User access and power distribution method suitable for heterogeneous wireless cellular network

The invention discloses an energy efficiency optimization method based on user access and power distribution for the uplink of a heterogeneous wireless cellular network. Firstly, an energy efficiency-based user access policy is provided due to that a micro base station has the characteristic of low power consumption, so that a user can be unloaded from a macro base station to increase the energy efficiency of the system; secondly, targeting at system energy efficiency optimization, the optimal solution of the target problem cannot be obtained directly in a multi-user multi-carrier scene under the constraint conditions of the minimum rate and the maximum transmitting power, and therefore, a suboptimum scheme united with subcarrier scheduling and user transmitting power distribution is provided; the scheme is characterized in that the user can adaptively adjust the transmitting power of the occupied subcarrier according to the own channel information and the goal of optimizing the system energy efficiency is achieved at last.