# US 11,910,387 B2 · Method and apparatus for communicating two stage sidelink control information > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,387 B2 - Document ID: US11910387B2 - Status: Granted - Kind: B2 - Application number: 17/553,352 - Filed: 2021-12-16 - Published: 2022-04-07 - Granted: 2024-02-20 - Earliest claimed: 2019-02-12 - Assignees: Lenovo (Singapore) Pte. Ltd. - Applicants: Lenovo (Singapore) Pte. Ltd. - Inventors: Karthikeyan Ganesan; Prateek Basu Mallick; Joachim Löhr; Alexander Johann Maria Golitschek Edler von Elbwart; Vijay Nangia - Web page: https://patentgrep.com/patent/US11910387B2 ## CPC - H04W 4/46: for vehicle-to-vehicle communication [V2V] - H04W 72/20: Control channels or signalling for resource management - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04W 72/121: for groups of terminals or users - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - 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 First stage SCI can be determined. The first stage SCI can include a modification periodicity. The modification periodicity can be for the periodicity of modification of the second stage SCI. The first stage SCI can be periodically transmitted. The second stage SCI can be determined. The second stage SCI can be transmitted. ## Claims ### Claim 1 A User Equipment (UE) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: determine first stage Sidelink Control Information (SCI), the first stage SCI including a modification periodicity, the modification periodicity being for the periodicity of modification of second stage SCI; and periodically transmit the first stage SCI, determine the second stage SCI, and transmit the second stage SCI. ### Claim 2 (depends on 1) The UE according to claim 1, wherein the first stage SCI includes a modification periodicity bit map field that includes a time slot index and a periodicity. ### Claim 3 (depends on 1) The UE according to claim 1, wherein the modification periodicity comprises a first modification periodicity, wherein the at least one processor is configured to cause the UE to: start a modification period timer, and transmit another first stage SCI including a second modification periodicity. ### Claim 4 (depends on 1) The UE according to claim 1, wherein the first stage SCI includes parameters for the second stage SCI and Physical Sidelink Shared Channel (PSSCH), where the parameters include at least one parameter selected from Modulation and Coding Scheme (MCS), Transmit Power Control (TPC) command, Sidelink Channel State Information (S-CSI) request, Codebook Block Group (CBG) transmission information, CBG flushing information, Demodulation Reference Signal (DMRS) sequence initialization, source identifier, beam/Transmission Configuration Indicator (TCI) state, and spatial relation for S-CSI. ### Claim 5 (depends on 1) The UE according to claim 1, wherein the at least one processor is configured to cause the UE to: transmit a first transport block in accordance with the second stage SCI, and transmit a second transport block in accordance with a same second stage SCI, where the second transport block is different from the first transport block. ### Claim 6 (depends on 1) The UE according to claim 1, wherein the at least one processor is configured to cause the UE to: receive a request to transmit second stage SCI with updated scheduling information, and transmit the second stage SCI with the updated scheduling information. ### Claim 7 (depends on 1) The UE according to claim 1, wherein the at least one processor is configured to cause the UE to: transmit a transport block on a Physical Sidelink Shared Channel (PSSCH) in accordance with the second stage SCI, and retransmit the transport block on the same PSSCH in accordance with the second stage SCI if the first stage SCI indicates absence of a presence of the second stage SCI or a modification period timer has not expired. ### Claim 8 A base station for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the base station to: receive first stage Sidelink Control Information (SCI), the first stage SCI including a modification periodicity and second stage SCI parameters, the modification periodicity being for the periodicity of modification of the second stage SCI, and receive the second stage SCI including data parameters. ### Claim 9 (depends on 8) The base station according to claim 8, wherein the at least one processor is configured to cause the base station to: start a modification period timer, decode a data channel based on the SCI, and restart the modification period timer when the base station receives a second first stage SCI including an indication of the second stage SCI. ### Claim 10 (depends on 8) The base station according to claim 8, wherein the at least one processor is configured to cause the base station to: determine second stage SCI is not present in a time slot, and decode a physical sidelink shared channel based on a previously received second stage SCI. ### Claim 11 (depends on 8) The base station according to claim 8, wherein the at least one processor is configured to cause the base station to: determine second stage SCI is not present in a time slot, and send a request, via layer 1 or layer 2 signaling, to transmit the second stage SCI. ### Claim 12 (depends on 8) The apparatus base station according to claim 8, wherein the at least one processor is configured to cause the base station to: determine second stage SCI has not been decoded in resources indicated by the first stage SCI, and send a request to retransmit the second stage SCI. ### Claim 13 (depends on 8) The base station according to claim 8, wherein the second stage SCI comprises first second stage SCI; wherein the at least one processor is configured to cause the base station to: receive another first stage SCI including information for a second second stage SCI, determine the second second stage SCI has not been decoded in resources indicated by the another first stage SCI, and abstain from decoding a physical sidelink shared channel using the first second stage SCI if the second second stage SCI has not been decoded. ### Claim 14 (depends on 8) The base station according to claim 8, wherein the at least one processor is configured to cause the base station to abstain from decoding the second stage SCI if the first stage SCI indicates absence of a presence of the second stage SCI or a modification period timer has not expired. ### Claim 15 (depends on 8) The base station according to claim 8, wherein the at least one processor is configured to cause the base station to assume a current physical sidelink shared channel transmission is a retransmission of a transport block corresponding to a most recently received second stage sidelink control information if the first stage SCI indicates an absence of a presence of the second stage SCI or a modification period timer has not expired. ### Claim 16 (depends on 8) The base station according to claim 8, wherein the at least one processor is configured to cause the base station to: transmit Sidelink Channel State Information (S-CSI) when the second stage SCI is received, and abstain from transmitting S-CSI when the second stage SCI is not received. ### Claim 17 A method comprising: determining, at a UE, first stage Sidelink Control Information (SCI), the first stage SCI including a modification periodicity, the modification periodicity being for the periodicity of modification of second stage SCI; periodically transmitting, by the UE, the first stage SCI; determining the second stage SCI; and transmitting the second stage SCI. ### Claim 18 (depends on 17) The method according to claim 17, wherein the first stage SCI includes a modification periodicity bit map field that includes a time slot index and a periodicity. ### Claim 19 (depends on 17) The method according to claim 17, wherein the modification periodicity comprises a first modification periodicity, wherein the method comprises: starting a modification period timer; and transmitting another first stage SCI including a second modification periodicity. ### Claim 20 A processor for wireless communication, comprising: at least one controller coupled with at least one memory and configured to cause the processor to: determine first stage Sidelink Control Information (SCI), the first stage SCI including a modification periodicity, the modification periodicity being for the periodicity of modification of second stage SCI; periodically transmit the first stage SCI; determine the second stage SCI; and transmit the second stage SCI.