  This paper studies the sensing base station (SBS) that has great potential to
improve the safety of vehicles and pedestrians on roads. It can detect the
targets on the road with communication signals using the integrated sensing and
communication (ISAC) technique. Compared with vehicle-mounted radar, SBS has a
better sensing field due to its higher deployment position, which can help
solve the problem of sensing blind areas. In this paper, key technologies of
SBS are studied, including the beamforming algorithm, beam scanning scheme, and
interference cancellation algorithm. To transmit and receive ISAC signals
simultaneously, a double-coupling antenna array is applied. The free detection
beam and directional communication beam are proposed for joint communication
and sensing to meet the requirements of beamwidth and pointing directions. The
joint time-space-frequency domain division multiple access algorithm is
proposed to cancel the interference of SBS, including multiuser interference
and duplex interference between sensing and communication. Finally, the sensing
and communication performance of SBS under the industrial scientific medical
power limitation is analyzed and simulated. Simulation results show that the
communication rate of SBS can reach over 100 Mbps and the range of sensing and
communication can reach about 500 m.
