Lb is the interface between BSC and SMLC (Serving Mobile Location Center).
In GSM, the Serving Mobile Location Center (SMLC) node is responsible for managing the overall co-ordination and scheduling of resources required to perform positioning of a mobile, and calculating the final location estimate and
accuracy.
In GSM, a BSS based SMLC supports positioning via signaling on the Lb interface to the BSC serving the target MS.
Signalling on this interface uses BSSAP-LE, which is specified in GSM 09.31.
See for more info the ETSI recommendation TS 123 002.
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