# US 10,484,137 B2 · Polar code hybrid automatic repeat request method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,137 B2 - Document ID: US10484137B2 - Status: Granted - Kind: B2 - Application number: 15/719,832 - Filed: 2017-09-29 - Published: 2018-01-25 - Granted: 2019-11-19 - Earliest claimed: 2015-04-01 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Bin Li; Hui Shen; Kai Chen - Web page: https://patentgrep.com/patent/US10484137B2 ## CPC - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H03M 13/13: Linear codes - H04L 1/0041: {Arrangements at the transmitter end} - H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) ## Abstract Embodiments of the present invention provide a polar code hybrid automatic repeat request method and an apparatus. The method includes: obtaining, by a communications device, a bit sequence of retransmission information, where the bit sequence of the retransmission information includes K retransmission information bits determined from a bit sequence of first transmission information, the bit sequence of the first transmission information includes N first transmission information bits, N is a positive integer, and K is a positive integer not greater than N; performing, by the communications device, polar code encoding on the bit sequence of the retransmission information, to obtain an encoded retransmission bit sequence; and sending, by the communications device, the encoded retransmission bit sequence to another communications device. ## Claims ### Claim 1 A polar code hybrid automatic repeat request method comprising: obtaining, by a communications device, a bit sequence of retransmission information, wherein the bit sequence of the retransmission information comprises K retransmission information bits determined from a bit sequence of first transmission information, the bit sequence of the first transmission information comprises N first transmission information bits, N is a positive integer, and K is a positive integer not greater than N; performing, by the communications device, polar code encoding on the bit sequence of the retransmission information, to obtain an encoded retransmission bit sequence; and sending, by the communications device, the encoded retransmission bit sequence to another communications device. ### Claim 2 (depends on 1) The method according to claim 1, wherein the K retransmission information bits in the bit sequence of the retransmission information are arranged according to a preset order, and the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information. ### Claim 3 (depends on 1) The method according to claim 1, wherein the K retransmission information bits in the bit sequence of the retransmission information are arranged according to an order reverse to a preset order, and the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information. ### Claim 4 (depends on 1) The method according to claim 1, wherein the bit sequence of the retransmission information comprises I sequentially arranged groups, wherein retransmission information bits comprised in each of the I groups are arranged according to a preset order or arranged according to an order reverse to the preset order, the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information, and I is a positive integer not greater than K. ### Claim 5 (depends on 1) The method according to claim 1, wherein the method further comprises: receiving a retransmission parameter; and the obtaining a bit sequence of the retransmission information is: obtaining the bit sequence of the retransmission information according to the retransmission parameter. ### Claim 6 (depends on 5) The method according to claim 5, wherein the obtaining a bit sequence of the retransmission information according to the retransmission parameter is: obtaining the bit sequence of the retransmission information according to the retransmission parameter and pre-stored information, wherein the pre-stored information comprises at least one of a rule for determining the retransmission information bits or a rule for arranging the retransmission information bits. ### Claim 7 (depends on 1) The method according to claim 1, wherein the obtaining a bit sequence of the retransmission information is: obtaining the bit sequence of the retransmission information according to pre-stored information, wherein the pre-stored information comprises a rule for determining the retransmission information bits and a rule for arranging the retransmission information bits. ### Claim 8 (depends on 1) The method according to claim 1, wherein the K retransmission information bits are K bits having lowest reliability among the N first transmission information bits. ### Claim 9 A polar code encoding apparatus comprising: an obtaining circuit, configured to obtain a bit sequence of retransmission information, wherein the bit sequence of the retransmission information comprises K retransmission information bits determined from a bit sequence of first transmission information, the bit sequence of the first transmission information comprises N first transmission information bits, N is a positive integer, and K is a positive integer not greater than N; and an encoding circuit, in communication with the obtaining circuit and configured to perform polar code encoding on the bit sequence of the retransmission information that is obtained by the obtaining circuit, to obtain an encoded retransmission bit sequence. ### Claim 10 (depends on 9) The apparatus according to claim 9, wherein the K retransmission information bits in the bit sequence of the retransmission information are arranged according to a preset order, and the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information. ### Claim 11 (depends on 9) The apparatus according to claim 9, wherein the K retransmission information bits in the bit sequence of the retransmission information are arranged according to an order reverse to a preset order, and the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information. ### Claim 12 (depends on 9) The apparatus according to claim 9, wherein the bit sequence of the retransmission information comprises I sequentially arranged groups, wherein retransmission information bits comprised in each of the I groups are arranged according to a preset order or arranged according to an order reverse to the preset order, the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information, and I is a positive integer not greater than K. ### Claim 13 (depends on 9) The apparatus according to claim 9, wherein the K retransmission information bits are K bits having lowest reliability among the N first transmission information bits. ### Claim 14 (depends on 9) The apparatus according to claim 9, wherein the obtaining circuit is further configured to: obtain the bit sequence of the retransmission information according to pre-stored information, wherein the pre-stored information comprises a rule for determining the retransmission information bits and a rule for arranging the retransmission information bits. ### Claim 15 A communications apparatus comprising: a receiving circuit, configured to receive a retransmission parameter; and an obtaining circuit, in communication with the receiving circuit and configured to obtain a bit sequence of retransmission information according to the retransmission parameter received by the receiving circuit, wherein the bit sequence of the retransmission information comprises K retransmission information bits determined from a bit sequence of first transmission information, the bit sequence of the first transmission information comprises N first transmission information bits, N is a positive integer, and K is a positive integer not greater than N; and an encoding circuit, configured to perform polar code encoding on the bit sequence of the retransmission information that is obtained by the obtaining circuit, to obtain an encoded retransmission bit sequence. ### Claim 16 (depends on 15) The apparatus according to claim 15, wherein the K retransmission information bits in the bit sequence of the retransmission information are arranged according to a preset order, and the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information. ### Claim 17 (depends on 15) The apparatus according to claim 15, wherein the K retransmission information bits in the bit sequence of the retransmission information are arranged according to an order reverse to a preset order, and the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information. ### Claim 18 (depends on 15) The apparatus according to claim 15, wherein the bit sequence of the retransmission information comprises I sequentially arranged groups, wherein retransmission information bits comprised in each of the I groups are arranged according to a preset order or arranged according to an order reverse to the preset order, the preset order is the same as an arrangement order of the N bits in the bit sequence of the first transmission information, and I is a positive integer not greater than K. ### Claim 19 (depends on 15) The apparatus according to claim 15, wherein the K retransmission information bits are K bits having lowest reliability among the N first transmission information bits. ### Claim 20 (depends on 15) The apparatus according to claim 15, wherein the obtaining circuit is further configured to: obtain the bit sequence of the retransmission information according to pre-stored information, wherein the pre-stored information comprises a rule for determining the retransmission information bits and a rule for arranging the retransmission information bits. ### Claim 21 (depends on 15) The apparatus according to claim 15, wherein the obtaining circuit is further configured to: obtain the bit sequence of the retransmission information according to the retransmission parameter and pre-stored information, wherein the pre-stored information comprises at least one of a rule for determining the retransmission information bits or a rule for arranging the retransmission information bits. ### Claim 22 (depends on 15) The apparatus according to claim 15, wherein the apparatus further comprises: a transmitting circuit, configured to send the encoded retransmission bit sequence to another communications apparatus.