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

IPC: H04L1/00 ,  G06F9/30 ,  H03M13/09 ,  H03M13/13 ,  H04B7/26 ,  H04W40/02

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.

公开(公告)号：US11949434B2

公开(公告)日：2024-04-02

申请号：US17761262

申请日：2019-09-20

Applicant: Qualcomm Incorporated

Inventor： Changlong Xu ,  Tao Luo ,  Hao Xu

IPC: H03M13/37 ,  H04L1/00

CPC classification number: H03M13/3761 ,  H04L1/0041 ,  H04L1/0045

Abstract: Methods, systems, and devices for wireless communications are described. An encoding device (e.g., a user equipment (UE) or a base station) may divide one or more data units (e.g., packet data convergence protocol (PDCP) protocol data units (PDU)) into a set of data blocks. The encoding device may encode the set of data blocks using a fountain code and may generate a set of data units (e.g., radio link control (RLC) PDUs) based on encoding the set of data blocks using the fountain code. The UE may allocate a first subset of the set of data units to a first carrier and a second subset of the set of data units to a second carrier and may transmit the first subset over the first carrier and the second subset over the second carrier.

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.

公开(公告)号：US20230261729A1

公开(公告)日：2023-08-17

申请号：US18003576

申请日：2020-08-21

Applicant: QUALCOMM Incorporated

Inventor： Min Huang ,  Chao Wei ,  Qiaoyu Li ,  Jing Dai ,  Wei Xi ,  Chenxi Hao ,  Kangqi Liu ,  Hao Xu ,  Changlong Xu ,  Wanshi Chen

IPC: H04B7/08 ,  H04B7/06

CPC classification number: H04B7/0888 ,  H04B7/0626 ,  H04B7/0857

Abstract: Aspects of the disclosure relate to transmitting, from a user equipment (UE) to a base station, information indicative of a multicast session that the UE is interested in accessing; transmitting information indicating that a first beam of a plurality of beams is a preferred beam for receiving multicast data associated with the multicast session; receiving, from the base station, a list of at least one beam of the plurality of beams associated with the multicast session; and receiving, from the base station using a beam from the list, multicast data associated with the multicast session. Other aspects, embodiments, and features are also claimed and described.

公开(公告)号：US11677506B2

公开(公告)日：2023-06-13

申请号：US16765557

申请日：2017-11-20

Applicant: Changlong Xu ,  Hao Xu ,  Jing Jiang ,  Qualcomm Incorporated

Inventor： Changlong Xu ,  Hao Xu ,  Jing Jiang

IPC: H04L1/1812 ,  H04L1/1825 ,  H04L1/1867 ,  H04L1/1829 ,  H04L1/1803 ,  H04W76/27 ,  H04L1/20 ,  H04W72/54

CPC classification number: H04L1/1812 ,  H04L1/1803 ,  H04L1/188 ,  H04L1/1825 ,  H04L1/1848 ,  H04L1/1896 ,  H04L1/1887 ,  H04L1/203 ,  H04W72/54 ,  H04W76/27

Abstract: 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.

公开(公告)号：US20220069841A1

公开(公告)日：2022-03-03

申请号：US17522693

申请日：2021-11-09

Applicant: QUALCOMM Incorporated

Inventor： Changlong Xu ,  Shrinivas Kudekar ,  Thomas Joseph Richardson ,  Joseph Binamira Soriaga

IPC: H03M13/09 ,  H03M13/11 ,  H03M13/13 ,  H03M13/29

Abstract: Various aspects of the disclosure relate to encoding information and decoding information. In some aspects, the disclosure relates to an encoder and a decoder for Polar codes with HARQ. If a first transmission of the encoder fails, information bits associated with a lower quality channel may be retransmitted. At the decoder, the resulting decoded retransmitted bits may be used to decode the first transmission by substituting the retransmitted bits for the original corresponding (low quality channel) bits. In some aspects, to decode the first transmission, soft-combining is applied to the decoded retransmitted bits and the original corresponding (low quality channel) bits. In some aspects, CRC bits for a first transmission may be split between a first subset of bits and a second subset of bits. In this case, the second subset of bits and the associated CRC bits may be used for a second transmission (e.g., a retransmission).

公开(公告)号：US11211946B2

公开(公告)日：2021-12-28

申请号：US16336213

申请日：2017-07-11

Applicant: QUALCOMM Incorporated

Inventor： Changlong Xu ,  Shrinivas Kudekar ,  Thomas Richardson ,  Joseph Binamira Soriaga

IPC: H03M13/00 ,  H03M13/09 ,  H03M13/11 ,  H03M13/13 ,  H03M13/29 ,  H04L1/18

Abstract: Various aspects of the disclosure relate to encoding information and decoding information. In some aspects, the disclosure relates to an encoder and a decoder for Polar codes with HARQ. If a first transmission of the encoder fails, information bits associated with a lower quality channel may be retransmitted. At the decoder, the resulting decoded retransmitted bits may be used to decode the first transmission by substituting the retransmitted bits for the original corresponding (low quality channel) bits. In some aspects, to decode the first transmission, soft-combining is applied to the decoded retransmitted bits and the original corresponding (low quality channel) bits. In some aspects, CRC bits for a first transmission may be split between a first subset of bits and a second subset of bits. In this case, the second subset of bits and the associated CRC bits may be used for a second transmission (e.g., a retransmission).

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

IPC: H03M13/09 ,  H03M13/00 ,  H03M13/15 ,  H04L1/00

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.

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

IPC: H03M13/35 ,  H03M7/30 ,  H03M13/09 ,  H03M13/13 ,  H03M13/29 ,  H04L1/00

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.

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

IPC: H04L1/00 ,  G06N7/00 ,  H03M13/01 ,  H03M13/13

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.