Reference signal configuration

A method performed by a second communication device for communicating via radio with a first communication device, the method comprising:

• receiving a first transmission from the first communication device;
• determining at least one predefined Reference Signal (RS) configuration based on the received first transmission;
• transmitting, to the first communication device, a request to use an RS configuration out of the determined at least one predefined RS configuration for communication with the first communication device;
• receiving an RS configuration determined by the first communication device, wherein the determination of the received RS configuration is based on the transmitted request, transmitted to the first communication device by the second communication device and information comprised in a second transmission transmitted to the first communication device by a Radio Base Station (RBS), and wherein the information comprised in the second transmission corresponds to one of the second communication device and the RBS;
• and
• using the received RS configuration for communication with the first communication device.

A first communication device configured to communicate via radio with a second communication device, the first communication device comprising:

• a transmitting unit configured to transmit a first transmission to the second communication device, enabling the second communication device to determine a Reference Signal (RS) configuration suitable for use for communication between the first communication device and the second communication device;
• a receiving unit configured to receive a request to use the RS configuration, from the second communication device and a second transmission from a Radio Base Station (RBS), the received second transmission comprising information regarding one of the second communication device and the RBS;
• a determining unit configured to determine an RS configuration based on the received request and the information comprised in the received second transmission;
• and
• the transmitting unit further configured to transmit 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.

A second communication device configured to communicate via radio with a first communication device, the second communication device comprising:

• a receiving unit configured to receive a first transmission from the first communication device;
• a determining unit configured to determine at least one predefined Reference Signal (RS) configuration based on the received first transmission;
• a transmitting unit configured to transmit to the first communication device, a request to use an RS configuration out of the determined at least one predefined RS configuration for communication with the first communication device;
• and
• the receiving unit further configured to receive, from the first communication device, an RS configuration determined by the first communication device, wherein the determination of the received RS configuration is based on the request transmitted to the first communication device by the second communication device and information comprised in a second transmission transmitted to the first communication device by a Radio Base Station (RBS), and wherein the information comprised in the second transmission corresponds to one of the second communication device and the RBS;
• and
• the second communication device being configured to use the received RS configuration, for communication with the first communication device.