High-level concepts and requirements for LTE (Long Term Evolution) Home eNBs have been discussed and set in 3GPP (3rd Generation Partnership Project). In one scenario, Home eNBs may be deployed and operated in a carrier dedicated to their kind of eNB types or radios in a coordinated or an uncoordinated fashion. In another scenario, Home eNBs may be deployed and operated in the same carrier as that of macro eNBs, which are providing services for a wide area. In this case, Home eNBs and macro eNBs may share the same carrier and the local area coverage of Home eNBs may fall into the coverage of a wide-area macro eNB.
However, the deployment of home eNBs in a large number over a certain local area in homes or office buildings presents many technical challenges. These include interference problems between the home eNBs and coordination possibilities for efficient flexible spectrum use, for instance.