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公开(公告)号：US20150372695A1
公开(公告)日：2015-12-24
申请号：US14766740
申请日：2013-03-14
Applicant: Jian LI , Changlong XU , Yisheng XUE , Jilei HOU , Yin HUANG , QUALCOMM INCORPORATED
Inventor： Jian Li , Changlong Xu , Yisheng Xue , Jilei Hou , Yin Huang
CPC classification number: H03M13/1131 , H04L1/0045 , H04L1/005 , H04L1/0057
Abstract: A method of error correction using low density parity check (LDPC) codes is disclosed. A communications device receives a codeword and detects one or more bit errors in the received codeword using an LDPC code. The device then generates a corrected codeword based, at least in part, on a set of unsatisfied check nodes of the LDPC code. The device may determine that the one or more bit errors are associated with an absorption set of the LDPC code. The device may also determine a plurality of candidate codewords based on the set of unsatisfied check node and select the corrected codeword from the plurality of candidate codewords. Each of the plurality of candidate codewords may represent a valid codeword associated with the LDPC code.
Abstract translation: 公开了一种使用低密度奇偶校验（LDPC）码的纠错方法。 通信设备接收码字，并使用LDPC码检测接收到的码字中的一个或多个比特错误。 然后，该设备至少部分地基于LDPC码的一组不满足的校验节点来生成校正码字。 设备可以确定一个或多个比特错误与LDPC码的吸收集相关联。 该设备还可以基于该不满足的校验节点集合来确定多个候选码字，并从多个候选码字中选择校正后的码字。 多个候选码字中的每一个可以表示与LDPC码相关联的有效码字。
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公开(公告)号：US12283973B2
公开(公告)日：2025-04-22
申请号：US18461809
申请日：2023-09-06
Applicant: QUALCOMM Incorporated
Inventor： Changlong Xu , Jian Li , Jilei Hou , Chao Wei
IPC: H03M13/00 , H03M13/13 , H03M13/35 , H04B17/336 , H04L1/00 , H04L1/1812
Abstract: Methods and apparatus for constructing polar codes are provided. A transmitter determines at least one set of parameters corresponding to data to be transmitted, and a set of sorting indices corresponding to bits of the data to be transmitted based on the set of parameters, the set of sorting indices indicating a position set of the bits to be transmitted. The transmitter polar encodes the data based at least on the set of parameters and the set of sorting indices to generate a coded block of the data, and transmits the coded block of the data.
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公开(公告)号：US20240406052A1
公开(公告)日：2024-12-05
申请号：US18694309
申请日：2021-12-01
Applicant: QUALCOMM INCORPORATED
Inventor： Kexin Xiao , Liangming Wu , Changlong Xu , Wei Liu , Jian Li , Kangqi Liu , Hao Xu
Abstract: Methods, systems, and devices for scrambling for probabilistic constellation schemes (PCSs) in wireless communications are described. In some examples, a first wireless device may scramble a set of amplitude information bits associated with a transport block for transmission to a second wireless device. In such examples, the first wireless device may perform a distribution matching procedure on the scrambled set of amplitude information bits. The first wireless device may encode the set of distributed amplitude bits and, in some cases, may perform a modulation procedure on the encoded set of distributed amplitude bits in accordance with a PCS scheme to obtain a codeword associated with the transport block. In some examples, the first wireless device may transmit the codeword to the second wireless device.
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公开(公告)号：US12069699B2
公开(公告)日：2024-08-20
申请号：US18067500
申请日：2022-12-16
Applicant: QUALCOMM Incorporated
Inventor： Liangming Wu , Kangqi Liu , Changlong Xu , Jian Li , Hao Xu
IPC: H04L1/02 , H04B7/0413 , H04L1/16 , H04W72/23 , H04W72/30
CPC classification number: H04W72/30 , H04B7/0413 , H04L1/16 , H04W72/23
Abstract: Methods, systems, and devices for wireless communications are described. A base station may transmit an encoded transmission via a broadcast to multiple user equipment (UE). Subsequently, the multiple UEs may transmit assistance information to the base station based on attempting to decode the broadcasted encoded transmission. If the decoding is unsuccessful for at least one UE, the base station may then transmit an additional encoded transmission via a unicast or multicast message to the UEs that were unsuccessful. Additionally, the base station may transmit configuration information for the multiple UEs to receive the encoded transmissions and to transmit the assistance information. For example, the configuration information may include portion information for how long the encoded transmission is transmitted via the broadcast, via the unicast, when to transmit the assistance information, etc. In some cases, the configuration information may be based on UE metrics of the multiple UEs.
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公开(公告)号：US12034534B2
公开(公告)日：2024-07-09
申请号：US18187255
申请日：2023-03-21
Applicant: QUALCOMM Incorporated
Inventor： Changlong Xu , Jian Li , Chao Wei , Jing Jiang , Jilei Hou
CPC classification number: H04L1/0058 , G06F9/30029 , H03M13/098 , H03M13/13 , H04B7/2668 , H04L1/0046 , H04L1/0052 , H04L1/0061 , H04L1/0063 , H04W40/02
Abstract: Methods, systems, and devices for wireless communication are described for dynamic frozen bits of polar codes for early termination and performance improvement. A wireless device may receive a signal comprising a codeword encoded using a polar code. The wireless device may perform decoding of the codeword including at least: parity check of a first subset of decoding paths for making a decision on early termination of decoding of the codeword based on dynamic frozen bits, and generating path metrics for a second subset of the decoding paths that each pass the parity check based on the dynamic frozen bits, and performing error detection on a bit sequence corresponding to one of the second subset of the decoding paths based at part on error detection bits and the generated path metrics. The wireless device may process the information bits based on a result of the decoding.
