Time division long term evolution (TD-LTE) system uplink power control method based on insulation degree

Abstract

The invention provides a time division long term evolution (TD-LTE) system uplink power control method based on insulation degree. The TD-LTE system uplink power control method is suitable for a scene where a TD-LTE system and a television system coexist, and includes the steps of setting an initial adjacent channel interference ratio (ACIR), and enabling each TD-LTE time division long term evolution user equipment (TD-LTE UE) to set a target signal noise ratio according to the insulation degree of each TD-LTE UE, determining the proportion of path loss and the ACIR through parameter proportion parameters on the premise that the interference of the TD-LTE UE to a television receiver is lower than a threshold, aiming at maximizing data rate sum of the TD-LTE UE and the television receiver to build a power control optimized model using the proportion parameters as optimized function is structured, and solving the power control optimized model and calculating the interference of the TD-LTE UE to the television receiver; and if the interference of the TD-LTE UE to the television receiver is smaller than the threshold, the power control algorithm can be completed, or the ACIR can be adjusted to repeat the steps. The power control method ensures that the the interference of the TD-LTE UE to the television receiver is within an acceptable range, ensures normal work of the television system, and at the same time, improves spectrum effectiveness of the TD-LTE system and the television system.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to time division long term evolution system (TD-LTE, Time Division Long Term Evolution) power control and cognitive radio frequency spectrum sharing technology. Background technique [0002] With the rapid development of wireless communication services, spectrum resources are increasingly scarce. How to make full use of existing spectrum resources and improve spectrum utilization has become a hot issue that people pay attention to. Due to the conversion of analog TV to digital TV, some frequency bands located in the UHF part are free, called TV White Space (TVWS, TV White Space), and we can use TVWS through cognitive radio (CR, Cognitive radio) technology. CR technology is a new type of intelligent spectrum sharing technology that can actively detect and opportunistically utilize spectrum holes in licensed frequency bands (the spectrum holes are idle spectrum that h...

AI Technical Summary

Problems solved by technology

In the scenario of the present invention, the television receiver in the television system is used as an authorized user, and the user (UE, user equipment) in the TD-LTE system is a cognitive user. As a cognitive user, the spectrum of the authorized user must first be guaranteed for Authorized users do not cause interference. In response to this problem, many studies have avoided interference by setting additional isolation, that is, increasing the guard frequency band or guard distance. However, such settings will reduce the available spectrum resources and reduce spectrum utilization.

[0004] For the TD-LTE system, the present invention utilizes the uplink power control to avoid the signal transmitted by the TD-LTE UE from interfering with the television system. The existing method for TD-LTE uplink power control does not consider the interference and isolation between the two systems. Therefore, it is not suitable for the scenario where TD-LTE and TV system coexist

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