Joint optimization method of user access and power control in cooperative heterogeneous networks

Abstract

The invention discloses a user accessing and power control combined optimization method in a cooperative heterogeneous network, wherein the user accessing and power control combined optimization method belongs to the technical field of wireless communication. The user accessing and power control combined optimization method comprises the steps of accessing downlink channel information of each base station to all users, calculating a precoded vector energy and an equivalent channel energy, and then sharing the precoded vector energy and the equivalent channel energy through a return link; then collecting a user data rate requirement, the maximal power of each base station, number of transmitting antennae and the equivalent channel energy which is shared by the base station end through the return link by a central processing unit, and converting a related user accessing and power control combined optimization method to a convex optimization problem for being solved; and transmitting the solved power control result and user accessing result of each base station to each base station through the return link. The user accessing and power control combined optimization method has advantages of effectively balancing the service load of each cell in the network, greatly reducing the total transmission power of the system and supporting a higher user data rate requirement. The user can randomly access a plurality of base stations.

Description

technical field [0001] The invention relates to a user access and power control design method in a heterogeneous network, and belongs to the technical field of wireless communication. Background technique [0002] Heterogeneous network is one of the key technologies of the fifth generation mobile communication system (5G). By deploying a large number of micro base stations within the coverage of macro base stations, such as micro base stations, pico base stations, femtocell ), etc., can effectively enhance the coverage of hotspot areas and improve the throughput of the entire cellular network (reference documents [1]-[2]). But at the same time, the introduction of these small base stations also makes the heterogeneous network have a more complex interference environment than the homogeneous network, so the effective suppression of inter-cell interference is a prerequisite for realizing the performance potential of the heterogeneous network (reference document [2]) . Multi-...

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