Methods and Apparatuses for Handling Reference Signals in a Cellular Network

A base station adapted to enable a user equipment to transmit a configured demodulation reference signal when being served by the base station, the base station comprising:

• a configuration circuit adapted to assign a UE-specific base sequence and a UE-specific cyclic shift hopping pattern to the user equipment, and
• a transceiver circuit adapted to send a plurality of configuration parameters to the user equipment, said configuration parameters indicating the assigned said UE-specific base sequence and UE-specific cyclic shift hopping pattern, to enable the user equipment to use said configuration parameters to generate and transmit the demodulation reference signal based on at least one of said UE-specific base sequence and UE-specific cyclic shift hopping pattern.

A method in a user equipment for creating a demodulation reference signal for transmission when being served by a base station, the method comprising:

• receiving a plurality of configuration parameters from the base station, said configuration parameters indicating a UE-specific base sequence and a UE-specific cyclic shift hopping pattern, generating the demodulation reference signal based on at least one of the UE-specific base sequence and the UE-specific cyclic shift hopping pattern, and
• transmitting the generated demodulation reference signal.

A user equipment adapted to create a demodulation reference signal for transmission when being served by a base station, the user equipment comprising:

• a transceiver circuit adapted to receive a plurality of configuration parameters from the base station, said configuration parameters indicating a UE-specific base sequence and a UE-specific cyclic shift hopping pattern, and
• a control circuit adapted to generate the demodulation reference signal according to at least one of the UE-specific base sequence and the UE-specific cyclic shift hopping pattern, wherein the transceiver circuit is further adapted to transmit the generated demodulation reference signal.