2026-04-19T11:30:38Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/849692026-01-21T06:16:59Zcom_2072_1033col_2072_452950

urn:hdl:2117/84969 Interference coordination method for CSI improvement in LTE uplink with carrier aggregation Lema Rosas, María Ángel García Lozano, Mario Ruiz Boqué, Sílvia Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Comunicacions mòbils Long-Term Evolution (Telecommunications) Long-term evolution (Telecomunicacions) ©2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Carrier Aggregation is an important feature in Long Term Evolution Advanced (LTE-A). It allows operators to provide larger operational bandwidths without the need of having a contiguous, large piece of spectrum. However, an increased bandwidth also needs a larger channel sounding to obtain channel state information (CSI), required for frequency domain scheduling and link adaptation. This constitutes a serious challenge for the uplink since wideband sounding reference signals cannot be transmitted by cell edge (power limited) users and hopped sounding requires a long time to sweep the entire transmission band, thus leading to outdated and less reliable CSI. Also, average interference and its variation in time can seriously jeopardize the CSI at the eNodeB. In this paper, we present an integration of inter cell interference coordination with CSI reporting by reducing the interference variability through controlled allocations. Results show that the entire CSI accuracy can be improved and so does the overall cell performance. Peer Reviewed Postprint (author's final draft) 2015 Conference report http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7194078 Open Access Institute of Electrical and Electronics Engineers (IEEE)