A cellular downlink throughput optimization method based on out-of-band d2d multi-hop relay

Abstract

The invention discloses a cellular downlink throughput optimization method based on an out of band D2D multi-hop relay. The method comprises the following steps: a base station determines the mode of each UE obtaining a cellular channel to receive data from the base station in three phases: preselecting a first relay, preselecting a second relay and verifying the link throughput of the preselected relays, wherein the mode comprises directly receiving data from the base station, receiving the data by selecting a relay to transfer the data and receiving the data by selecting two relays to transfer the data; in the phase of preselecting the first relay, the first relay is selected by comprehensively considering the improvement of the throughput and the residual energy level of the relay; in the phase of preselecting the second relay, the second relay is selected by setting an energy constraint threshold to ensure that the residual energy level of the second relay is not less than a corresponding value of the first relay; and in the phase of verifying the link throughput of the preselected relays, whether the preselected relay is abandoned or retained is determined according to whether the throughput is improved. By adoption of the cellular downlink throughput optimization method disclosed by the invention, the data receiving quality can be effectively improved, the throughput is effectively improved, the service life of the network is prolonged, and the computation and communication costs are reduced.

Description

technical field [0001] The invention belongs to the field of computer network applications and out-of-band (Outband) D2D (Device-to-Device) communication, and relates to a method for optimizing cellular downlink throughput through multi-hop relay assistance under energy constraints and delay constraints. Background technique [0002] The D2D technology is a key technology of the fifth-generation mobile communication network, which has the advantages of improving spectrum utilization, increasing system throughput, reducing energy consumption, and reducing base station (Base Station, BS) load, etc. In a cell, if a User Equipment (UE) is at the edge of the cell or blocked by obstacles, the quality of data it receives from the base station will be affected. By selecting another UE with a better location to act as a relay, and the relay receives data from the base station and forwards it to itself, the user equipment can alleviate this adverse effect, thereby improving data recep...

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Problems solved by technology

[0006] Regarding the use of out-of-band D2D communication mode to study throughput optimization, literature [2] proposed an opportunistic channel frame model under delay constraints, and implemented a greedy algorithm (D2DOpportunistic Relay with QoS Enforcement, DORE), but there are still the following problems to be solved: first, when selecting the user equipment as a relay, the remaining energy of the relay is not considered, so the network lifetime may not be guaranteed; second, DORE Obtaining relay UEs that meet the selection criteria through global search will lead to excessive communication and calculation overheads; Bit Error Rate (BER), making it difficult to obtain ideal throughput

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