Broadband PLC seems to be gaining popularity as an access network technology so that the standardization efforts are rising notably. Broadband PLC gives the opportunity of delivering services such as telephony, TV and Internet through the power line, but also entails managing the Quality of Service that these applications need. In this paper, a centralized Quality of Service architecture for PLC access networks based on a QoS Broker is proposed. This architecture will allow for better managing of the QoS in the PLC domain and it should facilitate the interoperability with other technology domains. PLC Qos Broker architecture must be integrated with the core network in order to attain end-to-end QoS.