Sequence mapping for lte/lte-a with unlicensed spectrum

A method of wireless communication, comprising:

• receiving, at a user equipment (UE), a reference signal from a base station at a first subframe;
• detecting, by the UE, a reference signal sequence in a fixed set of resource blocks (RBs) around a predetermined common frequency, wherein the reference signal sequence is independent of a system bandwidth;
• generating, by the UE, a channel estimate based on the reference signal sequence;
• and
• decoding, by the UE, a bandwidth information bearing signal received from the base station using the channel estimate.

An apparatus configured for wireless communication, the apparatus comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor,
• wherein the at least one processor is configured:
• to generate, at a base station, a reference signal for a first subframe, wherein the configuration of the at least one processor to generate includes configuration to center a first reference signal sequence for a fixed set of resource blocks (RBs) around a predetermined common frequency;
• and
• to transmit, by the base station, the reference signal in the first subframe to a user equipment (UE).