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Method for minimizing downlink transmission time delay based on NOMA-MEC system

A transmission delay and minimization technology, applied in the field of communication, can solve problems such as delay and energy efficiency imbalance, and achieve the effect of solving transmission delay and system energy consumption imbalance, strong scalability, and low complexity

Active Publication Date: 2020-06-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] Purpose of the invention: The present invention aims at the problem of unbalanced delay and energy efficiency in the downlink transmission process of the existing NOMA-MEC system in a multi-user scenario, and proposes a method for minimizing the downlink transmission delay based on the NOMA-MEC system. Under the common constraints of computing tasks, power and energy consumption, the transmission delay of the system can be minimized

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  • Method for minimizing downlink transmission time delay based on NOMA-MEC system

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with embodiment and accompanying drawing, but the implementation of the present invention is not limited thereto.

[0032] Step 1: Build a system model. The communication system targeted by the present invention has a base station equipped with a mobile edge computing server and K mobile users, wherein both the base station and the users are equipped with a single antenna for sending and receiving information. When users offload computing tasks and download computing results from the MEC server, the NOMA method is used for transmission. In the downlink transmission of the system, the base station needs to transmit the calculation result of the user to the user equipment. Here, the calculation result of the task to be transmitted by the kth user is recorded as I k , k ∈ {1,...,K}. At the same time, denote the corresponding transmission power as p k , k ∈ {1,...,K}. Then, the expression of the trans...

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Abstract

The invention discloses a downlink transmission time delay minimization method based on an NOMA-MEC system, and the method comprises the steps: firstly building a system model of a base station with amobile edge computing server and K mobile users, and enabling the base station and the users to be provided with a single antenna for transmitting and receiving signals; deducing a signal-to-noise ratio, a transmission bit constraint, a power constraint and an energy consumption constraint of the user according to the transmission characteristics of the downlink NOMA and the characteristics of the MEC system; then, a mathematical model with the purpose of minimizing system time delay is constructed; and finally, designing an optimization algorithm to obtain an optimal resource allocation scheme with the purpose of minimizing the time delay. According to the method, the problem that the time delay and the energy efficiency of an existing NOMA-MEC system are unbalanced in the downlink transmission process in a multi-user scene is solved, and the transmission time delay of the system can be reduced to the minimum under the common constraint of the calculation task, the power and the energy consumption.

Description

technical field [0001] The invention belongs to the technical field of communication, more specifically, it is a method for minimizing downlink transmission time delay based on NOMA-MEC system. Background technique [0002] At present, with the rapid growth of communication data and the increasing demand of users for high-quality experience, mobile communication networks are facing huge challenges. The emergence of Mobile Edge Computing (MEC) technology has effectively alleviated this pressure. As one of the important technologies of the fifth-generation mobile communication system, MEC deploys a service platform with communication, computing and storage functions to the edge of the network, so that mobile users can offload their computing-intensive tasks to the MEC platform, and the MEC server performs calculate. Compared with user equipment, MEC servers have higher computing power and can quickly process a large amount of task data, thereby greatly reducing delays in netw...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/02H04W28/18
CPCH04W24/02H04W28/18Y02D30/70
Inventor 王保云李想
Owner NANJING UNIV OF POSTS & TELECOMM
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