In a TDM/TDMA digital radio communications system a few selected ports are connected to a fixed common timing reference and designated as master ports. Each master port is assigned a hierarchical value of zero. Every other port is initialized a high hierarchical value before performing an autonomous...http://www.google.de/patents/US5363375?utm_source=gb-gplus-sharePatent US5363375 - Method and apparatus for synchronizing timing among radio ports in wireless communications systems using hierarchical scheme
