Resource allocation of wireless backhaul in heterogeneous network based on the large-scale MIMO

The small cell network and large-scale MIMO system are considered as two important technologies of 5G communication system. In this paper, one two-layer heterogeneous network composed of a dense small cell layer covering the large cell layer is proposed. To enable the base station in large cell to effective estimate the channel, the network adopts R-TDD protocol. The base station in large cell uses the large-scale MIMO technology, which not only serves the user and equipment units in large cell but provides AP in small cell with wireless backhaul. These APs in small cell serve their associated users only. The base station adopts RZF and projection technology at the time of downlink transmission to avoid interference with the uplink transmission, and adopts LMMSE detection technology at the time of uplink transmission to eliminate interference. As a result, we have obtained the deterministic expression that traverses the uplink and downlink rates, and then optimize bandwidth and time slot allocation by these. In addition, the simulation results show that these deterministic rate expressions are accurate, and the method proposed for resource allocation may effectively improve system performance.