Patent ID: 8761195

Claim:
A method, comprising: storing data related to reference signal sequences, to form a desired cyclic shift separation between reference signal sequences, and to support a tree-based bandwidth assignment, the data being received from a user interface or from a base station; creating an uplink message to be transmitted to the base station, the created uplink message comprises a sounding reference signal based on the stored data; receiving uplink scheduling grant signal via downlink from the base station in response to the transmission of the uplink message; transmitting to the base station uplink data transmission responsive to the received uplink scheduling grant signal; forming the sounding reference signal based on existing demodulation reference signals; selecting the sounding reference signal to support the tree-based bandwidth assignment; adapting the sounding reference signal to provide maximum cyclic shift separation; reserving sufficient bandwidth at least for physical uplink control channel when forming the sounding reference signal based on existing demodulation reference signal signals; selecting a bandwidth allocation based on discrete Fourier transforms and repetition factor sizes when forming the sounding reference signal based on existing demodulation reference signal signals; and configuring the maximum cyclic shift separation between eight cyclic shifts to result in a sounding reference signal sequence length divisible by eight when a bandwidth of the sounding reference signal is a multiple of four resource blocks.