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公开(公告)号：US11228394B2
公开(公告)日：2022-01-18
申请号：US16765066
申请日：2018-09-24
Applicant: Kai Chen , Changlong Xu , Jing Jiang , Gabi Sarkis , Hao Xu , Qualcomm Incorporated
Inventor： Kai Chen , Changlong Xu , Jing Jiang , Gabi Sarkis , Hao Xu
Abstract: Methods, systems, and devices for wireless communications are described. In some systems, wireless devices may encode and decode transmissions using polar codes. A transmitting device may encode a payload based on a selected payload size. For example, the transmitting device may construct a bit vector including payload bits, parity bits, frozen bits, or some combination of these, and may modify the bits or the order of the bits based on the selected payload size. The device may generate a polar-encoded codeword based on this bit vector, and may transmit the polar-encoded codeword to a receiving device. The receiving device may blind decode the polar-encoded codeword, and may determine the correct payload size based on the decoded bit vector. For example, the device may perform decoding or may check decoded bits based on a payload size hypothesis, where the decoding may fail for any incorrect payload size hypothesis.
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公开(公告)号：US11146296B2
公开(公告)日：2021-10-12
申请号：US15733711
申请日：2019-04-02
Applicant: QUALCOMM Incorporated , Kai Chen , Changlong Xu , Liangming Wu , Jing Jiang , Hao Xu
Inventor： Kai Chen , Changlong Xu , Liangming Wu , Jing Jiang , Hao Xu
Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an encoding device may determine a least reliable subset of information bits included in a set of information bits that includes a predefined active set of information bits to be encoded; may determine a codeword bit to be added to a codeword based at least in part on the least reliable subset of information bits, wherein adding the codeword bit to the codeword improves reliability of the least reliable subset of information bits; may add the codeword bit to the codeword; and may transmit the codeword. Numerous other aspects are provided.
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公开(公告)号：US11646830B2
公开(公告)日：2023-05-09
申请号：US17054917
申请日：2019-05-28
Applicant: Qualcomm Incorporated
Inventor： Kai Chen , Jian Li , Changlong Xu , Liangming Wu , Hao Xu
IPC: H04L1/18 , H04L1/00 , H04L5/00 , H04L1/1812 , H04L1/1829
CPC classification number: H04L1/1819 , H04L1/0057 , H04L1/0069 , H04L1/1861 , H04L5/0051
Abstract: A device may identify that an incremental redundancy hybrid automatic repeat request (IR-HARQ) scheme is used in association with sequential transmissions of an information bit vector to or from another wireless device, where each transmission in the scheme is associated with a resource size. The device may identify a mother code length for a polar code based at least in part on an aggregate resource size associated with the sequential transmissions. The device may identify an adjusted bit index set for the polar code based at least in part on the IR-HARQ scheme. The device may transmit (or receive), for each transmission of the information bit vector, a respective subset of encoded bits generated by mapping the information bit vector to a set of polarized bit channels of the polar code in accordance with the bit index set.
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公开(公告)号：US11515889B2
公开(公告)日：2022-11-29
申请号：US16757794
申请日：2018-11-14
Applicant: QUALCOMM Incorporated
Inventor： Liangming Wu , Changlong Xu , Jing Jiang , Gabi Sarkis , Yu Zhang , Kai Chen
Abstract: Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to methods and apparatus for segmenting uplink control information prior for encoding using a polar code prior to transmission. An exemplary method that may be performed by a wireless device generally includes iteratively segmenting a group of K information bits into a plurality of segments, encoding the information bits of each of the plurality of segments using a polar code to generate a plurality of encoded segments, and transmitting the plurality of encoded segments.
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公开(公告)号：US11470598B2
公开(公告)日：2022-10-11
申请号：US17044709
申请日：2019-04-02
Applicant: QUALCOMM Incorporated
Inventor： Changlong Xu , Chao Wei , Liangming Wu , Peng Cheng , Kai Chen , Hao Xu , Tingfang Ji
Abstract: Aspects of the disclosure relate to wireless communication. In some aspects, a user equipment (UE) may receive an indicator, in a physical downlink control channel (PDCCH) payload, that indicates whether the PDCCH payload includes data or downlink control information (DCI) for obtaining the data, wherein the indicator is an initial state of a cyclic redundancy check that includes a predefined sequence of bits; and obtain at least one of the data or the DCI based at least in part on the indicator. Numerous other aspects are provided.
