Radio resource distribution method based on utility in orthogonal frequency division multiple access (OFDMA) system

A wireless resource and allocation method technology, applied in the field of utility-based wireless resource allocation, can solve problems such as effective utilization of unfavorable resources, reduction of spectrum resource utilization, user QoS level, resource waste, etc.

Inactive Publication Date: 2013-04-24
XI AN JIAOTONG UNIV
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Problems solved by technology

Most of the traditional research on OFDMA resource allocation only focuses on the physical layer. However, the layered network structure is not conducive to the effective use of resources.
When only considering the optimization of the physi

Method used

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  • Radio resource distribution method based on utility in orthogonal frequency division multiple access (OFDMA) system
  • Radio resource distribution method based on utility in orthogonal frequency division multiple access (OFDMA) system
  • Radio resource distribution method based on utility in orthogonal frequency division multiple access (OFDMA) system

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Embodiment Construction

[0050] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0051] figure 1 It is a downlink resource allocation model for an OFDMA system. According to the channel state information fed back by users and the data queue state information of each user, the base station at the sending end allocates the data of different users to the most suitable subcarriers, and selects the modulation and coding scheme and allocates power for the subcarriers. The channel state information is obtained by The user feeds back to the base station through a dedicated channel, and the resource allocation result information is also transmitted to the user through a dedicated channel. After resource allocation, all data performs inverse fast Fourier transform (IFFT) and parallel-to-serial transform; a cyclic prefix is ​​inserted in front of each OFDM symbol. The OFDM symbols...

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Abstract

The invention discloses a radio resource distribution method based on utility in an orthogonal frequency division multiple access (OFDMA) system. Firstly, the radio resource distribution method provides all the users in system with utility functions, channel state information (CSI), time delay, business quality of service (QoS) index, data queue state information (QSI) and quantity of delivered data package by users are considered comprehensively into the utility function. Secondly, a resource distribution aim is established by using the sum of all the utility functions of each user on condition that total power of a base station and power distributed on every sub-carrier wave are limited. Lastly, the resource distribution aim is achieved by distributing resource to users according to the designed utility functions. Due to the fact that influences of multiple factors such as CSI, time delay, business QoS index, QSI and quantity of delivered data package by users are comprehensively considered in the utility functions, therefore, a better balance between system throughput, time delay character and fairness among users is achieved compared with traditional source distribution methods.

Description

technical field [0001] The invention belongs to the technical field of wireless resource allocation, and relates to a utility-based wireless resource allocation method in an OFDMA system. Background technique [0002] OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) is developed on the basis of OFDM technology. Its basic idea is to disperse high-speed data streams to multiple subcarriers for transmission. These subcarriers are mutually regular Handed in. Therefore, the symbol rate on the sub-carrier is greatly reduced, and the duration of the symbol is lengthened, so it can resist the delay extension and greatly reduce the inter-symbol interference. In OFDM modulation, each subcarrier is relatively independent, and each subcarrier can have its own specific modulation method and transmission power level. OFDMA is similar to conventional frequency division multiplexing FDMA, but FDMA needs a guard band, while OFDMA There is...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04W72/04
Inventor 李锋刘莹朱世华耿莉娜
Owner XI AN JIAOTONG UNIV
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