Patent ID: 7047028

Claim:
A main-remote radio base station system, comprising: N remote radio units, N being an integer equal to or greater than 2, each remote radio unit including a remote digital optical interface; a main unit including a main digital optical interface; and an optical fiber for communicating information between the main unit and the remote units, the optical fiber including a first fiber path for communicating digital information from the main unit to the remote units and a second fiber path for communicating digital information from the remote radio units to the main unit, each of the first and second fiber paths including one or more optical links; wherein the main and remote units are coupled together in a series configuration by the optical fiber, and wherein the main and remote digital optical interface units are configured so that information from the main unit is sent over the first fiber path to the remote units at an advanced time relative to a time reference so that the same information is transmitted over a radio interface by the serially-configured remote units at substantially the same time despite different delays associated with each remote radio unit and the main unit receives the same information from each of the serially-configured remote units over the second fiber path at substantially the same time despite different delays associated with each remote radio unit.