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This work proposes a cross-layer FCA channel assignment scheme designed to efficiently handle multimedia communications in an heterogeneous traffic environment. The scheme has been designed to enable QoS priorisation of certain traffic types or user classes. To do so, the proposed technique provides mechanisms to reserve the use of given channels in interfering co-channel cells. The paper details the scheme's configuration and shows the achievable trade-offs between QoS priorisation and system performance.