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This paper describes the design of mobile wavelength-division multiplexing (WDM) backhaul access networks supporting physical inter-base- station (inter-BS) links for LTE-Advanced and beyond systems, especially coordinated multipoint (CoMP) transmission/reception. The proposed inter-BS links are fully compatible to conventional WDM-passive optical network technologies and capable of establishing a dedicated high capacity and low latency optical link between adjacent base stations. The primary application is a CoMP system that requires data and/or information exchange among multiple base stations for cooperatively serving mobile users. Simulation results verify that the proposed inter-BS links enable more base stations to join CoMP by reducing link latency.
Choi et al. (2011) studied this question.