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Backhaul requirements for inter-site cooperation in heterogeneous LTE-Advanced networks

: Jungnickel, V.; Manolakis, K.; Jaeckel, S.; Lossow, M.; Farkas, P.; Schlosser, M.; Braun, V.


Kim, Dong-In (Ed.) ; Institute of Electrical and Electronics Engineers -IEEE-:
IEEE International Conference on Communications Workshop, ICC 2013. Vol.2 : Budapest, Hungary 9-13 June 2013
Piscataway, NJ: IEEE, 2013
ISBN: 978-1-4673-5753-1 (online)
ISBN: 978-1-4673-5751-7 (print)
International Conference on Communications (ICC) <2013, Budapest>
Fraunhofer HHI ()

In this paper, we provide an overview on backhaul requirements in mobile networks featuring inter-site cooperation. We consider a heterogeneous deployment, where small cells are embedded into macro-cells. For reducing inter-cell interference, we consider intra- and inter-site joint transmission (JT)-coordinated multi-point (CoMP) in fully flexible cooperation clusters. Backhaul traffic for a macro-cell site scales linearly with the number of small cells and multiplicative by introducing cooperation. All features in LTE-Advanced together push the backhaul traffic up to 100 Gbit/s per site. JT-CoMP is sensitive to the feedback delay.We consider an exemplary rural fiber to the home (FTTH) network as mobile backhaul and find that delays between adjacent sites are below 1 ms. Impairment effects due to the delay can be reduced by feedback compression, shorter delays in the air interface and Doppler-delay based channel prediction.