Scaleable network multicast for cooperative base stations

Abstract

Abstract-Cooperative joint transmission and detection algorithms have a high potential to increase the capacity of cellular radio systems. This paper investigates efficient network layer protocols to realize such cooperation over a heterogeneous, bandwidth-limited backhaul. Target systems are MIMO-OFDM cellular communication systems with flat hierarchy (no central unit), and we take 3GPP LTE as example. The proposed architecture uses IP multicast for stations receiving the same information and is scaleable by dynamically cooperating only on frequency subbands. SINR and mobility thresholds are used to first cooperate for critical cell-edge users with low mobility, where most interference reduction gain is to be expected.

Synchronization of cooperative base stations

“…This is a challenging problem which has not been previously addressed, to the best of our knowledge. It has been proposed [17] to use existing multicast protocols to distribute the data more efficiently to the set of cooperative base stations forming a multicast group. But it has not been recognized that the data packets arrive asynchronously at different nodes after passing through an unknown network.…”