Coexistence of wireless personal area network and wireless local area network with reduced interference

A first wireless transceiver apparatus for operating in a part of the RF spectrum which is shared with a co-located second wireless transceiver apparatus, the first wireless transceiver apparatus comprising: a wireless transceiver unit; an arbitration interface for interfacing with an arbitration entity which arbitrates access to the shared part of the RF spectrum between the first wireless transceiver apparatus and the second wireless transceiver apparatus; wherein the arbitration interface is adapted to signal time periods when the wireless transceiver unit is operationaI or requests to be operational; and wherein the arbitration interface is adapted to signal data about the first wireless transceiver apparatus during other time periods.