# US 10,455,607 B2 · Communication methods and apparatus employing rateless codes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,607 B2 - Document ID: US10455607B2 - Status: Granted - Kind: B2 - Application number: 15/591,719 - Filed: 2017-05-10 - Published: 2017-11-16 - Granted: 2019-10-22 - Earliest claimed: 2016-05-12 - Assignees: Sharp Laboratories of America, Inc. - Applicants: SHARP Laboratories of America, Inc. - Inventors: John Michael Kowalski; Toshizo Nogami; Jia Sheng; Zhanping Yin - Web page: https://patentgrep.com/patent/US10455607B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0041: {Arrangements at the transmitter end} - H04L 1/0045: {Arrangements at the receiver end} - H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)} - H04L 1/0065: {Serial concatenated codes} - H04L 1/1816: {with retransmission of the same, encoded, message} - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 1/1896: {ARQ related signaling} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A wireless terminal and a node employed in a wireless communications system comprise an outer coding unit configured to use a code with properties akin to Raptor codes as outer erasure codes; and an inner coding unit configured to use an LDPC code as pre-code. The wireless terminal and the node use a code with properties akin to Raptor codes as outer erasure codes, and use the LDPC code as a pre-code. ## Claims ### Claim 1 A node of a radio access network comprising: processor circuitry configured to generate a NT persistent grant message which permits the wireless terminal to transmit NT number of rateless codeword segments representing redundancy versions of a transmission of a wireless terminal; a transmitter configured to transmit the NT persistent grant to the wireless terminal; wherein the processor circuitry is further configured to generate a new data indicator which indicates that the wireless terminal transmits a new sequence of NT rateless codeword segments corresponding to new message/source bits; and wherein the processor circuitry is configured to generate the new data indicator before a K number of resources of a previous grant have been completely used. ### Claim 2 (depends on 1) The node of claim 1, further comprising a receiver configured to receive a schedule request from a wireless terminal, and wherein the NT persistent grant is generated in response to the schedule request. ### Claim 3 (depends on 1) The node of claim 1, wherein the processor circuitry is configured to autonomously generate the NT persistent grant. ### Claim 4 (depends on 1) The node of claim 1, wherein the processor circuitry is further configured to include the new data indicator in a new NT persistent grant. ### Claim 5 (depends on 1) The node of claim 1, wherein the processor circuitry is further configured to generate the NT persistent grant message to indicate that K number of resources are used for transmission of the NT number of rateless codeword segments. ### Claim 6 (depends on 1) The node of claim 1, wherein the processor circuitry is configured to determine the NT number in the NT persistent grant based on a pattern of transmissions from the wireless terminal. ### Claim 7 (depends on 1) The node of claim 1, wherein the processor circuitry is configured to determine the number NT in the persistent grant based on transmit power of the wireless terminal. ### Claim 8 (depends on 1) The node of claim 1, wherein the processor circuitry is configured to determine the number NT in the persistent grant based on a Sounding Reference Signal (SRS) transmission. ### Claim 9 (depends on 1) The node of claim 1, wherein the processor circuitry is configured to determine the number NT in the persistent grant based on historical transmission success of the wireless terminal. ### Claim 10 (depends on 1) The node of claim 1, wherein the processor circuitry is configured to dynamically determine the number NT in the persistent grant. ### Claim 11 (depends on 1) The node of claim 1, wherein the processor circuitry comprises a decoder which is configured to decode codewords as having been coded using a code with properties of Raptor codes as outer erasure codes and using an LDPC code as pre-code. ### Claim 12 (depends on 1) The node of claim 1, wherein the processor circuitry is further configured, in lieu of transmitting a Modulation and Coding Scheme (MCS) table comprising both modulation type and coding scheme, to transit to the wireless terminal a modulation type. ### Claim 13 A wireless terminal comprising: transmitter circuitry configured to transmit a schedule request to a node of a radio access network; a receiver configured to receive from the node a NT persistent grant message which permits the wireless terminal to transmit NT number of rateless codeword segments representing redundancy versions of a transmission of the wireless terminal; a processor configured to generate the NT number of rateless codeword segments; a transmitter configured to transmit the NT number of rateless codeword segments to the node, wherein the processor circuitry is further configured to receive from the node a new data indicator which indicates that the wireless terminal may transmit a new sequence of NT rateless codeword segments corresponding to new message/source bits; and wherein the NT persistent grant message indicates to the wireless terminal that K number of resources are used for transmission of the NT number of rateless codeword segments. ### Claim 14 (depends on 13) The wireless terminal of claim 13, wherein when the new data indicator is received before the K number of resources of a previous grant have been completely used, the wireless terminal begins transmission of the new sequence of NT rateless codewords corresponding to the new message/source bits, thereby obviating need of a physical HARQ indicator channel. ### Claim 15 (depends on 13) The wireless terminal of claim 13, wherein the processor circuitry comprises an encoder which is configured use a code with properties of Raptor codes as an outer erasure code and to use an inner coding unit configured to use an LDPC code as pre-code. ### Claim 16 (depends on 13) The wireless terminal of claim 13, wherein the receiver circuitry is further configured, in lieu of receiving a MCS table comprising both modulation type and coding scheme, to receive from the node modulation type.