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qoe-based downlink resource allocation method of ofdma network

A technology of resource allocation and downlink, which is applied in the direction of multiple use of transmission paths, digital transmission systems, electrical components, etc., and can solve problems that cannot directly reflect users' subjective feelings and satisfaction with services, and poor experience of video interruptions, etc.

Active Publication Date: 2018-06-15
ZHEJIANG UNIV
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Problems solved by technology

However, QoS network indicators cannot directly reflect the user's subjective experience and satisfaction with the service. For streaming media services, even if there is no transmission error during the user's viewing process, it does not mean that the user can obtain a better service. Quality of experience, because there may be a bad experience caused by video interruption during the process

Method used

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  • qoe-based downlink resource allocation method of ofdma network
  • qoe-based downlink resource allocation method of ofdma network
  • qoe-based downlink resource allocation method of ofdma network

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Embodiment Construction

[0061] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0062] Such as figure 1 As shown, this example adopts a single-cell OFDMA network downlink system in Frequency Division Duplex (FDD) mode. In channel modeling, each subcarrier channel is a 6-path independent Rayleigh fading channel, and the channel power attenuation characteristics obey an exponential distribution, with a mean of Where κ is a constant, its value is set to -128dB, x is called the path loss index, its value is set to 3.76, d m is the distance from the user to the base station, in km; there are 4 users in the system, which are randomly and evenly distributed around the base station; the total network bandwidth B is 0.5MHz, divided into K=32 subcarriers, and the noise power spectral density is N 0 =1e-17W / Hz; total system power P total 1W;

[0063] This example is implemented through the following steps:

[0064] Step 1. Est...

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Abstract

The invention relates to a QoE-based OFDMA network downlink resource allocation method. The method of the present invention first establishes a downlink model of a single-cell multi-user ODFMA network, and then establishes a QoE evaluation model for streaming media services to obtain the transmission rate constraints of each user; the allocation of downlink resources in an OFDMA system based on QoE constraints is described as an optimization problem, Then transform it into a convex optimization problem with continuous variable linear constraints, use the subgradient iterative method to solve the convex optimization problem, and substitute the obtained optimal value of Lagrange multiplier into the optimal value formula of subcarrier and subcarrier power allocation, and obtain Optimal values ​​for system subcarriers and subcarrier power allocation. The method of the invention comprehensively considers the minimum rate requirement for guaranteeing the user's QoE and the maximum QoE rate requirement for avoiding resource waste, and can give consideration to both the improvement of the user's QoE and the effective utilization of resources.

Description

technical field [0001] The invention belongs to the technical field of wireless resource management in wireless communication, and in particular relates to a QoE-based OFDMA system downlink resource allocation method. Background technique [0002] With the development of wireless communication technology and the popularization of intelligent terminal equipment, streaming media services account for an increasing proportion of communication data volume. The majority of wireless terminal users serve as objects of streaming media services, and their quality of experience (Quality of Experience, QoE) and satisfaction with services are the most concerned issues of network operators and service providers. [0003] On December 4, 2013, the Ministry of Industry and Information Technology officially issued TD-LTE licenses to the three major domestic operators, marking China's entry into the 4G era. In the 4G communication system, Orthogonal Frequency Division Multiple Access (OFDMA) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/08H04L5/00
CPCH04W72/542
Inventor 陈惠芳谢磊于凡格钱力言金栖西
Owner ZHEJIANG UNIV
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