1. A wireless transmit/receive unit (WTRU) for infrastructure communication in a wireless network via network base stations and for peer-to-peer communications with other such WTRUs comprising: transceiver components that are configured for selective operation in an infrastructure communication mode for infrastructure communication with a network base station and in a peer-to-peer communications mode for peer-to-peer communications with other WTRUs; and a transceiver controller configured to selectively control peer-to-peer mode communications with other WTRUs based on communication signals received in infrastructure communications with a network base station.