A communication network system and related devices and method of monitoring in a mobile radio communications network environment direct communications between first and second mobile communication devices to provide to the network an indication of link-quality of the direct communication, wherein the network is arranged to configure at least one of the mobile radio communication devices with a link-quality parameter reference value, the said at least one mobile radio communications device can report to the network if it determines, relative to the said reference value, that the link-quality of the direct communication is insufficient, and if required the network can subsequently control communication between the said first and second mobile radio communication devices responsive to the reporting the received from the said at least one mobile radio communications device, or the network can employ the reporting from the said at least one mobile radio communications device for network planning/optimization purposes.