QoS (Quality of Service) guaranteeing method of OFDMA (Orthogonal Frequency Division Multiple Access) system based on cross-layer optimization

Abstract

The invention provides a QoS (Quality of Service) guaranteeing method based on cross-layer united resource optimization for a full IP (Internet Protocol) OFDMA (Orthogonal Frequency Division Multiple Access) communication system of 3G-LTE (3G Long Term Evolution). Three protocol layers including a physical layer, an MAC (Media Access Control) layer and a call admission control layer are considered so that the quality of service of a plurality of services under a full IP condition is guaranteed. The method comprises the following steps: power and bit rate distribution of the physical layer and restriction on an upper layer by the physical layer; equivalent bandwidth distribution on the MAC layer and restriction on a CAC layer by the MAC layer; design of a CAC scheme. According to the method, the problems in the prior art that the suitability of MAC layer dispatching is only met by trying to optimize parameters of the physical layer by cross-layer resource distribution, and the quantity of users accessing to the system is not limited by the proper CAC scheme are solved; the long-time-delay queuing of a data packet is avoided, the QoS of the users is guaranteed better, and the resource utilization rate is improved.

Description

technical field [0001] The invention relates to a QoS guarantee method based on multi-layer joint resource allocation optimization, which belongs to the field of wireless communication. Background technique [0002] What the present invention researches is the resource allocation and QoS guarantee in the all-IP OFDMA system of 3G-LTE. At present, in the B3G / 4G wireless cellular mobile communication system, both OFDM and OFDMA are adopted as the basic physical layer technology. As a modulation technique, OFDM is suitable for practical multi-user mobile communication systems only when it is combined with other multiple access methods. The OFDMA technology formed by the combination of OFDM and FDMA technology is the most mainstream wireless multiple access solution for the downlink of the B3G / 4G system. OFDMA divides the entire system bandwidth into several orthogonal subcarriers, and several subcarriers are combined into one subchannel, and one user is assigned one or more s...

AI Technical Summary

Problems solved by technology

However, these studies are only limited to independent layers, and do not take into account the relationship between layers

For a wireless communication system with a time-varying channel, the optimization of only one layer is not enough to meet the user's QoS requirements.

The all-packet network characteristic of 3G-LTE has high spectral efficiency but poses a huge challenge to QoS guarantee

These studies only try to optimize the parameters of the physical layer to meet the suitability of the MAC layer scheduling to meet the user delay (dela y ) requirements

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