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Patent Agency Ranking
公开(公告)号：US11445489B2
公开(公告)日：2022-09-13
申请号：US16772656
申请日：2018-11-14
Applicant: Qualcomm Incorporated
Inventor： Changlong Xu , Kai Chen , Hao Xu , Jing Jiang , Jing Sun
Abstract: Methods, systems, and devices for wireless communications are described that provide for a location indicator transmission that may indicate a location of control channel resources that are to be monitored by a user equipment (UE) for control channel transmissions. A UE may receive the location indicator, and monitor the indicated control channel resources to receive downlink control information with an allocation of shared channel resources for the UE. The location indicator may include one or more parameters that allow a UE to receive the control channel transmissions according to a single decoding hypothesis. The location indicator may include one or more of a valid period of the location of the control channel transmissions, an interval at which control channel transmissions may be transmitted, an aggregation level used for the control channel transmissions, an index that identifies a first control channel element of the control channel transmissions, or combinations thereof.
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公开(公告)号：US11411678B2
公开(公告)日：2022-08-09
申请号：US17271746
申请日：2019-10-03
Applicant: Qualcomm Incorporated
Inventor： Kai Chen , Changlong Xu , Liangming Wu , Jian Li , Hao Xu
Abstract: Wireless devices may use polar codes for encoding transmissions and may support combining transmissions to improve decoding reliability (e.g., by achieving chase combining and incremental redundancy (IR) gains). For example, an encoding device may puncture a set of mother code bits using different puncturing patterns to obtain different redundancy versions for a first transmission and a re-transmission. Each puncturing pattern may correspond to an equivalent decoding performance. In some cases, to obtain equivalent puncture sets, the encoding device may perform punctured index manipulation procedures on an initial puncturing pattern. A punctured index manipulation procedure may involve switching a binary state for a binary bit at a same binary bit index for each puncture index in a puncturing pattern. A device may receive the transmissions generated using the equivalent puncture sets and may combine the information for improved decoding reliability.
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公开(公告)号：US11171739B2
公开(公告)日：2021-11-09
申请号：US16763304
申请日：2018-10-26
Applicant: Qualcomm Incorporated , Changlong Xu , Liangming Wu , Jian Li , Kai Chen , Jing Jiang , Gabi Sarkis , Hao Xu
Inventor： Changlong Xu , Liangming Wu , Jian Li , Kai Chen , Jing Jiang , Gabi Sarkis , Hao Xu
Abstract: Methods, systems, and devices for wireless communications are described. An encoder of a wireless device may receive a transport block (TB) for transmission and segment the transport block into a set of multiple, smaller data segments that respectively In correspond to a plurality of code blocks of the TB. The encoder may generate a code block level (CB-level) error detection code (EDC) for a subset of the data segments. The encoder may generate a transport block-level (TB-level) EDC for the TB using the data segments. Each of the code blocks (CBs) may be of the same size and may include one of the data segments. A subset of the CBs may include a data segment from the subset of the data segments and one of the CB-level EDCs. The remaining CBs that are not part of the subset may include a remaining data segments and the TB-level EDC.
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公开(公告)号：US11038624B2
公开(公告)日：2021-06-15
申请号：US16764957
申请日：2017-11-17
Applicant: Qualcomm Incorporated , Kai Chen , Changlong Xu , Jing Jiang , Gabi Sarkis , Hao Xu
Inventor： Kai Chen , Changlong Xu , Jing Jiang , Gabi Sarkis , Hao Xu
IPC: H04L1/00
Abstract: A transmitting device may identify a set of bit locations of a polar code for encoding an input vector based at least in part on a reliability order of the bit locations, where the input vector includes a set of payload bits. The transmitting device may map bits of the input vector to respective bit locations of the identified set of bit locations and may apply a masking operation to a subset of bits of the input vector that is mapped to a most reliable subset of the set of bit locations. The transmitting device may perform an encoding operation according to the mapped input vector to generate a codeword for transmission. A receiving device may perform complementary operations to obtain the payload bits of the input vector. Based on the described techniques, a false alarm rate for the receiving device may be suppressed.
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公开(公告)号：US20210050865A1
公开(公告)日：2021-02-18
申请号：US16968920
申请日：2019-02-14
Applicant: Jian LI , Changlong XU , Liangming WU , Kai CHEN , Hao XU , Jing JIANG , Joseph Binamira SORIAGA , Qualcomm Incorporated
Inventor： Jian Li , Changlong Xu , Liangming Wu , Kai Chen , Hao Xu , Jing Jiang , Joseph Binamira Soriaga
Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device, such as a base station or a user equipment (UE), may generate a first set of encoded bits using a polar code. The transmitting device may transmit the first set of encoded bits to a receiving device, but the receiving device may unsuccessfully receive the transmission. The transmitting device may prepare a retransmission by generating a second set of encoded bits. In some cases, the transmitting device may copy information bits from the first transmission to polarized channels when generating the polar code for the retransmission. The transmitting device may copy information bits based on how the information bits were assigned for the first transmission as well as the block length. The transmitting device may copy information bits such that the retransmission is self-decodable.
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