# US 2025/0098016 A1 · Device-to-device wireless communication method and user equipment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0098016 A1 - Document ID: US20250098016A1 - Status: Published application - Kind: A1 - Application number: 18/972,518 - Filed: 2024-12-06 - Published: 2025-03-20 - Earliest claimed: 2014-09-26 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Lilei Wang; Prateek Basu Mallick; Hidetoshi Suzuki; Joachim Loehr; Masayuki Hoshino - Web page: https://patentgrep.com/patent/US20250098016A1 ## CPC - H04W 76/23: Manipulation of direct-mode connections - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/56: based on priority criteria - H04W 36/033: {in pre-organised networks} - 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 D2D wireless communication methods and UEs therefor. In one embodiment, the D2D wireless communication method performed by a UE includes continuing D2D transmission by using a resource from a resource pool allocated for mode 2 operation when switching from mode 1 operation to mode 2 operation. In another embodiment, the D2D wireless communication method performed by a UE includes performing D2D transmission by using a resource from a resource pool allocated for mode 2 operation, wherein the resource pool is indicated by a dedicated RRC signaling transmitted by an eNB, a SIB transmitted by an eNB, a PD2DSCH transmitted by other UE(s), and/or pre-configuration, and the dedicated RRC signaling, the SIB, the PD2DSCH and the pre-configuration are in descending order in priority when determining the resource pool. ## Claims ### Claim 1 A base station comprising: circuitry, which in operation, allocates a first resource pool and a second resource pool, which are used for a transmission of a device to device (D2D) signal; and a transmitter, which in operation, transmits to a communication apparatus information of the first resource pool by a dedicated Radio Resource Control (RRC) signaling and information of the second resource pool by a System Information Block (SIB); and wherein the first resource pool is utilized among the first resource pool, the second resource pool and a preconfigured resource pool in a case that the first resource pool and the second resource pool are indicated in an RRC_CONNECTED state, and the second resource pool is utilized among the second resource pool and the preconfigured resource pool in a case that the second resource pool is indicated in an RRC IDLE state. ### Claim 2 (depends on 1) The base station according to claim 1, wherein the transmission of the D2D signal is in a non-exceptional case. ### Claim 3 (depends on 1) The base station according to claim 1, wherein the second resource pool is used when the communication apparatus switches from mode 1 to mode 2, the mode 1 being a transmission mode in which an eNode B schedules resources for a communication and the mode 2 being a transmission mode in which the communication apparatus autonomously schedules resources for the communication. ### Claim 4 (depends on 1) The base station according to claim 1, wherein each of the first resource pool and the second resource pool includes a plurality of resources, and the signal is mapped to one of the plurality of resources. ### Claim 5 A communication method comprising: allocating a first resource pool and a second resource pool, which are used for a transmission of a device to device (D2D) signal; and transmitting to a communication apparatus information of the first resource pool by a dedicated Radio Resource Control (RRC) signaling and information of the second resource pool by a System Information Block (SIB); and wherein the first resource pool is utilized among the first resource pool, the second resource pool and a preconfigured resource pool in a case that the first resource pool and the second resource pool are indicated in an RRC_CONNECTED state, and the second resource pool is utilized among the second resource pool and the preconfigured resource pool in a case that the second resource pool is indicated in an RRC IDLE state. ### Claim 6 (depends on 5) The communication method according to claim 5, wherein the transmission of the D2D signal is in a non-exceptional case. ### Claim 7 (depends on 5) The communication method according to claim 5, wherein the second resource pool is used when the communication apparatus switches from mode 1 to mode 2, the mode 1 being a transmission mode in which a base station schedules resources for a communication and the mode 2 being a transmission mode in which the communication apparatus autonomously schedules resources for the communication. ### Claim 8 (depends on 5) The communication method according to claim 5, wherein each of the first resource pool and the second resource pool includes a plurality of resources, and the signal is transmitted in one of the plurality of resources. ### Claim 9 An integrated circuit used for a base station comprising: allocation circuitry, which in operation, controls allocating a first resource pool and a second resource pool, which are used for a transmission of a device to device (D2D) signal; and transmission circuitry, which in operation, controls transmitting to a communication apparatus information of the first resource pool by a dedicated Radio Resource Control (RRC) signaling and information of the second resource pool by a System Information Block (SIB); and wherein the first resource pool is utilized among the first resource pool, the second resource pool and a preconfigured resource pool in a case that the first resource pool and the second resource pool are indicated in an RRC_CONNECTED state, and the second resource pool is utilized among the second resource pool and the preconfigured resource pool in a case that the second resource pool is indicated in an RRC IDLE state. ### Claim 10 (depends on 9) The integrated circuit according to claim 9, wherein the transmission of the D2D signal is in a non-exceptional case. ### Claim 11 (depends on 9) The integrated circuit according to claim 9, wherein the second resource pool is used when the communication apparatus switches from mode 1 to mode 2, the mode 1 being a transmission mode in which an eNode B schedules resources for a communication and the mode 2 being a transmission mode in which the communication apparatus autonomously schedules resources for the communication. ### Claim 12 (depends on 9) The integrated circuit according to claim 9, wherein each of the first resource pool and the second resource pool includes a plurality of resources, and the signal is mapped to one of the plurality of resources.