A method performed by a wireless device, comprising: receiving one or more resource pool configurations for a particular discovery carrier, the one or more resource pool configurations each comprising information indicating one or more of resource elements and subframes that the wireless device should use to monitor for incoming discovery messages and transmit outgoing discovery messages, the received one or more resource pool configurations comprising at least a first resource pool configuration received from a serving network node of the wireless device operating in Time Division Duplex mode; determining which of the received one or more resource pool configurations that the wireless device should use to monitor for incoming discovery messages and transmit outgoing discovery messages; characterized in that the method comprises: determining whether the received one or more resource pool configurations for the particular discovery carrier include a second resource pool configuration received via system information of the particular discovery carrier; and upon determining that the received one or more resource pool configurations for the particular discovery carrier includes the second resource pool configuration received via system information of the particular discovery carrier, using the second resource pool configuration to monitor for incoming discovery messages and transmit outgoing discovery messages. receiving one or more resource pool configurations for a particular discovery carrier, the one or more resource pool configurations each comprising information indicating one or more of resource elements and subframes that the wireless device should use to monitor for incoming discovery messages and transmit outgoing discovery messages, the received one or more resource pool configurations comprising at least a first resource pool configuration received from a serving network node of the wireless device operating in Time Division Duplex mode; determining which of the received one or more resource pool configurations that the wireless device should use to monitor for incoming discovery messages and transmit outgoing discovery messages; characterized in that the method comprises: determining whether the received one or more resource pool configurations for the particular discovery carrier include a second resource pool configuration received via system information of the particular discovery carrier; and upon determining that the received one or more resource pool configurations for the particular discovery carrier includes the second resource pool configuration received via system information of the particular discovery carrier, using the second resource pool configuration to monitor for incoming discovery messages and transmit outgoing discovery messages. determining whether the received one or more resource pool configurations for the particular discovery carrier include a second resource pool configuration received via system information of the particular discovery carrier; and upon determining that the received one or more resource pool configurations for the particular discovery carrier includes the second resource pool configuration received via system information of the particular discovery carrier, using the second resource pool configuration to monitor for incoming discovery messages and transmit outgoing discovery messages.