METHODS AND SYSTEMS FOR CSI-RS TRANSMISSION IN LTE-ADVANCE SYSTEMS
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United States of America Patent
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Issued Date -
Apr 18, 2013
app pub date -
Feb 17, 2011
filing date -
Feb 17, 2010
priority date (Note) -
Abandoned
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Abstract
A method of allocating resource elements in an orthogonal frequency division multiplexing (OFDM) system for transmission of a channel state information reference signal (CSI-RS) is disclosed. The method includes converting resource elements to a two-dimensional frequency-time domain. The converted resource elements can then be partitioned to units of a physical resource block (PRB), which can be one subframe, for example. It can be determined whether a portion of a PRB is being used by another signal; and if the portion of the PRB is not being used, it can be allocated for transmission of the CSI-RS. The CSI-RS can be transmitted at resource element locations determined by the resource elements available to the CSI-RS in a regular or a frequency-division duplexing (FDD) downlink subframe, for example. The CSI-RS can be transmitted in a downlink subframe configured as a Multi-Media Broadcast over a Single Frequency Network (MBSFN) or a non-MBSFN subframe.
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