Long-distance access method based on LTE wireless communication technology

Abstract

The invention belongs to the technical field of LTE wireless communication, and particularly relates to a long-distance access method based on an LTE wireless communication technology. The method comprises the following steps: 1, storing LTE base station position information and community information in a terminal; 2, calculating a spatial linear distance between the terminal and the LTE base station by using the obtained information through the terminal; and 3, calculating the round-trip delay time by utilizing the space linear distance, and then calculating the timing advance value. An ultra-long-distance LTE community coverage and access process is realized, and an LTE system can obtain a maximum coverage effect with low time-frequency resource overhead.

Description

technical field [0001] The invention belongs to the technical field of LTE wireless communication, and in particular relates to a long-distance access method based on the LTE wireless communication technology. Background technique [0002] LTE (Long Term Evolution) wireless communication technology, because of its high data transmission rate and high spectrum efficiency, has been widely deployed around the world and applied in various fields and scenarios. Some fields of LTE application, such as ground-to-air communication, that is, the communication between the ground base station and the air plane, have higher requirements for the terminal access distance, such as requiring the aircraft to still be able to access the base station at 130KM or even farther away. This is difficult for conventional LTE base stations and terminals to achieve. Table 1 shows the preamble format and supported cell radius of each PRACH (Physical Random Access Channel) of LTE under the 3GPP specific...

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Problems solved by technology

This method can indeed improve cell coverage in some application scenarios, but it also has obvious shortcomings. The proposed distance calculation from the base station to the terminal is carried out through two-dimensional coordinate information (x1, y1) and (x2, y2) , does not consider the influence of height on distance, which is not applicable to scenarios such as ground-to-air communication; secondly, its calculation of distance is accurate to 16Ts, and there is no protection amount set. For scenarios where base stations or terminals move at high speed, PRACH preamble detection will cause symbol truncation problem, also does not apply

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