# US 10,375,600 B2 · Data retransmission method, device, and system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,375,600 B2 - Document ID: US10375600B2 - Status: Granted - Kind: B2 - Application number: 15/556,072 - Filed: 2015-04-09 - Published: 2018-07-26 - Granted: 2019-08-06 - Earliest claimed: 2015-04-09 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xiaocui Li; Jian Wang; Da Wang - Web page: https://patentgrep.com/patent/US10375600B2 ## CPC - H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 28/04: Error control - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A data retransmission method includes transmitting, by a first device, data to a second device by using a first carrier. The first carrier is an unlicensed carrier. The method additionally includes retransmitting, by the first device, the data to the second device by using a second carrier. The first carrier and the second carrier are different carriers. The method additionally includes sending, by the first device, control signaling to the second device. The control signaling is used to indicate the data. ## Claims ### Claim 1 A data retransmission method, comprising: transmitting, by a first device and using a first unlicensed carrier, data to a second device; retransmitting, by the first device and using a second unlicensed carrier that is different than the first unlicensed carrier, the data to the second device; and subsequent to transmitting the data using the first unlicensed carrier, sending, to the second device by the first device via the second unlicensed carrier, control signaling used to indicate the data, wherein the control signaling includes a modulation and coding scheme (MCS) field that indicates a modulation scheme for the data retransmitted via the second unlicensed carrier and that the data is retransmitted via the second unlicensed carrier, wherein the MCS field can be populated with any one of 32 possible values, wherein a first plurality of sequential values of the MCS field in the range of [0, 31−N] corresponds to a first predetermined modulation scheme, wherein a second plurality of sequential values of the MCS field in the range of [0, 31−N] corresponds to a second predetermined modulation scheme, wherein each of the first plurality of sequential values corresponds to a respective carrier of a plurality of carriers according to a sequence, wherein each of the second plurality of sequential values corresponds to a respective carrier of the plurality of carriers according to the sequence such that a first value in the first plurality of sequential values and a first value in the second plurality of sequential values correspond to a first predetermined carrier, and such that a second value in the first plurality of sequential values and a second value in the second plurality of sequential values correspond to a second predetermined carrier. ### Claim 2 (depends on 1) The method of claim 1, wherein when a value of the MCS field is any value in [0, 31−N], the MCS field is used to indicate the data, and wherein N is a quantity of preset modulation schemes and is a positive integer. ### Claim 3 (depends on 2) The method of claim 2, wherein in all values in [0, 31−N], N1 values are used to indicate a first modulation scheme, Ni values are used to indicate an ith modulation scheme, ∑ i = 1 N ⁢ N i = 32 - N , Ni is a positive integer, and each of the Ni values is used to indicate a carrier number. ### Claim 4 (depends on 1) The method of claim 1, wherein the control signaling comprises a carrier indicator field (CIF) used to indicate the data. ### Claim 5 (depends on 4) The method of claim 4, wherein each value is used to indicate a modulation scheme of N preset modulation schemes, and N is a positive integer. ### Claim 6 A data retransmission method, comprising: receiving, by a second device via a first unlicensed carrier, first data from a first device; receiving, by the second device via a second unlicensed carrier that is different than the first unlicensed carrier, retransmitted data from the first device, the retransmitted data corresponding to the first data; and subsequent to receiving the first data via the first unlicensed carrier, receiving, by the second device from the first device via the second unlicensed carrier, control signaling used to indicate the retransmitted data, wherein the control signaling includes a modulation and coding scheme (MCS) field that indicates a modulation scheme for the data retransmitted via the second unlicensed carrier and that the data is retransmitted via the second unlicensed carrier, wherein the MCS field can be populated with any one of 32 possible values, wherein a first plurality of sequential values of the MCS field in the range of [0, 31−N] corresponds to a first predetermined modulation scheme, wherein a second plurality of sequential values of the MCS field in the range of [0, 31−N] corresponds to a second predetermined modulation scheme, wherein each of the first plurality of sequential values corresponds to a respective carrier of a plurality of carriers according to a sequence, wherein each of the second plurality of sequential values corresponds to a respective carrier of the plurality of carriers according to the sequence such that a first value in the first plurality of sequential values and a first value in the second plurality of sequential values correspond to a first predetermined carrier, and such that a second value in the first plurality of sequential values and a second value in the second plurality of sequential values correspond to a second predetermined carrier. ### Claim 7 (depends on 6) The method of claim 6, wherein the MCS field is used to indicate the data, and wherein N is a quantity of preset modulation schemes and is a positive integer. ### Claim 8 (depends on 7) The method of claim 7, wherein in all values in [0, 31−N], N1 values are used to indicate a first modulation scheme, Ni values are used to indicate an ith modulation scheme, ∑ i = 1 N ⁢ N i = 32 - N , Ni is a positive integer, and each of the Ni values is used to indicate a carrier number. ### Claim 9 (depends on 6) The method of claim 6, wherein the control signaling comprises a carrier indicator field (CIF) used to indicate the data. ### Claim 10 A first device, comprising: a processor; a memory; a bus; and a transmitter, the processor, the memory, and the transmitter being connected to, and being configured to communicate with, each other using the bus, and the processor being configured to: transmit, using the transmitter, data to a second device using a first unlicensed carrier; retransmit, using the transmitter, the data to the second device using a second unlicensed carrier that is different than the first unlicensed carrier; and send, to the second device via the second unlicensed carrier and subsequent to the transmission of the data using the first unlicensed carrier, control signaling used to indicate the data, wherein the control signaling includes a modulation and coding scheme (MCS) field that indicates a modulation scheme for the data retransmitted via the second unlicensed carrier and that the data is retransmitted via the second unlicensed carrier, wherein the MCS field can be populated with any one of 32 possible values, wherein a first plurality of sequential values of the MCS field in the range of [0, 31−N] corresponds to a first predetermined modulation scheme, wherein a second plurality of sequential values of the MCS field in the range of [0, 31−N] corresponds to a second predetermined modulation scheme, wherein each of the first plurality of sequential values corresponds to a respective carrier of a plurality of carriers according to a sequence, wherein each of the second plurality of sequential values corresponds to a respective carrier of the plurality of carriers according to the sequence such that a first value in the first plurality of sequential values and a first value in the second plurality of sequential values correspond to a first predetermined carrier, and such that a second value in the first plurality of sequential values and a second value in the second plurality of sequential values correspond to a second predetermined carrier. ### Claim 11 (depends on 10) The first device of claim 10, wherein when a value of the MCS field is any value in [0, 31−N], the MCS field is used to indicate the data, and wherein N is a quantity of preset modulation schemes and is a positive integer. ### Claim 12 (depends on 10) The first device of claim 10, wherein in all values in [0, 31−N], N1 values are used to indicate a first modulation scheme, Ni values are used to indicate an ith modulation scheme, ∑ i = 1 N ⁢ N i = 32 - N , Ni is a positive integer, and each of the Ni values is used to indicate a carrier number.