A base station may transmit a control channel transmission during a configured discovery reference signal window on a shared spectrum. A user equipment (UE) may detect the control channel transmission from the base station during the configured discovery reference signal window on the shared spectrum. The UE may determine, in response to detecting the control channel transmission, expected synchronization signal block (SSB) positions within a maximum SSB burst length starting from the control channel transmission during the discovery reference signal window. The base station may transmit SSBs at the expected SSB positions within the maximum SSB burst length starting from the control channel transmission during the discovery reference signal window. The UE may measure SSBs at the expected SSB positions. The UE may conserve power by stopping measurements or entering a sleep mode after the expected SSB positions.