Pseudo-random sequence mapping in wireless communications

摘要

Systems and methodologies are described that facilitate scrambling of downlink reference signals utilizing a pseudo-random sequence (PRS) corresponding to a primary synchronization code (PSC) and secondary synchronization code (SSC) combination. Utilization of the combination allows for orthogonal sequencing to be removed from the scrambling. This can be beneficial, for example, where resources required for orthogonalizing the reference signal outweigh the benefit of utilizing the orthogonal sequences. In such scenarios, selective scrambling can be utilized such that the orthogonal sequence or instead the PSC/SSC combination can be provided to leverage advantages of both mechanisms in the given scenarios.

主权项

1. A method for interpreting a downlink reference signal in a wireless communications network, comprising:
receiving a scrambled downlink reference signal from a transmitter, wherein the scrambled downlink reference signal is associated with primary and secondary synchronization codes usable to identify the transmitter; determining a cyclic prefix length for one or more subframes in the downlink reference signal; determining from the downlink reference signal a pseudo-random sequence used to scramble the downlink reference signal, wherein the pseudo-random sequence is based on the primary and secondary synchronization codes when the cyclic prefix length exceeds a specified threshold length; and descrambling a portion of subframes of the scrambled downlink reference signal according to the pseudo-random sequence, wherein each of the portion of the subframes has a cyclic prefix length that exceeds the specified threshold length.