# US 11,910,234 B2 · Control overhead reduction in sidelink network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,234 B2 - Document ID: US11910234B2 - Status: Granted - Kind: B2 - Application number: 17/343,242 - Filed: 2021-06-09 - Published: 2021-12-16 - Granted: 2024-02-20 - Earliest claimed: 2020-06-11 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jung Ho Ryu; Junyi Li; Vasanthan Raghavan - Web page: https://patentgrep.com/patent/US11910234B2 ## CPC - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04W 72/02: Selection of wireless resources by user or terminal - H04W 28/26: Resource reservation - H04W 72/541: using the level of interference - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Methods, systems, and devices for wireless communications are described. Multiple user equipments (UEs) may communicate as part of a sidelink communications system. The UEs may identify a frame for a sidelink connection. The frame may include a control portion and a data portion. One UE of a pair of UEs may receive a data signal from the other UE of the pair, and the data signal may be received in the data portion of the first instance of the frame and in the control portion of a second instance of the frame. Another pair of UEs may attempt to reserve a subsequent data portion by transmitting a request signal in the control portion in the second instance of the frame, and the second pair of UEs may receive a suppression signal from the first pair of UEs indicating ongoing data transmission by the first pair of UEs. ## Claims ### Claim 1 A method for wireless communications at a first user equipment (UE), comprising: identifying, for a sidelink connection, a frame comprising a control portion and a data portion that is associated with the control portion, the control portion comprising a plurality of control regions, each control region comprising a first transmission time interval for channel reservation requests for a group of UEs and a second transmission time interval for channel reservation responses for the group of UEs; determining that a second UE has obtained access to the sidelink connection for communications with the first UE in a first instance of the frame; and receiving, from the second UE, a data signal in the data portion of the first instance of the frame and in at least a part of the control portion of a second instance of the frame that follows the first instance. ### Claim 2 (depends on 1) The method of claim 1, further comprising: determining, in the at least a part of the control portion of the second instance of the frame, a presence of interference on the sidelink connection; and transmitting, based at least in part on determining the presence of the interference, a signal indicating that the first UE is receiving data from the second UE. ### Claim 3 (depends on 2) The method of claim 2, further comprising: determining that a level of the interference satisfies an interference threshold, wherein the signal indicating that the first UE is receiving data from the second UE is transmitted based at least in part on the level of the interference satisfying the interference threshold. ### Claim 4 (depends on 2) The method of claim 2, further comprising: receiving, at the first UE, a channel reservation request addressed to a third UE and from a fourth UE, wherein the presence of the interference is determined based at least in part on the received channel reservation request. ### Claim 5 (depends on 4) The method of claim 4, wherein the channel reservation request and the data signal are received at least in part during a same time interval. ### Claim 6 (depends on 2) The method of claim 2, further comprising: switching from a receive mode to a transmit mode based at least in part on determining the presence of the interference, the signal indicating that the first UE is receiving data from the second UE transmitted in the transmit mode. ### Claim 7 (depends on 2) The method of claim 2, further comprising: identifying a length of the signal indicating that the first UE is receiving data from the second UE based at least in part on the interference. ### Claim 8 (depends on 7) The method of claim 7, further comprising: determining a receive power for the interference, the length of the signal determined based at least in part on the determined receive power for the interference. ### Claim 9 (depends on 2) The method of claim 2, wherein the signal indicating that the first UE is receiving data from the second UE comprises a predetermined sequence. ### Claim 10 (depends on 1) The method of claim 1, wherein determining that the second UE has obtained access to the sidelink connection for communications with the first UE comprises: receiving, from the second UE, a channel reservation request addressing the first UE. ### Claim 11 (depends on 10) The method of claim 10, further comprising: transmitting, in response to the received channel reservation request, a channel reservation response addressing the second UE. ### Claim 12 (depends on 1) The method of claim 1, wherein each control region of the plurality of control regions corresponds to a priority level of a set of priority levels. ### Claim 13 (depends on 1) The method of claim 1, wherein the sidelink connection is in an unlicensed radio frequency spectrum band. ### Claim 14 (depends on 1) The method of claim 1, wherein the sidelink connection is in a shared licensed radio frequency spectrum band. ### Claim 