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Wireless resource allocation method of ofdma system in high-speed scene

A wireless resource and allocation method technology, applied in the transmission system, wireless communication, digital transmission system, etc., can solve the problems of high power consumption, inefficient resource allocation algorithm, waste of resources, etc.

Active Publication Date: 2016-02-24
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to address the mixed data streams that contain multiple quality of service requirements. The existing solutions consume relatively large power, waste resources to a certain extent, and cause the inefficiency of resource allocation algorithms. A high-speed Wireless resource allocation method of OFDMA system in scenarios

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  • Wireless resource allocation method of ofdma system in high-speed scene
  • Wireless resource allocation method of ofdma system in high-speed scene
  • Wireless resource allocation method of ofdma system in high-speed scene

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0043] Preferred embodiments are described in detail. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0044] Concrete realization process of the present invention is: figure 1As shown, the passengers on the train communicate directly with the base station on the roadside. Consider a single-cell cellular OFDMA system with K 1 delay tolerant users and K 2 delay-sensitive users, L={1,2,…,L} subcarriers, where each subcarrier can only be assigned to one user, define {C} ij =c k,l is the allocation matrix of subcarriers, if c k,l =1, then the lth subcarrier is assigned to user k, otherwise c k,l =0, the total transmission bandwidth is B. Usually, a data flow is usually a mixed data flow, that is, data packets constituting the data flow need to meet differe...

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Abstract

The invention relates to an optimization method in the technical field of wireless communication and particularly relates to a wireless resource allocation method of an OFDMA (Orthogonal Frequency Division Multiple Access) system under a high-speed scene. The method comprises the following steps of step 1, collecting all user information in the system; step 2, dispatching data packets to different buffers according to the time delay QOS (Quality of Service) requirement; step 3, converting the time delay QoS requirement into link velocity information of a physical layer by virtue of a queuing theory; step 4, determining a resource allocation optimization model according to the velocity constraint condition, block constraint condition and total transmission power constraint condition of the physical layer; step 5, firstly performing priority sequencing on a user queue according to the time delay QoS requirement, then performing preferential distribution on blocks according to the priority sequencing by users, and finally performing power allocation; and step 6, performing power allocation according to an optimal solution obtained in the step 5. According to the wireless resource allocation method, frequency spectrum allocation based on the blocks is adopted, so that the influence of Doppler frequency shift is reduced; and resources are fully utilized, so that the system performance is improved.

Description

technical field [0001] The present invention relates to an optimization method in the technical field of wireless communication, in particular to a method for allocating wireless resources of an OFDMA system in a high-speed scenario. Background technique [0002] With the opening and application of high-speed railways and expressways, people have paid great attention to mobile communication in high-speed environments, and the running speed of high-speed trains will reach 350-500km / h, and the amount of communication data between trains and ground on high-speed railways will also increase. There will be more and more passenger-based broadband data services, and gradually become the main service of high-speed railway broadband wireless access. During the several hours of riding a high-speed train, passengers need to be in a real-time "information online" state. The high-speed train cannot become an "information island", so passengers must be able to keep in touch with the outsi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04W72/04
Inventor 毛丽娜徐少毅
Owner BEIJING JIAOTONG UNIV
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