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公开(公告)号：US11196444B2
公开(公告)日：2021-12-07
申请号：US16760758
申请日：2018-09-21
Applicant: QUALCOMM Incorporated
Inventor： Kai Chen , Liangming Wu , Changlong Xu , Jing Jiang , Hao Xu
Abstract: Certain aspects of the present disclosure generally relate to techniques for encoding and decoding bits of information using cyclic redundancy check (CRC) concatenated polar encoding and decoding. The CRC concatenated polar encoding techniques may avoid transmission of dummy bits. A method generally includes obtaining the bits of information to be transmitted. The method includes performing CRC outer encoding of the bits of information using an even-weighted generator polynomial to produce CRC encoded bits. The method includes performing polar inner encoding of the CRC encoded bits to generate a codeword. The method includes discarding a first code bit at a beginning of the codeword. The shortened codeword is transmitted over a wireless medium. In another method, bit-level scrambling is performed on the CRC encoded bits before the polar encoding to avoid generating a dummy bit. In another method, only odd-weighted generator polynomials are selected to avoid generating the dummy bit.
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公开(公告)号：US11646828B2
公开(公告)日：2023-05-09
申请号：US17045371
申请日：2019-04-04
Applicant: Qualcomm Incorporated , Jian Li , Changlong Xu , Jing Jiang , Kai Chen , Liangming Wu , Hao Xu
Inventor： Jian Li , Changlong Xu , Jing Jiang , Kai Chen , Liangming Wu , Hao Xu
IPC: H04L1/18 , H04L1/00 , H04L1/1812
CPC classification number: H04L1/1812 , H04L1/0041 , H04L1/0045 , H04L1/0057 , H04L1/0063 , H04L1/0067
Abstract: Methods, systems, and devices for wireless communications are described. In some wireless communications systems, devices (e.g., base stations, user equipment (UEs), etc.) may utilize polar coding along with hybrid automatic repeat request (HARQ) techniques. In these systems, a device may encode bits for transmission by mapping information and parity check bits to a first set of polarized bit channels of a polar code. If this transmission is not successfully received at a decoding device, the encoding device may generate a HARQ retransmission. The device may copy information bits to a second set of polarized bit channels of a second polar code containing the first polar code and may assign parity check bits to the second set of bit channels for the copied information bits. These additional parity check bits for the repeated information bits may increase transmission reliability and may support improved early termination at the decoding device.
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公开(公告)号：US20220360366A1
公开(公告)日：2022-11-10
申请号：US17866168
申请日：2022-07-15
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：US11343015B2
公开(公告)日：2022-05-24
申请号：US16772128
申请日：2019-01-10
Applicant: QUALCOMM Incorporated
Inventor： Kai Chen , Liangming Wu , Changlong Xu , Hao Xu
IPC: H04L25/00 , H04L1/00 , H04B7/0413
Abstract: Certain aspects of the present disclosure relate to methods and apparatus for channel-war polar code construction.
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公开(公告)号：US20210377917A1
公开(公告)日：2021-12-02
申请号：US16772736
申请日：2017-12-13
Applicant: Changlong XU , Uiangming WU , Kai CHEN , Hao XU , Jing JIANG , Jing SUN , Joseph Binamira SORIAGA , Qualcomm Incorporated
Inventor： Changlong Xu , Liangrning Wu , Kai Chen , Hao Xu , Jing Jiang , Jing Sun , Joseph Binamira Soriaga
Abstract: Methods, systems, and devices for wireless communications are described. A wireless device such as a user equipment (UE) may monitor a search space of a control channel for at least one downlink transmission. The UE may perform a plurality of decoding operations on a plurality of decoding candidates associated with the downlink control information format transmitted in a plurality of transmission time intervals (TTIs). In some cases, the plurality of decoding operations may comprise performing a first decoding on a first decoding candidate received in a current TTI, the first decoding operation applying a first descrambling code to the first decoding candidate, and performing a second decoding operation on a combined decoding candidate that comprises soft combined information from the first and second decoding candidate, the second decoding candidate received in a prior TTI.
