mmWave beam management: SSB beams, tracking, recovery

SSB Beam Sweeping Fundamentals

Millimeter wave systems rely on narrow directional beams to overcome severe path loss, fundamentally changing how devices discover and connect to cells. The gNodeB transmits Synchronization Signal Blocks across multiple beam directions in a sweeping pattern. At mmWave, a cell may use sixty-four SSB beams to cover its sector, each pointing in a slightly different direction. The device measures received signal strength on each beam during the sweep and reports the best beam index to the network. This initial beam acquisition process determines which narrow beam direction provides the strongest…