15 (depends on 1) The method of claim 1, wherein the first UE lacks an access link to a base station. ### Claim 16 (depends on 1) The method of claim 1, wherein the sidelink connection comprises a PC5 vehicle-to-vehicle interface of a cellular network. ### Claim 17 A method for wireless communications at a second user equipment (UE), comprising: identifying, for a sidelink connection, a frame comprising a control portion and a data portion that is associated with the control portion, the control portion comprising a plurality of control regions, each control region comprising a first transmission time interval for channel reservation requests for a group of UEs and a second transmission time interval for channel reservation responses for the group of UEs; obtaining access to the sidelink connection based at least in part on a successful channel access procedure in a first instance of the frame; and transmitting, to a first UE, a data signal in the data portion of the first instance of the frame and in at least a part of the control portion of a second instance of the frame that follows the first instance. ### Claim 18 (depends on 17) The method of claim 17, further comprising: transmitting, based at least in part on the obtaining access to the sidelink connection, a channel reservation request addressing the first UE; and receiving, in response to the transmitted channel reservation request, a channel reservation response from the first UE, the data signal transmitted based at least in part on receiving the channel reservation response. ### Claim 19 (depends on 17) The method of claim 17, wherein each control region of the plurality of control regions corresponds to a priority level of a set of priority levels. ### Claim 20 (depends on 17) The method of claim 17, wherein the sidelink connection is in an unlicensed radio frequency spectrum band or a shared licensed radio frequency spectrum band. ### Claim 21 A method for wireless communications at a third user equipment (UE), comprising: identifying, for a sidelink connection, a frame comprising a control portion and a data portion that is associated with the control portion, the control portion comprising a plurality of control regions, each control region comprising a first transmission time interval for channel reservation requests for a group of UEs and a second transmission time interval for channel reservation responses for the group of UEs; receiving, in the first transmission time interval of the frame, a channel reservation request from a fourth UE; receiving, from a first UE, a signal indicating that the first UE is receiving data from a second UE during at least a part of the control portion of the frame; and determining to refrain from transmitting a channel reservation response to the fourth UE in response to the received channel reservation request based at least in part on receiving the signal indicating that the first UE is receiving data from a second UE. ### Claim 22 (depends on 21) The method of claim 21, further comprising: monitoring for channel reservation requests during the first transmission time interval based at least in part on the identified frame. ### Claim 23 (depends on 21) The method of claim 21, wherein the received signal indicating that the first UE is receiving data from the second UE comprises a predetermined sequence. ### Claim 24 (depends on 21) The method of claim 21, wherein each control region of the plurality of control regions corresponds to a priority level of a set of priority levels. ### Claim 25 (depends on 21) The method of claim 21, wherein the sidelink connection is in an unlicensed radio frequency spectrum band or a shared licensed radio frequency spectrum band. ### Claim 26 A method for wireless communications at a fourth user equipment, comprising: identifying, for a sidelink connection, a frame comprising a control portion and a data portion that is associated with the control portion, the control portion comprising a plurality of control regions, each control region comprising a first transmission time interval for channel reservation requests for a group of UEs and a second transmission time interval for channel reservation responses for the group of UEs; transmitting, in the first transmission time interval of the frame, a channel reservation request to a third UE; receiving, from a first UE, a signal indicating that the first UE is receiving data from a second UE during at least a part of the control portion of the frame; and determining to refrain from transmitting a data signal to the third UE in response to the received signal indicating the first UE is receiving data from a second UE. ### Claim 27 (depends on 26) The method of claim 26, wherein the frame comprises a first frame, and determining to refrain from transmitting the data signal comprises: determining to refrain from transmitting the data signal to the third UE in a second frame. ### Claim 28 (depends on 26) The method of claim 26, wherein the received signal indicating that the first UE is receiving data from the second UE comprises a predetermined sequence. ### Claim 29 (depends on 26) The method of claim 26, wherein each control region of the plurality of control regions corresponds to a priority level of a set of priority levels. ### Claim 30 (depends on 26) The method of claim 26, wherein the sidelink connection is in an unlicensed radio frequency spectrum band or a shared licensed radio frequency spectrum band.