  Infrastructure sharing is a widely discussed and implemented approach and is
successfully adopted in telecommunications networks today. In practice, it is
implemented through prior negotiated Service Level Agreements (SLAs) between
the parties involved. However, it is recognised that these agreements are
difficult to negotiate, monitor and enforce. For future 6G networks, resource
and infrastructure sharing is expected to play an even greater role. It will be
a crucial technique for reducing overall infrastructure costs and increasing
operational efficiencies for operators. More efficient SLA mechanisms are thus
crucial to the success of future networks. In this work, we present "BEAT", an
automated, transparent and accountable end-to-end architecture for network
sharing based on blockchain and smart contracts. This work focuses on a
particular type of blockchain, Permissioned Distributed Ledger (PDL), due to
its permissioned nature allowing for industry-compliant SLAs with stringent
governance. Our architecture can be implemented with minimal hardware changes
and with minimal overheads.
