# US 12,224,868 B2 · Multi-layer transmission technique > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,868 B2 - Document ID: US12224868B2 - Status: Granted - Kind: B2 - Application number: 17/428,417 - Filed: 2020-02-14 - Published: 2022-05-12 - Granted: 2025-02-11 - Earliest claimed: 2019-02-14 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Leif Wilhelmsson; Saeedeh Moloudi - Web page: https://patentgrep.com/patent/US12224868B2 ## CPC - H04L 1/1825: Adaptation of specific ARQ protocol parameters according to transmission conditions - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04L 1/0086: {Unequal error protection (H04L27/00 and H04L1/004 take precedence for layer 1/2 aspects, e.g. bit loading)} - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04L 1/1845: {Combining techniques, e.g. code combining} - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 27/3405: {Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power} - H04L 27/3488: {Multiresolution systems} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A technique for performing a multi-layer transmission from a transmitting station to a receiving station on a radio frequency is described. The multi-layer transmission comprises multiple layers (902, 904) having different robustnesses on the radio frequency. As to a method aspect of the technique, a first portion (802.1) of first data (802) and a first portion (804.1) of second data (804) on a first layer (902) of the multi-layer transmission and, simultaneously on a second layer (904) of the multi-layer transmission, a second portion (802.2) of the first data (802) and a second portion (804.2) of the second data (804) are transmitted. ## Claims ### Claim 1 A method of performing a multi-intra-symbol-layer transmission from a transmitting station to a receiving station on a radio frequency, wherein each of a plurality of intra-symbol layers of a same modulation symbol has different robustnesses on the radio frequency, the method comprising: transmitting, on a first intra-symbol layer of the multi-intra-symbol-layer transmission, a first portion of first data and a first portion of second data and, simultaneously on a second intra-symbol layer of the multi-intra-symbol-layer transmission, a second portion of the first data and a second portion of the second data; wherein a size of the first portion of the first data, the second portion of the first data, the first portion of the second data, and/or the second portion of the second data depends on a signal to noise ratio (SNR) and/or a signal to interference and noise ratio (SINR) at the receiving station. ### Claim 2 (depends on 1) The method of claim 1, wherein: the first portion of the first data and the second portion of the first data are complementary portions of the first data; and/or the first portion of the second data and the second portion of the second data are complementary portions of the second data. ### Claim 3 (depends on 1) The method of claim 1, wherein: the first data is, or corresponds to, a combination of the first portion of the first data and the second portion of the first data; and/or the second data is, or corresponds to, a combination of the first portion of the second data and the second portion of the second data. ### Claim 4 (depends on 1) The method of claim 1, wherein at least one or each of the size(s) depends monotonically and/or linearly on the SNR or the SINR. ### Claim 5 (depends on 4) The method of claim 4: wherein: the size of the second portion of the first data is, or tends to be, zero if the SNR or the SINR is, or tends to be, equal to a first threshold value; and the size of the second portion of the first data monotonically and/or linearly increases as a function of the SNR or the SINR being greater than the first threshold value and/or less than a second threshold value; and/or wherein: the size of the first portion of the first data is, or tends to be, zero if the SNR or the SINR is, or tends to be, equal to the second threshold value; and the size of the first portion of the first data monotonically and/or linearly decreases as a function of the SNR or the SINR being greater than the first threshold value and/or less than the second threshold value. ### Claim 6 (depends on 1) The method of claim 1, further comprising: encoding a first data unit, the first data comprising a first codeword resulting from the encoding of the first data unit; and/or encoding a second data unit, the second data comprising a second codeword resulting from the encoding of the second data unit. ### Claim 7 (depends on 1) The method of claim 1, wherein the transmitting further comprises transmitting, on the first intra-symbol layer of the multi-intra-symbol-layer transmission, a first portion of third data and, simultaneously on the second intra-symbol layer of the multi-intra-symbol-layer transmission, a second portion of the third data and, simultaneously on a third intra-symbol layer of the multi-intra-symbol-layer transmission, a third portion of the first data and a third portion of the second data and a third portion of the third data. ### Claim 8 (depends on 7) The method of claim 7: wherein the transmission of the first data is an initial transmission or a retransmission; and/or wherein the transmission of the second data is an initial transmission or a retransmission; and/or wherein the transmission of the third data is an initial transmission or a retransmission. ### Claim 9 (depends on 7) The method of claim 7, wherein the multi-intra-symbol-layer transmission on the radio frequency is subject to an access protocol for shared access to the radio frequency; the access protocol comprising a back-off mechanism for deferring the multi-intra-symbol-layer transmission based on a contention window, which is maintained or not increased if the feedback message from the receiving station is indicative of a positive acknowledgement for the first data, the second data, and/or the third data. ### Claim 10 (depends