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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
申请人： Kai Chen , Changlong Xu , Jing Jiang , Gabi Sarkis , Hao Xu , Qualcomm Incorporated
发明人： Kai Chen , Changlong Xu , Jing Jiang , Gabi Sarkis , Hao Xu
摘要： 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
申请人： QUALCOMM Incorporated , Kai Chen , Changlong Xu , Liangming Wu , Jing Jiang , Hao Xu
发明人： Kai Chen , Changlong Xu , Liangming Wu , Jing Jiang , Hao Xu
摘要： 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：US11171739B2
公开(公告)日：2021-11-09
申请号：US16763304
申请日：2018-10-26
申请人： Qualcomm Incorporated , Changlong Xu , Liangming Wu , Jian Li , Kai Chen , Jing Jiang , Gabi Sarkis , Hao Xu
发明人： Changlong Xu , Liangming Wu , Jian Li , Kai Chen , Jing Jiang , Gabi Sarkis , Hao Xu
摘要： 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
申请人： Qualcomm Incorporated , Kai Chen , Changlong Xu , Jing Jiang , Gabi Sarkis , Hao Xu
发明人： Kai Chen , Changlong Xu , Jing Jiang , Gabi Sarkis , Hao Xu
IPC分类号： H04L1/00
摘要： 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
申请人： Jian LI , Changlong XU , Liangming WU , Kai CHEN , Hao XU , Jing JIANG , Joseph Binamira SORIAGA , Qualcomm Incorporated
发明人： Jian Li , Changlong Xu , Liangming Wu , Kai Chen , Hao Xu , Jing Jiang , Joseph Binamira Soriaga
摘要： 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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公开(公告)号：US20200313802A1
公开(公告)日：2020-10-01
申请号：US16765557
申请日：2017-11-20
申请人： Changlong XU , Hao XU , Jing JIANG , Qualcomm Incorporated
发明人： Changlong Xu , Hao Xu , Jing Jiang
摘要： Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support hybrid automatic repeat request (HARQ) schemes to improve the likelihood that information is received correctly over a wireless communications link. In HARQ, when a transmitting device determines that a receiving device failed to successfully decode a transmission of information, the transmitting device may retransmit the information to the receiving device. In some cases, HARQ techniques may be used for communications associated with different types of services. In such cases, to keep the latency of communications within a latency budget for a particular type of service, wireless devices may utilize the techniques described herein to dynamically terminate HARQ retransmissions. For instance, a transmitting device may avoid retransmitting information when an amount of time that has elapsed since an original transmission of the information has exceeded the latency budget.
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公开(公告)号：US11677506B2
公开(公告)日：2023-06-13
申请号：US16765557
申请日：2017-11-20
申请人： Changlong Xu , Hao Xu , Jing Jiang , Qualcomm Incorporated
发明人： Changlong Xu , Hao Xu , Jing Jiang
IPC分类号： H04L1/1812 , H04L1/1825 , H04L1/1867 , H04L1/1829 , H04L1/1803 , H04W76/27 , H04L1/20 , H04W72/54
CPC分类号： H04L1/1812 , H04L1/1803 , H04L1/188 , H04L1/1825 , H04L1/1848 , H04L1/1896 , H04L1/1887 , H04L1/203 , H04W72/54 , H04W76/27
摘要： Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support hybrid automatic repeat request (HARQ) schemes to improve the likelihood that information is received correctly over a wireless communications link. In HARQ, when a transmitting device determines that a receiving device failed to successfully decode a transmission of information, the transmitting device may retransmit the information to the receiving device. In some cases, HARQ techniques may be used for communications associated with different types of services. In such cases, to keep the latency of communications within a latency budget for a particular type of service, wireless devices may utilize the techniques described herein to dynamically terminate HARQ retransmissions. For instance, a transmitting device may avoid retransmitting information when an amount of time that has elapsed since an original transmission of the information has exceeded the latency budget.
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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
申请人： Qualcomm Incorporated , Jian Li , Changlong Xu , Jing Jiang , Kai Chen , Liangming Wu , Hao Xu
发明人： Jian Li , Changlong Xu , Jing Jiang , Kai Chen , Liangming Wu , Hao Xu
IPC分类号： H04L1/18 , H04L1/00 , H04L1/1812
CPC分类号： H04L1/1812 , H04L1/0041 , H04L1/0045 , H04L1/0057 , H04L1/0063 , H04L1/0067
摘要： 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：US20210377917A1
公开(公告)日：2021-12-02
申请号：US16772736
申请日：2017-12-13
申请人： Changlong XU , Uiangming WU , Kai CHEN , Hao XU , Jing JIANG , Jing SUN , Joseph Binamira SORIAGA , Qualcomm Incorporated
发明人： Changlong Xu , Liangrning Wu , Kai Chen , Hao Xu , Jing Jiang , Jing Sun , Joseph Binamira Soriaga
摘要： 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：US20200099469A1
公开(公告)日：2020-03-26
申请号：US16467463
申请日：2017-12-07
申请人： Jing JIANG , Gabi SARKIS , Yang YANG , Shrinivas KUDEK , Josph Binamira SORIAGA , Hari SANKAR , Changlong XU , Chao WEI , Shrinivas KUDEKAR , Qualcomm Incorporated
发明人： Jing Jiang , Gabi Sarkis , Yang Yang , Shrinivas Kudekar , Joseph Binamira Soriaga , Hari Sankar , Changgiong Xu , Chao Wei
IPC分类号： H04L1/00
摘要： Methods, systems, and devices for encoding and decoding are described. To encode a vector, an encoder allocates information bits of the vector to channel instances of a channel that are separated into groups. The groups may vary in size and allocation of the information bits is based on a base sequence of a given length. During decoding, a decoder assigns different bit types to channels instances by dividing a codeword into a plurality of groups and assigning bit types to channel instances of the plurality of groups using the base sequence.
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