From what i have read it appears to be a capable stand alone
but works in a group as well......but comments both from
the american side & russian side have implied that the
radar station was taken out previously...so the US took
the view Russia must have helped,while the Russians took the
view that Ukraine must have done it....
"A standard Buk battalion consists of a command vehicle, target acquisition radar (TAR) vehicle, six transporter erector launcher and radar (TELAR) vehicles and three transporter erector launcher (TEL) vehicles. A Buk missile battery consists of two TELAR and one TEL vehicle. The battery requires no more than 5 minutes to set up before it is ready for engagement and can be ready for transit again in 5 minutes. The reaction time of the battery from target tracking to missile launch is around 22 seconds."
"As a result of this visit the developers came to the conclusion that each Buk transporter erector launcher (TEL) should have its own fire control radar rather than being reliant on one central radar for the whole system as in Kub.[8] The result of this move from TEL to transporter erector launcher and radar (TELAR) was a system able to engage multiple targets from multiple directions at the same time."