Dynamic resource block distributing method in long term evolution system

Abstract

The invention provides a dynamic resource distributing method used in an LTE-A (Long Term Evolution Advanced) system on the basis of resource blocks. In the dynamic resource distributing method, the sizes of time domains and frequency domains of the resource blocks are regulated in real time according to two parameters, i.e. a Doppler frequency shift and a multipath delay spread, of a channel; in the process of processing the resource blocks, each resource block is abstracted into one point, all subcarriers are equally treated inside the point, powers and bits are equally distributed, and a gain of the block is represented by an average value of gains of all carriers; and in the process of distributing the resource blocks, firstly, the best blocks are distributed for all users by using a greedy algorithm, and then a priority is established for each user for the blocks shared by a plurality of users, so that each user is mediated, and thus, not only is the complexity reduced, but also the fairness of each user is ensured.

Description

technical field [0001] The invention relates to a scheduling scheme for physical layer resource block allocation in a next-generation mobile communication system, and belongs to the technical field of mobile communication. Background technique [0002] In order to meet people's high-speed and large-capacity requirements for mobile communication systems, the next-generation mobile communication system chooses Orthogonal Frequency Division Multiplexing (OFDM) as one of its key technologies, which divides a frequency band into Several small frequency bands that are orthogonal to each other are independently modulated, so that the spectral efficiency is greatly improved; in addition, this technology has a strong ability to resist multipath and intersymbol interference. [0003] However, since the number of sub-carriers increases sharply after the sub-bands are divided, the complexity of the algorithm and the processing delay are greatly increased, which is even unacceptable. Fo...

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Problems solved by technology

[0004] Of course, the increase in granularity will sacrifice part of the performance of the system, because the diversity characteristics of the channel cannot be fully utilized. Considering the diversity of wireless channels, this single fixed resource block allocation scheme cannot be well adapted to various environments.

The main manifestations are: on the one hand, the performance loss of the system is too much in a relatively harsh environment. Taking the currently opened high-speed rail at a speed of 350 kilometers as an example, if a 2GHz carrier frequency is selected, the calculated maximum Doppler frequency shift is as high as 648Hz ! With such a high Doppler frequency shift, the performance loss caused by resource blocks may be unacceptable; on the other hand, in indoor environments, where Doppler frequency shift and multipath delay are small, resource blocks There is room for further enlargement

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