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To assure a good channel state information (CSI) in
the uplink users need to send sounding reference signals along
the entire bandwidth. This task is challenging in a Carrier Aggregation
framework, as the time period between two consecutive
measurements will rise due to the increased available bandwidth.
This leads to outdated information about the radio channels,
and as a consequence a poorer link adaptation is carried
out. In order to avoid this situation a inter cell interference
coordination method to improve the CSI reliability is presented.
This is particularly important for power limited users. On the
one hand the interference variability perceived in reception is
reduced by allocating resources in a controlled manner, and on
the other hand by reducing the available bandwidth sounding
measurements are more frequent. Results show that the entire
CSI accuracy can be improved and so does the overall cell
CitationLema, M.; Garcia-Lozano, M.; Ruiz, S. Sounding reference signals management for CSI improvement in LTE uplink with carrier aggregation. A: MC and Scientific Meeting. "Proceedings of the 11th IC1004 MC and Scientific Meeting (COST IC1004)". Krakow: 2014.
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