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Patent Agency Ranking
66.发明公开公开(公告)号：US20240147467A1
公开(公告)日：2024-05-02
申请号：US18546045
申请日：2021-04-19
Applicant: QUALCOMM Incorporated
Inventor： Miao Fu , Yan Wang , Aimin Shang , Hao Zhang , Jian Li , Xuefeng Chen , Wei He , Zhongliang Fang , Pan Jiang
IPC: H04W72/1268 , H04W74/0833
CPC classification number: H04W72/1268 , H04W74/0833
Abstract: An apparatus for wireless communication includes a receiver configured to receive a request for data associated with an Internet-of-things (IoT) service session with an IoT cloud server. The apparatus further includes a transmitter configured to transmit, based on receiving the request and prior to transmitting a response to the request, a message indicating a timing parameter associated with availability of the data. The receiver is further configured to receive an uplink grant at a time that is based on the timing parameter, and the transmitter is further configured to transmit the response to the request based on the uplink grant. The response includes at least a subset of the data.
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公开(公告)号：US20230354112A1
公开(公告)日：2023-11-02
申请号：US17914752
申请日：2020-05-23
Applicant: QUALCOMM Incorporated
Inventor： Hao Zhang , Chaofeng Hui , Fojian Zhang , Jian Li , Tianya Lin , Mingyan Wang , Jun Deng , Peng Wu
CPC classification number: H04W36/0058 , H04W36/38
Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may avoid frequent handover in small cells by triggering handover to a macro cell. The UE may determine that the UE performs a number of handovers within a time period. The UE may determine to trigger a handover to the macro cell. The UE may identify the macro cell based on measuring the macro cell during multiple handovers. The UE may determine to refrain from indicating signal measurements of small cells in a measurement report. Accordingly, a measurement report may include a signal measurement of the macro cell and omit the signal measurements of the small cells. The UE may transmit the measurement report to the small cell acting as a serving cell for the UE. Based the measurement report, the UE may receive a message initiating a handover procedure with the macro cell.
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公开(公告)号：US20230262735A1
公开(公告)日：2023-08-17
申请号：US18067500
申请日：2022-12-16
Applicant: QUALCOMM Incorporated
Inventor： Liangming Wu , Kangqi Liu , Changlong Xu , Jian Li , Hao Xu
IPC: H04W72/30 , H04W72/23 , H04B7/0413 , H04L1/16
CPC classification number: H04W72/30 , H04W72/23 , H04B7/0413 , H04L1/16
Abstract: Methods, systems, and devices for wireless communications are described. A base station may transmit an encoded transmission via a broadcast to multiple user equipment (UE). Subsequently, the multiple UEs may transmit assistance information to the base station based on attempting to decode the broadcasted encoded transmission. If the decoding is unsuccessful for at least one UE, the base station may then transmit an additional encoded transmission via a unicast or multicast message to the UEs that were unsuccessful. Additionally, the base station may transmit configuration information for the multiple UEs to receive the encoded transmissions and to transmit the assistance information. For example, the configuration information may include portion information for how long the encoded transmission is transmitted via the broadcast, via the unicast, when to transmit the assistance information, etc. In some cases, the configuration information may be based on UE metrics of the multiple UEs.
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公开(公告)号：US11171672B2
公开(公告)日：2021-11-09
申请号：US16471388
申请日：2018-01-16
Applicant: Jian Li , Changlong Xu , Chao Wei , Jilei Hou , Jing Jiang , QUALCOMM Incorporated
Inventor： Jian Li , Changlong Xu , Chao Wei , Jilei Hou , Jing Jiang
Abstract: Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to methods and apparatus for dynamic frozen polar codes, for example, for control channels. An exemplary method may be performed at the encoder. The method generally includes encoding a stream of bits using a polar code. The encoding includes selecting a first set of channel indices for encoding information bits. The encoding includes selecting a second set of the channel indices smaller than a channel index for a first information bit for encoding fixed frozen bits. The encoding includes selecting remaining channel indices for dynamic frozen (PCF) bits having values based on one or more of the information bits. The method includes transmitting the encoded stream of bits.
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公开(公告)号：US11057151B2
公开(公告)日：2021-07-06
申请号：US16487050
申请日：2017-12-14
Applicant: QUALCOMM Incorporated , Yang Yang , Jing Jiang , Gabi Sarkis , Chao Wei , Jian Li , Changlong Xu , Hari Sankar , Joseph Binamira Soriaga
Inventor： Yang Yang , Jing Jiang , Gabi Sarkis , Chao Wei , Jian Li , Changlong Xu , Hari Sankar , Joseph Binamira Soriaga
Abstract: Methods, systems, and devices for wireless communication are described for mutual information based polar code construction. A wireless device may receive a codeword over a wireless channel, the codeword encoded using a polar code. The wireless device may identify a set of bit locations of the polar code corresponding to information bits of an encoded information bit vector. The set of bit locations may be determined based at least in part on a reliability order of the bit locations of the polar code, and the reliability order may be determined based at least in part on a recursive model that includes at least one mutual information transfer function that is applied at each polarization stage of multiple polarization stages of the polar code. The wireless device may decode the received codeword to obtain the information bit vector at the set of bit locations.
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