A method and apparatus are provided for transmitting a sounding reference signal in a communication system. Embodiments include polyethylene glycolpolylysine block or comb-type copolymers with high molecular weight PLL ; PEGPLL copolymers in which the PLL is a dendrimer which is attached to one end of the PEG; and multilayer compositions including alternating layers of polycationic and polyanionic materials. The UE receives a response allocating a CSI feedback resource or allocating a resource for negotiation from the eNB.