A method performed by a first communication device for communicating via radio with a second communication device, the method comprising: - receiving (4:1) a first transmission from the second communication device, - estimating channel characteristics based on the first transmission, - transmitting (4:2) a second transmission to the second communication device, enabling the second communication device to determine (4:5), based on the second transmission, one or more Reference Signal, RS, configurations suitable for use for communication between the first communication device and the second communication device, - receiving (4:3) a third transmission from the second communication device, wherein the third transmission comprises parameters specific for operation of the second communication device, - receiving (4:4) a fourth transmission from a neighboring Radio Base Station, RBS, the fourth transmission comprising information regarding the second communication device or the neighboring RBS, - receiving (4:6) a request from the second communication device, wherein the request comprises the determined one or more RS configurations, - determining (4:7) an RS configuration based on the estimated channel characteristics, the received request comprising the determined one or more RS configurations, parameters specific for the operation of the second communication device, and the information comprised in the received fourth transmission, and - transmitting (4:8) the determined RS configuration to the second communication device, the determined RS configuration enabling communication between the first communication device and the second communication device. - receiving (4:1) a first transmission from the second communication device, - estimating channel characteristics based on the first transmission, - transmitting (4:2) a second transmission to the second communication device, enabling the second communication device to determine (4:5), based on the second transmission, one or more Reference Signal, RS, configurations suitable for use for communication between the first communication device and the second communication device, - receiving (4:3) a third transmission from the second communication device, wherein the third transmission comprises parameters specific for operation of the second communication device, - receiving (4:4) a fourth transmission from a neighboring Radio Base Station, RBS, the fourth transmission comprising information regarding the second communication device or the neighboring RBS, - receiving (4:6) a request from the second communication device, wherein the request comprises the determined one or more RS configurations, - determining (4:7) an RS configuration based on the estimated channel characteristics, the received request comprising the determined one or more RS configurations, parameters specific for the operation of the second communication device, and the information comprised in the received fourth transmission, and - transmitting (4:8) the determined RS configuration to the second communication device, the determined RS configuration enabling communication between the first communication device and the second communication device.