Spectrum Sharing for LTE and DTT: Study case: Indoor LTE-A Femtocell in DVB-T2 service area

Autores UPV
Año
CONGRESO Spectrum Sharing for LTE and DTT: Study case: Indoor LTE-A Femtocell in DVB-T2 service area

Abstract

In previous works presented in COST IC1004 (TD-14-09042, TD-14-10034) we analyzed how much LTE signals interfering DTT receivers affect the quality of the TV services, varying different parameters of both technologies, when both systems operate in adjacent bands. To quantify the interference problem, protection ratios were calculated for several LTE configurations, located in the lower part of the assigned band, and either for downlink and uplink cases (TD-14-09042). The coexistence problem was studied in both 700 and 800 MHz bands, always evaluating the interference of LTE signals into DTT services. After considering several coexistence scenarios and using the measured protection ratios, some planning studies were performed (TD-14-10034). In addition, potential approaches for coexistence were proposed in order to guarantee the quality of services in DTT. In this paper we study a particular case which goes a step beyond the previous ones, as it aims with sharing the same frequency band in the same area between LTE-A and DVB-T2 technologies. The scenario is emulated with professional equipment in laboratory, and assumes that a DVB-T2 transmitter provides coverage for fixed rooftop reception as a primary service, to a building in which a LTE-A femtocell is installed indoors for local coverage. Our results provide the technical restrictions of the LTE-A Femtocell, mainly on the maximum allowable Effective Isotropic Radiated Power (EIRP) that could transmit on the DTT band in terms of the carrier separations, from co-channel to adjacent band.