Abstract
Reference signals configured for use with extension carriers and/or carrier segments are described. Reference signals for extension carriers and/or carrier segments may include demodulation reference signals (e.g., user equipment-specific reference signals), cell-specific reference signals, and channel-state information reference signals. Methods, systems and apparatuses for configuring extension carriers and/or carrier segments with user equipment-specific reference signals (e.g., positioning one or more user equipment-specific reference signal symbols in extension carriers and/or carrier segments) are described.
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