Novel Energy Efficiency Optimization Method for Cellular Downlink Communication

Abstract

The invention discloses a novel cellular downlink communication energy efficiency optimization method. The novel cellular downlink communication energy efficiency optimization method comprises that: a base station distributes a relay channel; a base station auxiliary link receiving terminal node adjusts power of an emitting terminal; and a data receiving mode is determined. The novel cellular downlink communication energy efficiency optimization method can change a centralized mode of base station operation into a distribution mode with assistance of the base station. The novel cellular downlink communication energy efficiency optimization method reduce the load of the base station, reduces requirements for configurations of a user device, avoids co-frequency interference in one hop communication range, optimizes link energy efficiency, reduces overhead on searching a suitable relay and constructing a transmission path, guarantees that the established transmission path has a better capability of sustaining service and improves communication quality.

Description

technical field [0001] The invention specifically relates to a novel cellular downlink communication energy efficiency optimization method. Background technique [0002] With the popularization of mobile Internet services such as new media, augmented reality, virtual reality, and mobile cloud, the internal demand of the Internet of Everything and the rapid development of the Internet of Things market, the next generation of mobile communication networks must focus on improving energy efficiency and spectrum efficiency. The D2D communication mode is widely recognized as a feasible technology to improve the energy and spectrum efficiency of the cellular network. Its main functions are as follows: 1) Geographically adjacent communication pairs can directly transmit data through the D2D mode, reducing the proximity of the base station. Regional data transfer volume, thereby improving the ability to provide traffic relay services for long-distance communication pairs; 2) Cell edg...

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Problems solved by technology

Therefore, there are following problems: 1) the unlicensed free spectrum is not controlled by cellular base stations, which may lead to poor service quality, 2) devices with at least two types of wireless interfaces (e.g., LTE and WiFi) can use out-of-band D2D communication involves issues such as power management between different types of wireless interfaces, decoding and encoding of data packets of different wireless communication protocols, and more complex discovery and connection settings between D2D users. Therefore, the configuration requirements for user equipment are relatively high.

[0004] When the total amount of channel resources in a cell is given and the maximum transmit power of the base station is limited, what is the upper limit of the downlink throughput that can be provided for a large number of randomly occurring user requests? Usually this problem belongs to the NP-hard category, and there are different approximate solutions. There is an exhaustive search greedy algorithm proposed in the literature. Receive directly from base station? Or choose a D2D relay node to help it forward from the base station? Although this type of method is simple to implement, there are still some problems to be solved: 1) The base station runs the greedy algorithm of the exhaustive search of the entire network, which causes the base station to be overloaded; 2) The use of out-of-band D2D communication has higher requirements for user equipment configuration; 3) It is stipulated that each downlink data receiving node can select at most one D2D relay node, which may not be able to meet the downlink throughput requirements of the cellular edge nodes far away from the base station or nodes within the non-line-of-sight range; 4) The power of the transmitting node is not adjusted, and the cellular There is still room for improvement in communication energy efficiency; 5) The energy reserve level of the D2D relay node is not constrained, and it is difficult to guarantee the continuous service capability of the established transmission path

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