Throughput Maximization for Multiple D2D Group Communications Underlaying Cellular Networks

Table 1

Specific steps of the spectrum resource optimization algorithm.

Steps	Content
1	According to the geographic location of D2D pairs, the clusters are clustered with cellular users as the center.
2	The interference tolerances of cellular users and D2D users are set and the SINR is calculated according to formulas (1) and (2).
3	Under the condition of ensuring the maximum throughput demand of cellular users, the bandwidth share of cellular users is determined according to formula (6).
4	Based on the “first-mover advantage” of the Rubinstein’s bargaining game model, the first bidder gets a greater benefit (share) than the second bidder. Sort each D2D according to its SINR, and divide the remaining bandwidth share according to formula (10).
5	According to the graph theory model, under the condition of ensuring normal communication between cellular users and D2D pairs, the number of user access is optimized by formulas (13) and (14).