With the dense deployment of small cells in the next generation of mobile networks. the users from different tiers suffer from high downlink interferences. In this paper. we propose a game theoretic approach for joint co-tier and cross-tier collaboration in heterogeneous networks and analyze the relevance of the proposed scheme. https://www.jmannino.com/super-save-NFL-Chicago-Bears-Blast-iPhone-14-Plus-Skin-p41373-big-savings/