OFDMA-TDD Networks with Busy Burst Enabled Grid-of-Beam Selection

Interference aware user scheduling in fixed grid-of-beam (GoB) transmission is envisaged to significantly benefit from the receiver initiated busy burst (BB) protocol. Fixed GoB scheduling relies on the knowledge of the location of the intended users as well as the vulnerable users which effectively is provided by the BB protocol via exploitation of channel reciprocity. This paper studies the hybrid BB and GoB (BB + GoB) approach in a Manhattan environment. The new proposed hybrid interference avoidance scheme with an underlying score based scheduler is evaluated by means of system level simulations, and is compared against a pure GoB approach with the same scheduler as well as the BB based interference avoidance techniques applied to omnidirectional antennas. The results show an improvement in both system throughput and fairness (defined as cell edge user throughput). In particular, system throughput of up to 238.5 Mbps/cell or user throughput of up to 8.88 Mbps/user for the lower 10%-ile of users are shown to be feasible. In particular, the hybrid BB + GoB scheme exhibits a 16-fold improvement at the lower 10%-ile compared to pure GoB technique.