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Optimization method for auxiliary relay D2D communication system of single microcell

A communication system and cellular cell technology, applied in the field of communication systems, can solve the problems of low signal-to-interference-noise ratio of D2D links and inability to meet communication quality requirements, etc.

Active Publication Date: 2018-11-23
XIAMEN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, D2D communication is mainly suitable for users with close distances. When the communication parties are far away or the direct channel fading is serious, the D2D link SINR may be too small to meet its communication quality requirements.

Method used

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  • Optimization method for auxiliary relay D2D communication system of single microcell
  • Optimization method for auxiliary relay D2D communication system of single microcell
  • Optimization method for auxiliary relay D2D communication system of single microcell

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Embodiment Construction

[0050] Such as figure 1 As shown, the present invention provides an optimization method for a relay-assisted D2D communication system for a single cell. In the system where the optimization method is applied, there is a one-to-one relationship between D2D users and cellular users, that is, the spectrum resources of cellular users It can only be multiplexed by a single D2D user at most, and a D2D user can only multiplex the spectrum resources of one cellular user; a D2D user pair can select an idle cellular user as a relay for relay-assisted D2D communication, and D2D users need to meet the minimum quality of service Only then can D2D direct communication be performed.

[0051] Such as figure 2 Shown, method of the present invention comprises the following steps:

[0052] Step 1. The total transmit power of the system is expressed by the sum formula of transmit power of all users, then the total transmit power of the system can be expressed as:

[0053]

[0054]

[00...

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Abstract

The invention relates to an optimization method for an auxiliary relay D2D communication system of a single microcell. In the method, a problem is converted into D2D communication user uplink resourcedistribution and delay selection problem based on thee-dimensional distribution; the problem is converted into a two-dimensional distribution problem according to the thought of a Lagrange relaxationalgorithm, and the problem is solved through combining with a Hungary method. According to the method provided by the invention, under the premise of ensuring the communication quality of each link,the overall transmission power of each link within unit time of the system is optimized, and compared with common distribution strategies, the optimization method provided by the invention is greatlyreduced in energy loss.

Description

technical field [0001] The present invention relates to the technical field of communication systems, in particular to an optimization method for a relay-assisted D2D communication system of a single cell. Background technique [0002] With the rapid development and continuous evolution of cellular communication systems in the past 30 years, the access of massive terminal equipment and increasing user demands have brought huge challenges to the existing communication network architecture, and the problem of scarcity of spectrum resources has become increasingly serious. As one of the key candidate technologies for 5G, D2D communication technology has a unique role in alleviating the contradiction between the ever-increasing communication traffic and the shortage of cellular network spectrum resources, so it has attracted the attention of the industry. [0003] However, D2D communication is mainly suitable for users with close distances. When the communication parties are far...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/70H04W16/14H04W40/22H04W52/02
CPCH04W4/70H04W16/14H04W40/22H04W52/0203Y02D30/70
Inventor 林世俊陈小峰
Owner XIAMEN UNIV
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