Date Added: Dec 2011
IEEE 802.16j mobile multi hop relay WiMAX networks is created to compete with cable access networks. In this paper, the authors have conducted a survey on Relay technologies in IEEE 802.16j networks. They have also conducted detail survey on technical issues in the physical layer, MAC-common part sub-layer, and MAC-security sub-layer of IEEE 802.16j. The issues they have discussed are data forwarding schemes such as tunnel based data forwarding scheme, channel ID based data forwarding scheme, frame structure for transparent mode and non-transparent relay mode, link adaptation, Tunneling such as management tunneling and transport tunneling, which belongs to physical layer.