# US 10,321,470 B2 · Method and apparatus for employing resource for device-to-device (D2D) wireless communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,321,470 B2 - Document ID: US10321470B2 - Status: Granted - Kind: B2 - Application number: 15/039,981 - Filed: 2014-11-27 - Published: 2018-07-12 - Granted: 2019-06-11 - Earliest claimed: 2013-11-27 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sangmin Ro; Yongjun Kwak; Hyoungju Ji - Web page: https://patentgrep.com/patent/US10321470B2 ## CPC - H04W 72/56: based on priority criteria - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/044: based on the type of the allocated resource - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Provided are a method and apparatus for transmitting control information in device-to-device (D2D) communication. A D2D communication method for a transmitting user equipment (Tx UE) may include: sending a channel sensing signal containing priority information of the Tx UE and data; checking whether a resource transfer request message containing priority information is received from a receiving user equipment (Rx UE); checking, when a resource transfer request message is received, whether the priority of the Tx UE is lower than the priority of the Rx UE; and terminating, when the priority of the Tx UE is lower than the priority of the Rx UE, transmission of the data. As the channel sensing signal required for D2D communication based on distributed resource allocation is used to convey priority information, it is possible to minimize overhead due to introduction of additional control channels and signals for acquiring radio resources. ## Claims ### Claim 1 A method of device-to-device (D2D) communication by a transmitting user equipment (Tx UE), the method comprising: sending a channel sensing signal containing first information on a priority of the Tx UE and data; receiving a resource transfer request message containing second information on a priority of a receiving user equipment (Rx UE); identifying whether the priority of the Tx UE is lower than the priority of the Rx UE; and terminating a transmission of the data in case that the priority of the Tx UE is lower than the priority of the Rx UE, wherein the channel sensing signal includes a first sequence in a first symbol and a second sequence in a second symbol, the first symbol and the second symbol are in a same slot of time domain, and wherein the first sequence indicates a priority determined based on a service type of the data and the second sequence indicates a priority determined based on information on a user of the Tx UE. ### Claim 2 (depends on 1) The method of claim 1, wherein the resource transfer request message is received through a pre-configured resource. ### Claim 3 (depends on 1) The method of claim 1, wherein the first and second information are assigned and stored in advance in the Tx UE and Rx UE on a per-UE basis. ### Claim 4 (depends on 1) The method of claim 1, further comprising terminating transmission of the data in case that the resource transfer request message containing a top-priority indication is received from the Rx UE. ### Claim 5 A method of device-to-device (D2D) communication by a receiving user equipment (Rx UE), the method comprising: receiving a channel sensing signal containing first information on a priority of a transmitting user equipment (Tx UE); identifying whether a priority of the Rx UE is higher than the priority of the Tx UE; sending, in case that the priority of the Rx UE is higher than the priority of the Tx UE, a resource transfer request message containing second information on the priority of the Rx UE; and performing channel sensing for a preset or randomly selected duration, wherein the channel sensing signal includes a first sequence in a first symbol and a second sequence in a second symbol, the first symbol and the second symbol are in a same slot of time domain, and wherein the first sequence indicates a priority determined based on a service type of the data and the second sequence indicates a priority determined based on information on a user of the Tx UE. ### Claim 6 (depends on 5) The method of claim 5, wherein the resource transfer request message is sent through a pre-configured resource. ### Claim 7 (depends on 5) The method of claim 5, wherein the first and second information are assigned and stored in advance in the Tx UE and Rx UE on a per-UE basis. ### Claim 8 (depends on 5) The method of claim 5, further comprising: receiving information indicating that data to be sent has the top priority; and sending a resource transfer request message containing a top-priority indication. ### Claim 9 A transmitting user equipment (Tx UE) supporting device-to-device (D2D) communication, comprising: a transceiver; and a controller coupled with the transceiver and configured to control to: send a channel sensing signal containing first information on a priority of the Tx UE and data, receive a resource transfer request message containing second information on a priority a receiving user equipment (Rx UE), identify whether the priority of the Tx UE is lower than the priority of the Rx UE, and terminate a transmission of the data in case that the priority of the Tx UE is lower than the priority of the Rx UE, wherein the channel sensing signal includes a first sequence in a first symbol and a second sequence in a second symbol, the first symbol and the second symbol are in a same slot of time domain, and wherein the first sequence indicates a priority determined based on a service type of the data and the second sequence indicates a priority determined based on information on a user of the Tx UE. ### Claim 10 (depends on 9) The Tx UE of claim 9, wherein the resource transfer request message is received through a pre-configured resource. ### Claim 11 (depends on 9) The Tx UE of claim 9, wherein the first and second information are assigned and stored in advance in the Tx UE and Rx UE on a per-UE basis. ### Claim 12 (depends on 9) The Tx UE of claim 9, wherein the controller is further configured to terminate transmission of the data in case that the resource transfer request message containing a top-priority indication is received from the Rx UE. ### Claim 13 A receiving user equipment (Rx UE) supporting device-to-device (D2D) communication, comprising: a transceiver; and a controller coupled with the transceiver and configured to control to: receive a channel sensing signal containing first information on a priority of a transmitting user equipment (Tx UE), identify whether a priority of the Rx UE is higher than the priority of the Tx UE, and send, in case that the priority of the Rx UE is higher than the priority of the Tx UE, a resource transfer request message containing second information on the priority of the Rx UE, and perform channel sensing for a preset or randomly selected duration, wherein the channel sensing signal includes a first sequence in a first symbol and a second sequence in a second symbol, the first symbol and the second symbol are in a same slot of time domain, and wherein the first sequence indicates a priority determined based on a service type of the data and the second sequence indicates a priority determined based on information on a user of the Tx UE. ### Claim 14 (depends on 13) The Rx UE of claim 13, wherein the controller is further configured to send the resource transfer request message through a pre-configured resource. ### Claim 15 (depends on 13) The Rx UE of claim 13, wherein the first and second information are assigned and stored in advance in the Tx UE and Rx UE on a per-UE basis. ### Claim 16 (depends on 13) The Rx UE of claim 13, wherein, in case that information indicating that data to be sent has the top priority is received, the controller is further configured to send a resource transfer request message containing a top-priority indication.