on 1) The method of claim 1, further comprising receiving a feedback message from the receiving station. ### Claim 11 (depends on 10) The method of claim 10, wherein a size of the first portion of the first data and a size of the second portion of the first data are determined or changed by increasing the size of one of the size of the first portion of the first data and the size of the second portion of the first data, and decreasing the size of the other of the size of the first portion of the first data and the size of the second portion of the first data depending on the feedback message from the receiving station. ### Claim 12 (depends on 10) The method of claim 10: wherein the feedback message is indicative of the SNR and/or the SINR at the receiving station; wherein the method further comprises: retransmitting to the receiving station in response to the feedback message, if the feedback message is indicative that decoding of the first data was not successful by an amount of missing information or if the feedback message is indicative of a non-positive or negative acknowledgment (NACK) for the first data wherein an amount of missing information for successfully decoding of the first data being estimated based on the SNR or the SINR, a portion of the first data using the first intra-symbol layer, the second intra-symbol layer, and/or a third intra-symbol layer of the multi-intra-symbol-layer transmission. ### Claim 13 (depends on 12) The method of claim 12, wherein a size of the retransmitted portion of the first data depends on a code, a code length, or a correlation length of the code used for encoding a first data unit resulting in the first data. ### Claim 14 (depends on 12) The method of claim 12, further comprising: estimating the amount of missing information for successfully decoding of the first data based on the SNR or the SINR compared to a first threshold value, a second threshold value, and/or a third threshold value. ### Claim 15 (depends on 12) The method of claim 12, wherein the retransmitted portion comprises or is based on the second portion of the first data and/or the size of the retransmitted portion is equal to or less than the size of the second portion of the first data, if the SNR or the SNIR is greater than a first threshold value and/or less than a second threshold value. ### Claim 16 A method of performing a multi-intra-symbol-layer reception from a transmitting station at a receiving station on a radio frequency, wherein each of a plurality of intra-symbol layers of a same modulation symbol has different robustnesses on the radio frequency, the method comprising: receiving, on a first intra-symbol layer of the multi-intra-symbol-layer reception, a first portion of first data and a first portion of second data and, simultaneously on a second intra-symbol layer of the multi-intra-symbol-layer reception, a second portion of the first data and a second portion of the second data; wherein a size of the first portion of the first data, the second portion of the first data, the first portion of the second data, and/or the second portion of the second data depends on a signal to noise ratio (SNR) and/or a signal to interference and noise ratio (SINR) at the receiving station. ### Claim 17 (depends on 16) The method of claim 16, further comprising decoding each codeword for an individual intra-symbol layer; wherein decoding comprises, when at least one of the codewords is decoded successfully, soft values for the one or more other codewords are computed using the successfully decoded codeword as additional information. ### Claim 18 (depends on 17) The method of claim 17, wherein the same codeword is received on two or more intra-symbol layers; and wherein, at the receiving station, the information obtained from the two or more intra-symbol layers are combined when performing the decoding. ### Claim 19 A transmit device for performing a multi-intra-symbol-layer transmission from a transmitting station to a receiving station on a radio frequency, wherein each of a plurality of intra-symbol layers of a same modulation symbol has different robustnesses on the radio frequency, the transmit device comprising: processing circuitry; memory containing instructions executable by the processing circuitry whereby the transmit device is operative to: transmit, on a first intra-symbol layer of the multi-intra-symbol-layer transmission, a first portion of first data and a first portion of second data and, simultaneously on a second intra-symbol layer of the multi-intra-symbol-layer transmission, a second portion of the first data and a second portion of the second data; wherein a size of the first portion of the first data, the second portion of the first data, the first portion of the second data, and/or the second portion of the second data depends on a signal to noise ratio (SNR) and/or a signal to interference and noise ratio (SINR) at the receiving station. ### Claim 20 A receive device for performing a multi-intra-symbol-layer reception from a transmitting station at a receiving station on a radio frequency, wherein each of a plurality of intra-symbol layers of a same modulation symbol has different robustnesses on the radio frequency, the receive device comprising: processing circuitry; memory containing instructions executable by the processing circuitry whereby the receive device is operative to: receive, on a first intra-symbol layer of the multi-intra-symbol-layer reception, a first portion of first data and a first portion of second data and, simultaneously on a second intra-symbol layer of the multi-intra-symbol-layer reception, a second portion of the first data and a second portion of the second data; wherein a size of the first portion of the first data, the second portion of the first data, the first portion of the second data, and/or the second portion of the second data depends on a signal to noise ratio (SNR) and/or a signal to interference and noise ratio (SINR) at the receiving station.