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Patent Agency Ranking
公开(公告)号：US12074706B2
公开(公告)日：2024-08-27
申请号：US17310189
申请日：2019-01-23
Applicant: QUALCOMM Incorporated
Inventor： Kai Chen , Changlong Xu , Liangming Wu , Jian Li , Jing Jiang , Hao Xu
IPC: H04L1/08
CPC classification number: H04L1/08
Abstract: Wireless communications systems and methods related to hybrid repeat request (HARQ) with rate splitting are provided. A first wireless communication device communicates, with a second wireless communication device, a first communication signal including a plurality of information bits. The first wireless communication device determines a number of bits in the plurality of information bits to be repeated in a second communication signal based on channel capacity information. The first wireless communication device communicates, with the second wireless communication device, the second communication signal including the plurality of information bits and a repetition of a subset of the plurality of information bits, where the subset of the plurality of information bits includes the determined number of bits.
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公开(公告)号：US11791936B2
公开(公告)日：2023-10-17
申请号：US17866168
申请日：2022-07-15
Applicant: QUALCOMM Incorporated
Inventor： Kai Chen , Changlong Xu , Liangming Wu , Jian Li , Hao Xu
IPC: H04L1/00 , H03M13/13 , H03M13/00 , H04L1/1812 , H04L1/1829
CPC classification number: H04L1/0068 , H03M13/13 , H03M13/6306 , H03M13/6362 , H04L1/1819 , H04L1/1854
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：US11777645B2
公开(公告)日：2023-10-03
申请号：US16967106
申请日：2019-02-07
Applicant: QUALCOMM Incorporated
Inventor： Changlong Xu , Liangming Wu , Kai Chen , Jian Li , Hao Xu , Tingfang Ji , Joseph Binamira Soriaga , Jing Jiang
IPC: H04L1/00 , H04L1/08 , H04L1/1812
CPC classification number: H04L1/0057 , H04L1/0026 , H04L1/0041 , H04L1/0072 , H04L1/08 , H04L1/1812
Abstract: Techniques are provided for retransmission of Physical Uplink Shared Channel (PUCCH) for Ultra Reliable Low Latency Communications (URLLC). A User Equipment (UE) transmits at least one code block of a control channel, the at least one code block including Channel State Information (CSI), wherein each code block is polar encoded by assigning bit indices of the code block to bit channels in a particular order of reliabilities of the bit channels. The UE detects a trigger, and in response, retransmits at least a portion of each code block including retransmitted CSI, wherein the portion is polar encoded by assigning bit indices of the retransmitted CSI to the bit channels in the reverse order of reliabilities of the bit channels as compared to the polar encoding of the CSI.
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公开(公告)号：US11729783B2
公开(公告)日：2023-08-15
申请号：US16772736
申请日：2017-12-13
Applicant: Qualcomm Incorporated
Inventor： Changlong Xu , Liangming Wu , Kai Chen , Hao Xu , Jing Jiang , Jing Sun , Joseph Binamira Soriaga
CPC classification number: H04W72/23 , H04L1/08 , H04L5/0053
Abstract: Methods, systems, and devices for wireless communications are described. A wireless device such as a user equipment (UE) may monitor a search space of a control channel for at least one downlink transmission. The UE may perform a plurality of decoding operations on a plurality of decoding candidates associated with the downlink control information format transmitted in a plurality of transmission time intervals (TTIs). In some cases, the plurality of decoding operations may comprise performing a first decoding on a first decoding candidate received in a current TTI, the first decoding operation applying a first descrambling code to the first decoding candidate, and performing a second decoding operation on a combined decoding candidate that comprises soft combined information from the first and second decoding candidate, the second decoding candidate received in a prior TTI.
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公开(公告)号：US11539456B2
公开(公告)日：2022-12-27
申请号：US16759255
申请日：2018-11-20
Applicant: QUALCOMM Incorporated
Inventor： Changlong Xu , Kai Chen , Jing Jiang , Gabi Sarkis , Hao Xu
Abstract: Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to methods and apparatus for rate-matching a stream of bits encoded using polar codes. An exemplary method generally includes determining a target coding rate, RT, for transmitting a group of K information bits, based on a first coding rate, R1, corresponding to a first target block error rate (BLER) for a first transmission of a first redundancy version (RV) of the packet and a second coding rate, R2, corresponding to a second target BLER for a last transmission of a last RV of the packet; determining a circular buffer size, N, of a circular buffer for use in transmitting the first RV and the last RV of the packet; generating encoded information bits from the K information bits using a polar code having a mother code size of N; writing the encoded information bits to the circular buffer; determining a maximum number of retransmissions, based on a latency requirement for the packet; generating different RVs from the encoded information bits in the circular buffer, each RV based on a corresponding target BLER; and transmitting the first RV via a wireless medium.
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