as described herein.
  • the operations of method 1500 may be performed by a blind decoder as described with reference to FIGs. 6 through 10.
  • a UE or base station may execute a set of instructions to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, a UE or base station may perform aspects of the functions described below using special-purpose hardware.
  • the UE or base station may receive a decoding candidate associated with a codeword, the codeword corresponding to a set of information bits encoded using a polar code.
  • 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 monitoring component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a decoding process on the decoding candidate according to a first number of information bits, where the decoding process results in one or more first decoding paths with respective lengths equal to the first number of information bits.
  • 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 polar decoding component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that a first EDC operation fails for each decoding path of the one or more first decoding paths.
  • 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 an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may extract, from the one or more first decoding paths, one or more second decoding paths with respective lengths equal to a second number of information bits that is less than the first number of information bits.
  • 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 an extraction component as described with reference to FIGs. 6 through 10.
  • the UE or base station may perform a second EDC operation on each decoding path of the one or more second decoding paths.
  • the operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may determine that the second EDC operation passes for a decoding path of the one or more second decoding paths.
  • the operations of 1530 may be performed according to the methods described herein. In some examples, aspects of the operations of 1530 may be performed by an EDC component as described with reference to FIGs. 6 through 10.
  • the UE or base station may identify the set of information bits according to the decoding path and the second number of information bits.
  • the operations of 1535 may be performed according to the methods described herein. In some examples, aspects of the operations of 1535 may be performed by an information bit identifier as described with reference to FIGs. 6 through 10.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • a CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA) , etc.
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • IS-2000 Releases may be commonly referred to as CDMA2000 1X, 1X, etc.
  • IS-856 TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD) , etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • a TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB) , Evolved UTRA (E-UTRA) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, etc.
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS) .
  • LTE, LTE-A, and LTE-A Pro are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from the organization named “3rd Generation Partnership Project” (3GP
  • CDMA2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • 3GPP2 3rd Generation Partnership Project 2
  • the techniques described herein may be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. While aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR applications.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell may be associated with a lower-powered base station, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed, etc. ) frequency bands as macro cells.
  • Small cells may include pico cells, femto cells, and micro cells according to various examples.
  • a pico cell for example, may cover a small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • An eNB for a macro cell may be referred to as a macro eNB.
  • An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB.
  • An eNB may support one or multiple (e.g., two, three, four, and the like) cells, and may also support communications using one or multiple component carriers.
  • the wireless communications systems described herein may support synchronous or asynchronous operation.
  • the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time.
  • the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.
  • the techniques described herein may be used for either synchronous or asynchronous operations.
  • 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 conventional 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 can 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 can be accessed by a general purpose or special purpose computer.
  • non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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Abstract

L'invention concerne des procédés, des systèmes, et des dispositifs pour les communications sans fil. Dans certains systèmes, un dispositif sans fil peut effectuer une détection aveugle pour tenter de recevoir et de décoder une transmission codée polaire avec des paramètres de transmission inconnus. Le dispositif peut recevoir un candidat de décodage pour un mot de code et peut tenter de décoder le candidat en fonction d'un premier nombre de bits d'informations. Si une vérification de détection d'erreur (EDC) échoue pour les chemins de décodage résultant de la présente tentative de décodage, le dispositif sans fil peut extraire, à partir des chemins de décodage, des trajets de décodage supplémentaires d'une longueur plus courte. Les présents trajets extraits peuvent correspondre à un second nombre de bits d'informations plus petits que le premier nombre de bits d'informations. Le dispositif peut effectuer une EDC sur lesdits trajets extraits pour déterminer si un trajet quelconque correspond au mot de code décodé avec succès. La présente procédure prend en charge la réduction du nombre de processus de décodage nécessaires pour tester différentes tailles de bits d'informations pour un mot de code.
PCT/CN2018/112596 2018-10-30 2018-10-30 Efficacité améliorée pour décoder de multiples tailles de bits d'informations WO2020087259A1 (fr)

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WO2017209837A1 (fr) * 2016-06-01 2017-12-07 Qualcomm Incorporated Construction généralisée de code polaire
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WO2017209837A1 (fr) * 2016-06-01 2017-12-07 Qualcomm Incorporated Construction généralisée de code polaire
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