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

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...

AI Technical Summary

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 physical layer, the packet is usually assumed to be infinitely long, but in the actual system, the arrival of data packets is random, so it will lead to waste of resources, reduce the utilization of spectrum resources and the QoS level of users

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